【摘要】 利用1961—2022年我国北方753个国家级气象观测站逐日最高气温和最低气温资料、ERA5逐月再分析资料，对环渤海地区夏季暖日、暖夜和复合极端高温事件的时空分布特征及其对应同期和前期大气环流特征进行分析对比。结果表明，环渤海地区夏季暖日呈减少趋势，而暖夜和复合极端高温事件呈增加趋势，且复合极端高温增加更加明显，并且都存在明显的年代际变化特征。暖日、暖夜、复合极端高温分别主要发生在6月上中旬、6月下旬至8月中旬、7月中下旬，且复合极端高温事件发生强度明显增强。通过三个极端高温指数回归同期环流场发现，复合极端高温在欧亚大陆存在明显的波列结构，类似于暖日回归结果，但不同的是欧洲西部和贝加尔湖地区的正距平中心强度更强，且西西伯利亚地区的负距平中心强度更弱。通过回归前期环流场发现，三个极端高温指数在中高纬度地区都存在明显的波列结构。在对流层中高层，贝加尔湖地区附近出现高度场正异常中心，并伴随异常的反气旋性环流，存在异常下沉运动，导致环渤海极端高温事件发生。更多还原

【Abstract】 Based on daily maximum and minimum temperature data of 753 national stations in northern China from 1961 to 2022 and the ERA5 monthly reanalysis data, this paper comparatively analyzes the spatial and temporal distribution characteristics of the summer warm day, warm night and compound extreme high temperature events in the Bohai Rim region and their corresponding atmospheric circulations in the same period and the previous period. The results show that, in the Bohai Rim region in summer, warm day shows a decreasing trend, while the warm night and compound extreme high temperature events show an increasing trend. Moreover, the increase in compound extreme high temperature becomes more significant. Both of the warm night and compound extreme high temperature have obvious inter-decadal variation characteristics. Warm day, warm night and compound extreme high temperature appear mainly in the early to middle of June, late June to mid-August, and mid-to-late July, respectively. In particular, the intensities of compound extreme high temperature events have increased significantly.Through the corresponding circulation field of the three extreme high temperature index regression, it is found that the compound extreme high temperature has an obvious wave-train structure in Eurasia, similar to the result of warm day regression. But what is different is that the positive anomaly center in western Europe and the Baikal Lake region is much stronger, and the negative anomaly center in West Siberia is much weaker. The regression of the previous circulation fields suggests that the three extreme high temperature indices all have obvious wave-train structures in the mid-high latitudes. In the middle and upper troposphere, a positive anomaly center of height field appears near the Baikal Lake area, accompanied by an abnormal anticyclonic circulation and the abnormal sinking motion. This is responsible for the occurrence of extreme high temperature events around the Bohai Rim region.更多还原