Distinct Mechanisms of Decadal Subsurface Heat Content Variations in the Eastern and Western Indian Ocean Modulated by Tropical Pacific SST

Jin, X.; Kwon, Y.; Ummenhofer, C. C.; Seo, H.; Kosaka, Y.; Wright, J. S.

doi:10.1175/jcli-d-18-0184.1

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Distinct Mechanisms of Decadal Subsurface Heat Content Variations in the Eastern and Western Indian Ocean Modulated by Tropical Pacific SST

2018
By Jin, X. ; Kwon, Y. ; Ummenhofer, C. C. ; ...
Source: Journal of Climate, 31(19), 7751-7769

[PDF-4.35 MB]

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Journal Title:

Journal of Climate
Personal Author:

Jin, X. ; Kwon, Y. ; Ummenhofer, C. C. ; Seo, H. ; Kosaka, Y. ; ... More +

Jin, X. ; Kwon, Y. ; Ummenhofer, C. C. ; Seo, H. ; Kosaka, Y. ; Wright, J. S. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

Decadal variability of the subsurface ocean heat content (OHC) in the Indian Ocean is investigated using a coupled climate model experiment, in which observed eastern tropical Pacific sea surface temperature (EPSST) anomalies are specified. This study intends to understand the contributions of external forcing relative to those of internal variability associated with EPSST, as well as the mechanisms by which the Pacific impacts Indian Ocean OHC. Internally generated variations associated with EPSST dominate decadal variations in the subsurface Indian Ocean. Consistent with ocean reanalyses, the coupled model reproduces a pronounced east–west dipole structure in the southern tropical Indian Ocean and discontinuities in westward-propagating signals in the central Indian Ocean around 100°E. This implies distinct mechanisms by which the Pacific impacts the eastern and western Indian Ocean on decadal time scales. Decadal variations of OHC in the eastern Indian Ocean are attributed to 1) western Pacific surface wind anomalies, which trigger oceanic Rossby waves propagating westward through the Indonesian Seas and influence Indonesian Throughflow transport, and 2) zonal wind anomalies over the central tropical Indian Ocean, which trigger eastward-propagating Kelvin waves. Decadal variations of OHC in the western Indian Ocean are linked to conditions in the Pacific via changes in the atmospheric Walker cell, which trigger anomalous wind stress curl and Ekman pumping in the central tropical Indian Ocean. Westward-propagating oceanic Rossby waves extend the influence of this anomalous Ekman pumping to the western Indian Ocean.
Keywords:

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Ocean-atmosphere interactions
Source:

Journal of Climate, 31(19), 7751-7769
DOI:

https://doi.org/10.1175/jcli-d-18-0184.1
Document Type:

Journal Article
Funding:

Grant no. NA15OAR4310176 ; Grant no. NA17OAR4310255

Grant no. NA15OAR4310176 ; Grant no. NA17OAR4310255 Less -
Place as Subject:

Pacific Ocean ; Indian Ocean

Pacific Ocean ; Indian Ocean Less -
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CHORUS
Main Document Checksum:

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urn:sha256:972ec8210a7e1170aad4adedfadfeacd48563b8d96e951041e16f34bca2cd89e
Download URL:

https://repository.library.noaa.gov/view/noaa/48395/noaa_48395_DS1.pdf
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Distinct Mechanisms of Decadal Subsurface Heat Content Variations in the Eastern and Western Indian Ocean Modulated by Tropical Pacific SST

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