基于MOD16数据的天津市蓟州区ET敏感性因子分析

The Sensitivity Analysis of Evapotranspiration Factors in Jizhou of Tianjin Based on MOD16 Data

利用MOD16日蒸散发产品数据,对影响天津市蓟州区日蒸散发的遥感因素和气象因素进行相关性分析和敏感性分析。研究结果表明:研究区域日蒸散发与气象要素之间存在一定的滞后效应,蒸散发与气象因子之间的滞后时间呈现明显的季节性分布,滞后时间在生长盛季更长。蒸散发的峰值滞后于光和有效辐射,提前于气温、相对湿度和饱和水汽压差。就遥感参数而言,MOD16数据蒸散发与净辐射通量敏感性最高,其次为地表温度、地表导度和高程因子。

In this paper,the correlation and sensitivity analysis of remote sensing factors and meteorological factors affecting daily evapotranspiration in Jizhou District of Tianjin were analyzed by using MOD16 daily evapotranspiration product data.The results show that:there is a certain lag effect between daily evapotranspiration and meteorological factors,and the lag time between evapotranspiration and meteorological factors presents obvious seasonal distribution,and the lag time is larger in the growing season.The peak value of evapotranspiration lags is behind light and effective radiation,and ahead of air temperature,relative humidity and saturated vapor pressure difference.For remote sensing parameters,the sensitivity of evapotranspiration and net radiation flux of MOD16 data is the highest,followed by surface temperature,surface conductivity and elevation factor.