AMSR-E卫星反演土壤湿度与ECWMF、NECP再分析土壤湿度比较分析

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

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)。

Soil moisture is an important environmental factor and procedure parameter in fields of meteorolo gy and climatology. Global and sequential products of satellite retrieval soil moisture were provided by AM SR-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 men tioned 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 big ger 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 mois ture 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.