News and Events
Check out the photos from the Winter 2016 Poster Expo, held on January 27, 2016.
AOS Program Biogeochemistry Seminar Friday, February 5th at 2pm -- Henri Drake (AOS), "The Lagrangian Deep Water Upwelling Pathways in the Southern Ocean" Sayre Hall Conference Room
AOS Program Biogeochemistry Seminar Friday, January 29 at 2pm -- Sarah Schlunegger (AOS), "Using Initial Condition Large Ensemble Experiments to Interpret Observed Trends and 21st Century Ocean Carbon Uptake" Sayre Hall Conference Room
Coming Soon: Winter 2016 Poster Expo
The Winter 2016 GFDL/AOS/CICS Poster Expo will be held on Wednesday, January 27, 2016 from 1pm-4pm in the Smagorinsky Seminar Room, GFDL. The Winter Expo is an opportunity for GFDL/AOS/CICS scientists to share their research with colleagues. To see the agenda and list of posters, visit the Poster Expo webpage.
Food for Thought: Building Confidence in Projections of the Reponses of Marine Resources to Climate Change
To improve our understanding of future changes in living marine resources (LMRs) and the resulting risk of impacts to ecosystems and societies under changing ocean conditions, the authors of a new study, published recently in the ICES Journal of Marine Science, synthesize knowledge of how to address different sources of uncertainty by drawing from climate model intercomparison efforts. The study was led by William Cheung (Nereus Program/UBC) and coauthored by Thomas Frolicher, a former AOS postdoctoral research fellow, AOS Postdoctoral Research Associate Rebecca Asch, Malin Pinsky, a visiting research collaborator (EEB), AOS Research Scholar Keith Rodgers, Ryan Rykaczewski, a former AOS associate research scholar, AOS Faculty Member Jorge Sarmiento, GFDL Research Oceanographer Charlie Stock, a former AOS associate research scholar, former AOS Postdoctoral Research Associate James Watson, et al.
AOS Program Biogeochemistry Seminar Friday, January 22 at 2pm -- Ken Andersen (Technical University of Denmark), "Trophic strategies of plankton" Sayre Hall Conference Room
Enhanced Warming of the Northwest Atlantic Ocean under Climate Change
Enhanced warming of the Northwest Atlantic Ocean under climate change is among the findings from a new paper, led by AOS Visiting Research Collaborator Vince Saba, published January 8 in the Journal of Geophysical Research. The CO2 doubling response from CM2.6 shows that upper-ocean temperature in the Northwest Atlantic Shelf warms at a rate nearly twice as fast as the coarser models and nearly three times faster than the global average. AOS Faculty Members Steve Griffies, Tom Delworth, Gabe Vecchi, and Rong Zhang are among the study's coauthors. GFDL Research Highlights Washington Post article Nature Climate Change Highlight
Researchers have discovered that competition for sunlight among rainforest trees leads to the remarkably consistent pattern of tree sizes seen in tropical forests around the globe. The finding, published January 8 in the journal Science and coauthored by AOS Associated Faculty Member Steve Pacala, Princeton’s Frederick D. Petrie Professor in Ecology and Evolutionary Biology, could help refine models of how rainforests absorb carbon dioxide and hold back rising global temperatures. Access the study here.
AOS Program Biogeochemistry Seminar Friday, January 15 at 2pm -- Alison Gray (AOS), "Observing the large-scale circulation with autonomous profiling floats: The wind-driven circulation and the Southern Ocean overturning circulation" Sayre Hall Conference Room" Sayre Hall Conference Room
Winter 2016 Poster Expo at GFDL: Registration Deadline Extended
GFDL is hosting a Poster Expo on Wednesday, January 27, 2016 from 1pm-4pm. The Winter Expo is an opportunity for GFDL/AOS/CICS scientists to share their research with colleagues. Posters are limited to 30; existing posters are acceptable. Register by 5pm on Friday, January 8.
Congratulations to He Wang who successfully defended his Ph.D. Thesis "Large Scale Impacts of Subarctic Channel Flows and Deep Water Formation in Climate Models" on January 5, 2016.
Modeling a Living Planet: A Symposium Celebrating the Research of Jorge L. Sarmiento
A two-day symposium marking the seventieth birthday of Jorge Sarmiento, the George J. Magee Professor of Geoscience and Geological Engineering and director of the Cooperative Institute for Climate Science (CICS), will be held March 14-15, 2016 in the Taylor Auditorium, Frick Lab. The symposium will cover interactions among the physical, geochemical, and biological aspects of the climate system. A set of invited talks will provide broad context for panel discussions and poster sessions. Registration is required and limited to 200 attendees. Registration will close on February 29, 2016.
