基于验潮数据的南极海平面相对变化分析

Analysis of Antarctic sea-level relative change based on tide gauge data

基于夏威夷海平面研究中心提供的南极6个验潮站多年逐时潮位数据,本文首先利用迭代调和分析对初步观测数据进行补缺,并在此基础上计算月平均海平面,最后利用功率谱分析、最大熵谱分析、奇异谱分析等方法确定海平面的相对变化速率和振动周期。研究表明,南极海平面相对上升速率与全球其他区域基本一致(3mm/a-7mm/a),但是在个别测站(例如:Esperanza)的上升速度非常明显,达到厘米级。

Provided by University of Hawaii Sea Level Center, hourly tidal level data of six tide gauge stations in Antarctica was used to analyze sea level change in this paper. By mining the features of the preliminary observations, such as number of observations and the ratio of missing values to series length, missing values were fulfilled by iterative and weighted harmonic analysis. Subsequently, the monthly average sea level was calculated with fulfilled series by various means for further use. Finally, power spectral analysis, maximum entropy spectral analysis, singular spectrum analysis and other methods were applied to compute the relative sea level change rate and vibration cycles. Studies showed that the relative sea level change rate of most tide gauge stations in Antarctic is consistent with other regions of the world, at about 3mm/a to 7mm/a. However, resuhs showed that the sea level of some tide gauge stations, such as Esperanza, rise significantly, over 10mm/a.