赤道太平洋季节海面高变化及与ENSO指数的关系  

The correlation between seasonal sea surface height and ENSO index in equatorial Pacific ocean

作　　者：李雨青 暴景阳 LI Yuqing;BAO Jingyang(School of Geodesy and Geomatics,Wuhan University,Wuhan 430070,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430070

出　　处：《海洋测绘》2023年第2期50-54,共5页Hydrographic Surveying and Charting

基　　金：国家自然科学基金(42192531)。

摘　　要：为了探寻海面高的长期趋势变化、季节变化与厄尔尼诺南方涛动(ENSO)现象的关系,对赤道太平洋区域验潮站数据,利用设计的滑动窗口,开展调和分析,得到时变的平均海面项以及Sa、Ssa长周期分潮项,利用Doodson滤波及二次拟合滤波的融合方法,得到多年的月均海面年变化过程以及年较差,利用MK突变分析法判定海面高变化突变时间点。分析结果表明:海面高变化速率的突变与ENSO存在关联关系;气象分潮Sa和Ssa与ENSO具有一定的相关性;以上关联特征在不同地理环境下存在差别。本文发现的不同时间尺度的海面高变化与ENSO指数的关系一定程度上能够辅助判断ENSO的特征规律,有助于对ENSO开展进一步的研究和预测。In order to explore the correlation between the mean sea level trend and the anomalous changes of the annual and semi-annual periodic tides,with the El Nino Southern Oscillation(ENSO),the following calculations are carried out using the data of tide gauge stations in the equatorial Pacific region:using the sliding window(monthly step)annual harmonic analysis to obtain the mean sea level term and the long-period tides terms Sa and Ssa;integrating the Doodson filter and the quadratic fitting monthly filter to obtain the multi-year monthly mean sea level change process and the annual difference;and using the Mann-Kendall abrupt change test to detect the sudden change point of mean sea level data series.The results show that there is a correlation between the sudden change in the mean sea level rise rate and the ENSO index,and the meteorological tides Sa and Ssa are related to ENSO while their response to ENSO is different in different geographical environments,which could help to determine the characteristics of different El Nino events to a certain extent,and it would be helpful for further research and prediction of ENSO.

关 键 词：平均海面变化 长周期分潮 潮汐调和分析 Doodson滤波 MK突变分析 厄尔尼诺-南方涛动 

分 类 号：P229.2[天文地球—大地测量学与测量工程]