Oman coral δ18O seawater record suggests that Western Indian Ocean upwelling uncouples from the Indian Ocean Dipole during the global-warming ... View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

Takaaki K. Watanabe, Tsuyoshi Watanabe, Atsuko Yamazaki, Miriam Pfeiffer, Michel R. Claereboudt

ABSTRACT

The Indian Ocean Dipole (IOD) is an interannual mode of climate variability in the Indian Ocean that has intensified with 20th century global-warming. However, instrumental data shows a global-warming hiatus between the late-1990s and 2015. It is presently not clear how the global-warming hiatus affects modes of climate variability such as the IOD, and their basin-wide ocean-atmosphere teleconnections. Here, we present a 26-year long, biweekly record of Sr/Ca and δ18O from a Porites coral drilled in the Gulf of Oman. Sea surface temperature (SSTanom) is calculated from Sr/Ca ratios, and seawater δ18O (δ18Osw-anom) is estimated by subtracting the temperature component from coral δ18O. Our δ18Osw-anom record reveals a significant regime shift in 1999, towards lower mean δ18Osw values, reflecting intensified upwelling in the western Indian Ocean. Prior to the 1999 regime shift, our SSTanom and δ18Osw-anom show a clear IOD signature, with higher values in the summer of positive-IOD years due to weakened upwelling. The IOD signature in SSTanom and δ18Osw-anom disappears with the overall intensification of upwelling after the 1999 regime shift. The inferred increase in upwelling is likely driven by an intensified Walker circulation during the global-warming hiatus. Upwelling in the Western Indian Ocean uncouples from the IOD. More... »

PAGES

1887

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-018-38429-y

DOI

http://dx.doi.org/10.1038/s41598-018-38429-y

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1112089302

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30760830


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48 schema:description The Indian Ocean Dipole (IOD) is an interannual mode of climate variability in the Indian Ocean that has intensified with 20<sup>th</sup> century global-warming. However, instrumental data shows a global-warming hiatus between the late-1990s and 2015. It is presently not clear how the global-warming hiatus affects modes of climate variability such as the IOD, and their basin-wide ocean-atmosphere teleconnections. Here, we present a 26-year long, biweekly record of Sr/Ca and δ<sup>18</sup>O from a Porites coral drilled in the Gulf of Oman. Sea surface temperature (SST<sub>anom</sub>) is calculated from Sr/Ca ratios, and seawater δ<sup>18</sup>O (δ<sup>18</sup>O<sub>sw-anom</sub>) is estimated by subtracting the temperature component from coral δ<sup>18</sup>O. Our δ<sup>18</sup>O<sub>sw-anom</sub> record reveals a significant regime shift in 1999, towards lower mean δ<sup>18</sup>O<sub>sw</sub> values, reflecting intensified upwelling in the western Indian Ocean. Prior to the 1999 regime shift, our SST<sub>anom</sub> and δ<sup>18</sup>O<sub>sw-anom</sub> show a clear IOD signature, with higher values in the summer of positive-IOD years due to weakened upwelling. The IOD signature in SST<sub>anom</sub> and δ<sup>18</sup>O<sub>sw-anom</sub> disappears with the overall intensification of upwelling after the 1999 regime shift. The inferred increase in upwelling is likely driven by an intensified Walker circulation during the global-warming hiatus. Upwelling in the Western Indian Ocean uncouples from the IOD.
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