气候变化领域集成服务门户(CCPortal): Cropland trees need to be included for accurate model simulations of land-atmosphere heat fluxes; temperature; boundary layer height; and ozone

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DOI	10.1016/j.scitotenv.2020.141728
	Cropland trees need to be included for accurate model simulations of land-atmosphere heat fluxes; temperature; boundary layer height; and ozone
	Mishra A.K.; Sinha B.; Kumar R.; Barth M.; Hakkim H.; Kumar V.; Kumar A.; Datta S.; Guenther A.; Sinha V.
发表日期	2021
ISSN	489697
卷号	751
英文摘要	Trees significantly impact land-atmosphere feedbacks through evapotranspiration, photosynthesis and isoprene emissions. These processes influence the local microclimate, air quality and can mitigate temperature extremes and sequester carbon dioxide. Despite such importance, currently only 5 out of 15 atmospheric chemistry climate models even partially account for the presence of cropland trees. We first show that the tree cover over intensely farmed regions in Asia, Australia and South America is significantly underestimated (e.g. only 1–3% tree cover over north-India) in the Model of Emissions of Gases and Aerosol from Nature (MEGAN) and absent in Noah land-surface module of the Weather Research and Forecasting (WRF-Chem) Model. By including the actual tree cover (~10%) over the north-west Indo Gangetic Plain in the Noah land-surface module of the WRF-Chem and the MEGAN module, during the rice growing monsoon season in August, we find that the latent heat flux alone increases by 100%–300% while sensible heat flux reduces by 50%–100%, leading to a reduction in daytime boundary layer height by 200–400 m. This greatly improves agreement between the modelled and measured temperature, boundary layer height and surface ozone, which were earlier overestimated and isoprene and its oxidation products which were earlier underestimated. Mitigating peak daytime temperatures and ozone improves rice production by 10 to 20%. Our findings from north west Indo-Gangetic Plain establish that such plantations mitigate heat stress, and have beneficial effects on crop yields while also sequestering carbon. Expanding agroforestry practices to 50% of the cropland area could result in up to 40% yield gain regionally. Implementing such strategies globally could increase crop production and sequester 0.3–30 GtC per year, and therefore future climate mitigation and food security efforts should consider stakeholder participation for increased cropland agroforestry in view of its beneficial effects. © 2020 Elsevier B.V.
英文关键词	Agroforestry; Air quality; Crop yield; Heat stress; Land-atmosphere interactions
scopus关键词	Air quality; Atmospheric chemistry; Boundary layer flow; Boundary layers; Carbon dioxide; Carbon dioxide process; Climate models; Crops; Cultivation; Food supply; Forestry; Heat flux; Isoprene; Landforms; Ozone; Ozone layer; Surface measurement; Weather forecasting; Boundary layer heights; Chemistry-climate models; Indo-Gangetic Plains; Measured temperatures; Sequestering carbon; Stakeholder participation; Temperature extremes; Weather research and forecasting; Atmospheric temperature; isoprene; ozone; ozone; accuracy assessment; agricultural land; agroforestry; boundary layer; carbon sequestration; climate effect; computer simulation; feedback mechanism; forest cover; land-atmosphere interaction; latent heat flux; microclimate; model test; numerical model; oxidation; ozone; sensible heat flux; stakeholder; temperature profile; agroforestry; Article; Asia; Australia; boundary layer; controlled study; crop production; cropland; environmental temperature; harvest; heat stress; heat transfer; mathematical model; priority journal; rainy season; rice; South America; tree; air pollutant; atmosphere; crop; environmental monitoring; India; temperature; tree; Asia; Australia; Gangetic Plain; South America; Air Pollutants; Asia; Atmosphere; Australia; Crops, Agricultural; Environmental Monitoring; India; Ozone; South America; Temperature; Trees
来源期刊	Science of the Total Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177272
作者单位	Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, S.A.S Nagar, Manauli PO, Punjab, 140306, India; National Center for Atmospheric Research, Boulder, CO, United States; University of California, Irvine, United States
推荐引用方式 GB/T 7714	Mishra A.K.,Sinha B.,Kumar R.,et al. Cropland trees need to be included for accurate model simulations of land-atmosphere heat fluxes; temperature; boundary layer height; and ozone[J],2021,751.
APA	Mishra A.K..,Sinha B..,Kumar R..,Barth M..,Hakkim H..,...&Sinha V..(2021).Cropland trees need to be included for accurate model simulations of land-atmosphere heat fluxes; temperature; boundary layer height; and ozone.Science of the Total Environment,751.
MLA	Mishra A.K.,et al."Cropland trees need to be included for accurate model simulations of land-atmosphere heat fluxes; temperature; boundary layer height; and ozone".Science of the Total Environment 751(2021).