Forty-two panels throughout Paris's Gare du Nord station honor AOS Senior Meteorologist Suki Manabe and his contributions to climate science. The equations chosen by British artist Liam Gillick come from the single-most cited paper of Manabe’s released 48 years ago and easily his most influential. The installation is called “The Logical Basis” and will remain until November 27, 2016. photos
Warm NIghts Could Flood the Atmosphere with Carbon under Climate Change
A study led by Princeton University researchers suggests that hotter nights may wield more influence than previously thought over the planet's atmosphere as global temperatures rise — and could eventually lead to more carbon flooding the atmosphere. Former and current AOS/CICS scientists Joe Majkut, Claudie Beaulieu, Jorge Sarmiento, and Elena Shevliakova are among the paper's coauthors.
Open Labs -- New Science Outreach Program at Princeton
Open Labs is a series of TED-like talks aimed at local high-school students interested in the sciences. Founded four years ago at Yale, this program has been highly successful and is now expanding to Princeton. The presenters consist of graduate and professional students devoted to encouraging promising young scholars to pursue careers in the sciences. You can find out more at goo.gl/irrkQ5. Contact email@example.com if you are interested in helping bring Open Labs to Princeton or would like to give a talk at the next Open Labs event.
A new paper, co-led by CICS Researcher Xin Zhang, a postdoctoral research associate in PEI, is among the first to globally analyze “nitrogen use efficiency” – a measure of the amount of nitrogen a plant takes in to grow versus what is left behind as pollution. Looking at fertilizer and crop harvest data in regions like the United States, Western Europe and Sub-Saharan Africa, the researchers examined how policies and market conditions have influenced farmers’ use of nitrogen fertilizers over the past five decades. Denise Mauzerall, an AOS associated faculty member and CICS PI, is among the paper's coauthors. The paper, "Managing nitrogen for sustainable development," was published online November 23 as a Perspectives piece in Nature.
SOCCOM Google Hangout: Climate Change and the Southern Ocean
Dec 3, 2015 · 11:30 a.m.–12:30 p.m.
This year wraps up with big climate and weather news – on international efforts in Paris to reach a global agreement on limiting emissions, about the strong El Nino in play in the Pacific Ocean, and with the acknowledgment that this year will be the hottest ever recorded. Join Climate Central's Heidi Cullen and SOCCOM scientists for a Google Hangout that explores the critical role the Southern Ocean plays as it relates to current events, and hear from some of the world’s leading climate scientists and educators as they reveal what new research gleaned from robotic floats tells us about the huge and important body of water that encircles Antarctica.
This spring, a new event will be held to celebrate the research and creative endeavors by Princeton University undergraduates, graduate students and postdoctoral researchers. Princeton Research Day will feature talks, posters, performances, art exhibitions and digital presentations from students and postdocs across the disciplines.The event will be held May 5, 2016 from 1 p.m. to 5 p.m. at Frist Campus Center. To learn more, visit the
Winter 2016 Poster Expo at GFDL
GFDL is hosting a Poster Expo on Wednesday, January 27, 2016 from 1pm-4pm. The Winter Expo is an opportunity for GFDL/AOS/CICS scientists to share their research with colleagues. Posters are limited to 30; existing posters are acceptable. Register early, but no later than 5pm on Wednesday, January 6.
New Study Provides Global Analysis of the Effect of Local Climate on the Hatchling Output of Leatherback Turtles
The most recent climate change projections show a global increase in temperatures along with precipitation changes throughout the 21st century. However, regional projections do not alwaysmatch global projections and species with global distributions may exhibit varying regional susceptibility to climate change. A study published recently in Scientific Reports - Nature, and coauthored by AOS Visiting Research Collaborator Vince Saba, shows the effect of local climatic conditions on the hatchling output of leatherback turtles (Dermochelys coriacea) at four nesting sites encompassing the Pacific, Atlantic and Indian Oceans
Anthropogenic Carbon and Heat Uptake by the Ocean: Will the Southern Ocean Remain a Major Sink?
An article in the 2015 Variations (a joint US CLIVAR & OCB newsletter) fall edition provides an overview of recent breakthroughs and ongoing work in understanding Southern Ocean heat and carbon uptake. The authors highlight remaining gaps and uncertainties, and discuss opportunities that will help address the challenges these present. The authors include Carolina Dufour, Ivy Frenger, Thomas Frölicher (ETH Zurich, formerly AOS), Alison Gray, Stephen Griffies (GFDL), Adele Morrison, Jorge Sarmiento, and Sarah Schlunegger.
AOS Program Biogeochemistry Seminar Friday, Nov. 20th at 2pm --
Seth Bushinsky (AOS) "Improved estimates of air-sea oxygen flux and biological carbon export through the use of self-calibrating Argo oxygen floats in the Pacific."
