Study of Surface Dry and Wet Conditions in Southwest China in Recent 50 Years
Using the monthly measurements during 1961 to 2011 of 113 meteorological stations in Southwest China,the potential evapotranspiration and aridity index were calculated with the Penman-Monteith model and then the characteristics of spatial-temporal change of surface dry and wet conditions in Southwest China in recent 50 years are discussed.The results show that the dry and wet conditions in Southwest China are spatially uneven with a characteristic named "humid east and arid west" while they are moist as a whole.The climate dry and wet conditions tend to be hotter and drier in this area in recent 50 years and are growing more serious in the last 12 years.The climate dry and wet condition of summer is the moistest in four seasons while it is the driest in winter.There are two time points where the climate dry and wet conditions changed abruptly in Southwest China in the past 50 years.One is around 1992 when it tends to be moist and the other is around 2002 when it becomes dryer instead of moister.Precipitation plays a dominant role in the climate dry and wet conditions of Southwest China region meanwhile the factors such as sunshine duration and relative humidity also have a significant impact on them.
climate changedry and wet conditionsPenman-Monteith modelSouthwest China
NETL
NSTL
万方数据
维普
