Seasonal Process of Snow Cover Subseasonal Variability on the Qinghai-Tibet Plateau
Abtract:The characteristics of snow cover subseasonal variability and its relationship with the temperature and precipita-tion were analyzed based on the snow cover data of the interactive multi-sensor snow and Ice Mapping System(IMS),the surface temper-ature data of the ERA-Interim reanalysis data,and the grid precipitation data provided by the US CPC(Climate Prediction Center).It is found that snow cover on the Qinghai-Tibet Plateau varies more obviously with seasons.The snow cover rate is the highest in winter,fol-lowed by spring and autumn,and the smallest in summer.The intra-seasonal variation process of snow cover is that the active area reaches the maximum in January,and then gradually decreases,and the minimum in summer,and the transition season in spring and autumn.The intra-annual difference of the average temperature on the Qinghai-Tibet Plateau is about 20℃,and the average temperature in January is the lowest,and shows the distribution characteristics of high in the south and low in the north.The temperature has a great influence on the distribution of snow cover on the Qinghai-Tibet Plateau.When the standard deviation of temperature change is large,the subseasonal vari-ability of snow cover is also large,and the spatial distribution of the two is similar.Precipitation has little effect on the subseasonal vari-ation of snow cover over the Qinghai-Tibet Plateau,and there is no obvious correlation between them.
NETL
NSTL
万方数据