Climate, Drought, and National Security (video footage featuring Suki Manabe)
With historic 1988 BBC television footage featuring AOS Senior Scientist Syukuru “Suki” Manabe and recent news clips and interviews with MIT scientist Kerry Emanuel, Ohio State University scientist Lonnie Thompson, CNN reporter Christiane Amanpour, and New York Times columnist and book author Tom Friedman, a six-minute video plumbs the depths of growing climate change concerns among national security experts.
Nonlinear Zonal Wind Response to ENSO in the CMIP5 Models
A recent paper led by former AOS Graduate Student Kityan Choi and coauthored by AOS Faculty Member Gabriel Vecchi and Andrew Wittenberg, a physical scientist at GFDL, focuses on an atmospheric component of the nonlinearity or asymmetry of ENSO -- in particular, the equatorial Pacific zonal wind response to ENSO SST anomalies. The study was published in the November issue of the Journal of Climate.
A study led by former AOS Associate Research Scholar Greg de Souza finds evidence for large-scale biogeochemical connections between the northern and southern subpolar regions of the ocean. The paper, coauthored with Rick Slater and Jorge Sarmiento, can be found in the December 2015 issue of Earth and Planetary Science Letters . Combining isotopic observations with a suite of simulations using the GFDL/Princeton ocean model MOM3, the authors show that the unique signature of silicon stable isotopes in North Atlantic Deep Water, a water mass formed in the high-latitude North Atlantic that is important for the storage of anthropogenic carbon dioxide, owes its origin mainly to the cross-equatorial transport of silicic acid (a vital nutrient for diatoms, an important phytoplankton group) by mode and intermediate waters formed in the subpolar regions of the Southern Ocean. Coauthors also included Mathis Hain of the University of Southampton and Mark Brzezinski of the University of California, Santa Barbara.
Climate Computing: The State of Play
In a lead article for the Computing in Science Engineering (CISE) special issue on climate computing, AOS Senior Professional Specialist V. Balaji presents trends in climate science, driving models toward higher resolution, greater complexity, and larger ensembles, all of which present computing challenges.
AOS Program Biogeochemistry Seminar Friday, Nov. 13th at 2pm --
Lionel Arteaga (AOS) "Assessment of phytoplankton stoichiometry and primary production employing optimality-based growth models: Satellite and model-based analyses."
Scientists' Study Links Climate Change and Extreme Weather
(AOS Associate Research Scholar Hiroyuki Murakami Quoted)
A collection of studies examined extreme weather events last year, to look for signs that climate change was a cause or contributor. The papers are part of a broader effort to recognize the effects of climate change as the world warms.
The interplay of all the different kinds of warming going on in the Pacific at the moment can be difficult to sort out. AOS Faculty Member Gabriel Vecchi likened the challenge to the board game Clue: “There’s all these suspects, and we have them all in the room right now,” he said. “The key is to go and systematically figure out who was where and when, so we can exclude people or phenomena.”
Developing Country Finance in a Post-2020 Global Climate Agreement
When global leaders converge on Paris on Nov. 30 for the 2015 United Nations climate change conference, they should create guidelines and incentives for developing nations to cooperate with one another on lower-carbon energy projects, according to a paper led by Princeton University researchers, including the Wilson School's Michael Oppenheimer, an AOS Associated Faculty member. Failure to do so could contribute to an unchecked expansion of coal energy in developing counties, which has already accelerated in recent years with the help of Chinese firms going global.
In 2011, an influx of remote sensing data from satellites scanning the African savannas revealed a mystery: these rolling grasslands, with their heavy rainfalls and spells of drought, were home to significantly fewer trees than researchers had previously expected given the biome’s high annual precipitation. In fact, the 2011 study found that the more instances of heavy rainfall a savanna received, the fewer trees it had. This paradox may finally have a solution due to a new study coauthored by AOS Faculty Member David Medvigy and recently published in the Proceeding of the National Academy of Sciences. In the study, researchers use mathematical equations to show that physiological differences between trees and grasses are enough to explain the curious phenomenon.
U.S. Reaffirms its Commitment to SOCCOM
At Chile’s 2015 Our Ocean conference, the United States committed to a series of concrete actions to protect precious ocean areas and marine resources. The United States will invest over $21 million in the Southern Ocean Carbon and Climate Observations and Modeling project (SOCCOM), a robotic observing system collecting key data in the Southern Ocean to transform our understanding of its role in climate change. The Program is directed by CICS Director Jorge Sarmiento, an AOS faculty member.
