2003~2012年高原低涡活动特征统计分析

Statistical Analysis on the Tibetan Plateau Vortex Activity Characteristics from 2003 to 2012

摘要: 本文以高原低涡资料为基础，统计分析了2003~2012年高原低涡的活动规律，结果表明：高原低涡主要生成于高原东部，生涡高频区主要分布在唐古拉山、杂多、德格、曲麻莱和柴达木五个地区。移出高原的高原低涡主要生成于高原东部，高原移出低涡高频生成源地在曲麻莱最为集中。高原低涡出现次数的年际变化在2003~2009年呈明显增加趋势，2010年出现转折次数减少，2011~2012年继续增加。高原低涡集中出现在每年的4~9月，其中6月份最多。93.0%的高原低涡持续时间在60h以内。随着持续时间的增加，高原低涡的出现次数显著减少。高原移出低涡的路径主要集中在东北、东南、东三个方向，移入的地区主要分布在甘肃、四川、陕西和宁夏四个地区。

Abstract: Abstract: In this paper, based on the Tibetan Plateau vortex data, we investigated the Tibetan Pla-teau Vortex Activity Characteristics from 2003 to 2012. The results showed that: Tibetan Plateau vortex generated in eastern plateau and was concentrated in Tanggula Mountains, Zaduo, Dege, Qumalai and Qaidam. The Tibetan Plateau vortex which was moving out of the plateau mainly generated in eastern plateau and was concentrated in Qumalai. The Tibetan Plateau vortex oc-currences obviously increased from 2000 to 2009 on the whole, reduced in 2010 and continued to increase from 2011 to 2012. The Tibetan Plateau vortex occurrences were concentrated from April to September every year, the most in June. 93.0% of the vortex duration was within 60 h. With the increase of the duration, the Tibetan Plateau vortex occurrences reduced significantly. The Tibetan Plateau vortex which was moving out of the plateau mainly included three routes: northeast, southeast, and east. The districts into which the Tibetan Plateau vortex moved were mainly distributed in Gansu, Sichuan, Shaanxi and Ningxia.