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西部干旱区未来气候变化高分辨率预估

, PP. 429-437

Keywords: 西部干旱区,气候变化,高分辨率,未来预估

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Abstract:

利用高分辨率区域气候模式WRF,基于CMIP5计划中MIROC5输出结果,进行了我国高分辨率(30km)的历史模拟及未来预估。针对我国西部干旱区,在模式验证的基础上分析了该区域未来气温和降水的变化。历史模拟结果显示WRF对我国西部干旱区有较好的模拟能力,模拟结果较MIROC5有明显改进。21世纪西部干旱区将持续增暖,末期的增温幅度明显高于中期。和全国平均相比,西部干旱区21世纪增温幅度高于全国平均水平。空间分布上,年平均气温变化的主要特征是新疆南部增温高于新疆北部,山区的增温高于盆地。气温季节变化主要表现为夏季增温集中在山区,而冬季增温则更多集中在盆地。西部干旱区降水在21世纪总体呈现减少趋势,夏季降水减少更为明显,这和全国平均的降水增加并不一致。空间分布上,降水变化的主要特征是山区降水减少,其中夏季山区降水减少十分明显,而盆地降水则略有增加。

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