干旱区生态环境知识资源中心(Arid): Aerosol-induced perturbation of surface fluxes over different landscapes in a tropical region

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DOI	10.1080/01431161.2018.1523586
	Aerosol-induced perturbation of surface fluxes over different landscapes in a tropical region
	Latha, R.1; Murthy, B. S.1; Vinayak, B.1,2
通讯作者	Latha, R.
来源期刊	INTERNATIONAL JOURNAL OF REMOTE SENSING
ISSN	0143-1161
EISSN	1366-5901
出版年	2019
卷号	40 期号:21 页码:8203-8221
英文摘要	Global picture of modification of land surface fluxes due to aerosol loading, especially over different landscapes, is not yet clear. The impact of aerosols on surface fluxes over Indo-Gangetic Basin, a highly polluted region, is studied by selecting four stations in the north Indian plains that are agriculturally heterogeneous in nature, viz., short crop area, industrial area, seasonal agricultural area, and permanent dense canopy area. Data from satellite (Moderate Resolution Imaging Spectroradiometer (MODIS)), model (Global Land Data Assimilation (GLDAS-NOAH), National Centre for Environmental Prediction/Oregon State University/Airforce/Hydrology Research Laboratory, and reanalysis (MERRA-Modern-Era Retrospective analysis for Research and Applications) as well as ground observations (AERONET (AErosol RObotic NETwork) and Dibrugarh University measurements) on daily and monthly scales are used to validate and assess the aerosol-induced modification of surface fluxes. To ensure that satellite products are reasonably accurate, aerosol optical depth (AOD) and evapotranspiration (ET) from MODIS are validated against ground truth of AOD and ET from GLDAS-NOAH and found to have correlations of 0.90 and 0.76, respectively. Aerosol radiative forcing (ARF) was calculated as the difference between 'clear sky' and 'clean clear sky' of net radiation (R) at surface obtained from MERRA. Since surface fluxes are perturbed directly by ARF on a daily scale with maximum effect during 'sunlit' hours, change in fluxes is calculated on the daily scale. The impact of aerosols alone on latent heat flux (LE) is quantified by using the linear relation between R and LE along with the aerosol-induced reduction of net radiation. Latent heat flux and R from GLDAS-NOAH showed an excellent correlation between 0.75 and 0.97. The impact of aerosols on surface fluxes, represented as perturbed latent and sensible heat fluxes normalized by ARF, is found to be followed an asymptotic curve against Bowen ratio (B) which indicates aridity of the land surface. This study shows that the aerosols reduce LE by 60% of ARF over the permanent dense canopy with considerable soil moisture (B = 0.5), while the same amount of ARF reduces LE by 25% only over the semi-arid region (B = 2) over the north Indian plains for the period from October 2008 to May 2009.
类型	Article
语种	英语
国家	India
收录类别	SCI-E
WOS记录号	WOS:000472112000008
WOS关键词	INDO-GANGETIC BASIN ; SAP FLOW ; EVAPOTRANSPIRATION ; VEGETATION ; FOREST ; CROP
WOS类目	Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向	Remote Sensing ; Imaging Science & Photographic Technology
EI主题词	2019-11-02
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310730
作者单位	1.Indian Inst Trop Meteorol, NCL Post, Pune 411008, Maharashtra, India; 2.Savitribai Phule Pune Univ, Pune, Maharashtra, India
推荐引用方式 GB/T 7714	Latha, R.,Murthy, B. S.,Vinayak, B.. Aerosol-induced perturbation of surface fluxes over different landscapes in a tropical region[J],2019,40(21):8203-8221.
APA	Latha, R.,Murthy, B. S.,&Vinayak, B..(2019).Aerosol-induced perturbation of surface fluxes over different landscapes in a tropical region.INTERNATIONAL JOURNAL OF REMOTE SENSING,40(21),8203-8221.
MLA	Latha, R.,et al."Aerosol-induced perturbation of surface fluxes over different landscapes in a tropical region".INTERNATIONAL JOURNAL OF REMOTE SENSING 40.21(2019):8203-8221.