Assessment of Recent Changes in Dust over South Asia Using RegCM4 Regional Climate Model

Pre-monsoon dust aerosols over Indian regions are closely linked to the monsoon dynamics and Indian summer monsoon rainfall. Past observational studies have shown a decline in dust loading over the Indian landmass potentially caused by changing rainfall patterns over the desert regions. Such changes...

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Auteurs principaux:	Acharya Asutosh, S.K Pandey, V Vinoj, Ramakrishna Ramisetty, Nishant Mittal
Format:	article
Langue:	EN
Publié:	MDPI AG 2021
Sujets:	dust aerosols radiative forcing regional climate rainfall RegCM Science Q
Accès en ligne:	https://doaj.org/article/0d83c94444c4457783400c3be3a68bf2
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spelling	oai:doaj.org-article:0d83c94444c4457783400c3be3a68bf22021-11-11T18:53:37ZAssessment of Recent Changes in Dust over South Asia Using RegCM4 Regional Climate Model10.3390/rs132143092072-4292https://doaj.org/article/0d83c94444c4457783400c3be3a68bf22021-10-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/21/4309https://doaj.org/toc/2072-4292Pre-monsoon dust aerosols over Indian regions are closely linked to the monsoon dynamics and Indian summer monsoon rainfall. Past observational studies have shown a decline in dust loading over the Indian landmass potentially caused by changing rainfall patterns over the desert regions. Such changes are expected to have a far-reaching impact on regional energy balance and monsoon rainfall. Using a regional climate-chemistry model, RegCM4.5, with an updated land module, we have simulated the long-term (2001–2015) changes in dust over the arid and semi-arid dust source regions of the North-Western part of the subcontinent. It is found that the area-averaged dust aerosol optical depth (AOD) over the arid and semi-arid desert regions has declined by 17% since the start of this millennium. The rainfall over these regions exhibits a positive trend of 0.1 mm day<sup>−1</sup>year<sup>−1</sup> and a net increase of >50%. The wet deposition is found to be dominant and ~five-fold larger in magnitude over dry deposition and exhibits total changes of ~79 and 48% in the trends in atmospheric dust. As a response, a significant difference in the surface (11%), top of the atmosphere radiative forcing (7%), and widespread atmospheric cooling are observed in the short wave domain of radiation spectrum over the Northern part of the Indian landmass. Such quantification and long-term change studies are necessary for understanding regional climate change and the water cycle.Acharya AsutoshS.K PandeyV VinojRamakrishna RamisettyNishant MittalMDPI AGarticledust aerosolsradiative forcingregional climaterainfallRegCMScienceQENRemote Sensing, Vol 13, Iss 4309, p 4309 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	dust aerosols radiative forcing regional climate rainfall RegCM Science Q
spellingShingle	dust aerosols radiative forcing regional climate rainfall RegCM Science Q Acharya Asutosh S.K Pandey V Vinoj Ramakrishna Ramisetty Nishant Mittal Assessment of Recent Changes in Dust over South Asia Using RegCM4 Regional Climate Model
description	Pre-monsoon dust aerosols over Indian regions are closely linked to the monsoon dynamics and Indian summer monsoon rainfall. Past observational studies have shown a decline in dust loading over the Indian landmass potentially caused by changing rainfall patterns over the desert regions. Such changes are expected to have a far-reaching impact on regional energy balance and monsoon rainfall. Using a regional climate-chemistry model, RegCM4.5, with an updated land module, we have simulated the long-term (2001–2015) changes in dust over the arid and semi-arid dust source regions of the North-Western part of the subcontinent. It is found that the area-averaged dust aerosol optical depth (AOD) over the arid and semi-arid desert regions has declined by 17% since the start of this millennium. The rainfall over these regions exhibits a positive trend of 0.1 mm day<sup>−1</sup>year<sup>−1</sup> and a net increase of >50%. The wet deposition is found to be dominant and ~five-fold larger in magnitude over dry deposition and exhibits total changes of ~79 and 48% in the trends in atmospheric dust. As a response, a significant difference in the surface (11%), top of the atmosphere radiative forcing (7%), and widespread atmospheric cooling are observed in the short wave domain of radiation spectrum over the Northern part of the Indian landmass. Such quantification and long-term change studies are necessary for understanding regional climate change and the water cycle.
format	article
author	Acharya Asutosh S.K Pandey V Vinoj Ramakrishna Ramisetty Nishant Mittal
author_facet	Acharya Asutosh S.K Pandey V Vinoj Ramakrishna Ramisetty Nishant Mittal
author_sort	Acharya Asutosh
title	Assessment of Recent Changes in Dust over South Asia Using RegCM4 Regional Climate Model
title_short	Assessment of Recent Changes in Dust over South Asia Using RegCM4 Regional Climate Model
title_full	Assessment of Recent Changes in Dust over South Asia Using RegCM4 Regional Climate Model
title_fullStr	Assessment of Recent Changes in Dust over South Asia Using RegCM4 Regional Climate Model
title_full_unstemmed	Assessment of Recent Changes in Dust over South Asia Using RegCM4 Regional Climate Model
title_sort	assessment of recent changes in dust over south asia using regcm4 regional climate model
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/0d83c94444c4457783400c3be3a68bf2
work_keys_str_mv	AT acharyaasutosh assessmentofrecentchangesindustoversouthasiausingregcm4regionalclimatemodel AT skpandey assessmentofrecentchangesindustoversouthasiausingregcm4regionalclimatemodel AT vvinoj assessmentofrecentchangesindustoversouthasiausingregcm4regionalclimatemodel AT ramakrishnaramisetty assessmentofrecentchangesindustoversouthasiausingregcm4regionalclimatemodel AT nishantmittal assessmentofrecentchangesindustoversouthasiausingregcm4regionalclimatemodel
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Assessment of Recent Changes in Dust over South Asia Using RegCM4 Regional Climate Model

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