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近30年上海地区暴雨的气候变化特征

DOI: 10.11867/j.issn.1001-8166.2009.11.1260, PP. 1260-1267

Keywords: 上海地区,暴雨,天气型,气候变化特征

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Abstract:

利用上海地区11个气象站1979—2008年5~9月降水资料分析了近30年上海地区暴雨的年、月际及暴雨成因的变化特征。结果表明1995年以来,上海地区暴雨逐渐向强、局部、特短时间方向变化。7、8月暴雨较多,以短时局部性暴雨为主;6、9月暴雨次之,6月长和特长暴雨要多于短和特短暴雨,9月反之;5月暴雨最少。从形成上海地区暴雨天气系统的分析表明,静止锋暴雨最多,稳定时能形成持续时间长的强暴雨,不稳定时形成短的弱暴雨;其次是暖区暴雨,它是上海地区形成夏季短时局部性强暴雨的主要天气型;另外,台风、台风切变、台风倒槽、低压、冷锋、暖锋和东风扰动形成的暴雨也占有一定的比例。1995年以来,暖区暴雨整体增加,而静止锋暴雨进入21世纪逐渐减少,这可能主要归因于气候变暖和城市热岛效应。

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