On the low-frequency variability in the Indian Ocean

被引：0

作者：

Sakova, I. V. ^{[1
]}

Meyers, G. ^{[1
]}

Coleman, R. ^{[2
]}

机构：

[1] CSIRO Marine & Atmsopher Res, GPO Box 1538, Hobart, Tas 7001, Australia

[2] Univ Tasmania, Sch Geog & Environm Studies, Hobart, Tas, Australia

来源：

DYNAMIC PLANET: MONITORING AND UNDERSTANDING A DYNAMIC PLANET WITH GEODETIC AND OCEANOGRAPHIC TOOLS | 2007年 / 130卷

关键词：

Indian Ocean; Indian Ocean Dipole; Satellite Altimetry; spectral analysis;

D O I：

暂无

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

This paper presents the results of an investigation of low-frequency variability in the Indian Ocean (10) primarily using satellite altimeter sea surface height (SSH) observations and expendable bathy-thermograph (XBT) data. We found that in most regions of the 10 the low-frequency part of the SSH spectra (corresponding to signals with periods of a few months or longer) is concentrated in four frequency bands separated by substantial spectral gaps. These bands correspond to periods of approximately 6 months, 12 months, 18-20 months and more than 30 months (hereafter referred to as the 30-month band). For both 18-20-month and 30-month bands the spectral density shows a dipolelike pattern with some degree of similarity; however, analysis of the spatial -temporal evolution of these signals suggests that the 18-20-month signal is an internal mode of the 10, while that of the 30month component propagates from the Pacific Ocean, in particular with a much stronger signal during the period from 1998 to 2003.

引用

页码：47 / +

页数：2