%0 Journal Article
%T Application of an operational two-layer model for soil evaporation and vegetation transpiration retrievals in North China
遥感反演土壤蒸发/植被蒸腾二层模型在华北地区的应用
%A TIAN Jing
%A SU Hong-bo
%A SUN Xiao-min
%A CHEN Shao-hui
%A
田静
%A 苏红波
%A 孙晓敏
%A 陈少辉
%J 地理研究
%D 2009
%I
%X On the basis of an operational two-layer model for estimating soil evaporation and vegetation transpiration, the vegetation transpiration and the soil evaporation during the rapidly growing season of winter wheat in northern China are retrieved using MODIS satellite data and field measurement data from 137 standard meteorological stations. Pixel Component Arranging and Comparing Algorithm and Layered Energy-separating Algorithm are the key components of the model. The former is used for decomposing surface temperature of mixed pixel into soil temperature and vegetation temperature and the latter is used for calculating Bowen-ratio of soil and vegetation, respectively. A surface energy balance method is used to determine the theoretical boundary lines, namely 'true wet/cool edge' and 'true dry/warm edge', in the trapezoid composed of mixed surface temperature and vegetation fractional cover. The variables required for the model mainly include near surface vapor pressure, air temperature, surface resistance, aerodynamic resistance, fractional vegetation cover, surface temperature and net radiation. Also their retrievals are described in the paper. Terrestrial surface heat fluxes measured by the Eddy Correlation system at Yucheng Agro-ecosystem Station are used to validate the estimated results. It shows that the correlation coefficient between the estimated surface available energy and the measured is 0.92 and the root mean squares difference (RMSD) is 30.4w.m-2, the correlation coefficient between the estimated surface evapotranspiration and the measured value is 0.85 and RMSD is 21.3w.m-2. The above differences are mainly caused by: 1) the scale difference between the field measurement and the MODIS observation; 2) the non-closure problem of the surface energy balance from the surface fluxes observations; and 3) the effects of the horizontal and vertical advection on flux measurements.
%K remote sensing
%K soil evaporation
%K vegetation transpiration
%K two-layer model
%K North China Plain
遥感
%K 土壤蒸发
%K 植被蒸腾
%K 二层模型
%K 华北平原
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=869B153A4C6B5B85&jid=C0C75E88BA2EE501C8298896F64A711F&aid=EFCB3B1E8324769E0A80C840B1C86FEA&yid=DE12191FBD62783C&vid=D3E34374A0D77D7F&iid=94C357A881DFC066&sid=F8085F090F1A1511&eid=10F17081942653E7&journal_id=1000-0585&journal_name=地理研究&referenced_num=2&reference_num=23