为了充分认识山西省春季大风异常的时空分布特征并揭示其成因,为农业防灾减灾、改善生态环境提供决策依据,利用65个地面气象站1986—2009年逐日风观测资料和海气相关资料,应用经验正交函数分解、合成分析、序列相关分析和奇异值分解等方法,对山西省春季大风日数异常变化及其与海气异常的相关关系进行了分析。结果表明:(1)山西省春季大风日数年际异常主要存在2种不同的空间分布特征,以全区基本一致型为主,且这种分布型式呈现出年际变化特征;此外,还存在偏多、偏少并存的分布特征,且这种分布型式呈现出年代际变化特征。(2)山西省春季大风日数年际异常与中高纬环流形势异常存在显著关系。山西春季大风日数偏多年份,200 hPa、500 hPa和850 hPa高度场中高纬环流形势的异常主要表现为东亚大槽的加深、乌拉尔山脊的加强。山西省春季大风日数与同期春季亚洲西风环流指数、前期冬季北半球极涡强度指数以及前期东亚冬季风指数之间相关性较大。(3)太平洋海温异常主要影响山西春季大风日数的年代际异常,且这种影响具有持续性,而前期冬季太平洋海温场异常对山西省春季大风日数异常的影响比同期春季或前期秋季海温场异常对它的影响更为显著。当赤道太平洋呈PDO暖位相时,山西春季大风日数异常场呈现自东北向西南负正相间的空间分布。
Abstract
In order to understand fully the temporal and spatial distribution characteristics of the spring gale anomalies in Shanxi Province and reveal its causes, to provide decision-making basis for agricultural disaster prevention and mitigation and improving the ecological environment, the daily wind observations of 65 meteorological stations, the air-sea-related informations in 1986-2009 and the methods, such as empirical orthogonal function decomposition, synthetic analysis, correlation analysis and singular value decomposition were used to analyze the anomalies of the spring gale days in Shanxi Province and the relationships between it and the atmospheric circulation, the Pacific SSTA anomalies. The results showed that: (1) the interannual anomalies of the spring gale days in Shanxi Province mainly existed 2 kinds of different spatial distribution characteristics, the same type was main, in addition, existed the distribution characteristics that too many and less coexist. (2) The interannual anomalies of the gale days in the spring in Shanxi Province and the circulation anomaly over the middle and high latitude existed significant relationship. The circulation anomaly in multi-gale years mainly showed that: through in the east Asian was deepened and the ridge over Ural was strengthened. The anomaly of 500 hPa height mainly effected the interannual anomalies of gale days. There were larger correlation between the gale days in spring and the westerly circulation index in Asian, the polar vortex intensity index in northern hemisphere and the winter monsoon index in east Asian. (3) There was a certain relationship between the gale days in the spring in Shanxi Province and the Pacific SST anomaly, the Pacific SSTA anomaly mainly affected the interdecadal anomaly of the gale days, and this effect was persistent, it could continue to affect from early summer to the spring over the same period.
关键词
山西春季大风异常; 大气环流异常; 太平洋海温异常
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Key words
Shanxi spring gale interannual anomalies; the circulation anomalies; the Pacific SSTA anomalies
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脚注
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