Long‐term trends in evapotranspiration and runoff over the drainage basins of the Gulf of Mexico during 1901–2008

摘要: [1] The Gulf of Mexico (GOM) is facing large pressures from environmental changes since the beginning last century. However, magnitude and long-term trend total water discharge to GOM underlying processes are not well understood. In this study, dynamic land ecosystem model (DLEM) has been improved applied investigate spatial temporal variations evapotranspiration (ET) runoff (R) over drainage basins during 1901–2008. Modeled ET were evaluated against upscaled data sets gauge observations. Simulated results demonstrated a significant decrease in at rate 15 mm yr−1 century−1 an insignificant runoff/precipitation (R/P) river whole region trends estimated fluxes show substantial heterogeneities across study region. Generally, west arid area, ET, R, R/P decreased; while they increased eastern part area 108 years. recent 30 years, experienced R. Factorial simulation experiments indicate that climate change, particularly P, was dominant factor controlling interannual R; use change had same effects on as did. To eliminate modeling uncertainties, high-resolution historical meteorological parameterizations anthropogenic effects, such dam constructions, should be developed.