青藏高原东部及东侧地区低值系统与高原积雪的相关研究

Correlation Reseach between Low-Pressure Systems on the East Side of Qinghai-Xizang Plateau and Snow Cover over Plateau

在普查青藏高原东部1960—1998年6～8月700hPa天气图上低值系统出现次数的基础上,将其进行多种组合,将组合的资料与青藏高原冬春积雪资料进行同步相关分析,再将通过显著性水平α=0.01检验的几组资料,用墨西哥帽子波进行计算。对比这些不同时间尺度的子波系数,得到了一些有益的结果,它反映出低值系统与高原积雪间有密切关系。

Based on investigation into the frequency of low\|pressure systems on synoptic map of 700 hPa on the east side of Qinghai\|Xizang Plateau during June to August 1960\_1998, we make them up multi\|combinately. The synchro correlation analysis is done between the combinated data and the snow cover over Qinghai\|xizang Plateau from winter to spring. After that, the several combinated data which have pass the significance level test of α=0.01 and are calcutated with Mexican Hat wavelet. Comparing with these wavelet coefficient on different time scales show there is close relationship between low\|pressure systems and snow cover over Qinghai\|Xizang Plateau.