Effects of water table dynamics on regional climate: A case study over east Asian monsoon area

摘要: [1] Groundwater is an important component of the hydrologic cycle, and its anomaly will result in variations soil moisture, water, energy balances between land surface atmosphere, which ultimately influence climate. In this study, we implement a groundwater model into regional climate RegCM3, called RegCM3_GW, investigate effects water table dynamics on Numerical experiments by RegCM3_GW RegCM3 over east Asian monsoon area show that incorporating reduces systematic biases simulated precipitation 38.5% 39.8% semiarid humid regions, respectively, increases bias slightly 5.6% semihumid regions. To seek reasons for differences precipitation, analyze atmospheric vapor budget local cycle among table, evapotranspiration (ET), convective precipitation. It found top root zone layers become wetter enhance bare evaporation but do not always increase transpiration. Because each ET’s component, obvious enhancements ET occur regions contribute to more instable profiles pseudoequivalent potential temperature. The moisture analysis indicates recycling rate efficiency greatly presents aquifer-atmosphere feedback, while transport control development Therefore, consist interaction changes circulation originated from ambient interaction, latter factor plays role area. Sensitivity results change convection parameterization also explored.