Reconstructing the South Pacific upper water conditions during the Late Quaternary
PP11B-1780: The Antarctic Circumpolar Current system (ACCs) is the most important current system in the Southern Ocean, characterized by strong zonal variations in specific surface water properties, variations used to classify regions whose edges are defined by fronts. The past changes in the streng...
Main Authors: | , , |
---|---|
Format: | Conference Object |
Language: | English |
Published: |
2011
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/13472/ https://oceanrep.geomar.de/id/eprint/13472/1/2011_N%C3%BCrnberg_FB1_POZ_rtapia_AGU-2011.pdf |
id |
ftoceanrep:oai:oceanrep.geomar.de:13472 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:13472 2023-05-15T14:00:49+02:00 Reconstructing the South Pacific upper water conditions during the Late Quaternary Tapia, Raúl Iván Nürnberg, Dirk Frank, Martin 2011 text https://oceanrep.geomar.de/id/eprint/13472/ https://oceanrep.geomar.de/id/eprint/13472/1/2011_N%C3%BCrnberg_FB1_POZ_rtapia_AGU-2011.pdf en eng https://oceanrep.geomar.de/id/eprint/13472/1/2011_N%C3%BCrnberg_FB1_POZ_rtapia_AGU-2011.pdf Tapia, R. I., Nürnberg, D. and Frank, M. (2011) Reconstructing the South Pacific upper water conditions during the Late Quaternary. [Poster] In: AGU Fall Meeting 2011. , 05.12.-09.12.2011, San Francisco, California, USA . Conference or Workshop Item NonPeerReviewed 2011 ftoceanrep 2023-04-07T15:02:35Z PP11B-1780: The Antarctic Circumpolar Current system (ACCs) is the most important current system in the Southern Ocean, characterized by strong zonal variations in specific surface water properties, variations used to classify regions whose edges are defined by fronts. The past changes in the strength and latitudinal position of the ACC frontal system are supposed to play a major role on the global oceanic circulation and thus the Earth’s climate through their impact on atmospheric CO2 contents by changes in water stratification conditions, Therefore the study of variability in the surface characteristics of the ACCs provides crucial information to understand and to reconstruct the global climate evolution. The dynamics of the upper-ocean vertical structure, primarily defined by vertical changes in salinity and temperature from the mixed layer down to the seasonal and permanent thermocline, can be tracked using the differences in stable oxygen isotopes (__18O) and Mg/Ca-based temperatures (_T) recorded in the test of planktic foraminifera. Only Mg/Ca thermometry coupled with _18O can guarantee a common source of signal, averaging the same environmental conditions (season and spatial habitat), where, the combined measurements of Mg/Ca and _18O allow to extract the _18O record of past upper ocean water, and accordingly salinity variations In this study we present paired measurements of Mg/Ca and stable oxygen isotopes of shallow-living and deeper-living planktic foraminifera preserved in core top and downcore samples from the South Pacific (36° to 45° S) retrieved during the SOPATRA cruise (South Pacific Paleoceanographic Transect) Chile-New Zealand. The total Mg/Ca values preserved in the foraminiferal calcite from 31 core top samples ranged from ~2 to 1.3 mmol/mol, allowing estimate SSTs between 16° and 12° C. Additionally, to evaluate the reliability of the Mg/Ca signal paleothermometry for long term reconstruction we determined the effect of calcite saturation state (_CO32-) into on foraminiferal Mg/Ca ... Conference Object Antarc* Antarctic Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic New Zealand Pacific Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
PP11B-1780: The Antarctic Circumpolar Current system (ACCs) is the most important current system in the Southern Ocean, characterized by strong zonal variations in specific surface water properties, variations used to classify regions whose edges are defined by fronts. The past changes in the strength and latitudinal position of the ACC frontal system are supposed to play a major role on the global oceanic circulation and thus the Earth’s climate through their impact on atmospheric CO2 contents by changes in water stratification conditions, Therefore the study of variability in the surface characteristics of the ACCs provides crucial information to understand and to reconstruct the global climate evolution. The dynamics of the upper-ocean vertical structure, primarily defined by vertical changes in salinity and temperature from the mixed layer down to the seasonal and permanent thermocline, can be tracked using the differences in stable oxygen isotopes (__18O) and Mg/Ca-based temperatures (_T) recorded in the test of planktic foraminifera. Only Mg/Ca thermometry coupled with _18O can guarantee a common source of signal, averaging the same environmental conditions (season and spatial habitat), where, the combined measurements of Mg/Ca and _18O allow to extract the _18O record of past upper ocean water, and accordingly salinity variations In this study we present paired measurements of Mg/Ca and stable oxygen isotopes of shallow-living and deeper-living planktic foraminifera preserved in core top and downcore samples from the South Pacific (36° to 45° S) retrieved during the SOPATRA cruise (South Pacific Paleoceanographic Transect) Chile-New Zealand. The total Mg/Ca values preserved in the foraminiferal calcite from 31 core top samples ranged from ~2 to 1.3 mmol/mol, allowing estimate SSTs between 16° and 12° C. Additionally, to evaluate the reliability of the Mg/Ca signal paleothermometry for long term reconstruction we determined the effect of calcite saturation state (_CO32-) into on foraminiferal Mg/Ca ... |
format |
Conference Object |
author |
Tapia, Raúl Iván Nürnberg, Dirk Frank, Martin |
spellingShingle |
Tapia, Raúl Iván Nürnberg, Dirk Frank, Martin Reconstructing the South Pacific upper water conditions during the Late Quaternary |
author_facet |
Tapia, Raúl Iván Nürnberg, Dirk Frank, Martin |
author_sort |
Tapia, Raúl Iván |
title |
Reconstructing the South Pacific upper water conditions during the Late Quaternary |
title_short |
Reconstructing the South Pacific upper water conditions during the Late Quaternary |
title_full |
Reconstructing the South Pacific upper water conditions during the Late Quaternary |
title_fullStr |
Reconstructing the South Pacific upper water conditions during the Late Quaternary |
title_full_unstemmed |
Reconstructing the South Pacific upper water conditions during the Late Quaternary |
title_sort |
reconstructing the south pacific upper water conditions during the late quaternary |
publishDate |
2011 |
url |
https://oceanrep.geomar.de/id/eprint/13472/ https://oceanrep.geomar.de/id/eprint/13472/1/2011_N%C3%BCrnberg_FB1_POZ_rtapia_AGU-2011.pdf |
geographic |
Antarctic New Zealand Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic New Zealand Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/13472/1/2011_N%C3%BCrnberg_FB1_POZ_rtapia_AGU-2011.pdf Tapia, R. I., Nürnberg, D. and Frank, M. (2011) Reconstructing the South Pacific upper water conditions during the Late Quaternary. [Poster] In: AGU Fall Meeting 2011. , 05.12.-09.12.2011, San Francisco, California, USA . |
_version_ |
1766270164858306560 |