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Relative impact of aerosol, soil moisture, and orography perturbations on deep convection

Schneider, Linda; Barthlott, Christian; Hoose, Corinna; Barrett, Andrew I.

Abstract (englisch):
The predictability of deep moist convection depends on many factors, such as the synoptic-scale flow, the geographical region (i.e., the presence of mountains), and land surface–atmosphere as well as aerosol–cloud interactions. This study addresses all these factors by investigating the relative impact of orography, soil moisture, and aerosols on precipitation over Germany in different weather regimes. To this end, we conduct numerical sensitivity studies with the COnsortium for Small-sale MOdelling (COSMO) model at high spatial resolution (500 m grid spacing) for 6 days with weak and strong synoptic forcing. The numerical experiments consist of (i) successive smoothing of topographical features, (ii) systematic changes in the initial soil moisture fields (spatially homogeneous increase/decrease, horizontal uniform soil moisture, different realizations of dry/wet patches), and (iii) different assumptions about the ambient aerosol concentration (spatially homogeneous and heterogeneous fields). Our results show that the impact of these perturbations on precipitation is on average higher for weak than for strong synoptic forcing. Soil moisture and aerosols are each responsible for the maximum precipitation response for three of the cases, while the sensitivity to terrain forcing always shows the smallest spread. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000099020
Veröffentlicht am 16.10.2019
Originalveröffentlichung
DOI: 10.5194/acp-19-12343-2019
Coverbild
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000099020
HGF-Programm 12.01.01 (POF III, LK 01)
Erschienen in Atmospheric chemistry and physics
Band 19
Heft 19
Seiten 12343–12359
Vorab online veröffentlicht am 07.10.2019
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