Events & News
Congratulations to Sam Potter who successfully defended his Ph.D. Thesis "Superrotation and tropical waves in idealized atmospheric models" on August 15, 2014.
The "Art of Science 2014" exhibit showcases 44 images of artistic merit created during the course of scientific research. More than 250 images were submitted by undergraduates, graduate students, faculty, postdocs, staff and alumni representing over 25 departments. This year, for the first time in its seven-year history, the competition also includes video. Twelve videos were chosen from more than 50 submissions. Check out AOS Associate Research Scholar Martin Jucker's Fly Me video (best seen wtih blue-red 3D glasses) in the video gallery. Art of Science 2014 was co-sponsored by the Cooperative Institute for Climate Science (CICS). Related article
A new study coauthored by CICS Investigator David Medvigy, an AOS faculty member, explains the environmental factors that cause the leaves to change color in autumn. Variations in the timing of leaf coloring throughout the U.S., why the leaves of different species change color at different times, and how the timing of leaf coloring will change over the next 100 years are discussed. The lead author of the paper is Su Jong-Jeong, a former CICS scientist and AOS postdoctoral associate presently at NASA/Jet Propulsion Laboratory. The paper, titled "Macroscale prediction of autumn leaf coloration throughout the continental United States," was recently published online in Global Ecology and Biography and can be found here.
In the News ... CICS Investigator Eric Wood Mapping Water Trends for African Maize
To understand how climate change may affect the availability of water for agriculture, a new study coauthored by Eric Wood, a CICS investigator and the study's senior author, analyzed trends in the water cycle in maize-growing areas of 21 African countries between 1979 and 2010. The analysis was published in the July issue of the journal Environmental Research Letters and can be found here.
CICS Associated Faculty Member Simon Levin, the George M. Moffett Professor of Biology at Princeton University, was elected Foreign Member of the Lombard Institute Academy of Science and Letters.
A new study led by CICS Scientist Spencer Hill, an AOS graduate student, uses a GFDL climate model to investigate how temperature changes caused by human-emitted greenhouse gases and aerosols affect how the atmosphere transports energy from the hot tropics to the cold poles. In so doing, he and his GFDL coauthors, AOS Faculty Members Yi Ming and Isaac Held, provide a simple physical explanation for the widely reported result that movements of tropical rainfall north or south are tightly linked to energy transports across the equator. The paper "Mechanisms of forced tropical meridional energy flux change" was recently published online in the Journal of Climate and can be accessed here.
AOS Graduate Student Joe Majkut is the lead author of a new study that reviews current estimates of the CO2 uptake in the Southern Ocean and projections of its response to climate change. The authors show, via an observational system simulation experiment, that float-based sampling provides a significant opportunity for measuring the mean fluxes and monitoring the mean uptake over decadal scales. AOS Associate Research Oceanographer Brendan Carter, AOS Collaborator Thomas Froelicher (ETH Zurich), Carolina Dufour, an AOS postdoctoral research associate, and CICS Scientist Keith Rodgers are coauthors on the study along with CICS Director Jorge Sarmiento. The paper, "An Observing System Simulation for Southern Ocean Carbon Dioxide Uptake" was partially supported by CICS and was published on June 2 in the Royal Society journal Philosophical Transactions of the Royal Society A. The study can be found here.
A recent paper, coauthored by CICS Scientists Sergey Malyshev and Elena Shevliakova, describes "LM3," a new model of terrestrial water, energy, and carbon, intended for use in global hydrologic analyses and as a component of earth-system and physical-climate models. The study, led by Chris Milly (U.S. Geological Survey and GFDL) was published on June 2 in the Journal of Hydrometeorology and can be found here.
GFDL Poster Expo Wednesday, July 16th
GFDL is hosting a Poster Expo on Wednesday, July 16 from 10am-1pm. The Expo is an opportunity for GFDL/AOS/CICS scientists to share their research with colleagues and current summer interns being hosted by GFDL/AOS/CICS. Posters are limited to 25; existing posters are acceptable. Register early, but no later than 5pm on Monday, June 16.
