Clouds play an important role in the polar climate due to their interaction with atmospheric radiation and their role in the hydrological cycle linking poleward water vapour transport with precipitation, thereby affecting the mass balance of the polar ice sheets. Cloud-radiative feedbacks have also an important influence on sea ice. Cloud and precipitation properties depend strongly on the atmospheric dynamics and moisture sources and transport, as well as on aerosol particles, which can act as cloud condensation and ice nuclei.

This session aims at bringing together researchers using observational (in-situ, aircraft, ground-based, and satellite-based remote sensing) and/or modeling approaches (at various scales) to improve our understanding of polar tropospheric clouds, precipitation, and related mechanisms and impacts. Contributions are invited on various relevant processes including (but not limited to):
- Drivers of cloud/precipitation microphysics at high latitudes,
- Sources of cloud nuclei both at local and long range,
- Linkages of polar clouds/precipitation to the moisture sources and transport,
- Relationship of the poleward moisture transport to processes in the tropics and extra-tropics, including extreme transport events (e.g., atmospheric rivers, moisture intrusions),
- Relationship of moisture/cloud/precipitation processes to the atmospheric dynamics, ranging from synoptic and meso-scale processes to teleconnections and climate indices,
- Role of the surface-atmosphere interaction in terms of mass, energy, and cloud nuclei particles (evaporation, precipitation, albedo changes, cloud nuclei sources, etc)
- Effects that the clouds/precipitation in the Polar Regions have on the polar and global climate system, surface mass and energy balance, sea ice and ecosystems.

Papers including new methodologies specific to polar regions are encouraged, such as (i) improving polar cloud/precipitation parameterizations in atmospheric models, moisture transport events detection and attribution methods specifically in the high latitudes, and (ii) advancing observations of polar clouds and precipitation. We would like to emphasize collaborative observational and modeling activities, such as the Year of Polar Prediction (YOPP), Polar-CORDEX, the (AC)³ project on Arctic Amplification, SOCRATES and other campaigns over the Southern Ocean/Antarctica, and encourage related contributions.

The session is endorsed by the SCAR Antarctic Clouds and Aerosols Action Group.

Young scientist/student presentations are especially encouraged and we will reserve several oral units for such papers in this session.

Co-organized as CR3.06/HS11.16
Convener: Manfred Wendisch | Co-conveners: Susanne Crewell, Irina V. Gorodetskaya, Tom Lachlan-Cope, Nicole van Lipzig
| Fri, 12 Apr, 08:30–12:30
Room 0.31
| Attendance Fri, 12 Apr, 14:00–15:45
Hall X5

Friday, 12 April 2019 | Room 0.31

Chairperson: Manfred Wendisch, Nicole Van Lipzig
08:30–08:45 |
| Highlight
Felix Pithan, Gunilla Svensson, Rodrigo Caballero, Dmitry Chechin, Timothy Cronin, Annika Ekman, Roel Neggers, Matthew Shupe, Amy Solomon, Michael Tjernström, Manfred Wendisch, and Mubashshir Ali
08:45–09:00 |
Rosa Gierens, Kerstin Ebell, Stefan Kneifel, Tobias Marke, Tatiana Nomokonova, and Ulrich Löhnert
09:00–09:15 |
Vera Schemann, Kerstin Ebell, Mario Mech, and Roel Neggers
09:15–09:30 |
William Neff, Mathew Shupe, and Christopher Cox
09:30–09:45 |
Sandra Vázquez-Martín, Thomas Kuhn, and Salomon Eliasson
09:45–10:00 |
Constantino Listowski, Julien Delanoë, Amélie Kirchgaessner, Tom Lachlan-Cope, and John King
Coffee break
Chairperson: Susanne Crewell, Irina Gorodetskaya
10:45–11:00 |
| solicited
Julia Schmale, Andrea Baccarini, Linn Karsson, Patrick Duplessis, Matthew Salter, Julika Zinke, and Paul Zieger
11:00–11:15 |
Simon Alexander and Alain Protat
11:15–11:30 |
Markus Hartmann, Sebastian Zeppenfeld, Heike Wex, Anja Hünerbein, Conrad Jentzsch, Manuela van Pinxteren, Hartmut Herrmann, and Frank Stratmann
11:30–11:45 |
Oliver Eppers, Johannes Schneider, Franziska Köllner, Hans-Christian Clemen, Heiko Bozem, Stephan Mertes, Daniel Kunkel, Peter Hoor, and Stephan Borrmann
11:45–12:00 |
Marina Dütsch, Peter N. Blossey, Eric J. Steig, and Jesse M. Nusbaumer
12:00–12:15 |
Hannes Griesche, Patric Seifert, Ronny Engelmann, Johannes Bühl, Tatiana Nomokova, Kevin Ohneiser, and Albert Ansmann
12:15–12:30 |
Annakaisa von Lerber, Damao Zhang, Mario Mech, Annette Rinke, and Susanne Crewell
Poster session announcement