• 遥感技术与应用 , 2013,Vol.28(4)
  • AMSR-E卫星反演土壤湿度与ECWMF,NECP再分析土壤湿度比较分析
  • 李昂1    陆其峰2    杨晓峰2    张建伟2   
  • (1.南京信息工程大学,江苏 南京 210044;2国家卫星气象中心,北京 100081)
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摘要:

土壤湿度是气象学、气候学研究领域的重要环境因子和过程参数。AMSR-E可提供全球范围的较长时序的卫星反演土壤湿度产品,将ECWMF和NECP再分析资料与AMSR-E土壤湿度产品进行时空比较,在评价三者一致性的同时对AMSR-E土壤湿度进行检验,并进一步使用站点观测资料(土壤湿度、降水量)对中国区域的AMSR-E、ECWMF以及NECP土壤湿度进行检验。结果表明:全球及中国区域AMSR-E、ECWMF与NECP土壤湿度空间分布特征一致性较好,但与ECWMF、NCEP相比AMSR-E土壤湿度在数值上明显偏小,尤其当AMSR-E土壤湿度数值较小时,与另两者的差距较大;三者土壤湿度均与降水量有较好的对应关系,比较而言,ECWMF和NECP土壤湿度与降水量的对应关系更好;与站点土壤湿度相比,ECWMF和NECP土壤湿度偏大,AMSR-E土壤湿度偏小,全国范围内2009年159个站点统计结果显示:ECWMF、NECP与站点的均方根误差(0.107、0.124)小于AMSR-E的均方根误差(0.127)。

关键词: AMSR-E   土壤湿度   ECWMF   NECP  

基金:

气象行业专项(GYHY201106014,GYHY201206002)和国家自然科学基金项目(40705037)支持。

 

 

AMSR-E Soil Moisture Compared with ECWMF and NECP Soil Moisture

Li Ang   Lu Qifeng   Yang Xiaofeng   Zhang Jianwei  

(1.Nanjing University of Information Science&Technology,Nanjing 210044,China;   2.National Satellite Meteorological Center,Beijing 100081,China)  

Abstract:

Soil moisture is an important environmental factor and procedure parameter in fields of meteorology and climatology.Global and sequential products of satellite retrieval soil moisture were provided by AMSR-E.In this study,ECWMF and NECP reanalysis data and AMSR-E soil moisture were compared in time and space,the AMSR-E soil moisture was verified with consistency evaluation of three methods which mentioned above and the AMSR-E,ECWMF and NECP soil moisture in China were confirmed by observation data,such as soil moisture and precipitation.The result indicated that AMSR-E,ECWMF and the NECP soil moisture spatial distribution characteristics in globe or China have good consistency,but AMSR-E soil moisture was smaller than the others,especially when the value of the AMSR-E was low,the gap was bigger between them;Besides,the soil moisture and precipitation have perfect corresponding relation and there was better the corresponding relation between ECWMF and NECP relatively;Compared with the soil moisture of observation stations,ECWMF and NECP soil moisture was larger and AMSR-E soil moisture was smaller.Furthermore,the root mean square errors of ECWMF,NECP and observation station were all smaller than AMSR-E during 1 645 times data which acquired on a national scale.

Keywords: NECP   Soil Moisture   ECWMF   AMSR-E