Regional hydrologic response to climate change in China

摘要

In recent years, climate change has affected regional evaporation. On the one hand, actual evaporation (E) on the long time scale is primarily controlled by the available energy and water, which can be expressed as a function of potential evaporation Eo and precipitation P i.e. the mean annual water-energy balance equation. On the other hand, due to the feedback of atmosphere on land surface, changes of E will lead to changes of atmospheric state, which means an alteration of Eo. This was expressed as the complementary relationship between actual and potential evaporations. In this study, we combined the mean annual water-energy balance equation and the complementary relationship to establish a model evaluating regional hydrologic response to climate change. Based on meteorological data from about 700 stations in China during the period 1961-2005, we analyzed change of net radiation, precipitation, and air temperature and evaluated regional change of E, as well as the dominant climatic factors controlling E.