Temporal and spatial variability of the global water balance

摘要: An analysis of simulated global water-balance components (precipitation [P], actual evapotranspiration [AET], runoff [R], and potential [PET]) for the past century indicates that P has been primary driver variability in R. Additionally, since about 2000, there have increases P, AET, R, PET most globe. The R during 2000 through 2009 occurred despite unprecedented PET. are result substantial cool Northern Hemisphere months (i.e. October March) when were relatively small; largest warm (April September). period, latitudinal distribution departures appears to co-vary with mean from 16 climate model projections response warming, except high latitudes. Finally, changes variables appear large perspective long-term means. However, put into context magnitudes raw water balance variable values, little change any over on a or hemispheric scale.