News and Events
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 AOS Postdoc 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 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 AOS associate research scholar. 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.
AOS Program Biogeochemistry Seminar - March 14, 2014 at 2pm
Sayre Hall Conference Room
Presenter: Joe Majkut, AOS, Princeton
"Carbon cycle feedbacks and the social cost of carbon"
Work-Life and Professional Development Chat with Katja Fennel
Princeton Women in Geosciences (PWiGS) has organized a work-life and professional development chat with Dr. Katja Fennel from Dalhousie University. This event is open to all early career scientists from GEO and AOS.
Where: Campus Club Prospect Room (5 Prospect Ave)
When: Wednesday, April 9th, 6-7:30 PM
RSVP by Tuesday, 4/1/14
*This event is sponsored by The Graduate School, AOS Program, and GEO Department and organized by PWiGS.
Work-Life and Professional Development Chat with Diane McKnight
Princeton Women in Geosciences (PWiGS) has organized a work-life and professional development chat with Professor Diane McKnight from University of Colorado Boulder. This event is open to all early career scientists from GEO and AOS.
Where: Campus Club (5 Prospect Ave)
When: Tuesday, March 11th from 6:30 to 8:30PM.
RSVP by 3/6/14 via email to: <firstname.lastname@example.org>
*This event is sponsored by The Graduate School, AOS Program, and GEO Department and organized by PWiGS.
GFDL Research Oceanographer Charles Stock, who collaborates with the Sarmiento group, is the coauthor of a new study that uses climate projections from GFDL's ESM2.1 to force an individual-based model of North Atlantic Cod larvae at each of 5 cod spawning sites across the North Atlantic. The ESM-IBM coupling provides a unique means of exploring the mechanistic response of cod larvae to climate forcing. The study is published in Global Change Biology and can be found here.
GFDL Research Highlights
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 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
RSVP by 1/24/14
Persad Awarded AGU Outstanding Student Paper Award
AOS Graduate Student Geeta Persad was the recipient of an Outsanding Student Paper Award (OSPA), in the Atmospheric Sciences Section, by the American Geophysical Union (AGU) at the 2013 Fall meeting in San Francisco. Her presentation entitled, "The Role of Aerosol Absorption in Solar Dimming over East Asia and its Implications for Regional Climate" was one of only 15 papers chosen for this distinction in the Atmospheric Sciences Section.
In the News ... NOAA's Climate Program Office (CPO) Highlights Mao's Study -- Proposes Revised Mechanism for Isoprene Chemistry
A recent study led by 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
CANCELED! On Wednesday, December 11 from 6-8 pm at Campus Club (Prospect Room), PWiGS will be hosting a career chat and dinner with Dr. Colleen Hansel, from the Woods Hole Oceanographic Institution. The event is open to all graduate students, postdocs, research scholars, and technical staff in GEO and AOS. Men are welcome! RSVP by December 6 by completing this form.
New Study Reveals Carbon Dioxide Could Warm Earth for Centuries, Even if Emissions Stop
Even if carbon dioxide emissions came to a sudden halt, the carbon dioxide already in Earth's atmosphere could continue to warm our planet for hundreds of years, according to research led by first author and AOS collaborator Thomas Frolicher and published Nov. 24 in the journal Nature Climate Change. The study, co-authored by AOS Director Jorge Sarmiento and Mike Winton, a GFDL oceanographer, suggests that it might take a lot less carbon than previously thought to reach the global temperature scientists deem unsafe. Frolicher conducted the work as an AOS postdoc in
Sarmiento's group. full story
Though it makes up less than a third of the world's ocean coverage, the Southern Ocean surrounding Antarctica soaks up about half of the man-made carbon dioxide absorbed by the world's oceans from the atmosphere each year. Jorge Sarmiento, Bob Key and Daniel Sigman are among Princeton researchers pushing through the challenging conditions of the Southern Ocean because they want to learn more about the waters at the bottom of the globe. full story
'Tiger Stripes' underneath Antarctic Glaciers Slow the Flow
A new study led by AOS Associate Research Scientist Olga Sergienko 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
If a Tree Falls in Brazil…? Amazon Deforestation Could Mean Droughts for Western U.S.
In research meant to highlight how the destruction of the Amazon rainforest could affect climate elsewhere, Assistant Professor of Geosciences David Medvigy in collaboration with fellow Princeton University-led researchers report that the total deforestation of the Amazon may significantly reduce rain and snowfall in the western United States, resulting in water and food shortages, and a greater risk of forest fires. The study was published in the Journal of Climate and can be found here. full story
On Wednesday, November 20, at 4:30 pm, Michael Oppenheimer, professor of Geosciences and International Affairs and associated AOS faculty member, and AOS Faculty Member Gabriel Vecchi, will present a PIIRS Communicating Uncertainty Lecture entitled “Putting the New IPCC Report in Context.” The talk will be based on the recent report of the Intergovernmental Panel on Climate Change and will take place in Robertson Hall, Bowl 1. IPCC Summary
PWiGS Roundtable Discussion with Dr Jung-Eun Lee - Wednesday, November 13th
On Wednesday, November 13th from 4:30-5:30 pm in Guyot 154, a happy hour roundtable discussion with Dr. Jung-Eun Lee, Assistant Professor in the Department of Geological Sciences at Brown University, will be held on career and research development issues. Topics include, but are not limited to, strategies for research and career development, mentoring/skill development, grant writing/funding, and time management. All early-career scientists are welcome.