CICS Scientist Junyi Chai, an AOS Graduate Student, is the lead author of a recent study that provides a new estimate for eddy scale. The results of this study fill in the gap between studies that assume the Rossby deformation radius is a good estimate for the eddy scale and studies that assume an inverse energy cascade is relevant. Former CICS Associate Director Geoff Vallis (University of Exeter) coauthors the study. The study can be found here.
CICS scientists, joined by scientists from the AOS Program and GFDL, were among 25 scientists from fields ranging from astrophysics to oceanography to biogeochemistry to robotics who participated in the Young Women's Conference in Science, Technology, Engineering and Mathematics on Friday, March 21st in the Frick Chemistry Laboratory at Princeton University. An annual event launched in 2001, the conference introduces middle-school and high-school aged girls (in 7th though 10th grades) to women scientists and engineers and the wide breadth of careers available to them in these fields. Ivy Frenger (AOS), Sonya Legg (CICS), Todd Mooring (CICS), Allison Smith (CICS), Desiree Tommasi (GFDL), Marian Westley (GFDL), and Hannah Zanowski (CICS) spent the day with the girls in a variety of formats including, small-group presentations and hands-on demonstrations and activities. Almost 400 young women from 46 schools in New Jersey, New York and Pennsylvania attended the event.
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New Study Shows that Oceanic Lee-Waves Make an Impact on Large-Scale Circulation and Climate -- Indicating the Importance of Including this Process in Climate Models
Former CICS Scientist Angélique Melet, currently a postdoc at CNES/LEGOS in France, is the lead author of new paper that explores the combined effects of internal tide– and lee wave–driven mixing on the ocean state. This is the first time the effect of oceanic lee-waves has been parameterized in a climate model. The results show that lee-waves make an impact on the large-scale circulation and climate, indicating the importance of including this process in climate models. AOS Faculty Members Robert Hallberg, a GFDL oceanographer, and Sonya Legg, the Associate Director of CICS, are coauthors on the study, along with Maxim Nikurashin, a lecturer/research fellow at the Institute for Marine and Antarctic Studies, University of Tasmania and a former CICS scientist. The paper, "Sensitivity of the Ocean State to Lee Wave–Driven Mixing," is published in the March issue of the Journal of Physical Oceanography and can be found here.
Perspectives Piece Examines Seasonal Hurricane Predictions
Gabriel Vecchi, a lecturer in the Department of Geosciences and the AOS Program and a GFDL researcher, is the co-author of a Perspectives piece on seasonal hurricane predictions appearing in Science February 7. The piece discusses the current state and ways forward on seasonal hurricane prediction, including prediction verification, learning from failed predictions, and correctly describing and communicating uncertainty. The piece can be accessed here.
In a new study led by CICS Scientist & AOS Research Scholar Meiyun Lin, researchers found that since the mid-1990s, shifts in atmospheric circulation have caused Asian ozone pollution reaching Hawaii to be relatively low in spring but rise significantly in autumn. The findings, published online Jan. 26 in Nature Geosciences, indicate that variability in airflow patterns must be considered when attributing observed ozone changes to human-induced trends in precursor emissions. The study can be found here.
Princeton Journal Watch article
In the News ... NOAA's Climate Program Office (CPO) Highlights Mao's Study that Proposes Revised Mechanism for Isoprene Chemistry
A recent study led by CICS Scientist & AOS Associate Research Scholar Jingqiu Mao proposes a thoroughly revised mechanism for isoprene chemistry, which not only allows for a more accurate model simulation, but fundamentally improves our understanding of atmospheric chemistry. The study can be found here. CPO highlights
'Tiger Stripes' underneath Antarctic Glaciers Slow the Flow
A new study led by CICS Scientist Olga Sergienko, an AOS Associate Research Scientist, in collaboration with researchers at the British Antarctic Survey has found that narrow stripes of dirt and rock beneath massive Antarctic glaciers create friction zones that slow the flow of ice toward the sea. Understanding how these high-friction regions form and subside could help researchers understand how the flow of these glaciers responds to a warming climate. The paper was published online by Science Nov. 7th and can be found here. full story
Drought Monitoring and Forecast System Developed to Monitor the African Water Cycle
CICS Scientist Eric Wood, a professor in CEE, and his research team have developed a drought monitoring and forecast system for sub-Saharan Africa. full story
Recent Study Specifies the Extent to which Plants have Prevented Climate Change Since Pre-industrial Times
A new study led by CICS Scientist Elena Sheliakova found that land ecosystems have kept the planet cooler by absorbing billions of tons of carbon, especially during the past 60 years. It is the first study to specify the extent to which plants have prevented climate change since pre-industrial times. The study was published October 15th in the Proceedings of the National Academy of Sciences and can be found here.
