2011年江蘇出梅日界定之我見(jiàn)

doi:10.3969/2012jms.0071

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2011年江蘇出梅日界定之我見(jiàn)
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                        10.3969/2012jms.0071
                    
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基金項(xiàng)目:江蘇省青年氣象科研基金(Q201116)

Study on Meiyu period over Jiangsu in 2011

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利用實(shí)況觀(guān)測(cè)數(shù)據(jù)和NCEP/NCAR再分析資料,對(duì)2011年江蘇出梅日的界定進(jìn)行探討,并將7月4—20日的低溫高濕多雨、寡照的異常氣候判定為"倒黃梅",在此基礎(chǔ)上,對(duì)比分析了2011年和2009年的兩次"倒黃梅"天氣過(guò)程。結(jié)果表明:(1)2011年江蘇出梅日為6月30日;(2)出梅后的7月4—20日是"倒黃梅"天氣過(guò)程;(3)北上臺(tái)風(fēng)對(duì)梅雨和"倒黃梅"結(jié)束具有重要的指示意義;(4)"倒黃梅"和梅雨(含"二度梅")的天氣特點(diǎn)為:前者冷暖空氣頻繁交替、雨帶多經(jīng)向分布、中低空溫濕場(chǎng)反位相配置,常為低溫高濕的局地對(duì)流性降水;而后者冷暖空氣穩(wěn)定對(duì)峙、雨帶多緯向分布、中低空溫濕場(chǎng)同位相配置,常為高溫高濕的大范圍穩(wěn)定性降水。

Abstract:

By using the station-observed data and NCEP/NCAR daily reanalyzed data, the end date of Meiyu period in 2011 in Jiangsu is preliminarily studied. The abnormal climate process from July 4 to July 20 in 2011 is regarded as the ‘reoccurrence of Meiyu' period and has been analyzed in comparison with 2009, which are both caused by the southward movement of the rain band when the Meiyu period is considered to be over. Results show that: (1) June 30, 2011 is considered as the end date of Meiyu period. (2)The period from July 4 to July 20 in 2011 is the ‘reoccurrence of-Meiyu' period which is due to the southward movement of the rain band. (3) The northward typhoon has an important significance for judging the end date of the Meiyu period or ‘reoccurrence of Meiyu' period. (4) There are some differences in atmospheric circulation between the ‘reoccurrence of Meiyu' period and Meiyu period. The former has a rain band by obvious meridional distribution and is usually local convective precipitation with low temperature and high humidity which is the anti-phase of temperature and humidity fields at the low and middle level because of frequent occurrence of cold air, while the latter has a rain band by obvious zonal distribution and is usually steady precipitation on a large scale with high temperature and high humidity which is the same phase of temperature and humidity fields at the low and middle level.

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李建國(guó),孔啟亮,姚素香,趙棟,王燕.2011年江蘇出梅日界定之我見(jiàn).氣象科學(xué),2012,32(5):559-564 LI Jianguo, KONG Qiliang, YAO Suxiang, ZHAO Dong, WANG Yan. Study on Meiyu period over Jiangsu in 2011. Journal of the Meteorological Sciences,2012,32(5):559-564

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收稿日期:2011-08-23
最后修改日期:2012-04-24
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在線(xiàn)發(fā)布日期: 2012-10-24
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