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This session invites contributions to discuss the present meteorological conditions in the Polar Regions (Arctic and Antarctic) and changes of these induced by climatic drivers.
Since 1980, near-surface climate warming in the Arctic has proceeded at approximately twice the global rate. Simultaneously with the warming, the Arctic has experienced notable changes such as decrease in sea ice extent and thickness and glacier retreat. These changes have been accompanied by changes in precipitation and in the large‐scale atmospheric circulation patterns.
The Polar atmosphere has very specific features such as shallow boundary layers, stratified conditions with low mixing and extreme insolation characteristics during large part of the year. These flow and turbulence patterns are important for exchange of heat, GHG and cloud condensation nuclei between the surface and the atmosphere, as well as for dispersion and mixing into higher elevation.
Changes in surface temperature and sea ice and glacier extent affect the atmospheric flow, turbulence and stratification, as well as snow properties, which in turn affects radiation processes and balance. In order to estimate future implications of climate change in the Polar Regions, it is important to understand the present meteorology as well as its development due to surface and temperature changes. This has to be achieved through combining measurements and modelling of local to regional scale meteorology. More specifically but not exclusively the session will address:
• Past and present Polar meteorological conditions
• Processes contributing to Polar amplification of climate warming
• Extremely shallow and stratified boundary-layers,
• Physics and occurrence of Arctic clouds, precipitation and haze
• Observations in Polar regions: challenges, experiences, networks and demand
• GHG concentrations development and GHG exchange with the cryosphere (e.g. permafrost thawing)
• Polar climate change trends and their local and remote impacts on different time scales
• Meso- and micro scale modelling for Polar predictions
• Long-range transport routes and emissions in Polar Regions
• Parameterization of specific processes for modelling the Polar atmosphere.
• Contribution to and support from international programmes: WMO Year of Polar Prediction, Arctic Monitoring and Assessment Programme, Sustaining Arctic Observing Networks, MOSAiC drifting station, International Arctic Systems for Observing the Atmosphere, Pan-Eurasian Experiment, etc.

Conveners: Lise Lotte Sørensen, Timo Vihma | Co-Conveners: Sven-Erik Gryning, Ruth Mottram
| Tue, 10 Sep, 11:00–16:00|Glass Hall
| Attendance Tue, 10 Sep, 16:30–18:30 | Display Mon, 09 Sep, 09:30–Wed, 11 Sep, 12:30|Sports Hall

Tuesday, 10 September 2019 | Glass Hall

Chairperson: 16917
Large-scale circulation
Chairperson: 16917
11:00–11:15 |
Erica Madonna, Camille Li, Clio Michel, and Lukas Papritz
Chairperson: 16917
11:15–11:30 |
Paolo Ruggieri, Carmen Alvarez-Castro, Alessio Bellucci, Panos Athanasiadis, Stefano Materia, and Silvio Gualdi
Chairperson: 16917
11:30–11:45 |
Timo Vihma, Edward Hanna, Xiangdong Zhang, James Overland, Irene Suomi, and Alexey Karpechko
Chairperson: 16917
Chairperson: 16917
12:00–12:15 |
Sonja Murto, Rodrigo Caballero, and Gunilla Svensson
Chairperson: 16917
12:15–12:30 |
Linus Magnusson, Jonathan Day, Irina Sandu, Mark Rodwell, Heather Lawrence, Niels Bormann, and Thomas Jung
Chairperson: 16917
Surface energy budget, boundary-layer and mesoscale processes
Chairperson: 16917
12:30–12:45 |
Dirk van As, Robert Fausto, Lillemor Claesson Liljedahl, Emma Johansson, and Ylva Sjöberg
Chairperson: 16917
12:45–13:00 |
Oskar Landgren, Rasmus A Pedersen, and Danijel Belušić
Lunch break
Chairperson: 16918
14:00–14:15 |
Sven-Erik Gryning, Christoph Münkel, Lise Lotte Sørensen, Henrik Skov, Rogier Floors, and Ekaterina Batchvarova
Chairperson: 16918
14:15–14:30 |
Irene Suomi, Timo Vihma, Christof Lüpkes, Jörg Hartmann, Tiina Nygård, and Teresa Valkonen
Chairperson: 16918
14:30–14:45 |
Andrey A. Grachev, Taneil Uttal, P. Ola G. Persson, Christopher W. Fairall, and Elena A. Akish
Chairperson: 16918
14:45–15:00 |
Large-eddy simulations of the turbulent flow around RV Polarstern: wake effects and implications for measurements during MOSAiC
Björn Maronga, Christof Lüpkes, and Joachim Reuder
Chairperson: 16918
Antarctic meteorology
Chairperson: 16918
15:00–15:15 |
Eric Bazile, Vincent Guidard, Niramson Azouz, Adrien Napoly, and Christophe Genthon
Chairperson: 16918
15:15–15:30 |
Igor Petenko, Giampietro Casasanta, Christophe Genthon3 Genthon, Margarita Kallistratova, Angelo Viola Viola, Alessandro Conidi Conidi, Roberto Sozzi, and Stefania Argentini
Chairperson: 16918
15:30–15:45 |
Gabin Urbancic, Irene Suomi, and Timo Vihma
Chairperson: 16918

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