2013年夏季浙江省高溫干旱環(huán)流異常分析

doi:10.3969/2014jms.0086

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2013年夏季浙江省高溫干旱環(huán)流異常分析
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                        10.3969/2014jms.0086
                    
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基金項(xiàng)目:國家自然科學(xué)基金資助項(xiàng)目(41375063)

Circulation anomaly of summer high temperature and drought in Zhejiang of 2013

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利用浙江省10個站的溫度和降水資料、國家氣候中心160站的降水資料、NOAA的ERSST和OLR資料及NCEP再分析資料,對2013年7至8月發(fā)生在浙江省的持續(xù)高溫干旱天氣過程的基本特征和環(huán)流異常進(jìn)行了分析。結(jié)果表明:浙江省各站的高溫日數(shù)、高溫持續(xù)日數(shù)、持續(xù)無降水日數(shù)、干旱指數(shù)都遠(yuǎn)超歷史同期紀(jì)錄,降水較常年偏少3成以上。南亞高壓強(qiáng)度偏強(qiáng),面積偏大,東側(cè)脊點(diǎn)位置偏東;西太平洋副高強(qiáng)度偏強(qiáng),西側(cè)脊點(diǎn)位置偏西;東亞季風(fēng)異常偏強(qiáng)及其造成的水汽輻合偏弱,是高溫干旱天氣產(chǎn)生的重要原因。其中7月底西太平洋副高的異常西伸及8月異常持續(xù)偏西對浙江8月持續(xù)高溫干旱的發(fā)生起了決定性作用,這與同期熱帶西太平洋暖池區(qū)增暖、菲律賓周圍對流活動加強(qiáng)有關(guān),后者通過EAP/PJ遙相關(guān)型對前者產(chǎn)生影響。

Abstract:

Based on the temperature and precipitation data of 10 stations in Zhejiang, the precipitation data of 160 stations from National Climatic center, the ERSST and OLR data from NOAA and the NCEP reanalysis data, the general characteristics and circulation anomaly of the continuous high temperature and drought weather occurred in Zhejiang during July to August, 2013 are analyzed. Results show that high-temperature days, persistent high-temperature days, persistent no-precipitation days and drought index greatly exceed those in history. The rainfall was more than 30% below the historical average. The more intensive South Asia high and eastward position of the east ridge point, the more remarkable West Pacific Subtropical high (WPSH) and westward position of the west ridge point, the anomalous strong South Asian summer monsoon and as a result its weaker moisture convergence were all the main reasons bringing about the high-temperature and drought weather. The anomalous westward of the WPSH occurring at the end of July and its anomalous persistence in August played a decisive role in the lasting high temperature and drought in Zhejiang. Moreover, the WPSH anomaly was related to the warming of the western Tropical Pacific warm pool and intensive convection in the area around the Philippines at the same time, and the latter affected the former by EAP/PJ pattern.

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王羱,桑悅洋,張立鳳.2013年夏季浙江省高溫干旱環(huán)流異常分析.氣象科學(xué),2015,35(2):140-149 WANG Yuan, SANG Yueyang, ZHANG Lifeng. Circulation anomaly of summer high temperature and drought in Zhejiang of 2013. Journal of the Meteorological Sciences,2015,35(2):140-149

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收稿日期:2014-07-08
最后修改日期:2014-09-29
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在線發(fā)布日期: 2015-05-08
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