Session 1 Transport and Mixing in the Upper Troposphere and Stratosphere—Part I

Monday, 7 January 2019: 8:30 AM-10:00 AM
West 212A (Phoenix Convention Center - West and North Buildings)
Host: 20th Conference on Middle Atmosphere
Rei Ueyama, NASA, Ames Research Center, Moffett Field, CA and Eric A. Ray, CIRES, University of Colorado, Boulder, CO
Eric A. Ray, CIRES, University of Colorado, Boulder, CO and Rei Ueyama, NASA, Ames Research Center, Moffett Field, CA

Large-scale atmospheric transport and mixing play a key role in shaping the global distributions of chemical species and their responses to future climate change. In particular, transport and mixing of mass and chemical species (e.g., water vapor, ozone, aerosols) in the upper troposphere and stratosphere have important implications for stratospheric ozone chemistry, general atmospheric circulation, and surface climate. This session will highlight recent advances in our understanding of transport and mixing in the upper troposphere and stratosphere on a wide range of temporal and spatial scales, to better quantify the impacts of these processes on past, present, and future climate. Examples of relevant topics include the variability of and modulation by the Brewer–Dobson circulation and the quasi-biennial oscillation; stratosphere–troposphere exchange and its effects on stratospheric and tropospheric chemistry, isentropic exchange in tropopause folds, subtropical transport barriers, and the tropical pipe model; and the role of the Asian monsoon system in the upper troposphere and lower stratosphere region. Modeling, theoretical, and observational studies are all encouraged.

8:30 AM
8:45 AM
The Impact of Boreal Summer ENSO Events on Tropical Lower Stratospheric Ozone
Olga V. Tweedy, USRA/NASA Postdoctoral Program, Greenbelt, MD; and D. Waugh, W. J. Randel, M. Abalos, L. D. Oman, and D. E. Kinnison
9:00 AM
Future Changes in Stratospheric Ozone Intrusions
Jordan Benjamin, MIT, Cambridge, MA; and A. H. Butler and J. R. Albers
9:15 AM
Ozone Depleting Substances: Key Drivers of Past and Future BDC Trends
Marta Abalos, Univ. Complutense, Madrid, Spain; and L. Polvani and L. Wang
9:30 AM
Modeling Clouds and Water Vapor in the Upper Tropical Troposphere
Mark R. Schoeberl, Science and Technology Corporation, Columbia, MD; and D. Barahona, H. B. Selkirk, E. J. Jensen, R. Ueyama, L. Pfister, A. E. Dessler, T. Wang, and H. Ye

9:45 AM
Impact of Convectively Detrained Ice Crystals on the Tropical Upper Troposphere and Lower Stratosphere
Rei Ueyama, NASA, Moffett Field, CA; and E. J. Jensen, L. Pfister, and M. R. Schoeberl
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