广州盛夏高温频数异常分析
ANALYSIS OF MID-SUMMER HIGH TEMPERATURE FREQUENCY ANOMALY IN GUANGZHOU
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摘要: 运用EOF、相关分析等方法,分析了广州市1951-2004年高温频数的基本气候特征,并探讨了盛夏(7-8月)高温频数异常与同期65-150°E,10-70°N范围内500 hPa高度场的关系。结果表明:(1)近54年来广州年平均出现高温次数为8.7日;5-9月都有高温出现,其中7、8月是高温的频发期;(2)广州市高温频数具有明显的年际和年代际变化,其中1980年代以来高温频数明显增加;(3)广州市盛夏高温频数在1980年代以来的异常增多是与同期我国西北部-蒙古-贝加尔湖及附近地区西风带活动减弱、中低纬副热带高压强度加强有密切的关系。Abstract: Using EOF, correlation analysis methods, the climatic characteristics are analyzed of the yearly Guangzhou high temperature frequency(HTF) during 1951-2004, and the relationship between the mid-summer (July and August) HTF anomaly and the 500 hPa heights of the region(65-150°E, 10-70°N) at the same time is also discussed. The results show that: (1) the average of HTF is 8.7 days per year in the recent 54 years in Guangzhou; high temperature occurs from May to September, and July and August have the largest frequency of occurrence; (2) there are distinct interannual and interdecadal changes in Guangzhou HTF, with an obvious increase since 1980s; (3) anomalous increase of mid-summer HTF in Guangzhou since the 1980's has a close relation with the weakened westerlies in Northwest China, Mongolia, Baikal and their vicinity and the intensified subtropical high in the mid-low latitude areas.
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Key words:
- high temperature frequency /
- 500 hPa height /
- correlation
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