气象2016，Vol.42Issue(11)：1379-1386,8.DOI:10.7519/j.issn.1000-0526.2016.11.010
副高脊线的月内振荡对汉江上游秋汛的影响
Impact of Ridge Line of the Western Pacific Subtropical High on the Upper Reaches of Hanjiang River in Autumn Flood Season
摘要
Abstract
Based on the daily precipitation data of stations in China and NCEP/NCAR reanalysis data and using Mann-Kendall method and period analysis,this paper analyzes the decadal variability and intra-monthly oscillation of the ridge line position of the western Pacific subtropical high (WPSH )in autumn, and the possible connection with autumn precipitation over the upper reaches of Hanjiang River.The re-sults show abrupt change of the WPSH ridge line in autumn happened around 1997,which is very different from the WPSH strength.After the abrupt change,the WPSH ridge line in autumn obviously moved north and the days when it stayed by north were more than before.Meanwhile,stronger intra-monthly os-cillation of the WPSH ridge line and increasing autumn precipitation over the upper reaches of Hanjiang River were observed.When quasi-biweekly period is strong,it is more likely to be rainy in autumn over the upper reaches of Hanjiang River.Conversely when quasi-biweekly period is weak,it is more likely to be dry.关键词
秋汛/副高/脊线/准双周振荡Key words
autumn flood/western Pacific subtropical high (WPSH)/ridge line/quasi-biweekly oscillation分类
天文与地球科学引用本文复制引用
吴瑶,杜良敏..副高脊线的月内振荡对汉江上游秋汛的影响[J].气象,2016,42(11):1379-1386,8.基金项目
公益性行业（气象）科研专项（GYHY201306024、GYHY201306033和 GYHY201306021）、湖北省气象局重点科技项目（2015Y07）及湖北省气象局青年基金（2016Q06）共同资助 （）
