干旱区生态环境知识资源中心(Arid): Long-term climatology and spatial trends of absorption, scattering, and total aerosol optical depths over East Africa during 2001-2019

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DOI	10.1007/s11356-022-20022-6
	Long-term climatology and spatial trends of absorption, scattering, and total aerosol optical depths over East Africa during 2001-2019
	Khamala, Geoffrey W.; Makokha, John W.; Boiyo, Richard; Kumar, Kanike Raghavendra
通讯作者	Khamala, GW
来源期刊	ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
ISSN	0944-1344
EISSN	1614-7499
出版年	2022
卷号	29 期号:40 页码:61283-61297
英文摘要	The unprecedented increase in anthropogenic activities, coupled with the prevailing climatic conditions, has increased the aerosol load over East Africa (EA). Given this, the present study examined the trends in total, absorption, scattering, and total aerosol extinction optical depth (TAOD, AAOD, SAOD, and TAEOD) over EA, alongside trends in single scattering albedo (SSA). For this purpose, the AOD of different optical properties retrieved from multiple sensors and the Modern-Era Retrospective Analysis for Research and Applications (MERRA-2) model between January 2001 to December 2019 were utilized to estimate trends and assess their statistical significance. The spatial patterns of seasonal mean AOD from the Moderate-resolution Imaging Spectroradiometer (MODIS) sensor and MERRA-2 model were generally characterized with high (>0.35) and low (<0.2) AOD centers over EA observed during the local dry and wet seasons, respectively. Also, the spatial trend analysis revealed a general increase in TAOD, being positive and significant over the arid and semi-arid zones of the northeastern part of EA, which is majorly dominated by locally derived dust. The local dry (wet) months generally experienced positive (negative) trends in TAOD, associated with seasonal cycles of rainfall. High and significant positive trends in AAOD were dominated over the study domain, attributed to an increased amount of biomass burning, variations in soil moisture, and changes in the rainfall pattern. The trends in TAEOD showed a distinct pattern, except over some months that depicted significant increasing trends attributed to changes in climatic conditions and anthropogenic activities. At last, the study domain exhibited decreasing trends in SSA, signifying strong absorption of direct solar radiation resulting in a warming effect. The study revealed patterns of trends in aerosol optical properties and forms the basis for further research in aerosols over EA.
英文关键词	MODIS OMI MERRA-2 AOD Spatial trends East Africa
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000784858200003
WOS关键词	AIR-POLLUTION ; MODIS ; PRODUCTS ; CHINA ; MISR ; OMI ; AERONET ; EMISSIONS ; RADIATION ; NAIROBI
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392523
推荐引用方式 GB/T 7714	Khamala, Geoffrey W.,Makokha, John W.,Boiyo, Richard,et al. Long-term climatology and spatial trends of absorption, scattering, and total aerosol optical depths over East Africa during 2001-2019[J],2022,29(40):61283-61297.
APA	Khamala, Geoffrey W.,Makokha, John W.,Boiyo, Richard,&Kumar, Kanike Raghavendra.(2022).Long-term climatology and spatial trends of absorption, scattering, and total aerosol optical depths over East Africa during 2001-2019.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,29(40),61283-61297.
MLA	Khamala, Geoffrey W.,et al."Long-term climatology and spatial trends of absorption, scattering, and total aerosol optical depths over East Africa during 2001-2019".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 29.40(2022):61283-61297.