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Observed temperature trends in the Indian Ocean over 1960-1999 and associated mechanisms

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Alory, G and Wijffels, SE and Meyers, G (2007) Observed temperature trends in the Indian Ocean over 1960-1999 and associated mechanisms. Geophysical Research Letters, 34 (2). LO2606. ISSN 0094-8276

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Abstract

The linear trends in oceanic temperature from 1960 to 1999 are estimated using the new Indian Ocean Thermal Archive (IOTA), a compilation of historical temperature profiles. Widespread surface warming is found, as in other data sets, and reproduced in IPCC climate model simulations for the 20th century. This warming is particularly large in the subtropics, and extends down to 800 m around 40–50°S. Models suggest the deep-reaching subtropical warming is related to a 0.5° southward shift of the subtropical gyre driven by a strengthening of the westerly winds, and associated with an upward trend in the Southern Annular Mode index. In the tropics, IOTA shows a subsurface cooling corresponding to a shoaling of the thermocline and increasing vertical stratification. Most models suggest this trend in the tropical Indian thermocline is likely associated with the observed weakening of the Pacific trade winds and transmitted to the Indian Ocean by the Indonesian throughflow.

Item Type: Article
Keywords: Indian Ocean; temperature; trend.
Journal or Publication Title: Geophysical Research Letters
Publisher: American Geophysical Union
Page Range: LO2606
ISSN: 0094-8276
Identification Number - DOI: 10.1029/2006GL028044,
Date Deposited: 07 Apr 2008 14:43
Last Modified: 18 Nov 2014 03:36
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