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题名: The effects of clouds and aerosols on net ecosystem CO2 exchange over semi-arid Loess Plateau of Northwest China
作者: Jing, X; Huang, J; Wang, G; Higuchi, K; Bi, J; Sun, Y; Yu, H; Wang, T
收录类别: SCIE
出版日期: 2010
刊名: ATMOSPHERIC CHEMISTRY AND PHYSICS
卷号: 10, 期号:17, 页码:8205-8218
出版者: COPERNICUS GESELLSCHAFT MBH
出版地: GOTTINGEN
英文摘要: The impacts of clouds and atmospheric aerosols on the terrestrial carbon cycle at semi-arid Loess Plateau in Northwest China are investigated, by using the observation data obtained at the SACOL (Semi-Arid Climate and Environment Observatory of Lanzhou University) site. Daytime (solar elevation angles of larger than 50A degrees) net ecosystem exchange (NEE) of CO2 obtained during the midgrowing season (July-August) are analyzed with respect to variations in the diffuse radiation, cloud cover and aerosol optical depth (AOD). Results show a significant impact by clouds on the CO2 uptake by the grassland (with smaller LAI values) located in a semi-arid region, quite different from areas covered by forests and crops. The light saturation levels in the canopy are low, with a value of about 434.8 W m(-2). Thus, under overcast conditions of optically thick clouds, the CO2 uptake increases with increasing clearness index (the ratio of global solar radiation received at the Earth surface to the extraterrestrial irradiance at a plane parallel to the Earth surface), and a maximum CO2 uptake and light use efficiency of vegetation occur with the clearness index of about 0.37 and lower air temperature. Under other sky conditions, CO2 uptake decreases with cloudiness but light use efficiency is enhanced, due to increased diffuse fraction of PAR. Additionally, under cloudy conditions, changes in the NEE of CO2 also result from the interactions of many environmental factors, especially the air temperature. In contrast to its response to changes in solar radiation, the carbon uptake shows a slightly negative response to increased AOD. The reason for the difference in the response of the semi-arid grassland from that of the forest and crop lands may be due to the difference in the canopy's architectural structure.
作者部门: [Jing, X. ; Huang, J. ; Wang, G. ; Bi, J. ; Sun, Y. ; Yu, H. ; Wang, T.] Lanzhou Univ, Coll Atmospher Sci, Minist Educ, Key Lab Semiarid Climate Change, Lanzhou 730000, Peoples R China ; [Higuchi, K.] Environm Canada, Adaptat & Impacts Div, Toronto, ON, Canada
通讯作者: Huang, J (reprint author), Lanzhou Univ, Coll Atmospher Sci, Minist Educ, Key Lab Semiarid Climate Change, Lanzhou 730000, Peoples R China.
学科分类: Meteorology & Atmospheric Sciences
文章类型: Article
所属项目编号: Lanzhou University ; National Science Foundation of China [40725015, 40633017] ; National Basic Research Program of China [2006CB400501]
所属项目名称: 国家自然科学基金项目 ; 国家重点基础研究发展计划以及国家重大科学研究计划(973计划)
项目资助者: NSFC ; MOST ; LZU
语种: 英语
DOI: 10.5194/acp-10-8205-2010
ISSN号: 1680-7316
WOS记录号: WOS:000281845800007
第一机构:
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/119193
Appears in Collections:大气科学学院_期刊论文

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Recommended Citation:
Jing, X,Huang, J,Wang, G,et al. The effects of clouds and aerosols on net ecosystem CO2 exchange over semi-arid Loess Plateau of Northwest China[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2010,10(17):8205-8218.
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