Examination of water budget using satellite products over Australia

摘要: Large-scale water balance in the Australian continent is examined over an 8-year period (2003–2010) with three commonly used satellite based cycle components: precipitation (P) from Tropical Rainfall Measuring Mission (TRMM), evapotranspiration (ET) Moderate Resolution Imaging Spectroradiometer (MODIS), and terrestrial storage change (ΔS) Gravity Recovery Climate Experiment (GRACE). First we evaluate using products areas limited annual streamflow to eliminate influence of runoff analysis. We observe more frequent better closure consistency components central part Western Australia, where low precipitation, high elevation relief exist. The data are coherent at seasonal scales compared monthly scale. Application Lake Eyre Basin (an internal drainage system) suggests a maximum 6.2 mm/year groundwater inflow basin, which consistent regional flow direction area. This result also indicates that absolute integrated error combination should be smaller than 6.2 mm/year, about 2.1% basin. If this relative assumed for whole continent, calculation results 144.7 ± 11.3 mm/year estimated total surrounding oceans during study period. found estimate comparable estimates 50–150 mm/year Bureau Meteorology National Water Commission.