基于不同资料的青藏高原降水量变化特征分析

Temporal and Spatial Characteristics of Precipitation in the Tibetan Plateau Based on Different Data

本文利用1979~2007年APHRODITE、CMAP、CRU和台站降水数据,采用了小波分析方法,对我国青藏高原降水量变化特征进行了分析,并进一步研究了使用四种不同资料对高原降水量的影响。研究结果表明:在降水时间变化特征上,APHRODITE、CRU和台站降水数据对降水小波分析中表现得较为相似,而CMAP数据与其他数据存在较大的差异。空间分布特征上,APHRODITE、CRU和台站降水数据对降水分布、变化趋势以及年代间变化表现得较为一致,而CMAP数据与其余数据表现存在明显差异。综上可知,CMAP数据在分析中于较多方面都表现出了与其余三种数据的差异,因此,使用CMAP数据对青藏高原降水进行分析时应注意进行修正。

In this paper, using the data of APHRODITE, CMAP, CRU and station precipitation from 1979 to 2007, the wavelet analysis method was used to analyze the variation characteristics of precipitation in Qinghai-Tibet Plateau, and the influence of four different data on plateau precipitation was further studied. The results show that APHRODITE, CRU and station precipitation data are similar in precipitation wavelet analysis, but there is a big difference between CMAP data and other data. In terms of spatial distribution characteristics, APHRODITE, CRU and station precipitation data are more consistent with water-reducing, changing trends and inter-decadal changes, while CMAP data is significantly different from other data. In summary, CMAP data shows differences with the other three data in many aspects of analysis. Therefore, the use of CMAP data to analyze the precipitation on the Tibetan Plateau should be corrected.