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DOI	10.5194/acp-22-3615-2022
	Observations of aerosol-vapor pressure deficit-evaporative fraction coupling over India
	Sarangi, Chandan; Chakraborty, T. C.; Tripathi, Sachchidanand; Krishnan, Mithun; Morrison, Ross; Evans, Jonathan; Mercado, Lina M.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	3615
结束页码	3629
卷号	22 期号:5 页码:15
英文摘要	Northern India is a densely populated subtropical region with heavy aerosol loading (mean aerosol optical depth or AOD is similar to 0.7), frequent heat waves, and strong atmosphere-biosphere coupling, making it ideal for studying the impacts of aerosols and the temperature variation in latent heat flux (LH) and evaporative fraction (EF). Here, using in situ observations during the onset of the summer monsoon over a semi-natural grassland site in this region, we confirm that strong co-variability exists among aerosols, LH, air temperature (T-air), and the vapor pressure deficit (VPD). Since the surface evapotranspiration is strongly controlled by both physical (available energy and moisture demand) and physiological (canopy and aerodynamic resistance) factors, we separately analyze our data for different combinations of aerosols and T-air/VPD changes. We find that aerosol loading and warmer conditions both reduce sensible heat (SH). Furthermore, we find that an increase in atmospheric VPD tends to decrease the gross primary production (GPP) and, thus, LH, most likely as a response to stomatal closure of the dominant grasses at this location. In contrast, under heavy aerosol loading, LH is enhanced partly due to the physiological control exerted by the diffuse radiation fertilization effect (thus increasing EF). Moreover, LH and EF increases with aerosol loading even under heat wave conditions, indicating a decoupling of the plant's response to the VPD enhancement (stomatal closure) in the presence of high aerosol conditions. Our results encourage detailed in situ experiments and mechanistic modeling of AOD-VPD-EF coupling for a better understanding of Indian monsoon dynamics and crop vulnerability in a heat stressed and heavily polluted future India.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000772231500001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273894
作者单位	Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Madras; Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Kanpur; Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Kanpur; Yale University; UK Centre for Ecology & Hydrology (UKCEH); University of Exeter; Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Madras
推荐引用方式 GB/T 7714	Sarangi, Chandan,Chakraborty, T. C.,Tripathi, Sachchidanand,et al. Observations of aerosol-vapor pressure deficit-evaporative fraction coupling over India[J],2022,22(5):15.
APA	Sarangi, Chandan.,Chakraborty, T. C..,Tripathi, Sachchidanand.,Krishnan, Mithun.,Morrison, Ross.,...&Mercado, Lina M..(2022).Observations of aerosol-vapor pressure deficit-evaporative fraction coupling over India.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(5),15.
MLA	Sarangi, Chandan,et al."Observations of aerosol-vapor pressure deficit-evaporative fraction coupling over India".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.5(2022):15.