Congratulations to Wenyu Zhou who successfully defended his Ph.D. Thesis "Non-Rotating and Rotating Radiative-Convective Equilibrium" on October 5, 2015.
Interview with AOS Graduate Student Geeta Persad
An interview AOS Graduate Student Geeta Persad did with Stanford University's Department of Geophysics has been featured in the AGU September Newsletter and is highlighted on the AGU Fall Meeting's first-time attendees page. Persad discusses how the AGU Fall Meeting influenced her academic career and led her to pursue climate science at Princeton. Interview
Many studies predict that future sea-level rise along the U.S. Atlantic and Gulf coasts will increase flooding. Others suggest that the human-caused warming driving this rise will also boost the intensity and frequency of big coastal storms. Up to now, though, these two hazards have been assessed mostly in isolation from each other. Now, a new study, coauthored by Gabe Vecchi, an AOS faculty member, quantifies how they could interact to produce alarming spikes in the combined height and duration of flooding. It projects that coastal flooding could possibly shoot up several hundredfold by 2100, from the Northeast to Texas. The study was published in the journal Nature Climate Change.
An Assessment of Phytoplankton Primary Productivity in the Arctic Ocean from Satellite Ocean Color/In Situ Chlorophyll-a Based Models
AOS Visiting Research Collaborator Vincent Saba, a research fishery biologist at NOAA National Marine Fisheries Service, is the coauthor of a recent study that investigates 32 phytoplankton primary productivity models by assessing their skill in the Arctic Ocean. The study suggests that ocean color primary productivity models need to be carefully tuned for the Arctic Ocean since most of the models performing relatively well were those that used Arctic-relevant parameters. The study was published in the Journal of Geophysical Research: Oceans.
2015 AOS Graduate Student Postdoc Retreat
Congratulations to Rob Nazarian, an AI (Assistant in Instruction) in GEO 425, for receiving the 2015 Arnold Guyot Graduate Student Teaching Prize, the first AOS student to receive the award. The prize is awarded for excellence in instruction and interactions with graduate students, contribution to course curricula and length of service of teaching a course in the Geosciences Department. The award was announced at the Geosciences picnic and comes with an honorary certificate and a monetary prize.
Sarmiento Comments on Southern Ocean's CO2-Scrubbing Performance
The possiblity that the Southern Ocean has undergone a turnaround in its CO2-scrubbing performance is interesting to George J. Magee Professor of Geoscience and Geological Engineering Jorge Sarmiento. He cautions, however, the data are "incredibly sparse in the Southern Ocean in time and space." SOCCOM is combining robotic float technology with high-resolution earth system modeling to expand our understanding of the workings of this remote ocean. Read More
Mark your Calendars ... On Tuesday, September 15th from 10am - 4:30 pm, AOS graduate students, postdocs, and faculty will gather for a one-day retreat at Mountain Lakes House in Princeton. This will be the fourth annual retreat organized by AOS students and faculty to promote scientific and social interactions among the AOS community and to welcome incoming students.
How to Curb Emissions? Put a Price on Carbon Now in the Policy Debate: Literally putting a price on carbon pollution and other greenhouse gasses is the best approach for nurturing the rapid growth of renewable energy and reducing emissions, according to a new policy article published in Nature. The authors – which include the Wilson School's Michael Oppenheimer, an AOS Associated Faculty member, – urge policymakers to implement a range of policies until the time that a carbon price becomes politically realistic.
Congratulations to Kit-Yan Choi who successfully defended her Ph.D. Thesis “El Niño-Southern Oscillation: Asymmetry, nonlinear atmospheric response and the role of mean climate on August 21, 2015.
On Warmer Earth, Most of Arctic may Remove, Not Add, Methane
Higher Arctic temperatures brought about by climate change could result in the release of massive amounts of carbon locked in the region’s frozen soil in the form of carbon dioxide and methane. New research coauthored by David Medvigy, an AOS faculty member, and published in The ISME Journal suggests that, thanks to methane-hungry bacteria, a majority of Arctic soil might be able to absorb methane from the atmosphere rather than release it.
FIshing, Fast Growth and Climate Variability Increase the Risk of Collapse
David Byler, a former summer intern, is the coauthor of a paper published recently in Proceedings B. The study originated from Byler's PEI internship project with Jorge Sarmiento's group during the summer of 2012. EEB Visiting Research Collaborator Malin Pinsky, an assistant professor of ecology and evolution in Rutger's School of Environmental and Biological Sciences, is the study's lead author. The study examines why some kinds of fish are more vulnerable to collapse, and finds that the patterns are opposite from those among animals on land. Pinsky's analysis relied on data from fisheries management agencies worldwide, and used mathematical analyses developed by Byler.
