期刊文献+

华南前汛期持续性暴雨年代际变化特征及成因 预览 被引量:8

Decadal Variation Characteristics of South China Pre-flood Season Persistent Rainstorm and Its Mechanism
在线阅读 下载PDF
收藏 分享 导出
摘要 应用福建、广东、广西243个气象站1961—2012年逐日降水资料,构建华南前汛期暴雨强度指数,揭示了前汛期持续性暴雨年代际变化特征及其可能机理。研究表明:前汛期持续性暴雨经历了多发(1961—1972年)—少发(1973—1991年)—多发(1992—2012年)3个阶段,目前仍处于多发期,具有持续时间较长且强度增强的特点;由于前汛期降水的低频振荡受热带低频信号北传的调制,因此,导致这种显著年代际变化的可能成因是热带低频信号北传的周期和强度的年代际差异,当热带低频信号北传至华南时低频周期长(短)且强度强(弱),则前汛期易出现持续时间长(短)且强度强(弱)的持续性暴雨。 Based on the daily precipitation data of 243 stations in Fujian,Guangdong,Guangxi during 1961 —2012,indices(intensity of daily rainstorm I_(RD),intensity of persistent rainstorm I_(RS),intensity of South China pre-flood season persistent rainstorm I_(RZ)) are calculated and persistent rainstorm processes are selected.Indices reveal decadal variation characteristics of pre-flood season persistent rainstorm by kinds of mutation test and percentile method.It indicates that the decadal variation of pre-flood season persistent rainstorm can be divided into three sections,multiple(1961-1972)— fewer(1973-1991) —multiple(1992-2012).The present stage is in multiple sections with stronger intensity and longer duration;pre-flood season precipitation exhibits a significant low-frequency oscillation characteristic.The decadal variation of duration and intensity of persistent rainstorm during pre-flood season are closely related to that of configuration and intensity of low-frequency periodic signal.There is a positive correlation between the intensity of pre-flood season persistent rainstorm and the low-frequency intensity of 10 — 60 days with the intensity strongest in10 — 20 days,the second in 30 — 60 days' and the third in 20 — 30 days'.The low-frequency signal of Guangdong and Fujian is more obvious than Guangxi in all sections.Frequent,strong and long persistent rainstorm is more likely to occur in multiple sections as the precipitation intensity of low-frequency signal oscillating acutely,and vice versa.The decadal meridional propagation features of tropical intraseasonal oscillation and mechanism and its possible impact on the decadal variation of pre-flood season persistent rainstorm are also studied by using East Asia-western North Pacific ISG indexCEAWNP ISO).The position of the meridional propagation of the East Asia-Pacific Northwest Pacific with different phases can be seen according to different phases' reconstruction of 850 hPa wind speed and OLR anomaly field.T
作者 陈思 高建芸 黄丽娜 游立军 Chen Si1 Gao Jianyun1 Huang Lina2 You Lijun1 (Fujian Provincial Climate Center, Fuzhou 350001) 2 (Putian Meteorological Office of Fujian , Putian 351100)
出处 《应用气象学报》 CSCD 北大核心 2017年第1期86-97,共12页 Quarterly Journal of Applied Meteorology
基金 福建省科技厅科技计划重点项目(2011Y0008) 公益性行业(气象)科研专项(GYHY201306032) 国家自然科学基金项目(41575052) 中国气象局气候变化专项(CCSF201619) 福建省气象局青年科技专项项目(2016Q07,2015Q18,2013Q05)
关键词 前汛期 持续性暴雨 年代际变化 pre-flood season persistent rainstorm decadal variation
  • 相关文献

参考文献25

二级参考文献499

共引文献1690

同被引文献144

引证文献8

二级引证文献16

投稿分析
职称考试

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