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Microphysical Pathways Active Within Thunderstorms and Their Sensitivity to CCN Concentration and Wind Shear

Barrett, Andrew I. 1; Hoose, Corinna ORCID iD icon 1
1 Institut für Meteorologie und Klimaforschung Troposphärenforschung (IMKTRO), Karlsruher Institut für Technologie (KIT)

Abstract:

The impact of cloud condensation nuclei (CCN) concentration on microphysical processes within thunderstorms and the resulting surface precipitation is not fully understood yet. In this work, an analysis of the microphysical pathways occurring in these clouds is proposed to systematically investigate and understand these sensitivities. Thunderstorms were simulated using convection-permitting (1 km horizontal grid spacing) idealized simulations with the ICON model, which included a 2-moment microphysics parameterization. Cloud condensation nuclei concentrations were increased from 100 to 3,200 CCN/cm3, in five different wind shear environments ranging from 18 to 50 m/s. Large and systematic decreases of surface precipitation (up to 35%) and hail (up to 90%) were found as CCN was increased. Wind shear changes the details, but not the sign, of the sensitivity to CCN. The microphysical process rates were tracked throughout each simulation, closing the mass budget for each hydrometeor class, and collected together into “microphysical pathways,” which quantify the different growth processes leading to surface precipitation. Almost all surface precipitation occurred through the mixed-phase pathway, where graupel and hail grow by riming and later melt as they fall to the surface. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000157384
Veröffentlicht am 16.04.2023
Originalveröffentlichung
DOI: 10.1029/2022JD036965
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Dimensions
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Troposphärenforschung (IMKTRO)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 16.03.2023
Sprache Englisch
Identifikator ISSN: 2169-897X, 2169-8996
KITopen-ID: 1000157384
HGF-Programm 12.11.26 (POF IV, LK 01) Aerosol-Cloud-Climate-Interaction
Erschienen in Journal of Geophysical Research: Atmospheres
Verlag John Wiley and Sons
Band 128
Heft 5
Seiten Art-Nr:e2022JD036965
Nachgewiesen in Web of Science
Dimensions
Scopus
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