秦嶺地區(qū)秋季降水的氣候特征分析

doi:10.3969/2012jms.00**

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秦嶺地區(qū)秋季降水的氣候特征分析
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P426.62
基金項(xiàng)目:國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃) ， 中國(guó)科學(xué)院知識(shí)創(chuàng)新工程項(xiàng)目 ， 科技部國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展規(guī)劃(973計(jì)劃) ， 陜西省氣象局科技創(chuàng)新基金

An analysis of climate characteristic of rainfall in Qinling in autumn

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利用1961-2005年觀測(cè)資料和NCEP/NCAR再分析資料, 對(duì)秦嶺鄰近地區(qū)秋季(9-10月) 降水的氣候特征及其與大氣環(huán)流關(guān)系進(jìn)行分析,結(jié)果表明:秦嶺地區(qū)秋季降水具有明顯年代際變化特征, 1960s后期、1970s和1980s初秋季多雨,而1950s和1960s初前期、1980s中后期和1990s秋少雨, 2000年以后秋季降水略有增多.秦嶺地區(qū)秋季雨澇年環(huán)流特征是高原北側(cè)高空西風(fēng)急流偏強(qiáng),烏拉爾山長(zhǎng)波脊穩(wěn)定,西大平洋副熱帶高壓位置偏西,強(qiáng)度偏強(qiáng),對(duì)流層低層?xùn)|南風(fēng)氣流和西南風(fēng)氣流為秦嶺地區(qū)輸送了大量水汽;而少雨干旱年則高空高原北側(cè)西風(fēng)急流偏弱,秦嶺地區(qū)受青藏高壓控制或西北氣流控制,與東亞冬季風(fēng)相聯(lián)系的偏北氣流阻斷了偏南氣流的水汽輸送.

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Using observation data from 1961 to 2003 and NCEP/ NCAR reanalyzed data, this paper investigates climate distribution of precipitation in autumn during Sep. and Dec. in vicinity of Qinling and drought-flood variation as well as its relationship with atmospheric circulation. It is shown that influenced by the terrain of Qinling, the rainfall amount is obviously higher on its southern side than northern side, but the annual variation of precipitation is consistent on both sides. Over recent 50 years, precipitation decreases in autumn in majority of China, precipitation in Qinling indicated an evident similar trend of decrease. In Qinling, the pluvial year of autumn normally features consecutive rain and concentrated large rainfall amount. Generally, a blocking pattern stabilizes in the westerly jet of mid-high latitude, and the subtropical high pressure locates more westward with stronger intensity, while the southeast monsoon is rather strong. However, the atmospheric circulation of a severe drought year represents the domination of Tibetan high pressure or northwest stream in this area. The powerful southward cold air cuts off the transport of water vapor from the southeast monsoon.

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方建剛,侯建忠,陶建玲,李明娟,白愛(ài)娟.秦嶺地區(qū)秋季降水的氣候特征分析.氣象科學(xué),2008,(4):415-420 Fang Jiangang, Hou Jianzhong, Tao Jianling, Li Mingjuan, Bai Aijuan. An analysis of climate characteristic of rainfall in Qinling in autumn. Journal of the Meteorological Sciences,2008,(4):415-420

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