干旱区生态环境知识资源中心(Arid): Assessment of regional aerosol radiative effects under the SWAAMI campaign - Part 2: Clear-sky direct shortwave radiative forcing using multi-year assimilated data over the Indian subcontinent

Arid

DOI	10.5194/acp-20-14237-2020
	Assessment of regional aerosol radiative effects under the SWAAMI campaign - Part 2: Clear-sky direct shortwave radiative forcing using multi-year assimilated data over the Indian subcontinent
	Pathak, Harshavardhana Sunil; Satheesh, Sreedharan Krishnakumari; Moorthy, Krishnaswamy Krishna; Nanjundiah, Ravi Shankar
通讯作者	Pathak, HS
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN	1680-7316
EISSN	1680-7324
出版年	2020
卷号	20 期号:22 页码:14237-14252
英文摘要	Clear-sky, direct shortwave aerosol radiative forcing (ARF) has been estimated over the Indian region, for the first time employing multi-year (2009-2013) gridded, assimilated aerosol products, as an important part of the SouthWest Asian Aerosol Monsoon Interactions (SWAAMI) which is a joint Indo-UK research field campaign focused at understanding the variabilities in atmospheric aerosols and their interactions with the Indian summer monsoon. The aerosol datasets have been constructed following statistical assimilation of concurrent data from a dense network of ground-based observatories and multi-satellite products, as described in Part 1 of this two-part paper. The ARF, thus estimated, is assessed for its superiority or otherwise over other ARF estimates based on satellite-retrieved aerosol products, over the Indian region, by comparing the radiative fluxes (upward) at the top of the atmosphere (TOA) estimated using assimilated and satellite products with spatiotemporally matched radiative flux values provided by CERES (Clouds and Earth's Radiant Energy System) single-scan footprint (SSF) product. This clearly demonstrated improved accuracy of the forcing estimates using the assimilated vis-avis satellite-based aerosol datasets at regional, subregional and seasonal scales. The regional distribution of diurnally averaged ARF estimates has revealed (a) significant differences from similar estimates made using currently available satellite data, not only in terms of magnitude but also the sign of TOA forcing; (b) the largest magnitudes of surface cooling and atmospheric warming over the Indo-Gangetic Plain (IGP) and arid regions from north-western India; and (c) negative TOA forcing over most parts of the Indian region, except for three subregions - the IGP, northwestern India and eastern parts of peninsular India where the TOA forcing changes to positive during pre-monsoon season. Aerosol-induced atmospheric warming rates, estimated using the assimilated data, demonstrate substantial spatial heterogeneities (similar to 0.2 to 2.0 K d(-1)) over the study domain with the IGP demonstrating relatively stronger atmospheric heating rates (similar to 0.6 to 2.0 K d(-1)). There exists a strong seasonality as well, with atmospheric warming being highest during pre-monsoon and lowest during winter seasons. It is to be noted that the present ARF estimates demonstrate substantially smaller uncertainties than their satellite counterparts, which is a natural consequence of reduced uncertainties in assimilated vis-a-vis satellite aerosol properties. The results demonstrate the potential application of the assimilated datasets and ARF estimates for improving accuracies of climate impact assessments at regional and subregional scales.
类型	Article
语种	英语
开放获取类型	gold, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000591599500003
WOS关键词	ANGULAR-DISTRIBUTION MODELS ; TROPICAL COASTAL STATION ; TEMPORAL HETEROGENEITY ; ANTHROPOGENIC SULFATE ; OPTICAL-PROPERTIES ; UNCERTAINTY ; INSTRUMENT ; SATELLITE ; CLOUDS ; IMPACT
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327595
作者单位	[Pathak, Harshavardhana Sunil; Satheesh, Sreedharan Krishnakumari; Moorthy, Krishnaswamy Krishna; Nanjundiah, Ravi Shankar] Indian Inst Sci, Ctr Atmospher & Ocean Sci, Bengaluru, India; [Satheesh, Sreedharan Krishnakumari; Nanjundiah, Ravi Shankar] Indian Inst Sci, Divecha Ctr Climate Change, DST Ctr Excellence Climate Change, Bengaluru, India; [Nanjundiah, Ravi Shankar] Indian Inst Trop Meteorol, Pune, Maharashtra, India
推荐引用方式 GB/T 7714	Pathak, Harshavardhana Sunil,Satheesh, Sreedharan Krishnakumari,Moorthy, Krishnaswamy Krishna,et al. Assessment of regional aerosol radiative effects under the SWAAMI campaign - Part 2: Clear-sky direct shortwave radiative forcing using multi-year assimilated data over the Indian subcontinent[J],2020,20(22):14237-14252.
APA	Pathak, Harshavardhana Sunil,Satheesh, Sreedharan Krishnakumari,Moorthy, Krishnaswamy Krishna,&Nanjundiah, Ravi Shankar.(2020).Assessment of regional aerosol radiative effects under the SWAAMI campaign - Part 2: Clear-sky direct shortwave radiative forcing using multi-year assimilated data over the Indian subcontinent.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(22),14237-14252.
MLA	Pathak, Harshavardhana Sunil,et al."Assessment of regional aerosol radiative effects under the SWAAMI campaign - Part 2: Clear-sky direct shortwave radiative forcing using multi-year assimilated data over the Indian subcontinent".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.22(2020):14237-14252.