NASA SMERGE Project

Smerge-Noah-CCI root zone soil moisture 0-40 cm L4 daily 0.125 x 0.125 degree V2.0 is a multi-decadal root-zone soil moisture product. Smerge is developed by merging the North American Land Data Assimilation System (NLDAS) land surface model output with surface satellite retrievals from the European Space Agency Climate Change Initiative. The data have a 0.125 degree resolution at a daily time-step, covering the entire continental United States and spanning nearly four decades (January 1979 to May 2019). This data product contains root-zone soil moisture of 0 - 40 cm layer, Climate Change Init...Smerge-Noah-CCI 0-40厘米根区土壤湿度L4日尺度0.125°×0.125°版本2.0是一款多十年级根区土壤湿度产品。该数据集通过融合北美陆面数据同化系统（North American Land Data Assimilation System, NLDAS）的陆面模式输出结果与欧洲空间局气候变化倡议（European Space Agency Climate Change Initiative, CCI）的地表卫星反演数据研发得到。其空间分辨率为0.125°，时间步长为日尺度，覆盖美国本土全境，时间跨度近四十年（1979年1月至2019年5月）。本数据集包含0-40厘米土层的根区土壤湿度，相关内容隶属于气候变化倡议（Climate Change Init...）。