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Cocos (Keeling) Corals Reveal 200 Years of Multidecadal Modulation of Southeast Indian Ocean Hydrology by Indonesian Throughflow

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posted on 2019-08-20, 14:54 authored by R Hennekam, J Zinke, E van Sebille, M ten Have, G-JA Brummer, G-J Reichart
The only low latitude pathway of heat and salt from the Pacific Ocean to the Indian Ocean, known as Indonesian Throughflow (ITF), has been suggested to modulate Global Mean Surface Temperature (GMST) warming through redistribution of surface Pacific Ocean heat. ITF observations are only available since ~1990s, and thus, its multidecadal variability on longer time scales has remained elusive. Here we present a 200 year bimonthly record of geochemical parameters (δ18O-Sr/Ca) measured on Cocos (Keeling) corals tracking sea surface temperature (SST; Sr/Ca) and sea surface salinity (SSS; seawaterδ18O═δ18Osw) in the southeastern tropical Indian Ocean (SETIO). Our results show that SETIO SSS and δ18Osw were impacted by ITF transport over the past 60 years, and therefore, reconstructions of Cocos δ18Osw hold information on past ITF variability on longer time spans. Over the past 200 years ITF leakage into SETIO is dominated by the interannual climate modes of the Pacific Ocean (El Niño—Southern Oscillation) and Indian Ocean (Indian Ocean Dipole). Pacific decadal climate variability (represented by the Pacific Decadal Oscillation) significantly impacted ITF strength over the past 200 years determining the spatiotemporal SST and SSS advection into the Indian Ocean on multidecadal time scales. A comparison of our SETIO δ18Osw record to GMST shows that ITF transport varied in synchrony with global warming rate, being predominantly high/low during GMST warming slowdown/acceleration, respectively. This hints toward an important role for the ITF in global warming rate modulation.

Funding

NWO. Grant Numbers: ALWOP.2015.113, 834.11.003 Australian Research Council Dutch Ministry of Education, Culture and Science (OCW) Australian Research Council. Grant Number: DE130101336

History

Citation

Paleoceanography and Paleoclimatology, 2018, 33 (1), pp. 48-60

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/School of Geography, Geology and the Environment

Version

  • VoR (Version of Record)

Published in

Paleoceanography and Paleoclimatology

Publisher

American Geophysical Union

issn

2572-4517

Acceptance date

2017-12-13

Copyright date

2018

Available date

2019-08-20

Notes

Supplementary material available on the publisher website at https://doi.org/10.1002/2017PA003181

Language

en

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