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湖泊科学  2002 

东亚小冰期气候形成中太阳辐射和火山灰作用的敏感性试验

DOI: 10.18307/2002.0201

Keywords: 小冰期,东亚,太阳辐射,火山灰,模拟

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Abstract:

利用最新的太阳辐射变化资料和火山灰记录通过气候模式的模拟试验来探讨小冰期气候的形成因子,并揭示其动力学机制.模拟结果较好地反映了在太阳辐射和火山灰作用下典型小冰期东亚地区的温度和降水变化.主要结论是:在小冰期典型强迫条件下,欧亚大陆年平均温度普遍降低,且具有明显的区域差异,高纬度降温幅度大于低纬度,冬季降温幅度大于夏季.我国长江流域以北的广大地区的降温幅度在0.2-0.4℃之间.不同季风区对火山灰和太阳辐射变化具有不同的响应.东南季风控制的地区(如我国的华东、华南地区)降水明显减少,年平均减少幅度在0.5-1.5mm/d之间,西风和西南季风控制的广大地区降水几乎持平或略增,最大年均增幅小于0.5mm/d.这与历史证据和自然记录资料是一致的.

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