Atmospheric Circulation (Schemm)

Overview and News

Enlarged view: Atmospheric Circulation Group
High-resolution global climate simulation with ICON and two two-way nests over the Gulf Stream. Shown is the wind speed at the 300 hPa level.

 The Atmospheric Circulation group, led by Prof. Sebastian Schemm, has its research focus on weather and climate dynamics, high-resolution atmospheric modeling. This is done by modeling at different complexity, the use of observations, machine learning techniques and theory and the development of diagnostic tools in particular online diagnostics for high-resolution weather and climate models. More details can be found on the research page.

News

Activities:

Other news

 

New publications from the group

  • Weather and Climate Dynamics: For the North Atlantic storm track, Coupled Model Intercomparison Project (CMIP) data indicate a tripole pattern of change under the RCP8.5 scenario. In this study, we reproduce the patterns by introducing local asymmetry in a zonally symmetric ICON aquaplanet simulation and examine the response of storm tracks to global warming downstream of the SST asymmetry. We find that regionally baroclinic conversion has the largest impact, while diabatic processes are of first order importance on the global scale. The lifetime of cyclones is decreasing and so are their numbers, but the most intense cyclones are becoming more intense. The study appears in external pageEGU's Weather and Climate Dynamics. [May 2022]

  • [Featured Article] Cloud-circulation interactions: Clouds are not passively moved in the atmosphere by the wind. Instead, clouds actively influence the flow field in their immediate vicinity. In this study, the flow field generated by clouds is quantified. It is shown that clouds create a flow that is directed against the direction of the wind in which they grow. Hence, clouds propagate more slowly than a passive object, and they are more stationary. This can influence the regional cloud and precipitation distribution. In this article external pagepublished in the Quarterly Journal of the Royal Meteorological Society, we outline how to quantify the circulation influence of clouds.[February 2021] [external pageWiley Twitter]

 

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