Cryosphere and Hydrology
Objectives: The main objective is to assess the remotely sensed products of key cryospheric and hydrological elements (snow, evapotranspiration, soil moisture and precipitation) in representative regions, which will be achieved through the following sub-objectives: • Establishing an observation network for snow, evapotranspiration, soil moisture and precipitation in representative regions selected in Europe and China (WP1); • Validation of snow products (WP2); • Validation of evapotranspiration products (WP3); • Validation of soil moisture products (WP4); • Validation of precipitation products (WP5). Methods: Remotely sensed products will be evaluated by referencing ground-based observations. The ground-based measurements will be upscaled to match the remote sensing pixel for validating products within the observation network. The validated products will be inter-compared with other gridded products, and the spatiotemporal trends are diagnosed by statistical indexes, e.g., RMSE and correlation coefficient. Finally, the regional and temporal feasibility of each product will be further evaluated based on the datasets in different landscapes, topographic conditions in the representative regions selected in China and Europe. Deliverables: •Datasets collected from the observation network, mainly including the snow, evapotranspiration, soil moisture and precipitation (WP1); • Evaluation of remotely-sensed snow products, including GlobSnow SWE and snow cover extension, MODIS/AVHRR snow cover area/fraction, NASA AMSR-E SWE, IMS snow cover and FY SWE products (WP2); • Evaluation of remotely-sensed evapotranspiration products in typical ecosystems, such as GLEAM, ETMonitor and MODIS-ET products (WP3); • Evaluation of remotely-sensed soil moisture products, such as SMOS, ESA-CCI, ASCAT, FY-3C, SMAP, LPRM and AMSR-E/2 (WP4); • Evaluation of remotely-sensed precipitation products, mainly including GPM_IMERG, GSMaP, TRMM3B42, CMPA and PERSIANN-CCS (WP5). Source of Funding: • The Strategic Priority Research Program of Chinese Academy of Sciences (Grant no: XDA19070101) • The Science and Technology Basic Resources Investigation Program of China (Grant no. 2017FY100501)
