Tracking the influence of cloud condensation nuclei on summer diurnal precipitating systems over complex topography in Taiwan

<p>This study focuses on how aerosols, serving as cloud condensation nuclei (CCN), affect the properties of diurnal precipitation under the weak synoptic weather regime over complex topography, which is a common summertime environmental regime in Taiwan. Semi-realistic large-eddy simulations (...

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Autores principales: Y.-H. Chang, W.-T. Chen, C.-M. Wu, C. Moseley, C.-C. Wu
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Lenguaje:EN
Publicado: Copernicus Publications 2021
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Acceso en línea:https://doaj.org/article/7b9bbbf86ff148adbadce940a6e93e43
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spelling oai:doaj.org-article:7b9bbbf86ff148adbadce940a6e93e432021-11-16T15:25:07ZTracking the influence of cloud condensation nuclei on summer diurnal precipitating systems over complex topography in Taiwan10.5194/acp-21-16709-20211680-73161680-7324https://doaj.org/article/7b9bbbf86ff148adbadce940a6e93e432021-11-01T00:00:00Zhttps://acp.copernicus.org/articles/21/16709/2021/acp-21-16709-2021.pdfhttps://doaj.org/toc/1680-7316https://doaj.org/toc/1680-7324<p>This study focuses on how aerosols, serving as cloud condensation nuclei (CCN), affect the properties of diurnal precipitation under the weak synoptic weather regime over complex topography, which is a common summertime environmental regime in Taiwan. Semi-realistic large-eddy simulations (LESs) were carried out using TaiwanVVM and driven by idealized observational soundings. We perform object-based tracking analyses, which diagnose both the spatial and temporal connectivity of convective systems, aiming to reduce the variability in convection and align the aerosol effects on the mature stage of the convective life cycle. In the hotspot areas of strong orographic locking processes, the precipitation initiation is postponed significantly when the CCN concentration is increased from the clean scenario to the normal scenario, which prolongs the development of local circulation and convection. For this organized regime, the occurrence of the tracked extreme diurnal precipitating systems is notably enhanced. Also, the 99th percentile of the maximum rain rate, cloud depth, and in-cloud vertical velocity during the lifetime of the diurnal precipitating systems increases by 9.4 %, 4.4 %, and 1.3 %. This study demonstrates that the design of semi-realistic LESs, as well as the object-based tracking analyses, is useful to investigate the responses of orographically driven diurnal convective systems to ambient conditions.</p>Y.-H. ChangW.-T. ChenC.-M. WuC. MoseleyC.-C. WuCopernicus PublicationsarticlePhysicsQC1-999ChemistryQD1-999ENAtmospheric Chemistry and Physics, Vol 21, Pp 16709-16725 (2021)
institution DOAJ
collection DOAJ
language EN
topic Physics
QC1-999
Chemistry
QD1-999
spellingShingle Physics
QC1-999
Chemistry
QD1-999
Y.-H. Chang
W.-T. Chen
C.-M. Wu
C. Moseley
C.-C. Wu
Tracking the influence of cloud condensation nuclei on summer diurnal precipitating systems over complex topography in Taiwan
description <p>This study focuses on how aerosols, serving as cloud condensation nuclei (CCN), affect the properties of diurnal precipitation under the weak synoptic weather regime over complex topography, which is a common summertime environmental regime in Taiwan. Semi-realistic large-eddy simulations (LESs) were carried out using TaiwanVVM and driven by idealized observational soundings. We perform object-based tracking analyses, which diagnose both the spatial and temporal connectivity of convective systems, aiming to reduce the variability in convection and align the aerosol effects on the mature stage of the convective life cycle. In the hotspot areas of strong orographic locking processes, the precipitation initiation is postponed significantly when the CCN concentration is increased from the clean scenario to the normal scenario, which prolongs the development of local circulation and convection. For this organized regime, the occurrence of the tracked extreme diurnal precipitating systems is notably enhanced. Also, the 99th percentile of the maximum rain rate, cloud depth, and in-cloud vertical velocity during the lifetime of the diurnal precipitating systems increases by 9.4 %, 4.4 %, and 1.3 %. This study demonstrates that the design of semi-realistic LESs, as well as the object-based tracking analyses, is useful to investigate the responses of orographically driven diurnal convective systems to ambient conditions.</p>
format article
author Y.-H. Chang
W.-T. Chen
C.-M. Wu
C. Moseley
C.-C. Wu
author_facet Y.-H. Chang
W.-T. Chen
C.-M. Wu
C. Moseley
C.-C. Wu
author_sort Y.-H. Chang
title Tracking the influence of cloud condensation nuclei on summer diurnal precipitating systems over complex topography in Taiwan
title_short Tracking the influence of cloud condensation nuclei on summer diurnal precipitating systems over complex topography in Taiwan
title_full Tracking the influence of cloud condensation nuclei on summer diurnal precipitating systems over complex topography in Taiwan
title_fullStr Tracking the influence of cloud condensation nuclei on summer diurnal precipitating systems over complex topography in Taiwan
title_full_unstemmed Tracking the influence of cloud condensation nuclei on summer diurnal precipitating systems over complex topography in Taiwan
title_sort tracking the influence of cloud condensation nuclei on summer diurnal precipitating systems over complex topography in taiwan
publisher Copernicus Publications
publishDate 2021
url https://doaj.org/article/7b9bbbf86ff148adbadce940a6e93e43
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AT wtchen trackingtheinfluenceofcloudcondensationnucleionsummerdiurnalprecipitatingsystemsovercomplextopographyintaiwan
AT cmwu trackingtheinfluenceofcloudcondensationnucleionsummerdiurnalprecipitatingsystemsovercomplextopographyintaiwan
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