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科学通报  2012 

低频海平面变化及其与太平洋气候事件的相关性

, PP. 1588-1595

Keywords: 卫星测高,验潮站,海平面变化,南方涛动,太平洋年代际振荡

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Abstract:

全球海平面变化不仅表现为明显的长期性趋势和季节性变化特征,而且还可能具有年际和年代际变化特征.本文联合卫星测高和验潮站观测数据各自具备的优势,重构了1948~2007年间全球平均海平面变化时间序列.基于该序列,计算得到20世纪后半期海平面上升加速度约为0.010±0.009mm/a2,并分析发现海平面变化存在包括年代际在内的多尺度低频振荡,而1993~2003年期间的海平面变化正处在低频振荡的加快上升期.然后利用移去长期性趋势后重构的海平面变化时间序列,分析发现海平面变化低频信号与南方涛动和太平洋年代际振荡指数之间表现了较强的相关性,但在部分时间段内存在一定差异,其原因可能是频发的厄尔尼诺和拉尼娜现象及太平洋年代际振荡短期反相事件共同作用的结果.

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