基于MODIS产品影像及陆面能量平衡系统(SEBS)的河北平原区域蒸散估算(英文)  

Regional Evapotranspiration Estimation Based on MODIS Products and Surface Energy Balance System(SEBS) in Hebei Plain,Northeastern China

作　　者：蔺文静[1] 苏中波[2] 董华[1] 陈立[1] 王贵玲[1] 

机构地区：[1]中国地质科学院水文地质环境地质研究所,河北石家庄050061 [2]International Institute for Geo-Information Science and Earth Observation(ITC)

出　　处：《遥感学报》2008年第4期663-672,共10页NATIONAL REMOTE SENSING BULLETIN

基　　金：Remote sensing based regional groundwater recharge estimation,IHEG Science Foundation for Young Scholars(No.SK200606).

摘　　要：地表蒸散是区域水文循环的重要组成部分之一,传统的地表蒸散估算一般基于点上的气象观测数据,当用于区域地表蒸散评价时,具有一定的局限性。随着遥感技术的发展,利用遥感影像能够对大区域进行观测的优势进行区域地表蒸散估算已成为可能。地表能量平衡系统(SEBS)是根据地表能量平衡估算地表蒸散量的一种方法,该方法由于提出了地表能量传输过程中关键制约因素热传导粗糙度的估算模型而在遥感蒸散计算方面具有较高的精度。本文在SEBS模型的基础上,以河北平原为例,采取中分辨率成像光谱辐射仪(MODIS)产品影像,根据研究区下垫面的实际情况进行了参数估算,进行了区域实际蒸发蒸腾量计算及模型精确度评价,并在SEBS模型的基础上,提出了新的"标准化温度差-反照率"特征空间分析方法,对研究区内地表土壤水分现状进行了评价;最后,对河北平原地表蒸散时空分布进行了分析。计算结果表明,在所选取的晴空乌云条件下,根据SEBS模型计算所得的地表蒸散与研究区内利用大型承重式蒸渗仪所测量的地表实际蒸散量具有很好的一致性,说明SEBS模型在遥感蒸散计算方面据有较高的可信度。然而,由于地表蒸散的遥感估算是以所获取的遥感影像单元为基础,计算误差不可避免,尤其是使用低分辨率遥感影像的时候,每个影像单元所反映的地表蒸散为单元内各种地表覆盖的综合反映,当与只反映一种地表覆盖蒸散的大型承重式蒸渗仪测量结果进行比较时,误差是显而易见的,因此,若着重考虑模型精度验证,尚需在以后的研究中考虑使用高分辨率的遥感影像。地表土壤水分或湿度状况是地表能量交换及蒸散发生的主要控制因素。利用地表温度与植被指数的关系对区域地表湿度状况进行监测在实践中被广泛利用,然而,由于不用地区地表属性的千差万别,当利用�Daily regional evapotranspiration in Hebei Plain has been estimated based on the remote sensing data as well as the Surface Energy Balance System(SEBS) in this study.The Surface Energy Balance System(SEBS) model was developed to estimate land surface fluxes using remotely sensed data and available meteorological observations.It has the most important advantage of its inclusion of a physical model for the estimation of the roughness height for heat transfer which is the most critical parameter in the parameterization of the heat fluxes of land surface.In this paper,SEBS has been utilized to estimate the surface fluxes over Hebei Plain in Northeastern China by using MODIS/TERRA products,in combination with meteorological data collected in meteorological stations distributed over the study area.The estimated daily evapotranspiration by SEBS in cloud free days are first compared with measurements by the large weighing lysimeter in Luancheng Agro-Ecosystem Station(LAES).The comparisons show that the estimated evapotranspiration from SEBS have a good agreement with the ground truth data.Based on the validation of the model,a modified version of SEBS is utilized to analysis the soil moisture status over the study area and the spatial-temporal distributions of actual evapotranspiration were analyzed by combination of the up-to-date land cover map in Hebei Plain.

关 键 词：蒸散 遥感 地表能量平衡系统(SEBS) 土壤水分 

分 类 号：P412.13[天文地球—大气科学及气象学]