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Convective self-aggregation in a mean flow

Jung, Hyunju 1; Naumann, Ann Kristin; Stevens, Bjorn
1 Institut für Meteorologie und Klimaforschung – Forschungsbereich Troposphäre (IMK-TRO), Karlsruher Institut für Technologie (KIT)


Convective self-aggregation is an atmospheric phenomenon seen in numerical simulations in a radiative convective equilibrium framework thought to be informative of some aspects of the behavior of real-world convection in the deep tropics. We impose a background mean wind flow on convection-permitting simulations through the surface flux calculation in an effort to understand how the asymmetry imposed by a mean wind influences the propagation of aggregated structures in convection. The simulations show that, with imposing mean flow, the organized convective system propagates in the direction of the flow but slows down compared to what pure advection would suggest, and it eventually becomes stationary relative to the surface after 15 simulation days. The termination of the propagation arises from momentum flux, which acts as a drag on the near-surface horizontal wind. In contrast, the thermodynamic response through the wind-induced surface heat exchange feedback is a relatively small effect, which slightly retards the propagation of the convection relative to the mean wind.

Verlagsausgabe §
DOI: 10.5445/IR/1000135992
Veröffentlicht am 30.07.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen-ID: 1000135992
Erschienen in Atmospheric Chemistry and Physics
Verlag European Geosciences Union (EGU)
Band 21
Heft 13
Seiten 10337-10345
Nachgewiesen in Web of Science
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