Institut für Meteorologie und Klimaforschung

Seminar über Troposphärenforschung (IMK-TRO)

Ansprechpartner: PD Dr. M. Kunz,  Prof. Dr. C. Hoose, Prof. Dr. P. Knippertz, Prof. Dr. A. Fink , Prof. Dr. J. Pinto

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Donnerstag, 07. November 2024
15:00 - 17:30 
TRO-Seminar
CS, Geb. 30.23, 13. OG, Raum 13-02
(1)Viktoria Dürlich (2) Marco Wurth (3) Johannes Muschkeit(4) Andreas Baer, Chair: Hannah Meyer

(1) Investigating Arctic Multilayer Clouds with K-means Clustering (2) Simulating the size sorting of hydrometeors with P3 microphysics in a supercell case of the RELAMPAGO-CACTI campaign (3) Ein Experiment mit der senseBox zur Aufzeichnung von Wetterphänomenen für Physiklehramtskandidat:innen (4) Assessing the aerosol direct radiative effect - a radiation multiple call scheme implemented to ICON-ART

Freitag, 08. November 2024
15:45 - 16:45 
Puzzles in Historical Climate Trends: Insights into Walker Circulation and Tropical SST Pattern Changes
Kolloquium
Campus Süd, Otto-Lehmann-Hörsaal und online
Prof. Dr. Sarah Kang, Max-Planck-Institute for Meteorology, Hamburg

Global warming is known to weaken both the convective mass flux and the Walker circulation. Yet, in the past decades, the convective mass flux has been weakening while the Pacific Walker circulation has actually been strengthening. To investigate this discrepancy, we conducted a series of prescribed sea surface temperature (SST) experiments to separate the effects of global warming from changes in SST patterns. The tropical-mean convective mass flux weakens in proportion to global warming, largely unaffected by SST pattern changes. Conversely, the Walker circulation response is sensitive to SST pattern changes, weakening with global warming if zonal SST contrast decreases or increases below a certain threshold and strengthening if the increase in SST contrast exceeds that threshold. Thus, the Walker circulation might continue to strengthen if the SST pattern effects dominate. Our results indicate that the weakening of convective mass flux alone is insufficient for projecting the Walker circulation response.
 
Recognizing the impact of historical SST pattern changes, we further investigate potential mechanisms behind the changing the tropical Pacific SST pattern during the historical period. Recently, the tropical Pacific has been cooling, particularly in the eastern basin – a trend that coupled global climate models under historical forcing notoriously fail to capture. Our coupled model intercomparison study suggests that Southern Ocean surface cooling, another feature absent in historical simulations, has driven the eastern tropical Pacific cooling. This Southern Ocean-tropical Pacific connection appears in models only with sufficiently strong stratocumulus cloud feedback.
 

Dienstag, 12. November 2024
15:15 - 16:15 
From Cloud Turbulence to Aerosol-Cloud-Climate Interactions
Kolloquium
Raum 2.05, Gebäude 435, KIT Campus Nord und via ZOOM
Dr. Fabian Hoffmann, Ludwig Maximilian University Munich, Meteorological Institute

The turbulent mixing of clouds with their environment decreases cloud amount, and hence the ability of clouds to reflect solar radiation. Because the mixing increases with the droplet and hence aerosol concentration, this interaction is known to affect the role of clouds in the climate system, although its magnitude is hard to constrain. In this talk, I will review several mechanisms by which the droplet concentration affects the turbulent mixing of clouds and their environment, and discuss some associated problems. Ultimately, I will use ensembles of large-eddy simulations to derive a heuristic model by which the effect of aerosol-mediated mixing on clouds can be assessed. 

Dienstag, 19. November 2024
15:45 - 16:45 
tbd
Kolloquium
CS, Geb. 30.23, 13. OG, Raum 13-02
Prof. Dr. Yapin Shao, Universität zu Köln


Donnerstag, 21. November 2024
15:00 - 17:30 
TRO-Seminar
Seminar
CS, Geb. 30.23, 13. OG, Raum 13-02
(1) Lina Lucas (2) Alexander Lemburg (3) Nina Horat (4) tbd, Chair: Bastian Kirsch

(1) Convective storms in a changing climate (2) tbd (3) Analysis and correction of MJO related errors in subseasonal ECMWF ensemble forecasts (4) tbd
 

Donnerstag, 05. Dezember 2024
15:00 - 17:30 
TRO-Seminar
Seminar
CS, Geb, 30.23, 13. OG, Raum 13-02
(1) Ines Dillerup (2) Katharina Küpfer (3) Melina Sebisch 4) Hannah Meyer, Chair: Marie Hundhausen

(1) tbd (2) Serial clustering of multiple impact-related hazards in Germany (3) tbd (4) tbd

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