The Relationship Between Convective Clustering and Mean Tropical Climate in Aquaplanet Simulations

Abstract Convective clustering, the spatial organization of tropical deep convection, can manifest itself in two ways: through a decrease in the total area covered by convection and/or through a decrease in the number of convective areas. Much of our current understanding of convective clustering co...

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Autores principales:	Max Popp, Nicholas J. Lutsko, Sandrine Bony
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2020
Materias:	Physical geography GB3-5030 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/5383fffe747c41a2a2bdd64195304a43
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spelling	oai:doaj.org-article:5383fffe747c41a2a2bdd64195304a432021-11-15T14:20:27ZThe Relationship Between Convective Clustering and Mean Tropical Climate in Aquaplanet Simulations1942-246610.1029/2020MS002070https://doaj.org/article/5383fffe747c41a2a2bdd64195304a432020-08-01T00:00:00Zhttps://doi.org/10.1029/2020MS002070https://doaj.org/toc/1942-2466Abstract Convective clustering, the spatial organization of tropical deep convection, can manifest itself in two ways: through a decrease in the total area covered by convection and/or through a decrease in the number of convective areas. Much of our current understanding of convective clustering comes from simulations in idealized radiative convective equilibrium (RCE) configurations. In these simulations the two forms of convective clustering tend to covary, and their individual effects on the climate are thus hard to disentangle. This study shows that in aquaplanet simulations with more realistic boundary conditions, such as meridional gradients of surface temperature and rotational forces, the two aspects of convective clustering are not equivalent and are associated with different impacts on the large‐scale climate. For instance, reducing the convective area in the equatorial region in the aquaplanet simulations results in broader meridional humidity and rain distributions and in lower tropospheric temperatures throughout the tropics. By contrast, the number of convective regions primarily impacts the zonal variance of humidity‐related quantities in the aquaplanet simulations, as the distribution of convective regions affects the size of the subsidence regions and thereby the moistening influence of convective regions. The aquaplanet simulations confirm many other qualitative results from RCE simulations, such as a reduction of equatorial tropospheric humidity when the area covered by convection diminishes.Max PoppNicholas J. LutskoSandrine BonyAmerican Geophysical Union (AGU)articlePhysical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 12, Iss 8, Pp n/a-n/a (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physical geography GB3-5030 Oceanography GC1-1581
spellingShingle	Physical geography GB3-5030 Oceanography GC1-1581 Max Popp Nicholas J. Lutsko Sandrine Bony The Relationship Between Convective Clustering and Mean Tropical Climate in Aquaplanet Simulations
description	Abstract Convective clustering, the spatial organization of tropical deep convection, can manifest itself in two ways: through a decrease in the total area covered by convection and/or through a decrease in the number of convective areas. Much of our current understanding of convective clustering comes from simulations in idealized radiative convective equilibrium (RCE) configurations. In these simulations the two forms of convective clustering tend to covary, and their individual effects on the climate are thus hard to disentangle. This study shows that in aquaplanet simulations with more realistic boundary conditions, such as meridional gradients of surface temperature and rotational forces, the two aspects of convective clustering are not equivalent and are associated with different impacts on the large‐scale climate. For instance, reducing the convective area in the equatorial region in the aquaplanet simulations results in broader meridional humidity and rain distributions and in lower tropospheric temperatures throughout the tropics. By contrast, the number of convective regions primarily impacts the zonal variance of humidity‐related quantities in the aquaplanet simulations, as the distribution of convective regions affects the size of the subsidence regions and thereby the moistening influence of convective regions. The aquaplanet simulations confirm many other qualitative results from RCE simulations, such as a reduction of equatorial tropospheric humidity when the area covered by convection diminishes.
format	article
author	Max Popp Nicholas J. Lutsko Sandrine Bony
author_facet	Max Popp Nicholas J. Lutsko Sandrine Bony
author_sort	Max Popp
title	The Relationship Between Convective Clustering and Mean Tropical Climate in Aquaplanet Simulations
title_short	The Relationship Between Convective Clustering and Mean Tropical Climate in Aquaplanet Simulations
title_full	The Relationship Between Convective Clustering and Mean Tropical Climate in Aquaplanet Simulations
title_fullStr	The Relationship Between Convective Clustering and Mean Tropical Climate in Aquaplanet Simulations
title_full_unstemmed	The Relationship Between Convective Clustering and Mean Tropical Climate in Aquaplanet Simulations
title_sort	relationship between convective clustering and mean tropical climate in aquaplanet simulations
publisher	American Geophysical Union (AGU)
publishDate	2020
url	https://doaj.org/article/5383fffe747c41a2a2bdd64195304a43
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The Relationship Between Convective Clustering and Mean Tropical Climate in Aquaplanet Simulations

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