From Wednesday, August 5th through Friday, August 7th, AOS Program will be hosting the "Challenges in Using Current Atmospheric Models to Study Extreme Climate Scenarios" Workshop. Invited Speakers include: Natalie Burls (George Mason University), Matthew Huber (University of New Hampshire), and Robin Wordsworth (Harvard University). The workshop will take place in GFDL's Smagorinsky Room. All in the AOS/GFDL community are invited to attend. Please RSVP by Friday, July 31, 2015.
After Extreme Drought, Forests Take Years to Rebuild CO2 Storage Capacity
An analysis of drought impacts at forest sites worldwide found that living trees took an average of two to four years to resume normal growth rates — and thus carbon-dioxide absorption — after a drought ended, according to a Princeton-based study published this week in the journal Science. The research team included William Anderegg, a visiting associate research scholar in the Princeton Environmental Institute, and Princeton colleagues Steve Pacala, an AOS associated faculty member; Adam Wolf, an associate research scholar in ecology and evolutionary biology; and CICS Scientist Elena Shevliakova, a senior climate modeler in ecology and evolutionary biology and at GFDL.
Climate Change and Decadal Shifts in the Phenology of Larval Fishes in the California Currents
Climate change has prompted an earlier arrival of spring in numerous ecosystems. It is uncertain whether such changes are occurring in Eastern Boundary Current Upwelling ecosystems, because these regions are subject to natural decadal climate variability, and regional climate models predict seasonal delays in upwelling. To answer this question, a new study published in PNAS, by AOS Postdoctoral Research Associate Rebecca Asch, investigated the phenology of 43 species of larval fishes between 1951 and 2008 off southern California. Ordination of the fish community showed earlier phenological progression in more recent years, with faster changes than many terrestrial ecosystems.
A report entitled “Predicting Future Oceans: Climate Change, Oceans & Fisheries” newly released by the Nereus program, an international interdisciplinary research program aimed at predicting future oceans, suggests that future seafood supply in the world will be substantially altered by climate change, overfishing and habitat destruction if we do not take actions. The report notes that continued CO2 emissions are leading to changes in ocean temperature, acidity and oxygen levels that have been unprecedented over the last several thousands of years. These changes in ocean conditions will affect biological productivity in the ocean, impacting organisms ranging from plankton to fishes. An improved framework for global ocean governance will be needed to ensure sustainable fisheries in the future.
Baldwin Awarded 2015 PEI-STEP Environmental Policy Fellowship
AOS Graduate Student Jane Baldwin has been awarded a 2015 PEI-STEP Environmental Policy Fellowship by the Princeton Environmental Institute (PEI). Baldwin will join fellow 2015 Awardees Ryan Edwards from Civil and Environmental Engineering, Jack Hoang Lu from Chemical and Biological Engineering, and Andrew Tilman and Timothy Treuer from Ecology and Evolutionary Biology in addressing the environmental policy implications of their thesis research.
Congratulations to former AOS Postdoctoral Research Fellow Sarah Kapnick, a GFDL physical research scientist, who was recently awarded a Cryosphere Early Career Award from the American Geophysical Union (AGU). Sarah’s research focuses on the mechanisms controlling extreme storms and mountain snowpack
A Daily Global Mesoscale Ocean Eddy Dataset from Satellite Altimetry
Eddies play a significant role in the mixing and transport of heat, salt, and biogeochemical tracers across the global oceans,and eddies have been shown to influence near-surface winds, clouds, and rainfall within their vicinity as well as marine ecosystems. A new paper coauthored by AOS Postdoctoral Research Fellow Ivy Frenger presents a dataset of ocean mesoscale eddies detected and tracked globally based on daily sea level height anomaly observations over two decades. The dataset can be used to investigate ocean eddy characteristics and effects, and the software used to create the eddy dataset is published in a repository. The paper was published June 9 in Scientific Data.
The Southeast Atmosphere Studies Workshop will be held at GFDL (Smagorinsky Room) Monday to Wednesday (June 8-10). The workshop will focus on a few research topics over the Southeast US, including ozone photochemistry, the formation of organic aerosols, chemistry-climate interactions ("warming hole over eastern US" in particular) and anthropogenic/biogenic emissions. Agenda
Marine ecosystems are increasingly stressed by human-induced changes. Marine ecosystem drivers that contribute to stressing ecosystems – including warming, acidification, deoxygenation and perturbations to biological productivity– can co-occur in space and time, but detecting their trends is complicated by the presence of noise associated with natural variability in the climate system. A new paper led by AOS Research Scholar Keith Rodgers considers emergence characteristics for the four individual and combined drivers. The results underscore the importance of sustained multi-decadal observing systems for monitoring multiple ecosystem drivers. The study was recently published in Biogeosciences.
