FAN Zixuan,HUA Wei.The Impact of North Atlantic Oscillation on Winter Temperature in Northeastern China[J].Journal of Chengdu University of Information Technology,2024,39(06):733-738.[doi:10.16836/j.cnki.jcuit.2024.06.013]
北大西洋涛动对中国东北地区冬季气温的影响
- Title:
- The Impact of North Atlantic Oscillation on Winter Temperature in Northeastern China
- 文章编号:
- 2096-1618(2024)06-0733-06
- Keywords:
- North Atlantic Oscillation; Northeastern China; winter temperature; climate change; temporal and spatial variation
- 分类号:
- P425
- 文献标志码:
- A
- 摘要:
- 为分析近几十年来北大西洋涛动(North Atlantic oscillation,NAO)对中国东北地区冬季气候的影响,利用1969-2019年CN05.1高分辨率格点气温资料、NCEP/NCAR再分析资料及NAO指数,采用经验正交分解、相关分析和合成分析等方法对中国东北地区冬季气温受冬季NAO的影响进行分析。结果显示:(1)NAO与中国东北地区冬季气温之间存在密切联系,即当冬季NAO为正异常时,中国东北地区冬季气温偏高,反之亦然。(2)东亚冬季大气环流受冬季NAO传播至东亚地区的波动所影响,波活动通量强辐散区主要位于北大西洋地区,其水平波作用量存在向东的传播路径,向南传播至北非地区后向北传播亚洲西部地区,而后向东亚地区传播并向南传播至太平洋地区。(3)冬季北大西洋涛动异常会通过影响对流层环流因子从而影响中国东北地区冬季气温,具体表现为当北大西洋涛动正异常时,导致东亚北部上空位势高度正异常,东亚冬季风减弱,且此时对流层中低层存在反气旋环流,以下沉运动为主,导致中国东北地区气温偏暖,而当北大西洋涛动负异常时情况则相反。
- Abstract:
- To analyze the effects of the North Atlantic Oscillation(NAO)on winter climate in northeastern China in recent decades, CN05.1 high-resolution grid point temperature data, NCEP/NCAR reanalysis data, and NAO index from 1969 to 2019 are used. The influence of NAO on winter temperature in northeastern China was analyzed by Empirical Orthogonal Function, correlation analysis and composite analysis. The results show that:(1)There is a close relationship between winter temperature and NAO in northeastern China, that is, when the winter NAO is positive, the winter temperature in northeastern China is higher, and vice versa.(2)The winter NAO can propagate to East Asia through fluctuations, thus affecting the East Asian winter atmospheric circulation. The North Atlantic region is a strong dispersion region for wave activity fluxes, and there is an eastward propagation path for the horizontal wave action in this strong dispersion region, which propagates southward to the North African region and then northward to the western Asian region, and then to the East Asian region and southward to the Pacific region.(3)The NAO anomaly in winter will affect the winter temperature in northeastern China by affecting the tropospheric circulation factors. Specifically, when the North Atlantic oscillation is a positive anomaly, the influence leads to a geopotential height positive anomaly over northern East Asia, and the East Asian winter monsoon weakens. At this time, there is an anticyclone circulation in the middle and lower troposphere, which is dominated by subsidence, resulting in warmer temperatures in the northeast of China, while the opposite is true when the North Atlantic Oscillation is a negative anomaly.
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备注/Memo
收稿日期:2023-06-18
基金项目:国家自然科学基金资助项目(42075019); 第二次青藏高原综合科学考察研究资助项目(2019QZKK010203)
通信作者:华维.E-mail:huawei@cuit.edu.cn