西南低渦活動特征的再分析

doi:10.3969/2014jms.0039

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西南低渦活動特征的再分析
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                        10.3969/2014jms.0039
                    
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基金項目:國家重點基礎(chǔ)研究發(fā)展計劃(973計劃)項目(2013CB430202); 高原大氣與環(huán)境四川省重點實驗室開放課題(PAEKL-2013-C3); 國家自然科學(xué)基金資助項目(91667109;41305080);公益性行業(yè)(氣象)科研專項(201406001)

Characteristics reanalysis on Southwest vortex

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用1979—2012年每天4次,1°×1°的ERA-INTERIM再分析資料,從風(fēng)場角度定義了閉合式氣旋環(huán)流和規(guī)定了低渦移出路徑的統(tǒng)計方法后,對西南低渦的活動特征進(jìn)行了統(tǒng)計分析。結(jié)果表明:西南低渦平均每年生成個數(shù)為59個,偏多的年份為1980、1989、1992、1997和2009年,平均可達(dá)69個;偏少的年份為1981、1990、1996和2006年,平均僅有51個。低渦在春季生成的個數(shù)最多,夏季次之,秋、冬季最少。6月和3月生成的個數(shù)最多;5月次之,其中11月生成的個數(shù)最少。各季節(jié)移出型低渦的個數(shù)則是夏季最多,春季次之,秋季和冬季最少。就移出率而言,夏季達(dá)44.1%,春季為27.6%,秋季為22.6%,冬季僅為11.3%。春、秋、冬季基本為短生命史的低渦,而在夏季,生命史長的低渦所占的比例較高。34 a中夏季維持較長生命史的移出型低渦共有126個,分別向東北(最多)、正東、東南(最少)3個方向移動,除正東方向外,向東北和東南方向移動的低渦個數(shù)隨年代際變化呈增加的趨勢。

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Based on the ERA-INTERIM reanalysis data with 6 h time resolution and 1°×1° spatial resolution from 1979 to 2012, the characteristics of the Southwest vortex were statistically analyzed after defining the closed cyclone circulation and setting up the statistic method of the vortex removement routine according to wind field. Result showed that 59 Southwest vortexes generated annually. There were more Southwest vortexes with the average value 69 in 1980,1989,1992,1997 and 2009, while in 1981,1990,1996 and 2006 there were less with the average value 51.The vortex generated the most in spring, then in summer, and the least was in autumn and winter.The maximum of vortex generated in June and March, followed by May, and November had the least. The number of removing vortex fluctuated in each season. Removing rate in summer, spring, autumn and winter were 44.1%, 27.6%, 22.6% and 11.3%, respectively. The short-life vortex occured basically in spring, autumn and winter, while in summer, the long-life vortex had a higher occurring proportion. Among 126 removing vortexs with long-life occurred in summer during 34 years, more of them moved to northeast than to east and southeast. The number of removing vortex shifting to the northeast and southeast increased with decadal variability.

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王金虎,李棟梁,王穎.西南低渦活動特征的再分析.氣象科學(xué),2015,35(2):133-139 WANG Jinhu, LI Dongliang, WANG Ying. Characteristics reanalysis on Southwest vortex. Journal of the Meteorological Sciences,2015,35(2):133-139

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收稿日期:2014-03-12
最后修改日期:2014-08-28
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在線發(fā)布日期: 2015-05-08
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