Planktonic foraminiferal δ¹⁸O and δ¹³C values, derived sea-surface temperatures from d18O and selected planktonic foraminiferal species for core P69 of Hawke Bay off eastern North Island
Recent evidence suggests that the Subtropical Convergence (STC) zone east of New Zealand shifted little from its modern position along Chatham Rise during the last glaciation, and that offshore surface waters north of the STC zone cooled only slightly. However, at nearshore core site P69 (2195 m dep...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.729180 2023-05-15T13:42:09+02:00 Planktonic foraminiferal δ¹⁸O and δ¹³C values, derived sea-surface temperatures from d18O and selected planktonic foraminiferal species for core P69 of Hawke Bay off eastern North Island Nelson, Campbell S Hendy, Ingrid L Neil, Helen L Hendy, Chris H Weaver, Philip PE LATITUDE: -40.396670 * LONGITUDE: -177.996670 2000-08-16 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.729180 https://doi.org/10.1594/PANGAEA.729180 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.729180 https://doi.org/10.1594/PANGAEA.729180 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Nelson, Campbell S; Hendy, Ingrid L; Neil, Helen L; Hendy, Chris H; Weaver, Philip PE (2000): Last glacial jetting of cold waters through the Subtropical Convergence zone in the Southwest Pacific off eastern New Zealand, and some geological implications. Palaeogeography, Palaeoclimatology, Palaeoecology, 156, 103-121, https://doi.org/10.1016/S0031-0182(99)00134-0 GC Gravity corer Hikurangi margin P69 Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.729180 https://doi.org/10.1016/S0031-0182(99)00134-0 2023-01-20T07:31:34Z Recent evidence suggests that the Subtropical Convergence (STC) zone east of New Zealand shifted little from its modern position along Chatham Rise during the last glaciation, and that offshore surface waters north of the STC zone cooled only slightly. However, at nearshore core site P69 (2195 m depth), 115 km off the east coast of North Island and ca 300 km north of the modern STC zone, planktonic foraminiferal species, transfer function data and stable oxygen and carbon isotope records suggest that surface waters were colder by up to 6°C during the late last glacial period compared to the Holocene, and included a strong upwelling signature. Presently site P69 is bathed by south-flowing subtropical waters in the East Cape Current. The nearshore western end of Chatham Rise supports a major bathymetric depression, the Mernoo Saddle, through which some exchange between northern subtropical and southern subantarctic water presently occurs. It is proposed that as a result of much intensified current flows south of the Rise during the last glaciation, a consequence of more compressed subantarctic water masses, lowered sea level, and an expanded and stronger Westerly Wind system, there was accelerated leakage northwards of both Australasian Subantarctic Water and upwelled Antarctic Intermediate Water over Mernoo Saddle in a modified and intensified Southland Current. The expanded cold water masses displaced the south-flowing warm East Cape Current off southeastern North Island, and offshore divergence was accompanied by wind-assisted upwelling of nutrient-rich waters in the vicinity of P69. A comparable kind of inshore cold water jetting possibly characterised most glacial periods since the latest Miocene, and may account for the occasional occurrence of subantarctic marine fossils in onland late Cenozoic deposits north of the STC zone, rather than invoking wholesale major oscillations of the oceanic STC itself. Dataset Antarc* Antarctic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic East Cape ENVELOPE(-45.183,-45.183,-60.633,-60.633) Hawke Bay ENVELOPE(-55.998,-55.998,53.017,53.017) New Zealand ENVELOPE(-177.996670,-177.996670,-40.396670,-40.396670) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
GC Gravity corer Hikurangi margin P69 |
spellingShingle |
GC Gravity corer Hikurangi margin P69 Nelson, Campbell S Hendy, Ingrid L Neil, Helen L Hendy, Chris H Weaver, Philip PE Planktonic foraminiferal δ¹⁸O and δ¹³C values, derived sea-surface temperatures from d18O and selected planktonic foraminiferal species for core P69 of Hawke Bay off eastern North Island |
topic_facet |
GC Gravity corer Hikurangi margin P69 |
description |