New Study Focuses on the Breaking of Low-mode Internal Waves at Sloping Topography
The breaking of low-mode internal waves at sloping topography is the focus of a new study by CICS Associate Director Sonya Legg. The study examines where internal waves break, relative to the topography, and where the mixing is distributed. According to Legg, the Internal Wave Driven Mixing Climate Process Team will use this information to improve their climate model ocean mixing parameterizations. The paper, "Scattering of low-mode internal waves at finite isolated topography," has been accepted by the Journal of Physical Oceanography and an early online release is available here.
A unique housing arrangement between a specific group of tree species and a carbo-loading bacteria may determine how well tropical forests can absorb carbon dioxide from the atmosphere, according to a Princeton University-based study partially supported by CICS. The findings suggest that the role of tropical forests in offsetting the atmospheric buildup of carbon from fossil fuels depends on tree diversity, particularly in forests recovering from exploitation. The paper, "Key role of symbiotic N2 fixation in tropical forest secondary succession," was published Sept. 15 in the journal Nature and can be found here.
Recent Study Shows the Important Role of Biosphere in Modulating Global Nitrogen Cycling
CICS Scientist and AOS Associate Research Scholar Jingqiu Mao is the lead author of a new study that presents a new isoprene oxidation mechanism for global models with extensive evaluations. With this validated mechanism, the authors show the importance of biosphere on nitrogen export from the U.S. and new insights into how biosphere changes the surface air quality over the eastern U.S. The article has been accepted for publication by the Journal of Geophysical Research - Atmospheres and is available here.
New CICS Associate Director Announced
Sonya Legg will be the new Associate Director of the Cooperative Institute for Climate Science (CICS-Princeton) effective September 2, 2013. Sonya brings tremendous talent and a deep commitment to the mission of CICS. She will be taking over from Geoff Vallis, who is leaving Princeton University to take on a faculty position at the University of Exeter in the College of Engineering, Mathematics and Physical Sciences starting October 1, 2013. Please join CICS Director Jorge Sarmiento in welcoming her to this key position.
Recent Study Investigates the Role of Anthropogenic Aerosols in the Earlier Onset of the Indian Monsoon in the Late 20th Century
CICS Scientist and AOS Research Scholar Massimo Bollasina is the lead author of a recent study that examines the impact of the late 20th century increase of anthropogenic aerosols on the onset of the Indian summer monsoon. The research team included Yi Ming, a lecturer in the Department of Geosciences and the AOS Program, and GFDL Director V. Ramaswamy. The article has been accepted for publication by Geophysical Research Letters and is available here. GFDL Research Highlights can be found here.
Study Demonstrates the Nonlinear Effect of Biomass Burning Strength on Radiative Forcing
A team of researchers led by CICS Scientist and AOS Associate Research Scholar Jingqiu Mao use a fully coupled chemistry-climate model (GFDL AM3) to demonstrate the nonlinear effect of biomass burning strength on radiative forcing in a recent study published in Geophysical Research Letters. At present-day emission levels, biomass burning produces atmospheric cooling, but increasing emissions to over 5 times present levels would result in warming. The study was published online on March 26, 2013. GFDL Research Highlights can be found here.
Congratulations to CICS Researcher and AOS Graduate Student Ilissa Ocko on her selection for the Emerging Alumni Scholars Award for 2012-2013. The Alumni Council's Committee on Academic Programs for Alumni (CAPA) selected Ilissa based on the excellence of her dissertation project, her ability to communicate in an engaging manner to a broad public outside of her discipline, and merits of her distinguished career at Princeton.
Our GFDL partners have released a new study that projects the doubling of heat-stress related labor capacity losses globally by 2050 with a warming climate. The study uses existing occupational health and safety thresholds to establish a new metric to quantify a healthy, acclimated individual's capacity to safely perform sustained labor under environmental heat stress. Coauthors of the study include GFDL Scientists John Dunne (lead author), Ronald Stouffer, and Jasmin John. The research was published online on February 24, 2012 in Nature Climate Change.
