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Surface and permanent pycnocline temperatures and seawater d18O based on paired Mg/Ca-d18O, and abundances of Neogloboquadrina atlantica from ~2.8-2.4 Ma at IODP Site U1313 in the mid-latitude North Atlantic, supplement to: Bolton, CT et al. (accepted): North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation. Paleoceanography and Paleoclimatology

Surface and permanent pycnocline temperatures and seawater d18O based on paired Mg/Ca-d18O, and abundances of Neogloboquadrina atlantica from ~2.8-2.4 Ma at IODP Site U1313 in the mid-latitude North Atlantic, supplement to: Bolton, CT et al. (accepted): North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation. Paleoceanography and Paleoclimatology
Surface and permanent pycnocline temperatures and seawater d18O based on paired Mg/Ca-d18O, and abundances of Neogloboquadrina atlantica from ~2.8-2.4 Ma at IODP Site U1313 in the mid-latitude North Atlantic, supplement to: Bolton, CT et al. (accepted): North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation. Paleoceanography and Paleoclimatology
The North Atlantic Current (NAC) transports warm salty water to high northern latitudes, with important repercussions for ocean circulation and global climate. A southward displacement of the NAC and Subarctic Front, which separate subpolar and subtropical water masses, is widely suggested for the last glacial maximum (LGM) and may have acted as a positive feedback in glacial expansion at this time. However, the role of the NAC during the intensification of northern hemisphere glaciation (iNHG) ~3.5 to 2.5 Ma, is less clear. Here, we present new records from IODP Site U1313 (41°N) spanning ~2.8-2.4 Ma to trace the influence of Subarctic Front waters above this mid-latitude site. We reconstruct surface and permanent pycnocline temperatures and seawater δ18O using paired Mg/Ca-δ18O measurements on the planktic foraminifers Globigerinoides ruber and Globorotalia crassaformis, and determine abundances of the subpolar foraminifer Neogloboquadrina atlantica. We find that the first significant glacial incursions of Subarctic Front surface waters above Site U1313 did not occur until ~2.6 Ma. At no time during our study interval was (sub)surface reorganisation in the mid-latitude North Atlantic analogous to the LGM. Our findings suggest that LGM-like processes sensu stricto cannot be invoked to explain interglacial-glacial cycle amplification during iNHG. They also imply that increased glacial productivity at Site U1313 during iNHG was not only driven by southward deflections of the Subarctic Front. We suggest nutrient injection from cold-core eddies and enhanced glacial dust delivery may have played additional roles in increasing export productivity in the mid-latitude North Atlantic from 2.7 Ma.
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
PANGAEA
Bolton, Clara T
d3f550f0-1fe9-4d18-8a9c-a61034ab0280
Bailey, Ian
635ff85d-4492-45be-bdf5-b54a2762a703
Friedrich, Oliver
680f066c-a4b1-4647-beb3-281addc1ee17
Tachikawa, Kazuyo
b8dd7c88-d0a3-4144-9cd5-a625528a6699
de Garidel-Thoron, Thibault
adbcc7e0-4fc8-48e6-86f5-5dad26c54822
Vidal, Laurence
6c601b85-3e74-412e-ac17-4ec10bea652d
Sonzogni, Corinne
f4c419ec-e483-4622-8af8-e7fa02278a7f
Marino, Gianluca
40d6f3f2-0905-4c0f-8eb9-6d577b2833bb
Rohling, Eelco
a2a27ef2-fcce-4c71-907b-e692b5ecc685
Robinson, Marci M
59f40b6d-1f67-4d3a-aadd-aa75393c9237
Ermini, Magali
e36764ba-f15e-4a50-80e4-57483d91d256
Koch, Mirjam C
217a6968-5790-419b-aab7-e60dbfdc91ce
Cooper, Matthew J
4305aed4-3f8e-4df7-a3bb-ba86d8224db8
Wilson, Paul A
e63eb4be-1e7f-4732-b17d-7338dc7bff98
Bolton, Clara T
d3f550f0-1fe9-4d18-8a9c-a61034ab0280
Bailey, Ian
635ff85d-4492-45be-bdf5-b54a2762a703
Friedrich, Oliver
680f066c-a4b1-4647-beb3-281addc1ee17
Tachikawa, Kazuyo
b8dd7c88-d0a3-4144-9cd5-a625528a6699
de Garidel-Thoron, Thibault
adbcc7e0-4fc8-48e6-86f5-5dad26c54822
Vidal, Laurence
6c601b85-3e74-412e-ac17-4ec10bea652d
Sonzogni, Corinne
f4c419ec-e483-4622-8af8-e7fa02278a7f
Marino, Gianluca
40d6f3f2-0905-4c0f-8eb9-6d577b2833bb
Rohling, Eelco
a2a27ef2-fcce-4c71-907b-e692b5ecc685
Robinson, Marci M
59f40b6d-1f67-4d3a-aadd-aa75393c9237
Ermini, Magali
e36764ba-f15e-4a50-80e4-57483d91d256
Koch, Mirjam C
217a6968-5790-419b-aab7-e60dbfdc91ce
Cooper, Matthew J
4305aed4-3f8e-4df7-a3bb-ba86d8224db8
Wilson, Paul A
e63eb4be-1e7f-4732-b17d-7338dc7bff98

