Last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°S, resampled to 2000 year resolution
Southern Ocean marine sediments provide an important archive of Quaternary glacial-interglacial climate changes. Sea surface temperature (SST) reconstructions in the Southern Ocean depend exclusively on the fossils or geochemical signatures of planktic organisms, but the strengths of these SST proxi...
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Format: | Dataset |
Language: | English |
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PANGAEA
2021
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.938621 https://doi.org/10.1594/PANGAEA.938621 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.938621 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AGE Alkenone Confidence interval Diatom assemblage Eemian Foraminiferal assemblages Interglacial Last Interglacial marine isotope stage 5 marine isotope stage 6 Marine Sediment Core Mg/Ca MULT Multiple investigations Number of observations Penultimate Glacial Maximum proxy Sea surface temperature anomaly standard deviation Southern_Ocean Southern Ocean TIPACCs Tipping Points in Antarctic Climate Components |
spellingShingle |
AGE Alkenone Confidence interval Diatom assemblage Eemian Foraminiferal assemblages Interglacial Last Interglacial marine isotope stage 5 marine isotope stage 6 Marine Sediment Core Mg/Ca MULT Multiple investigations Number of observations Penultimate Glacial Maximum proxy Sea surface temperature anomaly standard deviation Southern_Ocean Southern Ocean TIPACCs Tipping Points in Antarctic Climate Components Chandler, David M Langebroek, Petra M Last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°S, resampled to 2000 year resolution |
topic_facet |
AGE Alkenone Confidence interval Diatom assemblage Eemian Foraminiferal assemblages Interglacial Last Interglacial marine isotope stage 5 marine isotope stage 6 Marine Sediment Core Mg/Ca MULT Multiple investigations Number of observations Penultimate Glacial Maximum proxy Sea surface temperature anomaly standard deviation Southern_Ocean Southern Ocean TIPACCs Tipping Points in Antarctic Climate Components |
description |
Southern Ocean marine sediments provide an important archive of Quaternary glacial-interglacial climate changes. Sea surface temperature (SST) reconstructions in the Southern Ocean depend exclusively on the fossils or geochemical signatures of planktic organisms, but the strengths of these SST proxies remain poorly quantified in this region. To improve confidence in Southern Ocean paleoclimate reconstructions, we first evaluated the reliability of SST proxies employed at Quaternary glacial-interglacial time scales, focusing on three key potential problems: advection/dispersion, seasonality, and non-thermal influences. On that basis, we selected foraminifera assemblages, long-chain alkenones (UK'37 index), diatom assemblages, and the Globigerina bulloides Mg/Ca ratio as the most reliable SST proxies in the Southern Ocean. We also revised calibrations where appropriate, using core-top sediment databases. Overall, Southern Ocean SST reconstructions using these recommended proxies and calibrations should be robust when averaging across multiple sites and proxy types, but should be treated with caution when analysing spatial variability, a small number of sites, or a single proxy type. We have applied these recommendations to a synthesis of Southern Ocean SST over the penultimate glacial and last interglacial (LIG). Similar to previous studies, we find that LIG warming at 40°S to 60°S reached 1.6 ± 1.1°C (annual mean) or 1.9 ± 1.3°C (austral summer: JFM) relative to present. Annual / summer cooling in the penultimate glacial maximum reached -3.6 ± 1.0°C / -4.0 ± 1.2°C, similar to the last glacial maximum. Compared with the previous LIG SST syntheses, our reported uncertainties more strongly reflect geographic variability and dating errors, as we have reduced errors in the individual temperature reconstructions and do not date records by aligning peaks in their SST. |
format |
Dataset |
author |
Chandler, David M Langebroek, Petra M |
author_facet |
Chandler, David M Langebroek, Petra M |
author_sort |
Chandler, David M |
title |
Last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°S, resampled to 2000 year resolution |
title_short |
Last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°S, resampled to 2000 year resolution |
title_full |
Last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°S, resampled to 2000 year resolution |
title_fullStr |
Last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°S, resampled to 2000 year resolution |
title_full_unstemmed |
Last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°S, resampled to 2000 year resolution |
title_sort |
last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°s, resampled to 2000 year resolution |
publisher |
PANGAEA |
publishDate |
2021 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.938621 https://doi.org/10.1594/PANGAEA.938621 |
op_coverage |
MEDIAN LATITUDE: -60.000000 * MEDIAN LONGITUDE: 180.000000 * SOUTH-BOUND LATITUDE: -80.000000 * WEST-BOUND LONGITUDE: 180.000000 * NORTH-BOUND LATITUDE: -40.000000 * EAST-BOUND LONGITUDE: 180.000000 |
long_lat |
ENVELOPE(180.000000,180.000000,-40.000000,-80.000000) |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
