| 北半球季节性冻融区与北半球夏季降水关系的研究 |
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| 引用本文： | 蒋靖海,王澄海.北半球季节性冻融区与北半球夏季降水关系的研究[J].冰川冻土,2020,42(1):53-61. |
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| 作者姓名： | 蒋靖海 王澄海 |
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| 作者单位： | 兰州大学 地球系统模式发展研究中心/大气科学学院，甘肃 兰州 730000 |
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| 基金项目： | 国家自然科学基金项目(91837205) |
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| 摘 要： | 针对冻融过程引起的土壤湿度异常与北半球夏季降水的关系， 基于1981 - 2010年ERA5的月降水和土壤湿度资料， 采用奇异值分解（SVD）方法， 分析了北半球季节性冻融区春季土壤湿度和北半球夏季降水的年际变化特征以及它们之间的相关关系。结果表明： 北半球季节性冻融区春季土壤湿度年际变化的大值区与北半球夏季降水年际变化的显著区之间存在较好的对应关系； 季节性冻融区春季土壤湿度与夏季降水之间存在着指数函数变化关系， 在北美西部、 西亚以及东亚的大部分地区， 春季土壤湿度与夏季降水呈显著的正相关， 表明季节性冻融区春季土壤湿度的增加会引起该地区夏季降水的增加。
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| 关 键 词： | 季节性冻融区 土壤湿度 降水 SVD |
| 收稿时间： | 2019-12-06 |
| 修稿时间： | 2020-03-18 |
Study on the relationship between seasonal freezing-thawing areas and summer precipitation in the Northern Hemisphere |
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| Jinghai JIANG,Chenghai WANG.Study on the relationship between seasonal freezing-thawing areas and summer precipitation in the Northern Hemisphere[J].Journal of Glaciology and Geocryology,2020,42(1):53-61. |
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| Authors: | Jinghai JIANG Chenghai WANG |
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| Institution: | Research and Development Center of Earth System Model / College of Atmospheric Sciences，Lanzhou University，Lanzhou 730000，China |
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| Abstract: | This study focuses on the relationship between soil moisture anomalies caused by the freezing and thawing process and summer precipitation in the Northern Hemisphere. The spatiotemporal characteristics of spring soil moisture in seasonal freezing-thawing areas and summer precipitation in the Northern Hemisphere and their relationship are analyzed using the singular value decomposition （SVD） with ERA5 monthly reanalysis data. It is found that there is a good correspondence between the area of large annual variation of soil moisture in spring and that of precipitation in summer in seasonal freezing-thawing area over the Northern Hemisphere. There is an exponential function relationship between spring soil moisture and summer precipitation in seasonal freezing-thawing areas. In northwest of America， West Asia， and most part of East Asia， spring soil moisture and summer precipitation are significantly positively correlated. It indicates that the increase of soil moisture in freezing-thawing areas corresponds well with the increase of the summer precipitation. |
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| Keywords: | seasonal freezing-thawing areas soil moisture precipitation singular value decomposition （SVD） |
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