GFDL Research Highlights can be found here. NOAA Press Release
New Study Finds that Global Snowfall will Reduce, but Certain Regions will Receive More Snow under 2xCO2
AOS Postdoctoral Research Associate and CICS Scientist Sarah Kapnick is the lead author of a new study in the Journal of Climate that showcases the ability of the new high-resolution CM2.5 GFDL model for simulating snow variables. It examines the response of snowfall and snow covered area to a doubling of CO2 (translating to ~5F warming globally), finding that global snowfall reduces, but some special regions receive more snow.
GFDL Research Highlights can be found here.
Recent Study Discovers New Role of Aerosols
A team of researchers led by CICS Scientist and AOS Associate Research Scholar Jingqiu Mao has discovered a major and previously unrecognized role of aerosols in atmospheric oxidant chemistry. According to Mao,"This work solves a long-standing problem of underestimating air pollutants (carbon monoxide) transport to the Arctic in global chemistry models and also suggests a previously unrecognized positive radiative forcing of aerosols through the effects on the chemical budgets of major greenhouse gases including methane and hydrofluorocarbons (HFCs).” The paper, published on January 16 in Atmospheric Chemistry and Physics, can be found here.
Trees in the continental U.S. could send out new spring leaves up to 17 days earlier in the coming century than they did before global temperatures started to rise, according to a new study by CICS Researchers Su-Jong Jeong, David Medvigy, Elena Shevliakova, and Sergey Malyshev. The abstract can be found here.
AOS Research Scholar and CICS Scientist Yalin Fan coauthors letter warning of stronger wind and waves due to warming
An international team of climate researchers, including AOS Reserach Scholar and CICS Scientist Yalin Fan, has written and published an open letter in the journal Nature Climate Change, describing wind and wave pattern changes expected to come about due to global warming. The letter, published online January 13, can be found here.
Bollasina and coauthors honored by World Meteorological Organization
Congratulations to Massimo Bollasina, a CICS scientist and a postdoc in the AOS Program, and coauthors Yi Ming and V. "Ram" Ramaswamy on winning the World Meteorological Organization's Norbert Gerbier-MUMM International Award for 2013. Their paper, "Anthropogenic aerosols and the weakening of the South Asian Summer Monsoon" (published in the journal Science in September 2011) tied weaker South Asian summer monsoons to human activities.
Study Being Discussed EPA with Implications for the 2013 National Ambient Air Quality Standards for Ground-level Ozone
A recent study by a team of researchers led by CICS Scientist and AOS Associate Research Scholar Meiyun Lin is being actively discussed by the EPA with implications for the 2013 review of National Ambient Air Quality Standards for ground-level ozone. The paper was published in the Journal of Research – Atmospheres in mid-October.
CICS Receives $3 Million in Federal Funds to Enhance Climate Science, Education
The Cooperative Institute for Climate Science (CICS) recently received more than $3 million in new federal funding intended to support climate science and education. U.S. Senators Frank Lautenberg (D-N.J.) and Robert Menendez (D-N.J.) announced the new support Aug. 27 with the funding coming from the National Oceanic and Atmospheric Administration (NOAA). full story
Asian Emissions Contributing to Air Pollution in Western US
In a recent study published in the Journal of Geophysical Research - Atmospheres, a team of researchers led by CICS Scientist and AOS Associate Research Scholar Meiyun Lin found that the contribution of Asian emissions to intercontinental pollution is higher than was previously believed. full story Media coverage in Nature
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 Series.
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..
The AOS Program Biogeochemistry Seminar series is an informal seminar series that is held on Fridays at 2:00 p.m. in the Sayre Hall Conference Room. During the academic year, speakers from within the Program as well as visitors from the outside of the University give informal talks covering a broad range of topics relating to the ocean, atmosphere, and climate, with a particular emphasis on the global carbon cycle. The goal of the series is to allow research staff and visiting colleagues to present their work in an informal atmosphere where a free exchange of ideas can take place.
Click here for a complete list of AOS seminars.