Cold Pool Responses to Changes in Soil Moisture

Abstract This study examines the role of soil moisture in modulating convective cold pool properties in an idealized modeling framework that uses a cloud‐resolving model coupled to an interactive land surface model. Five high‐resolution simulations of tropical continental convection are conducted in...

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Autores principales:	Aryeh J. Drager, Leah D. Grant, Susan C. van denHeever
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2020
Materias:	cold pools soil moisture convection density currents Physical geography GB3-5030 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/c4a9d6dc156e4a12bc185f9a9c4360e6
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spelling	oai:doaj.org-article:c4a9d6dc156e4a12bc185f9a9c4360e62021-11-15T14:20:26ZCold Pool Responses to Changes in Soil Moisture1942-246610.1029/2019MS001922https://doaj.org/article/c4a9d6dc156e4a12bc185f9a9c4360e62020-08-01T00:00:00Zhttps://doi.org/10.1029/2019MS001922https://doaj.org/toc/1942-2466Abstract This study examines the role of soil moisture in modulating convective cold pool properties in an idealized modeling framework that uses a cloud‐resolving model coupled to an interactive land surface model. Five high‐resolution simulations of tropical continental convection are conducted in which the initial soil moisture is varied. The hundreds of cold pools forming within each simulation are identified and composited across space and time using an objective cold pool identification algorithm. Several important findings emerge from this analysis. Lower soil moisture results in greater daytime heating of the surface, which produces a deeper, drier subcloud layer. As a result, latent cooling through the evaporation of precipitation is enhanced, and cold pools are stronger and deeper. Increased propagation speed, combined with wider rain shafts, results in wider cold pools. Finally, the rings of enhanced water vapor that surround each cold pool when soil is wet disappear when the soil moisture is reduced, due to the suppression of surface latent heat fluxes. Instead, short‐lived “puddles” of enhanced water vapor permeate the cold pools. The results are nonlinear in that the properties of the cold pools in the two driest‐soil simulations depart substantially from the cold pool properties in the three simulations initialized with wetter soil. The dividing line between the resulting wet‐soil and dry‐soil regimes is the permanent wilting point. Below the permanent wilting point, transpiration is subdued due to a sharp increase in water stress. These results emphasize the role of land surface‐boundary layer‐cloud interactions in modulating cold pool properties.Aryeh J. DragerLeah D. GrantSusan C. van denHeeverAmerican Geophysical Union (AGU)articlecold poolssoil moistureconvectiondensity currentsPhysical 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	cold pools soil moisture convection density currents Physical geography GB3-5030 Oceanography GC1-1581
spellingShingle	cold pools soil moisture convection density currents Physical geography GB3-5030 Oceanography GC1-1581 Aryeh J. Drager Leah D. Grant Susan C. van denHeever Cold Pool Responses to Changes in Soil Moisture
description	Abstract This study examines the role of soil moisture in modulating convective cold pool properties in an idealized modeling framework that uses a cloud‐resolving model coupled to an interactive land surface model. Five high‐resolution simulations of tropical continental convection are conducted in which the initial soil moisture is varied. The hundreds of cold pools forming within each simulation are identified and composited across space and time using an objective cold pool identification algorithm. Several important findings emerge from this analysis. Lower soil moisture results in greater daytime heating of the surface, which produces a deeper, drier subcloud layer. As a result, latent cooling through the evaporation of precipitation is enhanced, and cold pools are stronger and deeper. Increased propagation speed, combined with wider rain shafts, results in wider cold pools. Finally, the rings of enhanced water vapor that surround each cold pool when soil is wet disappear when the soil moisture is reduced, due to the suppression of surface latent heat fluxes. Instead, short‐lived “puddles” of enhanced water vapor permeate the cold pools. The results are nonlinear in that the properties of the cold pools in the two driest‐soil simulations depart substantially from the cold pool properties in the three simulations initialized with wetter soil. The dividing line between the resulting wet‐soil and dry‐soil regimes is the permanent wilting point. Below the permanent wilting point, transpiration is subdued due to a sharp increase in water stress. These results emphasize the role of land surface‐boundary layer‐cloud interactions in modulating cold pool properties.
format	article
author	Aryeh J. Drager Leah D. Grant Susan C. van denHeever
author_facet	Aryeh J. Drager Leah D. Grant Susan C. van denHeever
author_sort	Aryeh J. Drager
title	Cold Pool Responses to Changes in Soil Moisture
title_short	Cold Pool Responses to Changes in Soil Moisture
title_full	Cold Pool Responses to Changes in Soil Moisture
title_fullStr	Cold Pool Responses to Changes in Soil Moisture
title_full_unstemmed	Cold Pool Responses to Changes in Soil Moisture
title_sort	cold pool responses to changes in soil moisture
publisher	American Geophysical Union (AGU)
publishDate	2020
url	https://doaj.org/article/c4a9d6dc156e4a12bc185f9a9c4360e6
work_keys_str_mv	AT aryehjdrager coldpoolresponsestochangesinsoilmoisture AT leahdgrant coldpoolresponsestochangesinsoilmoisture AT susancvandenheever coldpoolresponsestochangesinsoilmoisture
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Cold Pool Responses to Changes in Soil Moisture

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