Recent evidence suggests that the Subtropical Convergence (STC) zone east of New Zealand shifted little from its modern position along Chatham Rise during the last glaciation, and that offshore surface waters north of the STC zone cooled only slightly. However, at nearshore core site P69 (2195 m depth), 115 km off the east coast of North Island and ca 300 km north of the modern STC zone, planktonic foraminiferal species, transfer function data and stable oxygen and carbon isotope records suggest that surface waters were colder by up to 6°C during the late last glacial period compared to the Holocene, and included a strong upwelling signature. Presently site P69 is bathed by south-flowing subtropical waters in the East Cape Current. The nearshore western end of Chatham Rise supports a major bathymetric depression, the Mernoo Saddle, through which some exchange between northern subtropical and southern subantarctic water presently occurs. It is proposed that as a result of much intensified current flows south of the Rise during the last glaciation, a consequence of more compressed subantarctic water masses, lowered sea level, and an expanded and stronger Westerly Wind system, there was accelerated leakage northwards of both Australasian Subantarctic Water and upwelled Antarctic Intermediate Water over Mernoo Saddle in a modified and intensified Southland Current. The expanded cold water masses displaced the south-flowing warm East Cape Current off southeastern North Island, and offshore divergence was accompanied by wind-assisted upwelling of nutrient-rich waters in the vicinity of P69. A comparable kind of inshore cold water jetting possibly characterised most glacial periods since the latest Miocene, and may account for the occasional occurrence of subantarctic marine fossils in onland late Cenozoic deposits north of the STC zone, rather than invoking wholesale major oscillations of the oceanic STC itself. |
format |
Dataset |
author |
Nelson, Campbell S Hendy, Ingrid L Neil, Helen L Hendy, Chris H Weaver, Philip PE |
author_facet |
Nelson, Campbell S Hendy, Ingrid L Neil, Helen L Hendy, Chris H Weaver, Philip PE |
author_sort |
Nelson, Campbell S |
title |
Planktonic foraminiferal δ¹⁸O and δ¹³C values, derived sea-surface temperatures from d18O and selected planktonic foraminiferal species for core P69 of Hawke Bay off eastern North Island |
title_short |
Planktonic foraminiferal δ¹⁸O and δ¹³C values, derived sea-surface temperatures from d18O and selected planktonic foraminiferal species for core P69 of Hawke Bay off eastern North Island |
title_full |
Planktonic foraminiferal δ¹⁸O and δ¹³C values, derived sea-surface temperatures from d18O and selected planktonic foraminiferal species for core P69 of Hawke Bay off eastern North Island |
title_fullStr |
Planktonic foraminiferal δ¹⁸O and δ¹³C values, derived sea-surface temperatures from d18O and selected planktonic foraminiferal species for core P69 of Hawke Bay off eastern North Island |
title_full_unstemmed |
Planktonic foraminiferal δ¹⁸O and δ¹³C values, derived sea-surface temperatures from d18O and selected planktonic foraminiferal species for core P69 of Hawke Bay off eastern North Island |
title_sort |
planktonic foraminiferal δ¹⁸o and δ¹³c values, derived sea-surface temperatures from d18o and selected planktonic foraminiferal species for core p69 of hawke bay off eastern north island |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.729180 https://doi.org/10.1594/PANGAEA.729180 |
op_coverage |
LATITUDE: -40.396670 * LONGITUDE: -177.996670 |
long_lat |
ENVELOPE(-45.183,-45.183,-60.633,-60.633) ENVELOPE(-55.998,-55.998,53.017,53.017) ENVELOPE(-177.996670,-177.996670,-40.396670,-40.396670) |
geographic |
Antarctic East Cape Hawke Bay New Zealand |
geographic_facet |
Antarctic East Cape Hawke Bay New Zealand |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Supplement to: Nelson, Campbell S; Hendy, Ingrid L; Neil, Helen L; Hendy, Chris H; Weaver, Philip PE (2000): Last glacial jetting of cold waters through the Subtropical Convergence zone in the Southwest Pacific off eastern New Zealand, and some geological implications. Palaeogeography, Palaeoclimatology, Palaeoecology, 156, 103-121, https://doi.org/10.1016/S0031-0182(99)00134-0 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.729180 https://doi.org/10.1594/PANGAEA.729180 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.729180 https://doi.org/10.1016/S0031-0182(99)00134-0 |
_version_ |
1766163625661169664 |