Last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°S, resampled to 2000 year resolution

doi:doi:10.1594/PANGAEA.938621

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 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.

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Chandler, David M, Langebroek, Petra M (2021). Dataset: Last interglacial and penultimate glacial sea surface temperature anomalies: summary statistics for the region south of 40°S, resampled to 2000 year resolution. https://doi.org/10.1594/PANGAEA.938621

DOI retrieved: 2021

Additional Info

Field	Value
Imported on	November 30, 2024
Last update	November 30, 2024
License	CC-BY-4.0
Source	https://doi.org/10.1594/PANGAEA.938621
Author	Chandler, David M
Given Name	David M
Family Name	Chandler
More Authors	Langebroek, Petra M
Source Creation	2021
Publication Year	2021
Resource Type	text/tab-separated-values - filename: Chandler-Langebroek_2021_SST-anom-stats
Subject Areas	Name: LandSurface Name: Lithosphere
Related Identifiers	Title: Last interglacial and penultimate glacial sea surface temperature anomalies for the region south of 40°S, resampled to 2000 year resolution Identifier: https://doi.org/10.1594/PANGAEA.938620 Type: DOI Relation: References Year: 2021 Authors: Chandler David M , Langebroek Petra M , Chandler David M , Langebroek Petra M , Chandler David M , Langebroek Petra M , 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 . Title: Southern Ocean sea surface temperature synthesis: Part 1. Evaluation of temperature proxies at glacial-interglacial time scales Identifier: https://doi.org/10.1016/j.quascirev.2021.107191 Type: DOI Relation: References Year: 2021 Source: Quaternary Science Reviews Authors: Chandler David M , Langebroek Petra M , Chandler David M , Langebroek Petra M , Chandler David M , Langebroek Petra M , 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 . Title: Southern Ocean sea surface temperature synthesis: Part 2. Penultimate glacial and last interglacial Identifier: https://doi.org/10.1016/j.quascirev.2021.107190 Type: DOI Relation: References Year: 2021 Source: Quaternary Science Reviews Authors: Chandler David M , Langebroek Petra M , Chandler David M , Langebroek Petra M , Chandler David M , Langebroek Petra M , 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 . Title: World Ocean Atlas 2018, Volume 1: Temperature Identifier: https://www.ncei.noaa.gov/products/ocean-climate-laboratory Type: DOI Relation: References Year: 2019 Source: In: Mishonov, A.. (Technical Ed.), NOAA Atlas NESDIS 81 Authors: Chandler David M , Langebroek Petra M , Chandler David M , Langebroek Petra M , Chandler David M , Langebroek Petra M , 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 .