What rainfall rates are most important to wet removal of different aerosol types?

<p>Both frequency and intensity of rainfall affect aerosol wet deposition. With a stochastic deep convection scheme implemented into two state-of-the-art global climate models (GCMs), a recent study found that aerosol burdens are increased globally by reduced climatological mean wet removal of...

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Autores principales:	Y. Wang, W. Xia, G. J. Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/f4d1e1f5b41b44b9a7b0bc01e2f6c50e
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spelling	oai:doaj.org-article:f4d1e1f5b41b44b9a7b0bc01e2f6c50e2021-11-18T15:40:08ZWhat rainfall rates are most important to wet removal of different aerosol types?10.5194/acp-21-16797-20211680-73161680-7324https://doaj.org/article/f4d1e1f5b41b44b9a7b0bc01e2f6c50e2021-11-01T00:00:00Zhttps://acp.copernicus.org/articles/21/16797/2021/acp-21-16797-2021.pdfhttps://doaj.org/toc/1680-7316https://doaj.org/toc/1680-7324<p>Both frequency and intensity of rainfall affect aerosol wet deposition. With a stochastic deep convection scheme implemented into two state-of-the-art global climate models (GCMs), a recent study found that aerosol burdens are increased globally by reduced climatological mean wet removal of aerosols due to suppressed light rain. Motivated by their work, a novel approach is developed in this study to detect what rainfall rates are most efficient for wet removal (scavenging amount mode) of different aerosol species of different sizes in GCMs and applied to the National Center for Atmospheric Research Community Atmosphere Model version 5 (CAM5) with and without the stochastic convection cases. Results show that in the standard CAM5, no obvious differences in the scavenging amount mode are found among different aerosol types. However, the scavenging amount modes differ in the Aitken, accumulation and coarse modes, showing around 10–12, 8–9 and 7–8 mm d<span class="inline-formula"><sup>−1</sup></span>, respectively, over the tropics. As latitude increases poleward, the scavenging amount mode in each aerosol mode is decreased substantially. The scavenging amount mode is generally smaller over land than over ocean. With stochastic convection, the scavenging amount mode for all aerosol species in each mode is systematically increased, which is the most prominent along the Intertropical Convergence Zone, exceeding 20 mm d<span class="inline-formula"><sup>−1</sup></span> for small particles. The scavenging amount modes in the two cases are both smaller than individual rainfall rates associated with the most accumulated rain (rainfall amount mode), further implying precipitation frequency is more important than precipitation intensity for aerosol wet removal. The notion of the scavenging amount mode can be applied to other GCMs to better understand the relation between rainfall and aerosol wet scavenging, which is important to better simulate aerosols.</p>Y. WangW. XiaG. J. ZhangCopernicus PublicationsarticlePhysicsQC1-999ChemistryQD1-999ENAtmospheric Chemistry and Physics, Vol 21, Pp 16797-16816 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Chemistry QD1-999
spellingShingle	Physics QC1-999 Chemistry QD1-999 Y. Wang W. Xia G. J. Zhang What rainfall rates are most important to wet removal of different aerosol types?
description	<p>Both frequency and intensity of rainfall affect aerosol wet deposition. With a stochastic deep convection scheme implemented into two state-of-the-art global climate models (GCMs), a recent study found that aerosol burdens are increased globally by reduced climatological mean wet removal of aerosols due to suppressed light rain. Motivated by their work, a novel approach is developed in this study to detect what rainfall rates are most efficient for wet removal (scavenging amount mode) of different aerosol species of different sizes in GCMs and applied to the National Center for Atmospheric Research Community Atmosphere Model version 5 (CAM5) with and without the stochastic convection cases. Results show that in the standard CAM5, no obvious differences in the scavenging amount mode are found among different aerosol types. However, the scavenging amount modes differ in the Aitken, accumulation and coarse modes, showing around 10–12, 8–9 and 7–8 mm d<span class="inline-formula"><sup>−1</sup></span>, respectively, over the tropics. As latitude increases poleward, the scavenging amount mode in each aerosol mode is decreased substantially. The scavenging amount mode is generally smaller over land than over ocean. With stochastic convection, the scavenging amount mode for all aerosol species in each mode is systematically increased, which is the most prominent along the Intertropical Convergence Zone, exceeding 20 mm d<span class="inline-formula"><sup>−1</sup></span> for small particles. The scavenging amount modes in the two cases are both smaller than individual rainfall rates associated with the most accumulated rain (rainfall amount mode), further implying precipitation frequency is more important than precipitation intensity for aerosol wet removal. The notion of the scavenging amount mode can be applied to other GCMs to better understand the relation between rainfall and aerosol wet scavenging, which is important to better simulate aerosols.</p>
format	article
author	Y. Wang W. Xia G. J. Zhang
author_facet	Y. Wang W. Xia G. J. Zhang
author_sort	Y. Wang
title	What rainfall rates are most important to wet removal of different aerosol types?
title_short	What rainfall rates are most important to wet removal of different aerosol types?
title_full	What rainfall rates are most important to wet removal of different aerosol types?
title_fullStr	What rainfall rates are most important to wet removal of different aerosol types?
title_full_unstemmed	What rainfall rates are most important to wet removal of different aerosol types?
title_sort	what rainfall rates are most important to wet removal of different aerosol types?
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/f4d1e1f5b41b44b9a7b0bc01e2f6c50e
work_keys_str_mv	AT ywang whatrainfallratesaremostimportanttowetremovalofdifferentaerosoltypes AT wxia whatrainfallratesaremostimportanttowetremovalofdifferentaerosoltypes AT gjzhang whatrainfallratesaremostimportanttowetremovalofdifferentaerosoltypes
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What rainfall rates are most important to wet removal of different aerosol types?

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