Bolton, Clara T, Bailey, Ian, Friedrich, Oliver, Tachikawa, Kazuyo, de Garidel-Thoron, Thibault, Vidal, Laurence, Sonzogni, Corinne, Marino, Gianluca, Rohling, Eelco, Robinson, Marci M, Ermini, Magali, Koch, Mirjam C, Cooper, Matthew J and Wilson, Paul A (2018) Surface and permanent pycnocline temperatures and seawater d18O based on paired Mg/Ca-d18O, and abundances of Neogloboquadrina atlantica from ~2.8-2.4 Ma at IODP Site U1313 in the mid-latitude North Atlantic, supplement to: Bolton, CT et al. (accepted): North Atlantic mid-latitude surface-circulation changes through the Plio-Pleistocene intensification of northern hemisphere glaciation. Paleoceanography and Paleoclimatology. PANGAEA doi:10.1594/PANGAEA.892805 [Dataset]

Record type: Dataset

Abstract

The North Atlantic Current (NAC) transports warm salty water to high northern latitudes, with important repercussions for ocean circulation and global climate. A southward displacement of the NAC and Subarctic Front, which separate subpolar and subtropical water masses, is widely suggested for the last glacial maximum (LGM) and may have acted as a positive feedback in glacial expansion at this time. However, the role of the NAC during the intensification of northern hemisphere glaciation (iNHG) ~3.5 to 2.5 Ma, is less clear. Here, we present new records from IODP Site U1313 (41°N) spanning ~2.8-2.4 Ma to trace the influence of Subarctic Front waters above this mid-latitude site. We reconstruct surface and permanent pycnocline temperatures and seawater δ18O using paired Mg/Ca-δ18O measurements on the planktic foraminifers Globigerinoides ruber and Globorotalia crassaformis, and determine abundances of the subpolar foraminifer Neogloboquadrina atlantica. We find that the first significant glacial incursions of Subarctic Front surface waters above Site U1313 did not occur until ~2.6 Ma. At no time during our study interval was (sub)surface reorganisation in the mid-latitude North Atlantic analogous to the LGM. Our findings suggest that LGM-like processes sensu stricto cannot be invoked to explain interglacial-glacial cycle amplification during iNHG. They also imply that increased glacial productivity at Site U1313 during iNHG was not only driven by southward deflections of the Subarctic Front. We suggest nutrient injection from cold-core eddies and enhanced glacial dust delivery may have played additional roles in increasing export productivity in the mid-latitude North Atlantic from 2.7 Ma.

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Published date: 2018
Keywords: Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)

Identifiers

Local EPrints ID: 432119
URI: http://eprints.soton.ac.uk/id/eprint/432119
PURE UUID: 760f57ee-e9a3-4c82-a03e-2f29d0d638d2
ORCID for Eelco Rohling: ORCID iD orcid.org/0000-0001-5349-2158

Catalogue record

Date deposited: 02 Jul 2019 16:30
Last modified: 03 Jul 2019 00:37

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Contributors

Creator: Clara T Bolton
Creator: Ian Bailey
Creator: Oliver Friedrich
Creator: Kazuyo Tachikawa
Creator: Thibault de Garidel-Thoron
Creator: Laurence Vidal
Creator: Corinne Sonzogni
Creator: Gianluca Marino
Creator: Eelco Rohling ORCID iD
Creator: Marci M Robinson
Creator: Magali Ermini
Creator: Mirjam C Koch
Creator: Matthew J Cooper
Creator: Paul A Wilson

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