地理研究

地理研究 ›› 2010, Vol. 29 ›› Issue (12): 2201-2211.doi: 10.11821/yj2010120009

• 地表过程研究 • 上一篇    下一篇

西北太平洋海区年际至十年际海面变化尺度耦合与波动转型

袁林旺, 罗文, 徐良将, 俞肇元, 易琳, 谢志仁   

  1. 南京师范大学虚拟地理环境教育部重点实验室,南京 210046
  • 收稿日期:2010-04-12 修回日期:2010-06-17 出版日期:2010-12-20 发布日期:2010-12-20
  • 作者简介:袁林旺(1973-),男,江苏海安人,博士,教授。主要从事海面变化与地理建模研究。 E-mail: yuanlinwang@njnu.edu.cn
  • 基金资助:

    国家自然科学基金重点项目(40730527);资源与环境信息系统国家重点实验室基金项目资助

Scale coupling and fluctuation transformation of interannual to interdecadal sea-level variations in Northwest Pacific Region

YUAN Lin-wang, LUO Wen, XU Liang-jiang, YU Zhao-yuan, YI Lin, XIE Zhi-ren   

  1. Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, China
  • Received:2010-04-12 Revised:2010-06-17 Online:2010-12-20 Published:2010-12-20

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被引次数

11

摘要：

利用多通道奇异谱分析(MSSA)等多尺度分析方法,对西北太平洋海区14个站位验潮序列的年际到十年际尺度海面波动的时空特征进行探讨。结果表明:2.5a周期和4.5a周期在振幅与相位上表现出与ENSO指数波动的尺度耦合,并存在显著的由低纬向高纬的振幅、能量递减的纬向传递特征。4.5a周期和8a周期与PDO变化同样表现出一定的尺度耦合波动,高纬各站位海面波动也表现出一定的自东向西的径向传递。在空间维上,PDO作用下的传播型波动的响应范围明显小于ENSO事件,反映了二者驱动机制的差异。该海区约在1973年和1998年左右发生过两次明显的海面波动转型,并与太平洋年代际涛动(PDO)存在一定关联。

关键词: MSSA, ENSO, 尺度耦合, 海面转型, PDO

Abstract:

Inter-annual to inter-decadal sea level variations and its coupling characteristics with corresponding climate fluctuations have received wide attention in such fields as climate and oceanography research. It is one of the most important parts in analyzing multi-scale spatio-temporal transmissions and dynamical mechanisms of the complex coupled ocean-atmosphere interactions. Multichannel Singular Spectrum Analysis (MSSA) is a proper multiscale spectrum method which can extract and reconstruct the spatio-temporal characteristics of the significant periodic and low frequency quasi-periodic variations from high noisy data. It is applied to the Northwest Pacific region (10°N-38°S) using 1968-2007 sea level data from 14 tide gauge stations released by Permanent Service for Mean Sea Level (PSMSL) and University of Hawaii Sea Level Center (UHSLC). These data are filtered by Empirical Mode Decomposition (EMD) to remove the long-term trend. Then inter-annual to inter-decade variability of sea level fluctuation is examined by MSSA. It is showed that, there is a scale coupling of inter-annual to inter-decade periods in amplitude and phase. The coupling characteristics change with El Nin o-Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO) variability. The significant zonal propagation with the decrease of amplitude and energy from low to high latitude can be revealed as well. The response ranges of PDO in spatial dimension are significantly narrower than that of ENSO. ENSO can affect the sea level of Dalian station (38°56'N) but PDO can only affect those of Uragrami (33°33'N) and Lusi stations (32°08'N). Singular Spectrum Analysis (SSA) is used to extract the principle scale components from Multivariate ENSO Index (MEI) and PDO index. Analyses based on the principle scale components and sea level variations also show that 2.5a periods and 4.5a periods exactly matched with ENSO variability. Meanwhile, 4.5a periods and 8a periods are significantly correlated with PDO variability. And these responses are greatly influenced by global warming. There are two distinct fluctuation transformations around 1973 and 1998. The correlation coefficient of 2.5-8a periods and PDO reach -0.40, indicating that there is some relationship between PDO and the transformations.

Key words: MSSA, ENSO, scale coupling, sea surface fluctuation transformation, PDO