A radiolarian-based palaeoclimate history of Core Y9 (Northeast of Campbell Plateau, New Zealand) for the last 160 kyr
Sea-surface temperatures (SSTs) based on radiolarian assemblage changes are estimated for the last 160 kyr, from a sediment core (Y9) recovered from Pukaki Saddle, northeast of Campbell Plateau. Site Y9 lies beneath Subantarctic Surface Water (SAW) immediately to the north of the Subantarctic Front...
Published in: | Marine Micropaleontology |
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2015
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Online Access: | https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/39021 https://doi.org/10.1016/j.marmicro.2014.12.003 |
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:39021 2023-05-15T13:50:38+02:00 A radiolarian-based palaeoclimate history of Core Y9 (Northeast of Campbell Plateau, New Zealand) for the last 160 kyr Panitz, Sina Cortese, Giuseppe Neil, Helen L. Diekmann, Bernhard 2015 https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/39021 https://doi.org/10.1016/j.marmicro.2014.12.003 eng eng https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/39021 https://doi.org/10.1016/j.marmicro.2014.12.003 info:eu-repo/semantics/closedAccess Institut für Geowissenschaften article doc-type:article 2015 ftubpotsdam https://doi.org/10.1016/j.marmicro.2014.12.003 2022-07-28T20:46:54Z Sea-surface temperatures (SSTs) based on radiolarian assemblage changes are estimated for the last 160 kyr, from a sediment core (Y9) recovered from Pukaki Saddle, northeast of Campbell Plateau. Site Y9 lies beneath Subantarctic Surface Water (SAW) immediately to the north of the Subantarctic Front (SAF), which in this region is bathymetrically constrained by the edges of Campbell Plateau and defines the northern boundary of the Antarctic Circumpolar Current (ACC). Radiolarian assemblages are characterised by an exceptionally high abundance of the Antarctic to subantarctic species Antarctissa spp. (up to 68%), especially during glacial intervals. SST estimates are derived using Factor Analysis and the Modern Analog Technique. Both methods capture the glacial-interglacial (G-I) pattern. The SST reconstructions show the changing relative influence of distinct water masses during the past G-I cycle, with major temperature variations of the order of 7-9 degrees C at glacial Terminations. Glacials (marine isotope stages (MIS) 6 and 2) are associated with particularly cool SSTs that are indicative of a more vigorous SAF/ACC and an enhancement of the inflow through Pukaki Saddle and/or frequent development of cold-core eddies at the SAF. By contrast, the influence of warmer waters and relaxation of the ACC during interglacials can be inferred from temperatures slightly warmer (e.g., mid-Holocene) and/or comparable to present day (e.g., MIS 5e). During these intervals, relatively warmer temperatures most likely indicate a higher warmcore eddy activity due to a strengthened Subtropical Front and/or a weakened inflow of cool water through Pukaki Saddle and/or an increased stratification in the Campbell Plateau region. Furthermore, the SST record is characterised by an abrupt warming at ca. 10 kyr (i.e., Termination l), the occurrence of a reversal at Termination I, and a warming event at the end of MIS 4, coinciding with the A4 event in the Byrd ice core. These characteristics, together with the pronounced G-I cycle shown ... Article in Journal/Newspaper Antarc* Antarctic ice core University of Potsdam: publish.UP Antarctic Byrd Campbell Plateau ENVELOPE(171.000,171.000,-50.667,-50.667) New Zealand Pukaki ENVELOPE(162.100,162.100,-82.817,-82.817) Pukaki Saddle ENVELOPE(176.333,176.333,-48.500,-48.500) The Antarctic Marine Micropaleontology 116 1 14 |
institution |
Open Polar |
collection |
University of Potsdam: publish.UP |
op_collection_id |
ftubpotsdam |
language |
English |
topic |
Institut für Geowissenschaften |
spellingShingle |
Institut für Geowissenschaften Panitz, Sina Cortese, Giuseppe Neil, Helen L. Diekmann, Bernhard A radiolarian-based palaeoclimate history of Core Y9 (Northeast of Campbell Plateau, New Zealand) for the last 160 kyr |
