气象科技进展2025，Vol.15Issue(2)：10-20,77,12.DOI:10.3969/j.issn.2095-1973.2025.02.002
2023年昆明准静止锋对云南的影响
The Impact of Kunming Quasi-Stationary Front on Yunnan in 2023
摘要
Abstract
Utilizing surface observation data and ERA5 reanalysis data,this study analyzed the impact of Kunming quasi-stationary front(QSF)on Yunnan in 2023.Typical cases were selected to comparatively analyze the frontal weather,frontal structure,and circulation characteristics of the westward-advancing,maintaining,and eastward-retreating Kunming quasi-stationary fronts.The results indicate that Yunnan was influenced by 27 Kunming quasi-stationary front processes in 2023,including 14 westward-advancing events lasting 106 d,5 maintaining events lasting 32 d,and 8 eastward-retreating events lasting 27 d.Westward-advancing events occurred throughout the year,maintaining events primarily occurred in spring and autumn,and eastward-retreating events mainly occurred in early winter,spring,and late autumn.Generally speaking,the westward-advancing Kunming quasi-stationary front often brings strong cooling,localized snowfall,and cold waves to central and eastern Yunnan.The maintenance of the Kunming quasi-stationary front means persistent low temperatures,overcast,and rainy weather with limited sunshine in eastern Yunnan.And the eastward-retreating type often causes abrupt changes in the weather conditions in eastern Yunnan,transitioning from overcast to cloudy or clear.The isotherms within the frontal zone of the westward-advancing type are densely packed and perpendicular to the ground.Among the 3 types,the westward-advancing type is characterized with the highest upward height,the thickest cold air and the strongest easterly wind behind the front,which is followed by the maintaining type,with the eastward-retreating type as the weakest.All 3 types exhibit clockwise secondary circulation behind the front,with the westward-advancing type being the strongest.The following conditions are favorable for the westward advancement of Kunming quasi-stationary front:The 500 hPa East Asian trough is oriented northeast-southwest,with strong cold advection behind the trough;the southern branch trough is located in the Arabian Sea with weak warm advection ahead;a shear line exists between Sichuan and Yunnan at 700 hPa;an anticyclone is located to the east of the Sichuan Basin at 800 hPa;and the surface cold high is near(110°E,40°N).The following conditions are favorable for the maintaining of Kunming quasi-stationary front:The 500 hPa East Asian trough is quasi-north-south oriented,with weak cold advection behind the trough;the southern branch trough is located in the northern Bay of Bengal with moderate warm advection ahead;the Sichuan-Yunnan shear line at 700 hPa is not prominent;the anticyclone at 800 hPa is located to the north of the Sichuan Basin;and the surface cold high is to the east of 110°E and to the north of 40°N.The eastward retreating of Kunming quasi-stationary front is likely to be triggered by the following conditions:The 500 hPa East Asian trough is to the east of 140°E,with weak cold advection behind the trough;the southern branch trough deepens,with strong warm advection ahead of the trough;there is not Sichuan-Yunnan shear line at 700 hPa;the anticyclone at 800 hPa is positioned further south;and the surface cold high is weak.关键词
2023年/昆明准静止锋/锋面天气/锋面结构/环流特征Key words
2023/Kunming quasi-stationary front/frontal weather/frontal structure/circulation characteristic分类
大气科学引用本文复制引用
朱莉,陈艳,周秀美,唐盛,段雪梅..2023年昆明准静止锋对云南的影响[J].气象科技进展,2025,15(2):10-20,77,12.基金项目
国家自然科学基金项目(42375043,42375042) （42375043,42375042）
中国气象局复盘总结专项(FPZJ2024-121) （FPZJ2024-121）
云南省重点研发计划项目(202203AC100005,202201AS070069) （202203AC100005,202201AS070069）
中国气象科学研究院基本科研业务费专项基金项目(2023Z010) （2023Z010）
中国气象局创新发展专项(CXFZ2024P019,CXFZ2025J120) （CXFZ2024P019,CXFZ2025J120）
