台湾地区蒸散发的遥感估算与时空分析  

Estimation and Time-space Analysis of the Regional Evapotranspiration Using Quantitative Remote Sensing in Taiwan Region

作　　者：占车生[1] 李玲[2] 王会肖[2] 赵洁[2] 

机构地区：[1]中国科学院地理科学与资源研究所陆地水循环与地表过程重点实验室,北京100101 [2]北京师范大学水科学研究院,北京100875

出　　处：《遥感技术与应用》2011年第4期405-412,共8页Remote Sensing Technology and Application

基　　金：国家自然科学基金项目(40901023)

摘　　要：在地表能量平衡系统(SEBS)基础上,改进了SEBS的地表动量粗糙度、零平面位移及植被高度等参数化方案,并建立适合台湾地区的气温和地表温度相关性模型,构建了改良的定量遥感蒸散模型SEBS-China。选取台湾地区2002年和2003年4季各一晴空代表日,利用MODIS数据模拟了日均实际蒸散发。模拟结果较实测蒸发皿蒸发量偏小,与实际规律相符。分析模拟结果表明:台湾地区的太阳净辐射量、蒸发比和地表蒸散发量在时间分布上呈现出变化分明的年内分布规律:夏秋季比春冬季高,其中7月最大、1月最小。时间上,2002年4个代表日的模拟值普遍高于2003年的4个代表日。在空间上,高值区位于中部山区,并向东西两侧逐渐降低到沿海地区又略有回升。不同土地覆被类型的平均蒸散发量由大到小依次为森林、草地、水体、裸地、城镇建设用地;各行政区陆面蒸散发分布呈现城市明显低于区县的规律。The actual ET was simulated in this study to estimate and analyse the time-space distribution of ET in TaiWan.The study improved the scheme of look-up table of monthly roughness length,zero plane displacement and vegetation height related with land covers based on the surface energy balance system（SEBS）,and set up the simple correlation between land surface temperature and air temperature in Taiwan.Then,a modified quantitative remote sensing ET model,SEBS-China model,was developed based on SEBS model.The SEBS-China model simulated the actual ET by using meteorological data of 8 selected dates in year 2002 and 2003 with MODIS data.Comparing to the Pan ET,the modeling values are slightly lower,which is consistent with the fact that Pan ET is potential ET,should be higher than actual ET.Based on the results,several analyses are made to deeply understand the characters of the ET in Taiwan Region.Namely,there is an obvious tendency in the temporal and spatial distribution of Rn,EF and ET,namely,the values of the three parameters are higher in central mountain areas,and reduce gradually to the east and west.Through a year,the ET is the highest in July,and lowest in January.According to different land surface cover,the ET is different;generally,the land cover from high to low is forest,grass,water,bare land and urban area.Comparing to the rural areas,ET of cities is much lower.

关 键 词：区域蒸散发 定量遥感 SEBS模型 台湾地区 

分 类 号：P426.2[天文地球—大气科学及气象学] TP79[自动化与计算机技术—检测技术与自动化装置]