topic_facet |
Institut für Geowissenschaften |
description |
Sea-surface temperatures (SSTs) based on radiolarian assemblage changes are estimated for the last 160 kyr, from a sediment core (Y9) recovered from Pukaki Saddle, northeast of Campbell Plateau. Site Y9 lies beneath Subantarctic Surface Water (SAW) immediately to the north of the Subantarctic Front (SAF), which in this region is bathymetrically constrained by the edges of Campbell Plateau and defines the northern boundary of the Antarctic Circumpolar Current (ACC). Radiolarian assemblages are characterised by an exceptionally high abundance of the Antarctic to subantarctic species Antarctissa spp. (up to 68%), especially during glacial intervals. SST estimates are derived using Factor Analysis and the Modern Analog Technique. Both methods capture the glacial-interglacial (G-I) pattern. The SST reconstructions show the changing relative influence of distinct water masses during the past G-I cycle, with major temperature variations of the order of 7-9 degrees C at glacial Terminations. Glacials (marine isotope stages (MIS) 6 and 2) are associated with particularly cool SSTs that are indicative of a more vigorous SAF/ACC and an enhancement of the inflow through Pukaki Saddle and/or frequent development of cold-core eddies at the SAF. By contrast, the influence of warmer waters and relaxation of the ACC during interglacials can be inferred from temperatures slightly warmer (e.g., mid-Holocene) and/or comparable to present day (e.g., MIS 5e). During these intervals, relatively warmer temperatures most likely indicate a higher warmcore eddy activity due to a strengthened Subtropical Front and/or a weakened inflow of cool water through Pukaki Saddle and/or an increased stratification in the Campbell Plateau region. Furthermore, the SST record is characterised by an abrupt warming at ca. 10 kyr (i.e., Termination l), the occurrence of a reversal at Termination I, and a warming event at the end of MIS 4, coinciding with the A4 event in the Byrd ice core. These characteristics, together with the pronounced G-I cycle shown ... |
format |
Article in Journal/Newspaper |
author |
Panitz, Sina Cortese, Giuseppe Neil, Helen L. Diekmann, Bernhard |
author_facet |
Panitz, Sina Cortese, Giuseppe Neil, Helen L. Diekmann, Bernhard |
author_sort |
Panitz, Sina |
title |
A radiolarian-based palaeoclimate history of Core Y9 (Northeast of Campbell Plateau, New Zealand) for the last 160 kyr |
title_short |
A radiolarian-based palaeoclimate history of Core Y9 (Northeast of Campbell Plateau, New Zealand) for the last 160 kyr |
title_full |
A radiolarian-based palaeoclimate history of Core Y9 (Northeast of Campbell Plateau, New Zealand) for the last 160 kyr |
title_fullStr |
A radiolarian-based palaeoclimate history of Core Y9 (Northeast of Campbell Plateau, New Zealand) for the last 160 kyr |
title_full_unstemmed |
A radiolarian-based palaeoclimate history of Core Y9 (Northeast of Campbell Plateau, New Zealand) for the last 160 kyr |
title_sort |
radiolarian-based palaeoclimate history of core y9 (northeast of campbell plateau, new zealand) for the last 160 kyr |
publishDate |
2015 |
url |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/39021 https://doi.org/10.1016/j.marmicro.2014.12.003 |
long_lat |
ENVELOPE(171.000,171.000,-50.667,-50.667) ENVELOPE(162.100,162.100,-82.817,-82.817) ENVELOPE(176.333,176.333,-48.500,-48.500) |
geographic |
Antarctic Byrd Campbell Plateau New Zealand Pukaki Pukaki Saddle The Antarctic |
geographic_facet |
Antarctic Byrd Campbell Plateau New Zealand Pukaki Pukaki Saddle The Antarctic |
genre |
Antarc* Antarctic ice core |
genre_facet |
Antarc* Antarctic ice core |
op_relation |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/39021 https://doi.org/10.1016/j.marmicro.2014.12.003 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.marmicro.2014.12.003 |
container_title |
Marine Micropaleontology |
container_volume |
116 |
container_start_page |
1 |
op_container_end_page |
14 |
_version_ |
1766253786347601920 |