Comparison of Land–Precipitation Coupling Strength Using Observations and Models

摘要: Abstract Numerous studies have attempted to address the land–precipitation coupling, but scientists’ understanding remains limited and discrepancies still exist from different studies. A new parameter Γ is proposed here estimate coupling strength based on ratio of covariance between monthly or seasonal precipitation evaporation anomalies (from their climatological means) over variance anomalies. The value easy compute insensitive horizontal scales used; however, it does not provide causality. relatively high a necessary—but sufficient—condition for strong coupling. computation values using two global reanalyses (ECMWF NCEP), one regional reanalysis [North American Regional Reanalysis (NARR)], observed along with Variable Infiltration Capacity (VIC)-derived data indicates that stronger in summer weaker win...