摘要
为了评估Met Op-A卫星与Met Op-B卫星ASCAT全球土壤水分产品的差异,更好地利用Met Op-A/B双星联合作业的观测成果,运用统计方法对2013年11月1日至2014年2月28日时间段内Met Op-A/B两颗卫星各自反演的全球土壤水分逐日数据进行了比较,结果表明:1上述时间段内两颗卫星的土壤水分产品的全球土壤水分干湿状况的空间分布不存在大范围差异,且土壤水分变化较大的区域与土壤水分湿区基本重合,变化较小的区域与干区基本重合;2两颗卫星土壤水分差异较大的地区主要是赤道附近地区以及我国新疆和西藏地区;3两颗卫星对土壤水分反映不一致的区域主要包括西亚和北非、赤道附近以及我国的新疆和西藏地区。使用卫星土壤水分反演数据可有效促进土壤水分监测水平的提高,服务于我国农业气象干旱预警和抗旱灌溉决策等,但在将Met Op卫星土壤水分数据引入我国西部地区前,应当先做好该地区卫星数据的评估和订正工作。
To assess the differences in global soil moisture retrieval data from the ASCATs on MetOp-A and MetOp-B satellites, and to better use observation results from MetOp-A ＆ B satellites＇ joint operations, daily global soil moisture retrieval data from MetOp-A ＆ B satellites during the period of November 1, 2013 to February 28, 2014 were compared by using of statistical methods. The results showed that： ① description of soil moisture data two satellites on global soil moisture＇ s central tendency and dispersion degree is basically the same during the above period, and global soil moisture＇s high （low） variable region and wet （dry） region are basic coincide. ② The lar- ger differences areas in soil moisture retrieval value of two satellites are mainly near the equator region and in Chi- na＇ s Xinjiang and Tibet. ③The area where the two satellites＇ reflect on soil moisture trends are consistent mainly includes West Asia and North Africa, the area near the equator and China＇ s Xinjiang and Tibet. Soil moisture sat- ellite retrieval data can effectively promote the level of soil moisture monitoring, and serve in China＇ s agricultural meteorological drought warning and drought irrigation decision-making. But before using the MetOp satellite soil moisture data in the western China, evaluation and revision of satellite data in the area should be the first job.
出处
《科学技术与工程》
北大核心
2014年第35期171-176,共6页
Science Technology and Engineering
基金
美国NOAA NESDIS PSDI项目"Global Soil Moisture Operational Product System (SMOPS)"资助
