Productivity and dissolved oxygen controls on the Southern Ocean deep‐sea benthos during the Antarctic Cold Reversal

Stewart, Joseph A.; Li, Tao; Spooner, Peter T.; Burke, Andrea; Chen, Tianyu; Roberts, Jenny; Rae, James W.B.; Peck, Victoria ORCID: https://orcid.org/0000-0002-7948-6853; Kender, Sev; Liu, Qian; Robinson, Laura F.. 2021 Productivity and dissolved oxygen controls on the Southern Ocean deep‐sea benthos during the Antarctic Cold Reversal. Paleoceanography and Paleoclimatology, 36 (10), e2021PA004288. 17, pp. https://doi.org/10.1029/2021PA004288

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Abstract/Summary

The Antarctic Cold Reversal (ACR; 14.7 to 13 thousand years ago; ka) phase of the last deglaciation saw a pause in the rise of atmospheric CO2 and Antarctic temperature, that contrasted with warming in the North. A re-expansion of sea ice and a northward shift in the position of the westerly winds in the Southern Ocean are well-documented, but the response of deep-sea biota and the primary drivers of habitat viability remain unclear. Here we present a new perspective on ecological changes in the deglacial Southern Ocean, including multi-faunal benthic assemblage (foraminifera and cold-water corals) and coral geochemical data (Ba/Ca and δ11B) from the Drake Passage. Our records show that, during the ACR, peak abundances of thick-walled benthic foraminifera Uvigerina bifurcata and corals are observed at shallow depths in the sub-Antarctic (∼300 m), while coral populations at greater depths and further south diminished. Our ecological and geochemical data indicate that habitat shifts were dictated by (i) a northward migration of food supply (primary production) into the Subantarctic Zone and (ii) poorly oxygenated seawater at depth during this Antarctic cooling interval.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2021PA004288
ISSN:	2572-4517
Additional Keywords:	Coral, Foraminifera, Drake Passage, Deglacial
Date made live:	11 Oct 2021 10:00 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/531210

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1029/2021PA004288

ISSN:

2572-4517

Additional Keywords:

Coral, Foraminifera, Drake Passage, Deglacial

Date made live:

11 Oct 2021 10:00 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/531210