Nissen, Silas Boye and Haerter, Jan O. ORCID: https://orcid.org/0000-0002-8617-3847 (2021) Circling in on Convective Self‐Aggregation. Journal of Geophysical Research: Atmospheres . DOI https://doi.org/10.1029/2021JD035331.

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Abstract

In radiative-convective equilibrium simulations, convective self-aggregation (CSA) is the spontaneous organization into segregated cloudy and cloud-free regions. Evidence exists for how CSA is stabilized, but how it arises favorably on large domains is not settled. Using large-eddy simulations, we link the spatial organization emerging from the interaction of cold pools (CPs) to CSA. We systematically weaken simulated rain evaporation to reduce maximal CP radii, urn:x-wiley:2169897X:media:jgrd57356:jgrd57356-math-0001 and find reducing urn:x-wiley:2169897X:media:jgrd57356:jgrd57356-math-0002 causes CSA to occur earlier. We further identify a typical rain cell generation time and a minimum radius, urn:x-wiley:2169897X:media:jgrd57356:jgrd57356-math-0003, around a given rain cell, within which the formation of subsequent rain cells is suppressed. Incorporating urn:x-wiley:2169897X:media:jgrd57356:jgrd57356-math-0004 and urn:x-wiley:2169897X:media:jgrd57356:jgrd57356-math-0005, we propose a toy model that captures how CSA arises earlier on large domains: when two CPs of radii urn:x-wiley:2169897X:media:jgrd57356:jgrd57356-math-0006 collide, they form a new convective event. These findings imply that interactions between CPs may explain the initial stages of CSA.

Document Type: Article
Programme Area (enter as: PA1/PA2/PA3/PA4/PA5): PA2
Research affiliation: Theoretical Ecology and Modelling > Complexity and Climate
Affiliations > Not ZMT
Refereed: Yes
Open Access Journal?: No
DOI etc.: https://doi.org/10.1029/2021JD035331
ISSN: 2169-897X
Date Deposited: 12 Oct 2021 12:45
Last Modified: 12 Oct 2021 12:45
URI: http://cris.leibniz-zmt.de/id/eprint/4740

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