基于多星融合高度计数据的太平洋海域海平面变化特征分析

Analysis on the Characteristics of Sea Level Change in the Pacific Ocean Based on Multi-Satellite Altimeter Data

利用1993年1月—2012年12月共20 a的多星融合高度计数据,对太平洋海域海平面变化的空间分布、长期趋势等特征进行了分析。结果表明:(1)太平洋海域海平面总体呈西升东降的形态;(2)太平洋海域平均海平面的上升速率为0.284 28 cm/a,谱分析的结果表明其变化以1 a周期信号为主,且各部分海域平均海平面上升速率的分析结果也呈现西部大于东部的特征;(3)EOF分析表明第一模态为年代际模态,且可以解释原场的大部分,第二、第三模态为年际模态。

Using the 20 years＇ multi-satellite altimeter data from Jan. 1993 to Dec. 2012, this paper analyzes the characteristics of sea level change in the Pacific Ocean, such as the spatial distribution and long-term trend. The results show the following facts：（1） the sea level of the Pacific Ocean rises in the west and drops in the east in general;（2） the rising rate of the average sea level is 0.28428 cm/a for the Pacific Ocean, and the major variation period is 1 a according to spectrum analysis, and the analysis results for each part of the sea level also show that the rising rate at the west is larger than that at the east;（3） the first EOF mode is a decadal mode which can explain most of the original field, and the second and third modes are inter-annual modes.