text-only page produced automatically by Usablenet Assistive Skip all navigation and go to page content Skip top navigation and go to directorate navigation Skip top navigation and go to page navigation
National Science Foundation
design element
Search Awards
Recent Awards
Presidential and Honorary Awards
About Awards
Grant Policy Manual
Grant General Conditions
Cooperative Agreement Conditions
Special Conditions
Federal Demonstration Partnership
Policy Office Website

Award Abstract #1264195

Understanding the Response of the Austral Jet Stream to Changes in Greenhouse Gases and Stratospheric Ozone

Div Atmospheric & Geospace Sciences
divider line
Initial Amendment Date: April 4, 2013
divider line
Latest Amendment Date: April 4, 2013
divider line
Award Number: 1264195
divider line
Award Instrument: Standard Grant
divider line
Program Manager: Anjuli S. Bamzai
AGS Div Atmospheric & Geospace Sciences
GEO Directorate For Geosciences
divider line
Start Date: May 1, 2013
divider line
End Date: April 30, 2017 (Estimated)
divider line
Awarded Amount to Date: $506,695.00
divider line
Investigator(s): Edwin Gerber gerber@cims.nyu.edu (Principal Investigator)
divider line
Sponsor: New York University
NEW YORK, NY 10012-1019 (212)998-2121
divider line
divider line
Program Reference Code(s): 1303, EGCH
divider line
Program Element Code(s): 5740


The first goal of this research is to assess and attribute the response of the Southern Hemisphere jet stream to anthropogenic forcing in comprehensive climate models in the Coupled Model Intercomparison Project Phase 5 (CMIP5). The Principal Investigator (PI) suggests a simple method to partition the impact of ozone and greenhouse gas induced changes on the jet stream will be sugg. It will allow to better quantify uncertainty in climate projections, separating differences in the thermal response to greenhouse gases and ozone from differences in the sensitivity of the jet stream to changes in atmospheric temperature. Analysis of CMIP5 models to previous generation climate models from the Coupled Model Intercomparison Project Phase 3 (CMIP3) and Chemistry Climate Model Validation Activity 2 (CCMVal2) will be undertaken to assess the impact of model improvements on climate projection.

The second goal of this research is to understand the mechanism(s) causing changes in the jet stream, using a series of controlled experiments with an idealized general circulation model. Preliminary analysis of CMIP3 and CCMVal2 models suggests that the jet is sensitive to the temperature gradient in the upper troposphere and lower stratosphere, so that the response is similar when the tropics are warmed or the high latitudes are cooled. This hints at a common mechanism behind greenhouse gas and ozone induced changes. In addition, stratospheric ozone induced changes have a strong seasonal footprint. The PI will explore interactions between the background seasonal cycle in the stratosphere and troposphere with a seasonally localized ozone-like forcing. Observed trends in the midlatitude circulation of the atmosphere are stronger in the Southern Hemisphere summer than in other seasons (or in the Northern Hemisphere), due to the combined effect of greenhouse gases and ozone. This has had significant impacts on precipitation throughout the Southern Hemisphere, even the tropics. Thus this project will increase our understanding of how changes in model configuration, e.g. representation of the stratosphere, impact a model's response.

This research will involve a graduate student and postdoctoral scientist, providing opportunity for their development as a research scientists.


Note:  When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher. Some full text articles may not yet be available without a charge during the embargo (administrative interval).

Some links on this page may take you to non-federal websites. Their policies may differ from this site.

Cohen, N. Y., E. P. Gerber, and O. Bühler. "What drives the Brewer-Dobson Circulation?," J. Atmos. Sci., v.71, 2014, p. 3837. 

Li, X., E. P. Gerber, D. H. Holland, and C. Yoo. "A Rossby Wave Bridge from the Tropical Atlantic to West Antarctica," J. Climate, v.28, 2015, p. 2256. 

Li, X., D. H. Holland, E. P. Gerber, and C. Yoo. "Impacts of North and Tropical Atlantic Ocean on the Antarctic Peninsula and Sea Ice," Nature, v.505, 2014, p. 538-542. 

Gerber, E. P. and S.-W. Son. "Quantifying the Summertime Response of the Austral Jet Stream and Hadley Cell to Stratospheric Ozone and Greenhouse Gases," J. Climate, v.27, 2014, p. 5538. 

Zurita-Gotor, P., J. Blanco-Fuentes, and E. P. Gerber. "The impact of baroclinic eddy feedback on the persistence of jet variability in the two layer model.," J. Atmos. Sci.,, v.71, 2014, p. 410-429. 

Manzini, E. and 22 Coauthors including E. P. Gerber. "Northern winter climate change: Assessment of uncertainty in CMIP5 projections related to stratosphere ? troposphere coupling," J. Geophys. Res. Atmos., v.119, 2014. 

Li, X., D. H. Holland, E. P. Gerber and C. Yoo. "Rossby waves mediate impacts of tropical oceans on West Antarctic atmospheric circulation," J. Climate, v.28, 2016, p. 8151. 

Sheshadri, A., R. A. Plumb, and E. P. Gerber. "Seasonal variability of the polar stratospheric vortex in an idealized AGCM with varying tropospheric wave forcing," J. Atmos. Sci., v.72, 2015, p. 2248. 

Wenzel, S., V. Eyring, E. P. Gerber and A. Yu. Karpechko. "Constraining Future Austral Jet Stream Position and Shifts in the CMIP5 Ensemble by Process-oriented Multiple Diagnostic Regression," J. Climate, v.29, 2016, p. 673. 

Oberlaender-Hayn, S., E. P. Gerber, J. Abalichin, H. Akiyoshi, A. Kerschbaumer, A. Kubin, M. Kunze, U. Langematz, S. Meul, M. Michou, O. Morgenstern and L. D. Oman. "Is the Brewer-Dobson circulation increasing, or moving upward?," Geophys. Res. Lett., v.43, 2016. 


Please report errors in award information by writing to: awardsearch@nsf.gov.



Print this page
Back to Top of page
Research.gov  |  USA.gov  |  National Science Board  |  Recovery Act  |  Budget and Performance  |  Annual Financial Report
Web Policies and Important Links  |  Privacy  |  FOIA  |  NO FEAR Act  |  Inspector General  |  Webmaster Contact  |  Site Map
National Science Foundation Logo
The National Science Foundation, 4201 Wilson Boulevard, Arlington, Virginia 22230, USA
Tel: (703) 292-5111, FIRS: (800) 877-8339 | TDD: (800) 281-8749
  Text Only Version