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未来土地利用变化影响中国区域气候的数值模拟

, PP. 1034-1042

Keywords: 土地利用变化,区域气候,数值模拟

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Abstract:

?土地利用/土地覆盖变化(LUCC)是人类影响气候的重要强迫之一.相对于历史时期LUCC对区域气候的影响研究,未来LUCC到底对气候有多大影响不得而知.基于CMIP5推荐的土地覆盖数据,采用区域气候模式RegCM4,通过当代和反映未来(2050年)土地覆盖状况分布情况下各15年(2036~2050)的数值积分试验,探讨了未来LUCC对中国区域气候的影响.未来中国地区主要是以草地转换成森林为主要特征,LUCC引起温度和降水的变化幅度和范围具有季节性差异,其中夏、秋季区域响应最显著,主要包括中国东北、华北和河套地区,青藏高原东部以及华南等地.进一步分析表明,LUCC对大气环流也具有明显的影响,在未来LUCC影响下,印度半岛经孟加拉湾到南海及华南沿岸一带受到一致的异常西南风控制,热带印度西南季风和南海西南季风均偏强,来自南海和印度洋的异常水汽辐合使得中国南方降水偏多.

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