Arctic storm on 14-27 August 2022: (left column) satellite images (source: https://worldview.earthdata.nasa.gov) on (upper) 16 August and (lower) 25 August 2022. (Middle column) Sea ice fraction (shadings), sea level pressure (black contours; int : 5 hPa), 900-hPa winds (arrows for wind speed greater than 15 m /s). (Right Column) 850-hPa temperature (shadings; units: K), sea level pressure (black contours; int: 5 hPa). The S letter in green localizes Svalbard. Red lines labeled 46 and 53 correspond to flights of the Safire ATR42 aircraft on the respective days.
RALI-THINICE aims at investigating the dynamics of Arctic cyclones (ACs) and tropopause polar vortices (TPVs), as well as their interactions with cloud microphysics, the underlying sea surface and sea ice in particular. A better knowledge of such processes should improve Numerical Weather Predictions (NWPs) in the Arctic and should provide a better understanding of rapid sea ice loss events affecting the Arctic ice field in summer. The project relies on the comparison between NWP simulations, balloons and airborne observations made during an international field campaign in Svalbard in August 2022 involving American, French and British teams.
This field campaign involved two instrumented research aircraft:Different case studies are performed to compare simulations of different global and regional atmospheric models with the observations. It consist of simulating weather systems of interest, namely Arctic Cyclones, tropopause polar vortices and moist intrusions, that were observed during the future airborne field campaign in 2022. Different sets of cloud microphysical schemes are tested to analyze their effect on the distribution of hydrometeors in clouds. Their effect on atmospheric circulation is also analyzed through the link between heating rates and potential vorticity modification. Similarly, the sensitivity to various parameters of sea ice – atmosphere coupling system is tested to study the interactions between sea ice and Arctic Cyclones.
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The description of the THINICE field campaign has been published in La Météorologie. Citation : Rivière, G., Raillard, L., Delanoë, J., Bounissou, S., Caudoux, C., Cossalter, L., Huet, K., Cozzolino, C., Jourdan, O., Gourbeyre, C., Aubry, C., Bazile, E., Seity, Y., Douet, V., Trules, J., Doyle, J.D., Pantillon, F., Wimmer, M. (2022): Thinice: campagne de […]
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RALI-THINICE has a logo ! Do not hesitate to use it for your RALI-THINICE presentations ! The RALI-THINICE’s team thanks Martin Mounier for his help on the logo design and conceptualization.
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During the RALI-THINICE field campaign, 16 flights were performed by the French SAFIRE ATR42 to sample diverse areas of Arctic Cyclone such as warm front, warm sector, low-level jet, cyclone core, Warm Conveyor Belt, cold sector, Tropopause Polar Vortices, … Thus, a total of 61h30 of flight time has been realized.
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We are happy to announce the opening of our new website dedicated to RALI-THINICE. Let’s have a look ! In the forthcoming days, you will find all information about the project.