LI Yunxiao,HUA Wei,YANG Yidian.Influence of Spring North Atlantic Sea Surface Temperature on Summer Temperature Variability in Northeast China[J].Journal of Chengdu University of Information Technology,2025,40(03):346-351.[doi:10.16836/j.cnki.jcuit.2025.03.015]
北大西洋春季海温对中国东北地区夏季气温的影响
- Title:
- Influence of Spring North Atlantic Sea Surface Temperature on Summer Temperature Variability in Northeast China
- 文章编号:
- 2096-1618(2025)03-0346-06
- Keywords:
- climate change; North Atlantic sea surface temperature; summer temperature; temporal and spatial variation; influence mechanism
- 分类号:
- P425
- 文献标志码:
- A
- 摘要:
- 为探究北大西洋春季海温对东亚地区夏季气候的影响,基于CN05.1高分辨格点气温资料、ERA5再分析资料和NOAA重建海表温度资料,采用经验正交分解、回归分析和相关分析等统计诊断方法对1979-2016年北大西洋春季海温对中国东北地区夏季气温的影响及可能机理进行分析,结果表明:(1)北大西洋春季海温主要呈三极型模态,具体表现为由南至北呈显著的“负—正—负”分布,负中心分别位于北大西洋北部和低纬地区,正中心位于北大西洋中纬度西部。该模态存在明显的年际和年代际变化特征,其年代际变化表现出“负—正—负—正”的变化特点。(2)中国东北地区夏季气温整体上呈较一致的增暖趋势,其年代际趋势从20世纪80年代至今表现为“负—正—负”的变化特征。(3)中国内蒙古北部、黑龙江西部、以及吉林东部部分地区夏季气温与前期春季北大西洋海温呈显著负相关关系。同时,春季北大西洋海温对上述地区夏季气温极端高低年也存在明显影响。(4)北大西洋春季海温通过激发罗斯贝波的东传影响对流层中高层大气环流,并使东北上空整体受正涡度平流控制,导致该地区以上升运动为主,高层东亚大槽加深,中低层呈现气旋性环流,利于维持阴雨天气,造成东北地区夏季气温降低。
- Abstract:
- To investigate the influence of the North Atlantic Ocean in spring on the summer temperature in Northeast China and the possible mechanisms involved,an analysis was conducted based on the 1961-2020 CN05.1 high-resolution grid temperature data,ERA5 atmospheric reanalysis data,and NOAA reconstructed sea surface temperature data. Statistical diagnostic methods including empirical orthogonal decomposition, regressionanalysis,and correlation analysis were used to examine their relationship.The results indicate:(1)Spring North Atlantic sea surface temperature exhibits a tri-polar pattern,with a significant “negative-positive-negative” distribution from south to north. The negative centers are located in the northern North Atlantic and low-latitude areas, while the positive center is in the western mid-latitude North Atlantic.This pattern exhibits interannual and decadal variability,characterized by a “negative-positive-negative-positive” variation.(2)Summer temperature in Northeast China show an overall warming trend, with decadal variability characterized by a “negative-positive-negative” pattern from the 1980s to the present.(3)In northern Inner Mongolia,western Heilongjiang, and parts of westernJilin,there is a significant negative correlation between spring North Atlantic sea surface temperature and summer temperatures.Additionally,spring North Atlantic sea surface temperatures have a noticeable impact on extremely high and low summer temperatures in these regions.(4)Spring North Atlantic sea surface temperature influences the atmospheric circulation in the mid to upper troposphere by exciting Rossby waves downstream.This leads to overall positive vorticity advection in the upper troposphere over Northeast China, upward motion predominating,deepening of the East Asian upper-level trough,and cyclonic circulation in the mid to lower troposphere.This is conducive to maintaining cloudy and rainy weather,resulting in lower summer temperatures in Northeast China.
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备注/Memo
收稿日期:2023-10-31
基金项目:国家自然科学基金资助项目(42275022); 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