New Research will Help Forecast Bad Ozone Days over the Western U.S.
A new study led by AOS Associate Research Scholar Meiyun Lin uses observations and numerical simulations to demonstrate a strong connection between high ozone days in the western U.S. during late spring and La Niña, an ocean-atmosphere phenomenon that affects global weather patterns. This linkage is important for developing seasonal forecasts with a few months of lead time to aid in western U.S. air quality planning and for effective implementation of U.S. ozone standards. AOS Faculty Member Larry Horowitz is a coauthor of the study recently published in Nature Communications. GFDL Research Highlights
AOS Program Biogeochemistry Seminar Friday, May 29th at 10:30am -- Anand Gnanadesikan (Johns Hopkins), "Implications of the isopycnal mixing paradox for climate and biogeochemical cycling" Sayre Hall Conference Room
Ice Core Atmospheric Bubbles from a Million Years Ago give Climate Change Understanding
A team of researchers with members from Princeton University, the University of Maine and Oregon State University has found that greenhouse gasses a million years ago, were only slightly higher than they were between 450,000 and 800,000 years ago. In their paper published in Proceedings of the National Academy of Sciences, the team describes their study of the newly retrieved ice cores and how it is helping to better understand the changes to the Earth's ice ages. AOS Associated Faculty Member Michael Bender is a coauthor of the study.
Dissecting the Ocean's Unseen Waves to Learn Where the Heat, Energy and Nutrients Go
CICS Associate Director Sonya Legg, an AOS senior research oceanographer, and colleagues from collaborating institutions (including Maarten Buijsman, a former AOS postdoc and now an assistant professor of physical oceanography at the University of Southern Mississippi) created the first “cradle to grave” model of the world’s most powerful internal ocean waves. The study was published online April 29, 2015 in Nature.
Washington Post article
EOS Spotlight: Could Amazonian Deforestation Increase Cloudiness and Rain?
A recent AGU-EOS Research Spotlight highlights the work of AOS Graduate Student Jaya Khanna and David Medvigy, Assistant Professor of Geosciences. The researchers investigated the atmospheric effect of deforestation in Rondônia, a state in west central Brazil, using the recently developed Ocean-Land-Atmosphere Model. (Journal of Geophysical Research: Atmospheres, doi:10.1002/2014JD022278, 2014)
Water Forms Common Thread in Diverse Rainforest Ecosystems
A new study coauthored by AOS Faculty Member David Medvigy determined the minimum amount of rainfall needed to sustain rainforests. The researchers also found surprisingly large differences in the amount of water available to rainforests in different parts of the world. The study was published in Nature Geoscience.
EOS Spotlight by Eric Betz: Investigating Uncertainties in Tropical Climate Forecasts
Observation and numerical climate model prediction do not always match when it comes to atmospheric temperature trends in Earth's tropics. Some skeptics have focused on the mismatch, and the question of a systematic problem in the models has been raised. Recently, former AOS Senior Research Assistant Thomas Flannaghan, The Fueglistaler Group, and AOS Faculty Member Isaac Held et al. set out to find the source of the problem.
AOS Program Biogeochemistry Seminar Friday, May 1st at 3pm -- Desiree Tommasi (AOS), "Incorporating seasonal climate forecasts into a harvest guideline control rule for Pacific sardine" Sayre Hall Conference Room
Congratulations to Rebecca Asch, a postdoc in the Sarmiento Group, who was awarded the best early career scientist presentation for her talk titled "Projected Mismatches Between the Phenology of Phytoplankton Blooms and Fish Spawning Based on the GFDL Earth System Model (ESM2M)" at the Third International Symposium on the Effects of Climate Change on the World's Oceans. The conference took place in late March in Santos, Brazil.
New Study Examines Mechanisms for Low-Frequency Variability of Summer Arctic Sea Ice Extent
The observed decline in summer Arctic sea ice has often been attributed, in large part, to the increase in greenhouse gases. However, the contributions from internal low-frequency variability in the climate system are not well understood. In a new study by AOS Faculty Member Rong Zhang, a multiple regression model is developed for the first time, to the author’s knowledge, to quantify the contributions of three key predictors on the internal low-frequency variability of summer Arctic sea ice extent. The study was published in the Proceedings of the National Academy of Sciences (PNAS).
