By using the observed monthly mean temperature and humidity dat, asets of 14 ra- diosonde stations and monthly mean precipitation data of 83 surface station., from 1979 to 2008 over the Tibetan Plateau （TP）, the rel...By using the observed monthly mean temperature and humidity dat, asets of 14 ra- diosonde stations and monthly mean precipitation data of 83 surface station., from 1979 to 2008 over the Tibetan Plateau （TP）, the relationship between the atmospheric water vapor （WV） and precipitation in summer and the precipitation conversion efficiency IPEC） over the TP are analyzed. The results are obtained as follows. （1） The summer WV decreases with increasing altitude, with the largest value area observed in the northeastern part of the TP, and the second largest value area in the southeastern part of the TP, while the northwestern part is the lowest value area. The summer precipitation decreases from southeast to north- west. （2） The summer WV presents two main patterns based on the EOF analysis： the whole region consistent-type and the north-south opposite-type. The north-south opposite-type of the summer WV is similar to the first EOF mode of the summer precipitation and both of their zero lines are located to the north of the Tanggula Mountains. （3） The summer precipitation is more （less） in the southern （northern） TP in the years with the distribution of deficient summer WV in the north while abundant in the south, and vice versa. （4） The PEC over the TP is between 3% and 38% and it has significant spatial difference in summer, which is obviously bigger in the southern TP than that in the northern TP.展开更多
基金National Basic Research Program of China,No.2010CB428505No.2012CB955204+1 种基金R&D Research Development Program of China Special Fund for Public Welfare Industry(Meteorology),No.GYHY200906014Open Lab Foundation of Institute of Plateau Meteorology,CMA,Chengdu,No.LPM201105
文摘By using the observed monthly mean temperature and humidity dat, asets of 14 ra- diosonde stations and monthly mean precipitation data of 83 surface station., from 1979 to 2008 over the Tibetan Plateau （TP）, the relationship between the atmospheric water vapor （WV） and precipitation in summer and the precipitation conversion efficiency IPEC） over the TP are analyzed. The results are obtained as follows. （1） The summer WV decreases with increasing altitude, with the largest value area observed in the northeastern part of the TP, and the second largest value area in the southeastern part of the TP, while the northwestern part is the lowest value area. The summer precipitation decreases from southeast to north- west. （2） The summer WV presents two main patterns based on the EOF analysis： the whole region consistent-type and the north-south opposite-type. The north-south opposite-type of the summer WV is similar to the first EOF mode of the summer precipitation and both of their zero lines are located to the north of the Tanggula Mountains. （3） The summer precipitation is more （less） in the southern （northern） TP in the years with the distribution of deficient summer WV in the north while abundant in the south, and vice versa. （4） The PEC over the TP is between 3% and 38% and it has significant spatial difference in summer, which is obviously bigger in the southern TP than that in the northern TP.
