PSE key.3
Keynote Presentation Understanding Weather & Climate Processes

PSE key.3

Keynote Presentation Understanding Weather & Climate Processes
Co-organized by UP
| Tue, 07 Sep, 16:00–16:30 (CEST)
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Julia Schmale is assistant professor at École Polytechnique fédérale de Lausanne, Switzerland, where she heads the Extreme Environments Research Laboratory (EERL) since 2019. Her research focuses on how the ocean, land, cryosphere and human activities influence the chemical and microphysical composition of the atmosphere, and the resulting effects on climate and air quality. The main study regions are the Arctic, Antarctica, Southern Ocean and high altitudes, where she deploys aerosol and trace gas instrumentation on aircraft, research vessels, ground-based observatories and tethered balloons. Prior to founding the EERL, Julia was part of the Laboratory of Atmospheric Chemistry at the Paul Scherrer Institute, Switzerland, where she started as a postdoc and then headed the molecular cluster and particle processes research group.
Throughout her career, Julia has been engaged in science-policy interaction, a direction she pursued in particular as scientist at the Institute for Advanced Sustainability Studies, Germany, after having obtained her PhD from the Max Planck Institute for Chemistry, Mainz, Germany. Currently Julia represents Switzerland in the international steering group of the MOSAiC expedition, the Atmosphere Working Group of the International Arctic Science Committee, and she is a lead author on the forthcoming report by the Arctic Monitoring and Assessment Programme’s expert group on short-lived climate forcers.

Julia Schmale will give the Keynote Presentation of the Programme Stream Understanding Weather & Climate Processes:

Measurements of Atmospheric Variability during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) Expedition

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Presentations: Tue, 7 Sep

Chairpersons: Frank Beyrich, Barbara Chimani
KEYNOTE PRESENTATION Understanding Weather & Climate Processes
Julia Schmale and the MOSAiC ATMOS Team

The MOSAiC expedition was designed to better understand the local and remote processes influencing the Arctic climate system. The Arctic is warming two to three times faster than the global average, a process known as Arctic amplification. One of the most significant consequences is the retreat of sea ice, which has already diminished by roughly 40 % since satellite measurements began. The Arctic atmospheric, marine and terrestrial changes have important effects on local processes, such as moisture sources, cloud formation, radiative and energy transfer, amongst other. They also have the potential to induce changes to large-scale circulation, which can impact the mid-latitudes of Eurasia and North America.    

Between September 2019 and October 2020 the MOSAiC expedition performed a large number of atmospheric measurements in the high Arctic, drifting most of the time with the sea ice. Instrumentation was operated from the icebreaker Polarstern (Alfred Wegener Institute), on the sea ice and on flying platforms. Observations covered generally: (i) the atmospheric physical structure (e.g., temperature, humidity, wind speed and direction profiles) with radio soundings, ground-based remote sensing, as well as towers; (ii) clouds and precipitation with a host of lidars, radars and radiometers, as well as distrometers and specific hydrometeor observations; (iii) aerosols and trace gases with real-time measurements as well as offline techniques for chemical and microphysical properties; and (iv) the surface energy budget with measurements of radiation, turbulent fluxes and conductive fluxes.  

The year-round measurements allow for the study of atmospheric variability during the annual cycle with the important processes of sea ice freeze-up and melting. Other event-based features, such as warm air mass intrusions, cyclones, storms, and lead opening, were studied in detail to understand the implications of these processes for the Arctic system. MOSAiC observations are in addition contributing to the evaluation of satellite-based observations such as radiation fluxes or cloud properties, as well as to the evaluation and improvement of numerical simulations, ranging from simpler box to complex Earth System Models.  

This presentation will provide an overview of the first atmospheric observational results during MOSAiC.

How to cite: Schmale, J. and the MOSAiC ATMOS Team: Measurements of Atmospheric Variability during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) Expedition, EMS Annual Meeting 2021, online, 6–10 Sep 2021, EMS2021-37,, 2021.

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