气象2026，Vol.52Issue(5)：566-579,14.DOI:10.7519/j.issn.1000-0526.2026.022801
准双周振荡对2023年6月广东连续暖区暴雨的影响
The Influence of Quasi-Biweekly Oscillations on Continuous Warm-Sector Rainstorms in Guangdong in June 2023
摘要
Abstract
The low-frequency oscillation characteristics of continuous rainstorm processes in Guangdong during the pre-flood season in 2023 are analyzed by means of wavelet analysis and Lanczos temporal filter.The focus of this study is on revealing the mean atmospheric circulation field and its evolution characteris-tics in different phases of quasi-biweekly oscillations and the source of the low-frequency signals of the continuous warm-sector rainstorms with strong southwesterly winds in the northwest of Guangdong Prov-ince.The results show that the three continuous rainstorms exhibited a quasi-7-18 d periodic oscillation,located in the positive phase of two quasi-30-60 d intraseasonal oscillations.The continuous warm-sector rainstorms with strong southwesterly winds mainly occurred in the northwest of Guangdong in 22-26 June when there were stable"west blocking"and"east blocking"at the middle and high latitudes.During this period,the northwest of Guangdong was located at the bottom of the plateau trough and the edge of the western Pacific subtropical high at 500 hPa,and at the left side of southwest monsoon axis and the right side of the cyclonic circulations at 850 hPa.During the intermittent-start-peak period of the continu-ous warm-sector rainstorm processes with strong southwesterly winds,the low-frequency signals in the mid-to-upper levels originated from the southern branch wave train with the eastward propagation and southward extension of baroclinic low-frequency anticyclones and cyclones within or to the south of the Iranian Plateau and Qinghai-Xizang Plateau.The low-frequency signals in the lower levels arose from the eastward movement and southward extension of the eastern Mongolian Plateau low-frequency anticyclone and the progressively intensifying low-frequency cyclone east of the Sichuan Basin and Yunnan-Guizhou Plateau.They induced the center of South Asian high to move eastward gradually and the western Pacific subtropical high to weaken and retreat eastward.At the same time,the Qinghai-Xizang Plateau was con-trolled by low-frequency cyclonic circulation in intermittent periods and gradually became dominated by the low-frequency anticyclone circulation in the peak period,while North China and South China were con-trolled first by low-frequency anticyclone circulation in intermittent periods and then gradually by the low-frequency cyclonic circulation in the peak period.These findings could provide some references for medium-to-extended range forecasting of continuous warm-sector rainstorm.关键词
连续暖区暴雨/准双周振荡/环流特征/低频信号Key words
continuous warm-sector rainstorm/quasi-biweekly oscillation/circulation characteristic/low-frequency signal分类
天文与地球科学引用本文复制引用
纪忠萍,谷德军,高晓容,徐艳虹,李珊珊,梁巧倩,涂静,梁伟杰..准双周振荡对2023年6月广东连续暖区暴雨的影响[J].气象,2026,52(5):566-579,14.基金项目
中国气象局水文气象重点开放实验室开放研究课题重点项目(23SWQXZ007)、国家自然科学基金项目(42365001)、粤港澳大湾区气象科技协同攻关项目(GHMA2025Y01)和广东省气象局科研项目(GRMC2023M28、GRMC2023M33、GRMC2024Q20)共同资助 （23SWQXZ007）
