A11U:
Processes and Linkages in the Upper Troposphere and Lower Stratosphere: Observations and Models I

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Session ID#: 16354

Session Description:
The upper troposphere and lower stratosphere (UTLS) is an important region in the atmosphere with significant role in radiative forcing and climate. Despite the growing number of reliable observations and recent advances in the modeling of relevant processes (e.g., convection, cloud microphysical and radiative processes, reactive chemistry, tropical wave interactions), the mechanisms maintaining the composition and structure of the UTLS are still not well understood. This session will explore new developments regarding fundamental processes and linkages in the UTLS, as provided by observations, data assimilation and modeling. We encourage abstract submissions on a wide spectrum of UTLS topics including dynamical and chemical coupling with convection, transport pathways from the troposphere to the stratosphere, cirrus cloud impact and processes, evaluation of aircraft measurements, satellite retrievals and global models, halogen chemistry, and the role of UTLS water vapor in future climate.
Primary Convener:  Rei Ueyama, NASA Ames Research Center, Moffett Field, CA, United States
Conveners:  William John Randel1, Tao Wang2 and Marta Abalos1, (1)National Center for Atmospheric Research, Boulder, CO, United States(2)JPL/NASA/Caltech, Pasadena, CA, United States
Chairs:  Rei Ueyama, NASA Ames Research Center, Moffett Field, CA, United States and William John Randel, National Center for Atmospheric Research, Boulder, CO, United States
OSPA Liaison:  Tao Wang, JPL/NASA/Caltech, Pasadena, CA, United States
Index Terms:

0340 Middle atmosphere: composition and chemistry [ATMOSPHERIC COMPOSITION AND STRUCTURE]
0341 Middle atmosphere: constituent transport and chemistry [ATMOSPHERIC COMPOSITION AND STRUCTURE]
3362 Stratosphere/troposphere interactions [ATMOSPHERIC PROCESSES]

Abstracts Submitted to this Session:

Untangling the tropical tropopause layer with an idealized moist model: Tropical vs. extratropical control (Invited) (173366)
Edwin P Gerber, New York University, Courant Institute of Mathematical Sciences, New York, NY, United States and Martin Jucker, University of Melbourne, Parkville, VIC, Australia
Transport-radiation feedbacks in the tropical tropopause layer (189235)
Thomas Birner, CO State Univ-Atmospheric Sci, Fort Collins, CO, United States
Hemispheric Differences in Tropical Lower Stratospheric Transport and Tracers Annual Cycle (148252)
Olga Tweedy1, Darryn Waugh2, Richard S Stolarski1 and Luke Oman3, (1)Johns Hopkins University, Baltimore, MD, United States, (2)Johns Hopkins University, Earth and Planetary Sciences, Baltimore, MD, United States, (3)NASA Goddard Space Flight Center, Greenbelt, United States
Water Vapor in the Tropical Tropopause Region and Tropical Stratosphere from long term in situ observations (194682)
Holger Voemel1, Henry B Selkirk2, Gary A Morris3, Jorge Andres Diaz4, Ernesto Corrales5 and Jessica Valverde3,6, (1)National Center for Atmospheric Research, Boulder, United States, (2)Universities Space Research Association Greenbelt, Greenbelt, MD, United States, (3)Organization Not Listed, Washington, DC, United States, (4)University of Costa Rica, San Jose, Costa Rica, (5)Gas Lab, CICANUM, Universidad de Costa Rica, San Jose, Costa Rica, (6)Organization Not Listed, San Jose, Costa Rica
Impact of major sudden stratospheric warmings and the quasi-biennial oscillation on the variability of stratospheric water vapor (147176)
Mengchu Tao1, Paul Konopka2, Felix Ploeger1, Dale F Hurst3, Martin Riese1, Rolf Mueller1 and C Michael Volk4, (1)Forschungszentrum Jülich GmbH, IEK-7, Jülich 52428, Germany, (2)Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research(IEK-7): Stratosphere, Jülich, Germany, (3)Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States, (4)Bergische Univ. Wuppertal, Wuppertal, Germany
Convectively-driven cold layer and its influences on moisture in the UTLS (166169)
Joowan Kim, Kongju National University, Department of Atmospheric Sciences, Gongju, Korea, Republic of (South), William John Randel, National Center for Atmospheric Research, Boulder, CO, United States and Thomas Birner, CO State Univ-Atmospheric Sci, Fort Collins, CO, United States
The emergence of shallow easterly jets within QBO westerlies (183029)
Peter Hitchcock, University of Cambridge, Earth and Atmospheric Sciences, Cambridge, United Kingdom and Peter Haynes, University of Cambridge, Department of Applied Mathematics and Theoretical Physics, Cambridge, United Kingdom
The tropopause inversion layer at midlatitudes: Formation processes and relation to stratosphere-troposphere exchange (126069)
Daniel Kunkel1, Peter Michael Hoor1 and Volkmar Wirth2, (1)Johannes Gutenberg University of Mainz, Institute for Atmospheric Physics, Mainz, Germany, (2)Johannes Gutenberg University of Mainz, Mainz, Germany

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