Chandler, David M; Langebroek, Petra M (2021): Last interglacial and penultimate glacial sea surface temperature anomalies for the region south of 40°S, resampled to 2000 year resolution [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.938620 Chandler, David M; Langebroek, Petra M (2021): Southern Ocean sea surface temperature synthesis: Part 1. Evaluation of temperature proxies at glacial-interglacial time scales. Quaternary Science Reviews, 271, 107191, https://doi.org/10.1016/j.quascirev.2021.107191 Chandler, David M; Langebroek, Petra M (2021): Southern Ocean sea surface temperature synthesis: Part 2. Penultimate glacial and last interglacial. Quaternary Science Reviews, 271, 107190, https://doi.org/10.1016/j.quascirev.2021.107190 Locarnini, Ricardo A; Mishonov, Alexey V; Baranova, O; Boyer, Timothy P; Zweng, M M; Garcia, H E; Reagan, James R; Seidov, Dan; Weathers, Katharine W; Paver, Christopher R; Smolyar, I (2019): World Ocean Atlas 2018, Volume 1: Temperature. In: Mishonov, A. (Technical Ed.), NOAA Atlas NESDIS 81, 52pp., https://www.ncei.noaa.gov/products/ocean-climate-laboratory https://doi.pangaea.de/10.1594/PANGAEA.938621 https://doi.org/10.1594/PANGAEA.938621 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.93862110.1594/PANGAEA.93862010.1016/j.quascirev.2021.10719110.1016/j.quascirev.2021.107190 |
_version_ |
1810497687483580416 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.938621 2024-09-15T17:47:57+00:00 Last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°S, resampled to 2000 year resolution Chandler, David M Langebroek, Petra M MEDIAN LATITUDE: -60.000000 * MEDIAN LONGITUDE: 180.000000 * SOUTH-BOUND LATITUDE: -80.000000 * WEST-BOUND LONGITUDE: 180.000000 * NORTH-BOUND LATITUDE: -40.000000 * EAST-BOUND LONGITUDE: 180.000000 2021 text/tab-separated-values, 848 data points https://doi.pangaea.de/10.1594/PANGAEA.938621 https://doi.org/10.1594/PANGAEA.938621 en eng PANGAEA Chandler, David M; Langebroek, Petra M (2021): Last interglacial and penultimate glacial sea surface temperature anomalies for the region south of 40°S, resampled to 2000 year resolution [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.938620 Chandler, David M; Langebroek, Petra M (2021): Southern Ocean sea surface temperature synthesis: Part 1. Evaluation of temperature proxies at glacial-interglacial time scales. Quaternary Science Reviews, 271, 107191, https://doi.org/10.1016/j.quascirev.2021.107191 Chandler, David M; Langebroek, Petra M (2021): Southern Ocean sea surface temperature synthesis: Part 2. Penultimate glacial and last interglacial. Quaternary Science Reviews, 271, 107190, https://doi.org/10.1016/j.quascirev.2021.107190 Locarnini, Ricardo A; Mishonov, Alexey V; Baranova, O; Boyer, Timothy P; Zweng, M M; Garcia, H E; Reagan, James R; Seidov, Dan; Weathers, Katharine W; Paver, Christopher R; Smolyar, I (2019): World Ocean Atlas 2018, Volume 1: Temperature. In: Mishonov, A. (Technical Ed.), NOAA Atlas NESDIS 81, 52pp., https://www.ncei.noaa.gov/products/ocean-climate-laboratory https://doi.pangaea.de/10.1594/PANGAEA.938621 https://doi.org/10.1594/PANGAEA.938621 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess AGE Alkenone Confidence interval Diatom assemblage Eemian Foraminiferal assemblages Interglacial Last Interglacial marine isotope stage 5 marine isotope stage 6 Marine Sediment Core Mg/Ca MULT Multiple investigations Number of observations Penultimate Glacial Maximum proxy Sea surface temperature anomaly standard deviation Southern_Ocean Southern Ocean TIPACCs Tipping Points in Antarctic Climate Components dataset 2021 ftpangaea https://doi.org/10.1594/PANGAEA.93862110.1594/PANGAEA.93862010.1016/j.quascirev.2021.10719110.1016/j.quascirev.2021.107190 2024-08-21T00:02:27Z Southern Ocean marine sediments provide an important archive of Quaternary glacial-interglacial climate changes. Sea surface temperature (SST) reconstructions in the Southern Ocean depend exclusively on the fossils or geochemical signatures of planktic organisms, but the strengths of these SST proxies remain poorly quantified in this region. To improve confidence in Southern Ocean paleoclimate reconstructions, we first evaluated the reliability of SST proxies employed at Quaternary glacial-interglacial time scales, focusing on three key potential problems: advection/dispersion, seasonality, and non-thermal influences. On that basis, we selected foraminifera assemblages, long-chain alkenones (UK'37 index), diatom assemblages, and the Globigerina bulloides Mg/Ca ratio as the most reliable SST proxies in the Southern Ocean. We also revised calibrations where appropriate, using core-top sediment databases. Overall, Southern Ocean SST reconstructions using these recommended proxies and calibrations should be robust when averaging across multiple sites and proxy types, but should be treated with caution when analysing spatial variability, a small number of sites, or a single proxy type. We have applied these recommendations to a synthesis of Southern Ocean SST over the penultimate glacial and last interglacial (LIG). Similar to previous studies, we find that LIG warming at 40°S to 60°S reached 1.6 ± 1.1°C (annual mean) or 1.9 ± 1.3°C (austral summer: JFM) relative to present. Annual / summer cooling in the penultimate glacial maximum reached -3.6 ± 1.0°C / -4.0 ± 1.2°C, similar to the last glacial maximum. Compared with the previous LIG SST syntheses, our reported uncertainties more strongly reflect geographic variability and dating errors, as we have reduced errors in the individual temperature reconstructions and do not date records by aligning peaks in their SST. Dataset Antarc* Antarctic Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(180.000000,180.000000,-40.000000,-80.000000) |