AOS Program Biogeochemistry Seminar Friday, April 24th at 10am -- Rebecca Asch (AOS), "How will climate change impact fish reproduction? Case Studies examining phenological mismatches in the North Atlantic and North Pacific and spawning aggregations in the Caribbean" Sayre Hall Conference Room
A symposium honoring 2015 Benjamin Franklin Medal Awardee Suki Manabe will be held on Monday, April 20th from 9:00 to 12:30 pm in the Friend Center. In this symposium, talks will examine advances that have been made in understanding climate change and the future challenges that remain in developing a predictive understanding of Earth's climate system. Program Schedule
AOS Program Biogeochemistry Seminar Friday, April 17th at 3pm -- Carolina Dufour (AOS), "Mechanisms governing the uptake of anthropogenic CO2 by the Southern Ocean: Preliminary results from climate models" Sayre Hall Conference Room
AOS Associate Resarch Scholars Fabien Paulot and Jingqiu Mao are coauthors of a new paper that has important implications for the prediction and management of future ozone air quality. The study uses observations and simulations to diagnose the sensitivity of August surface ozone to large-scale temperature variations in the southeast US during 1988–2011. The study was published in Nature Climate Change.
AOS Program Biogeochemistry Seminar Friday, April 10th at 3pm -- Alison Gray, "New observations from biogeochemical floats in the Southeast Pacific" Sayre Hall Conference Room
AOS Faculty Member Tom Delworth is the lead author of a new study that uses three GFDL climate models to study the mechanisms behind the hiatus in global warming over the last decade and their possible relationship to southwestern U.S. drought. This study suggests that a majority of the drought in the southwestern U.S. over the last decade is the result of persistent anomalous wind conditions in the tropical Pacific, and is likely due to natural variability. The study was published in the Journal of Climate. GFDL Research Highlights
Improved Seasonal Prediction of Temperature and Precipitation over Land in a High-resolution GFDL Climate Model
A recent study led by AOS Associate Research Scholar Liwei Jia demonstrates skillful seasonal prediction of near-surface air temperature and precipitation over land using a new high-resolution climate model developed at GFDL, called FLOR. The study further diagnoses the sources of the prediction skill. Skillful seasonal predictions of surface temperature and precipitation over land are needed because of their importance to ecosystems and sectors such as agriculture, energy, and transportation. The research was conducted while Jia was a UCAR and GFDL employee, and was published in the Journal of Climate. GFDL Research Highlights
AOS Program Biogeochemistry Seminar Friday, March 27th at 3pm -- Yavor Kostov (MIT), "Southern Ocean cooling in a warming world: Reassessing the role of westerly winds" Sayre Hall Conference Room
Are you interested in improving your ability to communicate your work to audiences outside of science? Are you curious about how to conduct effective public outreach? Students, postdocs, staff, and faculty, are invited to attend a hands-on science communication workshop, hosted by STEP, on Friday, March 27 in Robertson Hall.
Enrollment is limited; sign up here at your earliest convenience. Have questions? Email Rachel Licker at firstname.lastname@example.org
AOS Program Biogeochemistry Seminar Friday, March 13th at 3pm -- Anna FitzMaurice (AOS), "Investigating the Relationship Between Sea Ice and the Southern Ocean Overturning Circulation" Sayre Hall Conference Room
The Impact of MPOWIR: A Decade of Investing in Mentoring Women in Physical Oceanography
CICS Associate Director Sonya Legg, an AOS faculty member, is coauthor of a new article featured in a special issue of Oceanography "Women in Oceanography: A Decade Later." The article " The Impact of MPOWIR: A Decade of Investing in Mentoring Women in Physical Oceanography" describes the MPOWIR (Mentoring Physical Oceanography Women to Increase Retention) Program, a US community-initiated and community-led mentoring program aimed at improving the retention of women physical oceanographers in academic and/or research positions. It also describes MPOWIR's impact to date and outlines its future directions.
AOS Program Biogeochemistry Seminar Friday, March 6th at 3pm -- Philip Pika (ETH Zurich), "Determining ocean biomes and Chlorophyll content in a changing climate" Sayre Hall Conference Room
AOS Program Biogeochemistry Seminar Friday, Feb. 27th at 3pm -- Katsuya Toyama (AOS), "Lagrangian analysis of nutrient transport in the Southern Ocean" Sayre Hall Conference Room
New Study Uses GFDL Global Climate Models to Investigate Behavior of Brewer-Dobson Circulation
In a new study led by AOS Postdoctoral Research Associate Pu Lin, GFDL global climate models were used to investigate how the Brewer-Dobson circulation would vary in response to different natural and anthropogenic climate forcings. The authors calculate the strengths of the Brewer-Dobson circulation simulated by GFDL global climate models CM3 and CM2.1, and find that the strengths correlate with the tropical mean surface temperature. This correlation is also supported by observational-based analysis. Yi Ming, a lecturer in Department of Geosciences and the AOS Program, and GFDL Director V. Ramaswamy are coauthors of the study published in Geophysical Research Letters.
