AS2.3 | PICO

Changes in the Arctic and Antarctic climate systems are strongly related to processes in the boundary layer and their feedbacks with the free troposphere. An adequate understanding and quantification of these processes is necessary to improve predictions of future changes in the polar regions and their teleconnections with mid-latitude weather and climate, including meridional transport of heat, moisture and air pollutants. Processes include atmosphere-ocean-ice (AOI) interactions, such as physical and chemical snow processes (e.g. snow photochemistry), exchange of chemical constituents, sources of aerosol, polynya formation processes, sea ice production and bottom water formation, and cloud formation, which represent key processes for the atmosphere, ocean and the cryosphere. AOI interactions are also triggered by and have feedbacks with synoptic systems and mesoscale weather phenomena such as cold air outbreaks, katabatic winds and polar lows. Associated processes also include the effect of warm air advection and clouds on the surface energy budget and related boundary layer exchanges. Of increasing interest is the study of extremes such as heat waves and storms, but also extreme meridional transport events that can disturb the physical and chemical state of the high latitudes and may have a large impact on ecosystem changes. In addition, Arctic boundary-layer processes play an important role for local Arctic air pollution and for the health and ecosystem impacts thereof. In addition, understanding natural processes including AOI interactions is essential to understand of the background atmosphere to quantify the anthropogenic impacts. Shallow inversions, mostly during winter-time, lead to high air pollutant concentrations. Even though severe air pollution episodes are frequently observed in the Arctic, knowledge on urban emission sources and atmospheric chemical processing of pollution, especially under cold and dark conditions, are poorly understood.

This session is intended to provide an interdisciplinary forum to bring together researchers working in the area of boundary layer processes and high-latitude weather and climate (including snow physics, air/snow chemistry, and oceanography). Cryosphere and atmospheric chemistry processes (the focus of the IGAC/SOLAS activity “CATCH” and the IGAC/IASC activity “PACES”) are highly relevant to this session. We invite contributions e.g. in the following areas:

1. Observations and research on the energy balance, physical and chemical exchange processes, and atmosphere-ocean-ice (AOI) interactions including particle sources.
2. Results from high-elevation sites where similar processes occur over snow and ice.
3. Field programs, laboratory studies and observational studies (including remote sensing).
4. Model studies and reanalyses.
5. Advances in observing technology.
6. External controls on the boundary layer such as clouds, aerosols, radiation.
7. Teleconnections between the polar regions and mid-latitudes resulting in effects related to atmosphere-ice-ocean interactions as well as insights provided by monitoring of water vapor isotopes that shed light on air mass origins.
8. High-latitude urban air quality studies.

Co-organized as CR3.10/OS1.14
Convener: Günther Heinemann | Co-conveners: Jo Browse, Julia Schmale, Michael Tjernström, Gillian McCusker
| Thu, 11 Apr, 14:00–15:45
PICO spot 5a

Thursday, 11 April 2019

PICO spot 5a
Chairperson: Günther Heinemann and Julia Schmale
14:00–14:10 |
PICO5a.1 |
Joseph Sedlar and Michael Tjernström
Chairperson: Günther Heinemann and Julia Schmale
14:10–14:12 |
PICO5a.2 |
Andreas Preußer, Kay I. Ohshima, Sascha Willmes, and Günther Heinemann
Chairperson: Günther Heinemann and Julia Schmale
14:12–14:14 |
PICO5a.3 |
Antonios Dimitrelos, Annica Ekman, and Rodrigo Caballero
Chairperson: Günther Heinemann and Julia Schmale
14:14–14:16 |
PICO5a.4 |
Maurice Van Tiggelen, Paul Smeets, Carleen Tijm-Reijmer, and Michiel van den Broeke
Chairperson: Günther Heinemann and Julia Schmale
14:16–14:18 |
PICO5a.5 |
Christoph Thomas, Alexander Schulz, Tobias Linhardt, and Marion Maturilli
Chairperson: Günther Heinemann and Julia Schmale
14:18–14:20 |
PICO5a.6 |
Ian Brooks, Michael Tjernström, John Prytherch, Peggy Achtert, Jutta Vüllers, Ryan Neely III, Matthias Gottschalk, Ulrike Egerer, Manfred Wendisch, and Holger Siebert
Chairperson: Günther Heinemann and Julia Schmale
14:20–14:22 |
PICO5a.7 |
| presentation
John Prytherch, Michael Tjernström, Ian Brooks, Peggy Achtert, Ben Moat, and Margaret Yelland
Chairperson: Günther Heinemann and Julia Schmale
14:22–14:24 |
PICO5a.8 |
Clemens Drüe, Günther Heinemann, Alexander Makshtas, and Vasilii Kustov
Chairperson: Günther Heinemann and Julia Schmale
Chairperson: Günther Heinemann and Julia Schmale
14:26–14:28 |
PICO5a.10 |
Understanding and Modeling of Coupled Air-Ice-Ocean Interactions
Ola Persson, Amy Solomon, Matthew Shupe, Chris Cox, Gijs deBoer, Janet Intrieri, Madison Smith, Sharon Stammerjohn, Jim Thomson, and Michael Tjernström
Chairperson: Günther Heinemann and Julia Schmale
14:28–14:30 |
PICO5a.11 |
Kerstin Hartung, Gunilla Svensson, and Hamish Struthers
Chairperson: Günther Heinemann and Julia Schmale
Chairperson: Günther Heinemann and Julia Schmale
14:32–14:34 |
PICO5a.13 |
Ann-Lise Norman, Roya Ghahreman, Mark Derksen, Michelle Seguin, Ofelia Rempillo, Vivian Wasiuta, Shawn Marshall, and Martin Sharp
Chairperson: Günther Heinemann and Julia Schmale
14:34–14:36 |
PICO5a.14 |
Markus Frey, Holly Winton, Neil Brough, Jan-Marcus Nasse, Udo Friess, Joel Savarino, and Rolf Weller
Chairperson: Günther Heinemann and Julia Schmale
14:36–14:38 |
PICO5a.15 |
Iris Thurnherr, Franziska Aemisegger, Pascal Graf, Stephan Pfahl, Katharina Hartmuth, Maxi Böttcher, Josué Gehring, Alexis Berne, Yongbiao Weng, Harald Sodemann, Irina Gorodetskaya, and Heini Wernli