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ISSN 1006-9895

CN 11-1768/O4

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夏季长白山天池站降水量年际变化特征及其对应的环流异常
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作者单位:

1.中国科学院大气物理研究所;2.吉林省气象科学研究所

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基金项目:

国家自然科学基金


Interannual variation of summer rainfall at the Tianchi station in Changbai Mountains and its associated circulation anomalies
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Institute of Atmospheric Physics, Chinese Academy of Sciences

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    摘要:

    长白山地处吉林省东南部,作为国家级重点生态功能区,其降水变化特征对该地森林生态系统和水资源结构变化有重要影响。本文基于1979–2016年吉林省47个台站逐月降水资料,探究了长白山天池站夏季降水的气候特征及其相关的环流异常,并与吉林省降水进行对比。分析结果表明天池夏季降水量以及年际变率高出吉林省其它站点一倍左右。此外,天池降水年际变化对应的环流异常与吉林省降水一致,即6月东北亚气旋式异常和东亚高空急流的增强,以及7、8月西太副高增强和东亚高空西风急流偏北,均可引起吉林省和天池降水偏多。另一方面,天池降水变异还表现出其独特的环流异常,与吉林省降水对应的环流异常显著不同或者甚至近乎相反,究其原因为长白山地形所致。本文的结果说明山地的气候和大气环流的关系复杂、多变。

    Abstract:

    Changbai Mountains are located in the southeast of Jilin Province. Rainfall has a crucial impact on the forest ecosystem and water resource in Changbai Mountains, which is a national key ecological function area. Based on the monthly precipitation data from 47 stations in Jilin Province and ERA-Interim monthly reanalysis data from 1979 to 2016, we investigated the climate characteristics of the summer precipitation at Tianchi station in Changbai Mountains and circulation anomalies associated with the interannual variation of rainfall at this station, and compared with the other stations in Jilin Province. The results show that the summer precipitation at Tianchi and its interannual variability are approximately two times larger than other stations in Jilin Province. On the one hand, the circulation anomalies associated with interannual variability of precipitation at Tianchi are consistent with those for Jilin Province. The circulation anomalies that favor more rainfall at Tianchi and Jilin Province are characterized by a cyclonic anomaly over Northeast Asia and enhanced East Asian jet in June, and enhanced western Pacific subtropical high and northward displaced East Asian jet in July and August. On the other hand, the precipitation in Tianchi is associated with unique circulation anomalies, which are quite different or almost opposite to those related to the precipitation in Jilin Province rainfall, and may be attributed to by the terrain of Changbai Mountains. The present results suggest that the climate variability in mountains may be related to complicated and various patterns of large-scale atmospheric circulation anomalies.

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历史
  • 收稿日期:2020-02-22
  • 最后修改日期:2020-06-12
  • 录用日期:2020-08-28
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