生态环境学报Issue(6)：1001-1008,8.
基于遥感-过程耦合模型的地表蒸散量应用研究
Research of land surface evapotranspiration based on remote sensing process coupling model BEPS
摘要
Abstract
As an important processes of the land and atmosphere interaction in land surface process, evapotranspiration (ET) plays an key role in the biosphere, atmosphere and hydrosphere. In this paper, the remote sensing process coupling model BEPS was used. The main inputs were the Moderate Resolution Imaging Spectroradiometer (MODIS) data and the NCEP/NCAR reanalysis datas. We simulated and analyzed land surface evapotranspiration of the United States from 2007 to 2009. Meanwhile, the flux observation data of AmeriFlux was used to verify the reliability and applicability of the model in evapotranspiration simulation The results show that:the correlation coefficient of the land surface evapotranspiration between the BEPS model and the measured data was 0.729 7 (P<0.05), which mean that BEPS model could be well used in simulating the evapotranspiration in America. ET showed a single peak trend obviously within a year, which value was high from May to Septembe and more than 60 mm·mon-1. The minimum value was 8.39 mm·mon-1 in January, while maximum value was 18.04 mm·mon-1 in July. And the annual evapotranspiration was 505 mm·a-1. Influenced by topography, climate and evapotranspiration, the southern region mainly covered by grassland and farmland had the highest value, where annual evapotranspiration was generally above 600 mm·a-1 and the highest value was 1 667 mm·a-1. Annual evapotranspiration was 400-600 mm·a-1 in north-central area and Eastern area. The value of evapotranspiration in the western area where vegetation types were woodland and mixed forest., presented to be lowest among all area in America, which annual evapotranspiration was less than 400 mm·a-1. What's more, the value of precipitation minus ET showed a decreasing trend from eastern area to western area, which minimum value was mainly distributed in the western desert. The ratio of ET and precipitation was 0.72 increased from east to west, and reached the maximum value in western and north-central area.关键词
遥感/地表蒸散发/BEPS模型/美国/通量观测数据Key words
remote sensing/land surface evapotranspiration/BEPS Model/america/flux observation data分类
天文与地球科学引用本文复制引用
吴荣军,葛琴,詹习武,关福来,姚树然..基于遥感-过程耦合模型的地表蒸散量应用研究[J].生态环境学报,2013,(6):1001-1008,8.基金项目
国家“十二五”科技支撑计划 （）
