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Decadal characterization of Indo-Pacific Ocean subsurface temperature modes in SODA reanalysis


Vargas-Hernandez, JM and Wijffels, SE and Meyers, G and Belo Do Couto, A and Holbrook, NJ, Decadal characterization of Indo-Pacific Ocean subsurface temperature modes in SODA reanalysis, Journal of Climate, 28, (15) pp. 6113-6132. ISSN 0894-8755 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 American Meteorological Society

DOI: doi:10.1175/JCLI-D-14-00700.1


Studies of decadal-to-multidecadal ocean subsurface temperature variability are fundamental to improving the understanding of low-frequency climate signals. The present study uses the Simple Ocean Data Assimilation (SODA) version 2.2.4 product for the period 1950–2007 to identify decadal modes of variability that characterize the upper Indo-Pacific Ocean temperature structure (5–466-m depth). An empirical orthogonal function (EOF) analysis of the 10-yr low-pass filtered temperature field applied across four depths shows that the dominant mode is characterized by a long-term temperature trend, with warming at the surface and cooling at the thermocline depth connecting the tropical western Pacific with the southern Indian Ocean via the Indonesian Seas. EOF analysis of the detrended 10-yr filtered temperature data and correlation analyses of the EOF time series with established large-scale climate indices identified the interdecadal Pacific oscillation as EOF1, the North Pacific Gyre Oscillation as EOF2, and the decadal component of El Niño Modoki as EOF3 (respectively, modes 2, 3, and 4 of the nondetrended data). EOF2 identifies the Atlantic multidecadal oscillation when the analysis is applied to sea surface temperature anomalies only, suggesting that the surface is forced dominantly by fluxes associated with global-scale weather patterns, while the subsurface is dominantly forced by internal dynamics of the Pacific Ocean. This paper demonstrates that the decadal-to-interdecadal temperature variability in SODA has a pronounced vertical extension through the upper ocean. The upper thermocline accounts for most of the variance in the analysis. These results reinforce the importance of examining the subsurface ocean in climate dynamics studies that seek to understand the ocean’s role.

Item Details

Item Type:Refereed Article
Keywords:Indo-Pacific Ocean, Simple Ocean Data Assimilation, SODA, ocean subsurface, temperature modes
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate variability (excl. social impacts)
UTAS Author:Vargas-Hernandez, JM (Mr Jose Vargas Hernandez)
UTAS Author:Meyers, G (Professor Gary Meyers)
UTAS Author:Belo Do Couto, A (Mr Andre Belo Do Couto)
UTAS Author:Holbrook, NJ (Professor Neil Holbrook)
ID Code:103059
Year Published:2015
Web of Science® Times Cited:5
Deposited By:IMAS Research and Education Centre
Deposited On:2015-09-17
Last Modified:2017-10-31

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