中法海洋卫星微波散射计青藏高原土壤水分反演研究  

Study on CSCAT soil moisture retrieval in the Qinghai-Tibet Plateau

作　　者：段潘 赵天杰 郎姝燕[4,5] 姚盼盼 吕海深 彭志晴[3] 白瑜 郑景耀 曾业隆 DUAN Pan;ZHAO Tianjie;LANG Shuyan;YAO Panpan;L Haishen;PENG Zhiqing;BAI Yu;ZHENG Jingyao;ZENG Yelong(The National Key Laboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,China;College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China;Key Laboratory of Remote Sensing and Digital Earth,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100101,China;National Satellite Ocean Application Service,Beijing 100081,China;Key Laboratory of Space Ocean Remote Sensing and Applications,Ministry of Natural Resources,Beijing 100081,China)

机构地区：[1]河海大学水灾害防御全国重点实验室,江苏南京210098 [2]河海大学水文水资源学院,江苏南京210098 [3]中国科学院空天信息创新研究院遥感与数字地球重点实验室,北京100101 [4]国家卫星海洋应用中心,北京100081 [5]自然资源部空间海洋遥感与应用重点实验室,北京100081

出　　处：《海洋气象学报》2024年第4期54-63,共10页Journal of Marine Meteorology

基　　金：国家自然科学基金项目(42201393,42090014)。

摘　　要：中法海洋卫星(China-France Oceanography SATellite,CFOSAT)搭载国际上首个扇形波束旋转扫描微波散射计(CFOSAT SCATterometer,CSCAT),其丰富的观测几何信息为青藏高原土壤水分遥感监测提供了新的机遇。此研究提出了一种有效的适用于CSCAT的土壤水分变化检测算法,不需要复杂机理模型和查找表的构建,利用后向散射系数的变化差值和植被经验函数构建土壤水分反演算法。将变化检测算法反演结果与地面实测结果比较,发现CFOSAT反演结果与实测结果有很好的一致性,表明本算法的精度较高,能够准确反映土壤水分的变化。同时,对青藏高原地区的土壤水分时空分布特征进行分析,发现青藏高原中北部土壤偏干,西部和东南部偏湿,局部区域存在复杂的空间特征,且具有显著的季节性变化。The China-France Oceanography SATellite(CFOSAT)carries the first international fan-beam rotary scanning microwave CFOSAT SCATterometer(CSCAT),whose rich observation geometry information provides new opportunities for remote sensing monitoring of soil moisture on the Qinghai-Tibet Plateau.This study proposes an effective method for detecting the changes in soil moisture applicable to the CSCAT,without the need for modeling complex mechanism and constructing look-up table.The soil moisture retrieval algorithm can be constructed by utilizing the changes in the backscattering coefficient difference and the vegetation empirical function.Through comparing the retrieval results of the detection algorithm and the ground measured results,it is found that the CFOSAT retrieval results are in good agreement with the measured results,and it shows that this algorithm has high accuracy and can accurately reflect the changes in soil moisture.Meanwhile,the analysis of the spatial and temporal distribution characteristics of the soil moisture in the Qinghai-Tibet Plateau reveals that the soil is dry in the northern-central part of the plateau and wet in the western and southeastern parts with complex spatial characteristics in localized areas,and the soil moisture is characterized with significant seasonal variations.

关 键 词：中法海洋卫星(CFOSAT) 青藏高原 后向散射系数 变化检测 土壤水分 

分 类 号：TP722.6[自动化与计算机技术—检测技术与自动化装置]