摘要: How much water is exchanged between the atmosphere and land ocean surfaces every year? The answer important for developing accurate models of Earth's cycle both now in a warmer future climate. Good et al. recently reported high-resolution data on hydrogen isotopes from Tropospheric Emissions Spectrometer (TES) aboard NASA's Aura satellite ( 1 ). On page 175 this issue, Good, Noone, Bowen 2 ) use these to estimate global values plant transpiration, streamflow, evaporation various sources.