Productivity and Dissolved Oxygen Controls on the Southern Ocean Deep-Sea Benthos During the Antarctic Cold Reversal

Joseph A. Stewart; Tao Li; Peter T. Spooner; Andrea Burke; Tianyu Chen; Jenny Roberts; James W. B. Rae; Victoria Peck; Sev Kender; Qian Liu; Laura F. Robinson

doi:10.1029/2021PA004288

Productivity and Dissolved Oxygen Controls on the Southern Ocean Deep-Sea Benthos During the Antarctic Cold Reversal

Joseph A. Stewart^*, Tao Li, Peter T. Spooner, Andrea Burke, Tianyu Chen, Jenny Roberts, James W. B. Rae, Victoria Peck, Sev Kender, Qian Liu, Laura F. Robinson

^*Corresponding author for this work

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Abstract

Abstract 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 reexpansion 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 multifaunal 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 (a) a northward migration of food supply (primary production) into the sub-Antarctic Zone and (b) poorly oxygenated seawater at depth during this Antarctic cooling interval.

Original language	English
Article number	e2021PA004288
Number of pages	17
Journal	Paleoceanography and Paleoclimatology
Volume	36
Issue number	10
Early online date	8 Oct 2021
DOIs	https://doi.org/10.1029/2021PA004288
Publication status	Published - 19 Oct 2021

Bibliographical note

Funding Information:
We acknowledge the crew and researchers on board the research cruises who obtained the samples for this study. We thank C. Coath, C. Taylor, S. Mitchell, M. Prokopenko, M. Auro, A. Samperiz, M. Ferreira, C. Cole, and E. Littley for their help with laboratory work. We thank the editors and anonymous reviewers for their comments that improved this manuscript. Funding was provided by an Antarctic Bursary awarded to J.A.S., ERC and NERC grants awarded to L.F.R. (278705, NE/S001743/1, NE/R005117/1) and L.F.R. and J.W.B.R. (NE/N003861/1).

Publisher Copyright:
© 2021. The Authors.

Keywords

coral
foraminifera
Drake Passage
deglacial

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Stewart, J. A., Li, T., Spooner, P. T., Burke, A., Chen, T., Roberts, J., Rae, J. W. B., Peck, V., Kender, S., Liu, Q., & Robinson, L. F. (2021). Productivity and Dissolved Oxygen Controls on the Southern Ocean Deep-Sea Benthos During the Antarctic Cold Reversal. Paleoceanography and Paleoclimatology, 36(10), Article e2021PA004288. https://doi.org/10.1029/2021PA004288

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title = "Productivity and Dissolved Oxygen Controls on the Southern Ocean Deep-Sea Benthos During the Antarctic Cold Reversal",

abstract = "Abstract 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 reexpansion 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 multifaunal 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 (a) a northward migration of food supply (primary production) into the sub-Antarctic Zone and (b) poorly oxygenated seawater at depth during this Antarctic cooling interval.",

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author = "Stewart, {Joseph A.} and Tao Li and Spooner, {Peter T.} and Andrea Burke and Tianyu Chen and Jenny Roberts and Rae, {James W. B.} and Victoria Peck and Sev Kender and Qian Liu and Robinson, {Laura F.}",

note = "Funding Information: We acknowledge the crew and researchers on board the research cruises who obtained the samples for this study. We thank C. Coath, C. Taylor, S. Mitchell, M. Prokopenko, M. Auro, A. Samperiz, M. Ferreira, C. Cole, and E. Littley for their help with laboratory work. We thank the editors and anonymous reviewers for their comments that improved this manuscript. Funding was provided by an Antarctic Bursary awarded to J.A.S., ERC and NERC grants awarded to L.F.R. (278705, NE/S001743/1, NE/R005117/1) and L.F.R. and J.W.B.R. (NE/N003861/1). Publisher Copyright: {\textcopyright} 2021. The Authors.",

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T1 - Productivity and Dissolved Oxygen Controls on the Southern Ocean Deep-Sea Benthos During the Antarctic Cold Reversal

AU - Stewart, Joseph A.

AU - Li, Tao

AU - Spooner, Peter T.

AU - Burke, Andrea

AU - Chen, Tianyu

AU - Roberts, Jenny

AU - Rae, James W. B.

AU - Peck, Victoria

AU - Kender, Sev

AU - Liu, Qian

AU - Robinson, Laura F.

N1 - Funding Information: We acknowledge the crew and researchers on board the research cruises who obtained the samples for this study. We thank C. Coath, C. Taylor, S. Mitchell, M. Prokopenko, M. Auro, A. Samperiz, M. Ferreira, C. Cole, and E. Littley for their help with laboratory work. We thank the editors and anonymous reviewers for their comments that improved this manuscript. Funding was provided by an Antarctic Bursary awarded to J.A.S., ERC and NERC grants awarded to L.F.R. (278705, NE/S001743/1, NE/R005117/1) and L.F.R. and J.W.B.R. (NE/N003861/1). Publisher Copyright: © 2021. The Authors.

PY - 2021/10/19

Y1 - 2021/10/19

N2 - Abstract 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 reexpansion 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 multifaunal 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 (a) a northward migration of food supply (primary production) into the sub-Antarctic Zone and (b) poorly oxygenated seawater at depth during this Antarctic cooling interval.

AB - Abstract 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 reexpansion 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 multifaunal 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 (a) a northward migration of food supply (primary production) into the sub-Antarctic Zone and (b) poorly oxygenated seawater at depth during this Antarctic cooling interval.

KW - coral

KW - foraminifera

KW - Drake Passage

KW - deglacial

U2 - 10.1029/2021PA004288

DO - 10.1029/2021PA004288

M3 - Article (Academic Journal)

SN - 2572-4517

VL - 36

JO - Paleoceanography and Paleoclimatology

JF - Paleoceanography and Paleoclimatology

IS - 10

M1 - e2021PA004288

ER -

Productivity and Dissolved Oxygen Controls on the Southern Ocean Deep-Sea Benthos During the Antarctic Cold Reversal

Abstract

Bibliographical note

Keywords

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