摘要
本文基于1993年1月至2021年12月的卫星高度计数据,利用最小二乘法和集合经验模态分解对舟山及邻近东海海平面的长期变化及其影响因子进行分析。研究发现,研究区海平面整体以上升趋势为主,在舟山群岛东侧海域,上升趋势更为明显;平均线性速率为0.36±0.10 cm/a,2018年起上升趋势有所减缓。研究区海平面变化具有明显的季节差异,其线性速率为秋季最大(0.37±0.12 cm/a),冬季次之,春、夏两季略小(约为0.34±0.10 cm/a)。近30年来的非线性变化趋势显示,夏、秋季的上升速率几乎不变,冬季的上升速率呈减缓态势,春季呈加速上升态势。研究区海平面变化存在年振幅增大的趋势,长期变化与温度引起的海水热膨胀效应以及风应力引起的增-减水效应密切相关。
Based on the satellite altimeter data from January 1993 to December 2021,the least squares method and the ensemble empirical mode decomposition(EEMD)were used to analyze the long-term changes of the sea level in Zhoushan and the adjacent East China Sea and its influencing factors.The study found that the sea level in the study area was generally on an upward trend,and the upward trend was more obvious in the coastal waters on the east side of the Zhoushan Islands.The average linear rate was 0.36±0.10 cm/a,and the upward trend had been somewhat mitigated since 2018.The sea level in the study area showed obvious seasonal differences.Its linear rate was the largest in autumn(0.37±0.12 cm/a),followed by in winter,and slightly smaller in spring and summer(approximately 0.34±0.10 cm/a).The nonlinear change trend over the past 30 years showed that the upward rates in summer and autumn had almost remained unchanged,the upward rate in winter had shown a slowdown trend,and the upward trend in spring had been accelerating.There was a trend of increasing annual amplitude of the sea level in the study area.The long-term changes of the sea level were closely related to the seawater thermal expansion effect caused by temperature and the water increase-decrease effect caused by changes in wind stress.
作者
金杰
陈宇杰
姚永衡
张思远
胡镇涛
丁梦蓉
贾彬
JIN Jie;CHEN Yujie;YAO Yongheng;ZHANG Siyuan;HU Zhentao;DING Mengrong;JIA Bin(College of Marine Science and Technology,Zhejiang Ocean University,Zhoushan 316022,China)
出处
《海洋学研究》
北大核心
2025年第1期69-78,共10页
Journal of Marine Sciences
基金
浙江省大学生科技创新活动计划暨新苗人才计划(2023R411001)
浙江省自然科学基金(LQ24D060002)。
关键词
海平面变化
舟山海域
东海
集合经验模态分解算法
线性趋势
非线性趋势
sea level change
Zhoushan sea areas
East China Sea
the ensemble empirical model decomposition
linear trend
nonlinear trend
作者简介
第一作者:金杰(2003—),男,浙江省绍兴市人,主要从事海平面上升方面的研究,E-mail:19818006791@163.com;通信作者:贾彬(1994—),女,讲师,主要从事近海水动力及海平面变化方面的研究,E-mail:2022172@zjou.edu.cn。