PWiGS Initiative Underway in AOS & GEO
The Princeton Women in Geosciences (PWiGS) initiative is presently underway in the AOS Program and Geosciences Department (GEO). The primary mission of the PWiGS initiative is to increase the retention and boost the morale of women in the Earth Sciences through the development of an active peer network and the fostering of mentorship. To learn more about the PWiGS initiative, visit their website.
Sarah Kapnick, an AOS postdoctoral research associate, has been awarded a NSF Atmospheric and Geospace Sciences Postdoctoral Research Fellowship for two years effective November 1. The principal aim of her research is to improve our understanding of hydroclimate variability. Much of her work focuses on understanding the mechanisms controlling precipitation and snowpack in complex orographic regions.
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
AOS Director Jorge Sarmiento discusses the mystery surrounding the Southern Ocean in a Trenton Times article published Friday, October 25, 2013. “Why the Southern Ocean?” Sarmiento explains the curiosity that drives his research. full story
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 AOS Faculty Member 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.
Congratulations to AOS Postdoctoral Research Fellow Greg DeSouza who has been awarded an Advanced Postdoc. Mobility postdoctoral fellowship, for one year beginning October 1, 2013, by the Swiss National Science Foundation (SNSF).
Recent Study Investigates the Role of Mesoscale Eddies in the Response of the Southern Ocean Carbon Sink to Wind Intensification
AOS Postdoc Carolina Dufour is the lead author of a recent study that takes a first step into quantifying the role of mesoscale eddies in the response of the Southern Ocean natural air-sea CO2 flux to the intensification of westerlies. This work, carried out during her PhD in France, aims at elucidating more generally the role of mesoscale eddies in driving the Southern Ocean circulation and carbon cycle, research that she can now pursue further at AOS using GFDL's high-resolution climate models. The article has been accepted for publication by Global Biogeochemical Cycles and is available here.
Michael Oppenheimer discusses Fifth Assessment Report Released by the IPCC on Global Warming
Michael Oppenheimer, geoscientist and AOS associated faculty member, discusses the Sept. 27th release of the latest report from the Intergovernmental Panel on climate Change. Titled "Climate Change 2013: The Physical Science Basis, the document is one of four parts of the Fifth Assessment Report from the IPCC. Los Angeles Times article
New research led by Malin PInsky, a former postdoctoral researcher in EEB and now an assistant professor of ecology and evolutionary biology at Rutgers, shows the first evidence that sea creatures consistently keep pace with "climate velocity," or the speed and direction in which changes such as ocean temperature move. Compiling 43 years of data related to the movement of 128 million animals from 360 species living around North America, including commercial staples such as lobster, shrimp and cod, the researchers found that 70 percent of shifts in animals' depth and 74 percent of changes in latitude correlated with regional-scale fluctuations in ocean temperature. AOS Director Jorge Sarmiento is coauthor of the study along with Professor of Ecology and Evolutionary Biology Simon Levin. Boris Worm, a biology professor at Dalhousie University in Canada, and Michael Fogarty, a chief researcher with NOAA's Northeast Fisheries Science Center in Woods Hole, Mass. also coauthored the study. The paper, "Marine Taxa Track Local Climate Velocities," was published Sept.13 by Science and can be found here.
AOS Graduate Student/Postdoc Retreat - Fall 2013
On Friday, September 13, 2013 AOS graduate students, postdocs, and faculty gathered for a one-day retreat at Mountain Lakes House in Princeton. This was the second annual retreat organized by AOS students and faculty to promote scientific and social interactions among the AOS community and to welcome incoming students. Photo Album
The AOS Program extends a warm welcome to its newest members -- Graduate Students Anna FitzMaurice, Youmi Oh, and Zhaoyi Shen!
Recent Study Shows the Important Role of Biosphere in Modulating Global Nitrogen Cycling
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.
Congratulations to AOS Graduate Student Geeta Persad who has been selected as the chair of the next Gordon Research Seminar in Radiation and Climate for 2015. The seminar, a two-day early career scientist symposium preceding the Gordon Research Conference (GRC), is an opportunity for graduate students, postdocs, and other scientists with comparable levels of experience and education to come together to discuss their current research and build informal peer networks. Geeta was selected based on her level of discussion participation in the 2013 and 2011 Gordon conferences and the merit of her scientific contributions to the conferences.
Click here to view the AOS Events Calendar.
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 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.