Distinct impacts on precipitation by aerosol radiative effect over three different megacity regions of eastern China

<p>Many studies have investigated the impacts of aerosol on the intensity and amount of precipitation, but few have been done so regarding the impacts of aerosol on the start and peak times of precipitation. Using the high-resolution precipitation, aerosol, and meteorological data in the warm...

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Autores principales:	Y. Sun, C. Zhao
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/0cd7d24bbdec403390dc4e81b959e0ed
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id	oai:doaj.org-article:0cd7d24bbdec403390dc4e81b959e0ed
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spelling	oai:doaj.org-article:0cd7d24bbdec403390dc4e81b959e0ed2021-11-12T08:00:09ZDistinct impacts on precipitation by aerosol radiative effect over three different megacity regions of eastern China10.5194/acp-21-16555-20211680-73161680-7324https://doaj.org/article/0cd7d24bbdec403390dc4e81b959e0ed2021-11-01T00:00:00Zhttps://acp.copernicus.org/articles/21/16555/2021/acp-21-16555-2021.pdfhttps://doaj.org/toc/1680-7316https://doaj.org/toc/1680-7324<p>Many studies have investigated the impacts of aerosol on the intensity and amount of precipitation, but few have been done so regarding the impacts of aerosol on the start and peak times of precipitation. Using the high-resolution precipitation, aerosol, and meteorological data in the warm season of June–August from 2015 to 2020, this study investigates the influence of aerosol on the start and peak times of precipitation over three different regions, the North China Plain (NCP), the Yangtze River Delta (YRD), and the Pearl River Delta (PRD). It shows that the period with the highest frequency of precipitation start time, defined as the frequent period (FP) of precipitation start time, is delayed and prolonged by aerosols in NCP, contributing to the similar durations of precipitation in NCP, YRD, and PRD. This study also shows that different types of aerosol (absorbing versus scattering) have caused different influences on the start and peak times of precipitation over the three study regions. The precipitation start time is 3 h advanced in NCP but 2 h delayed in PRD by aerosols during precipitation FP and shows no response to aerosol in YRD. Compared to stratiform precipitation, the convective precipitation is more sensitive to aerosol. The start and peak times of convective precipitation show similar responses to aerosols. This study further shows that the aerosol impacts on precipitation can vary with meteorological conditions. Humidity is beneficial to precipitation, which can advance the precipitation start and peak times and prolong the precipitation duration time. Correspondingly, the impacts of aerosol on start time of precipitation are significant under low humidity or weak low tropospheric stability conditions. The impacts of vertical wind shear (WS) on the start and peak times of precipitation are contrary to that of aerosols, resulting in the fact that WS inhibits the aerosol effects on precipitation.</p>Y. SunC. ZhaoCopernicus PublicationsarticlePhysicsQC1-999ChemistryQD1-999ENAtmospheric Chemistry and Physics, Vol 21, Pp 16555-16574 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Chemistry QD1-999
spellingShingle	Physics QC1-999 Chemistry QD1-999 Y. Sun C. Zhao Distinct impacts on precipitation by aerosol radiative effect over three different megacity regions of eastern China
description	<p>Many studies have investigated the impacts of aerosol on the intensity and amount of precipitation, but few have been done so regarding the impacts of aerosol on the start and peak times of precipitation. Using the high-resolution precipitation, aerosol, and meteorological data in the warm season of June–August from 2015 to 2020, this study investigates the influence of aerosol on the start and peak times of precipitation over three different regions, the North China Plain (NCP), the Yangtze River Delta (YRD), and the Pearl River Delta (PRD). It shows that the period with the highest frequency of precipitation start time, defined as the frequent period (FP) of precipitation start time, is delayed and prolonged by aerosols in NCP, contributing to the similar durations of precipitation in NCP, YRD, and PRD. This study also shows that different types of aerosol (absorbing versus scattering) have caused different influences on the start and peak times of precipitation over the three study regions. The precipitation start time is 3 h advanced in NCP but 2 h delayed in PRD by aerosols during precipitation FP and shows no response to aerosol in YRD. Compared to stratiform precipitation, the convective precipitation is more sensitive to aerosol. The start and peak times of convective precipitation show similar responses to aerosols. This study further shows that the aerosol impacts on precipitation can vary with meteorological conditions. Humidity is beneficial to precipitation, which can advance the precipitation start and peak times and prolong the precipitation duration time. Correspondingly, the impacts of aerosol on start time of precipitation are significant under low humidity or weak low tropospheric stability conditions. The impacts of vertical wind shear (WS) on the start and peak times of precipitation are contrary to that of aerosols, resulting in the fact that WS inhibits the aerosol effects on precipitation.</p>
format	article
author	Y. Sun C. Zhao
author_facet	Y. Sun C. Zhao
author_sort	Y. Sun
title	Distinct impacts on precipitation by aerosol radiative effect over three different megacity regions of eastern China
title_short	Distinct impacts on precipitation by aerosol radiative effect over three different megacity regions of eastern China
title_full	Distinct impacts on precipitation by aerosol radiative effect over three different megacity regions of eastern China
title_fullStr	Distinct impacts on precipitation by aerosol radiative effect over three different megacity regions of eastern China
title_full_unstemmed	Distinct impacts on precipitation by aerosol radiative effect over three different megacity regions of eastern China
title_sort	distinct impacts on precipitation by aerosol radiative effect over three different megacity regions of eastern china
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/0cd7d24bbdec403390dc4e81b959e0ed
work_keys_str_mv	AT ysun distinctimpactsonprecipitationbyaerosolradiativeeffectoverthreedifferentmegacityregionsofeasternchina AT czhao distinctimpactsonprecipitationbyaerosolradiativeeffectoverthreedifferentmegacityregionsofeasternchina
_version_	1718431091990200320

Distinct impacts on precipitation by aerosol radiative effect over three different megacity regions of eastern China

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