春季青藏高原大氣熱源與長(zhǎng)江中下游盛夏高溫的關(guān)系

doi:10.3969/2015jms.0062

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春季青藏高原大氣熱源與長(zhǎng)江中下游盛夏高溫的關(guān)系
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                        10.3969/2015jms.0062
                    
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基金項(xiàng)目:安徽省自然科學(xué)基金資助項(xiàng)目（1308085QD69，1408085MD74）

Relation between atmospheric heat source in spring over the Tibetan Plateau and mid-summer high temperature events in middle-lower reaches of the Yangtze River

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利用1961-2013年長(zhǎng)江中下游地區(qū)盛夏（7-8月）日極端最高氣溫和NCEP/NCAR再分析逐日資料，分析了春季（4-5月）青藏高原大氣熱源特征，找到了影響長(zhǎng)江中下游盛夏高溫的熱源關(guān)鍵區(qū)域，并就關(guān)鍵區(qū)大氣熱源對(duì)長(zhǎng)江中下游盛夏高溫的影響進(jìn)行了診斷。結(jié)果表明：春季青藏高原主體中南部大氣熱源與長(zhǎng)江中下游盛夏高溫關(guān)系密切，當(dāng)該區(qū)域大氣熱源偏弱（強(qiáng)），長(zhǎng)江中下游盛夏高溫日數(shù)偏多（少）的可能性大。當(dāng)春季青藏高原關(guān)鍵區(qū)大氣熱源偏弱（強(qiáng)）時(shí)，春季南海到西太平洋暖池對(duì)流偏強(qiáng)（偏弱），南海上空為氣旋性（反氣旋性）異常環(huán)流，西太平洋副熱帶高壓偏東（西），有利于南海夏季風(fēng)爆發(fā)偏早（晚），往往有利于盛夏西太平洋副熱帶高壓位置偏北（南），從而導(dǎo)致長(zhǎng)江中下游盛夏高溫日數(shù)偏多（偏少）。春季青藏高原關(guān)鍵區(qū)大氣熱源可以作為長(zhǎng)江中下游盛夏高溫的一個(gè)前期預(yù)報(bào)因子。

Abstract:

Based on the NCEP/NCAR reanalysis daily data and the daily maximum temperature data in middle-lower reaches of the Yangtze River from 1961 to 2013,the features of atmospheric heat source over the Tibetan Plateau was analyzed and the key area of heat source was found to diagnostically study its effects on mid-summer high temperature days in middle-lower reaches of the Yangtze River. Results show that a close relation exists between mid-summer high temperature days in middle-lower reaches of the Yangtze River and the intensity of the atmospheric heat source over the central and southern of Tibetan Plateau(key area). The high temperature days over Yangtze River are more(less) than normal while the heat source is weaker(stronger). When the heat source of the key area over Tibetan Plateau was weak(strong), the convective activities intensified(weakened) from the South China Sea to the western Pacific warm pool in spring, a cyclonic(anticyclonic) anomaly circulation existed in the lower troposphere over the South China Sea, the western Pacific subtropical high shifted eastward(westward), and the early (late) onset of the South China Sea summer monsoon can not be avoided, which all made the ridge of position of the western Pacific subtropical high in mid-summer lean to north(south) and made the mid-summer high temperature days in middle-lower reaches of the Yangtze River more(less) than normal. Spring atmospheric heat source over the central and southern of Tibetan Plateau can be used as a factor to predict the mid-summer high temperature days in middle-lower reaches of the Yangtze River.

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羅連升,段春鋒,畢云,唐為安,丁小俊.春季青藏高原大氣熱源與長(zhǎng)江中下游盛夏高溫的關(guān)系.氣象科學(xué),2016,36(5):614-621 LUO Liansheng, DUAN Chunfeng, BI Yun, TANG Weian, DING Xiaojun. Relation between atmospheric heat source in spring over the Tibetan Plateau and mid-summer high temperature events in middle-lower reaches of the Yangtze River. Journal of the Meteorological Sciences,2016,36(5):614-621

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收稿日期:2015-05-12
最后修改日期:2015-07-06
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在線發(fā)布日期: 2016-11-01
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