On the dynamics of interdecadal thermocline depth and sea surface temperature variability in the low to mid-latitude Pacific Ocean

McGregor, Shayne and Holbrook, Neil J. and Power, Scott B. (2004) On the dynamics of interdecadal thermocline depth and sea surface temperature variability in the low to mid-latitude Pacific Ocean. Geophysical Research Letters, 31 (24). pp. 1-4. ISSN 0094-8276


Abstract

The role of upper ocean dynamics in generating interdecadal sea surface temperature (SST) variations is investigated with the help of the Australian Bureau of Meteorology Research Centre coupled general circulation model (CGCM) and a first baroclinic mode ( shallow-water ) ocean model (SWM). An empirical orthogonal function analysis is performed on the lowpass filtered SST and vertically averaged temperature in the upper 300 m anomaly data output from a 100-year CGCM simulation. The dominant mode SST spatial pattern and time variability is consistent with the Interdecadal Pacific Oscillation. The SWM is forced by wind stresses from the CGCM 100-year simulation to investigate the role of oceanic Rossby and Kelvin wave propagation on thermocline depth variations. The SWM produces variability similar to the CGCM interdecadal variability. We conclude that large scale wind forced upper ocean dynamics play a dominant role in generating interdecadal upper ocean temperature variations on decadal and longer timescales.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 05 Jan 2022 05:22
Last Modified: 05 Jan 2022 05:22
Uncontrolled Keywords: Coupled general circulation model (CGCM); Ocean dynamics; Pacific ocean; Sea surface temperature (SST)
Fields of Research (2008): 04 Earth Sciences > 0401 Atmospheric Sciences > 040105 Climatology (excl.Climate Change Processes)
Fields of Research (2020): 37 EARTH SCIENCES > 3702 Climate change science > 370202 Climatology
Socio-Economic Objectives (2008): D Environment > 96 Environment > 9603 Climate and Climate Change > 960304 Climate Variability (excl. Social Impacts)
Socio-Economic Objectives (2020): 19 ENVIRONMENTAL POLICY, CLIMATE CHANGE AND NATURAL HAZARDS > 1905 Understanding climate change > 190502 Climate variability (excl. social impacts)
Identification Number or DOI: https://doi.org/10.1029/2004GL021241
URI: http://eprints.usq.edu.au/id/eprint/44900

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