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: | , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/0cd7d24bbdec403390dc4e81b959e0ed |
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| Sumario: | <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> |
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