Representations of the Nordic Seas Overflows and their Large Scale Climate Impact in Coupled Models
He Wang, a graduate student in the AOS program, is the lead author of a new study published in Ocean Modelling that describes the sensitivity of the North Atlantic climate in GFDL models to the model representation of the Nordic Sea overflows (flows of dense water through gaps in the ridge between Greenland and Scotland). These flows are usually poorly captured in coarse resolution climate models. Wang and coauthors CICS Associate Director Sonya Legg and Robert Hallberg, an AOS faculty member, find that the Meridional overturning circulation, the direction of the warm North Atlantic Current and the temperature and salinity of the northernmost part of the Atlantic can all be affected. This is the first study to carefully compare old and new methods of capturing the overflows in climate models, and to show the importance of representing these flows accurately in order to correctly simulate the climate in the North Atlantic.
Diversity in Science: A Conversation - Wednesday, Feb. 25th 6 - 8 pm
EEB Women in Science Partnership & Princeton Women In Geosciences (PWiGs) invite all members of the AOS community (faculty, postdocs, graduate students, and research staff) to a gathering of GEO, AOS, and EEB to celebrate and discuss the value of diversity in science. The event features dinner (from Chipotle), a faculty panel featuring voices from our department, and group discussions. Be part of the conversation! RSVP by Feb.18th.
Energy Flux into Internal Lee Waves: Sensitivity to Future Climate Changes using Linear Theory and a Climate Model
A recent study led by former AOS Postdoctoral Research Associate Angelique Melet (LEGOS, France), in collaboration with former AOS Associate Research Scholar Max Nikurashin (University of Tasmania), examines how the energy transferred from geostrophic eddies to lee-waves (small-scale underwater waves over bumpy sea-floor topography), can change as climate changes, e.g. due to global warming. This lee-wave energy is important because it can drive mixing in the interior of the Southern Ocean. AOS Faculty Member Robert Hallberg, Alistair Adcroft (GFDL), and CICS Associate Director Sonya Legg, an AOS faculty member, are couathors of the study published in the Journal of Climate.
AOS Program Biogeochemistry Seminar Friday, Feb. 20th at 3pm -- Natasha Henschke (University of New South Wales), "Salp swarms in the Tasman Sea: Are there fisheries and climate implications?" Sayre Hall Conference Room
AOS Program Biogeochemistry Seminar Friday, Feb. 13th at 3pm -- Haidi Chen (University of Wisconsin), "Observed dominance of submesoscale fronts to primary production in the North Atlantic Subtropical Gyre" Sayre Hall Conference Room
AOS Postdoctoral Research Associate Adele Morrison is the lead author of a recent article outlining the mechanisms and impacts of upwelling in the Southern Ocean and the role of the SOCCOM Program in investigating it. AOS DIrector Jorge Sarmiento and Thomas Frölicher (ETH Zurich) are coauthors of the article published in Physics Today.
Study Investigates the Dynamics of Marine Populations at a Global Scale
Modeling the dynamics of marine populations at a global scale - from phytoplankton to fish - is necessary if scientists are to quantify how climate change and other broad-scale anthropogenic actions affect the supply of marine-based food. A recent study led by James Watson, while a postdoc in the AOS Program, investigates the dynamics of marine populations at a global scale using a simple size-based food web model coupled to simulations of global ocean physics and biogeochemistry. GFDL Scientist Charles Stock, an AOS collaborator, and AOS Director Jorge Sarmiento are coauthors of the study published in Progress in Oceanography.
Regular Weekly Seminars
Throughout the academic year, Geophysical Fluid Dynamics Laboratory (GFDL) hosts seminars every Wednesday at noon - 1:00 p.m. and every Thursday from 2:00 pm - 3:00 p.m. in the Smagorinsky Seminar Room. These events feature internal and external speakers who discuss their research on various aspects of atmosphere, ocean, weather and climate.
Click here for a complete list of GFDL seminars.
Geosciences hosts a number of events including their departmental lecture series on Tuesdays at 12:30 p.m., the Environmental Geology & Geochemistry Seminar (EGGS) Lecture Series on Thursdays at 12:30-1:30 p.m., and the Solid Earth Brown Bag Seminars on Friday at 12 noon in Guyot Hall Room 220. They also regularly host their Junior Colloquium .
Click here for a complete list of Geosciences events.
The David Bradford Seminars in Science, Technology and Environmental Policy, co-sponsored with the Princeton Environmental Institute, are a lunchtime seminar series held at Wallace Hall, Room 300 at noon - 1:00 p.m. Lunch is provided starting at 11:45 a.m.
Click here for a complete list of STEP seminars.