Assessment of the southern polar and subpolar warming in the PMIP4 Last Interglacial simulations using paleoclimate data syntheses

Given relatively abundant paleo proxies, the study of the Last Interglacial (LIG, ~129-116 thousand years ago, ka) is valuable to understanding natural variability and feedback in a warmer-than-preindustrial climate. The Paleoclimate Modelling Intercomparison Project Phase 4 (PMIP4) coordinated LIG...

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Main Authors: Gao, Qinggang, Capron, Emilie, Sime, Louise C., Rhodes, Rachael H., Sivankutty, Rahul, Zhang, Xu, Otto-Bliesner, Bette L., Werner, Martin
Format: Text
Language:English
Published: 2024
Subjects:
Online Access:https://doi.org/10.5194/egusphere-2024-1261
https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1261/
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spelling ftcopernicus:oai:publications.copernicus.org:egusphere119754 2024-09-15T17:45:28+00:00 Assessment of the southern polar and subpolar warming in the PMIP4 Last Interglacial simulations using paleoclimate data syntheses Gao, Qinggang Capron, Emilie Sime, Louise C. Rhodes, Rachael H. Sivankutty, Rahul Zhang, Xu Otto-Bliesner, Bette L. Werner, Martin 2024-05-07 application/pdf https://doi.org/10.5194/egusphere-2024-1261 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1261/ eng eng doi:10.5194/egusphere-2024-1261 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1261/ eISSN: Text 2024 ftcopernicus https://doi.org/10.5194/egusphere-2024-1261 2024-08-28T05:24:15Z Given relatively abundant paleo proxies, the study of the Last Interglacial (LIG, ~129-116 thousand years ago, ka) is valuable to understanding natural variability and feedback in a warmer-than-preindustrial climate. The Paleoclimate Modelling Intercomparison Project Phase 4 (PMIP4) coordinated LIG model simulations which focus on 127 ka. Here we evaluate 12 PMIP4 127-ka Tier 1 model simulations against four recent paleoclimate syntheses of LIG sea and air temperatures and sea ice concentrations. The four syntheses include 99 reconstructions and show considerable variations, some but not all of which are attributable to the different sites included in each synthesis. All syntheses support the presence of a warmer Southern Ocean, with reduced sea ice, and a warmer Antarctica at 127 ka compared to the preindustrial. The PMIP4 127-ka Tier 1 simulations, forced solely by orbital parameters and greenhouse gas concentrations, do not capture the magnitude of this warming. Here we follow up on previous work that suggests the importance of preceding deglaciation meltwater release into the North Atlantic. We run a 3000-year 128-ka simulation using HadCM3 with a 0.25 Sv North Atlantic freshwater hosing, which approximates the PMIP4 127-ka Tier 2 H11 (Heinrich event 11) simulation. The hosed 128-ka HadCM3 simulation captures much of the warming and sea ice loss shown in the four data syntheses at 127 ka relative to preindustrial: south of 40° S, modelled annual sea surface temperature (SST) rises by 1.3±0.6 °C, while reconstructed average anomalies range from 2.2 °C to 2.7 °C; modelled summer SST increases by 1.1±0.7 °C, close to 1.2–2.2 °C reconstructed average anomalies; September sea ice area (SIA) reduces by 40 %, similar to reconstructed 40 % reduction of sea ice concentration (SIC); over the Antarctic ice sheet, modelled annual surface air temperature (SAT) increases by 2.6±0.4 °C, even larger than reconstructed average ... Text Antarc* Antarctic Antarctica Ice Sheet North Atlantic Sea ice Southern Ocean Copernicus Publications: E-Journals
institution Open Polar
collection Copernicus Publications: E-Journals
op_collection_id ftcopernicus
language English
description Given relatively abundant paleo proxies, the study of the Last Interglacial (LIG, ~129-116 thousand years ago, ka) is valuable to understanding natural variability and feedback in a warmer-than-preindustrial climate. The Paleoclimate Modelling Intercomparison Project Phase 4 (PMIP4) coordinated LIG model simulations which focus on 127 ka. Here we evaluate 12 PMIP4 127-ka Tier 1 model simulations against four recent paleoclimate syntheses of LIG sea and air temperatures and sea ice concentrations. The four syntheses include 99 reconstructions and show considerable variations, some but not all of which are attributable to the different sites included in each synthesis. All syntheses support the presence of a warmer Southern Ocean, with reduced sea ice, and a warmer Antarctica at 127 ka compared to the preindustrial. The PMIP4 127-ka Tier 1 simulations, forced solely by orbital parameters and greenhouse gas concentrations, do not capture the magnitude of this warming. Here we follow up on previous work that suggests the importance of preceding deglaciation meltwater release into the North Atlantic. We run a 3000-year 128-ka simulation using HadCM3 with a 0.25 Sv North Atlantic freshwater hosing, which approximates the PMIP4 127-ka Tier 2 H11 (Heinrich event 11) simulation. The hosed 128-ka HadCM3 simulation captures much of the warming and sea ice loss shown in the four data syntheses at 127 ka relative to preindustrial: south of 40° S, modelled annual sea surface temperature (SST) rises by 1.3±0.6 °C, while reconstructed average anomalies range from 2.2 °C to 2.7 °C; modelled summer SST increases by 1.1±0.7 °C, close to 1.2–2.2 °C reconstructed average anomalies; September sea ice area (SIA) reduces by 40 %, similar to reconstructed 40 % reduction of sea ice concentration (SIC); over the Antarctic ice sheet, modelled annual surface air temperature (SAT) increases by 2.6±0.4 °C, even larger than reconstructed average ...
format Text
author Gao, Qinggang
Capron, Emilie
Sime, Louise C.
Rhodes, Rachael H.
Sivankutty, Rahul
Zhang, Xu
Otto-Bliesner, Bette L.
Werner, Martin
spellingShingle Gao, Qinggang
Capron, Emilie
Sime, Louise C.
Rhodes, Rachael H.
Sivankutty, Rahul
Zhang, Xu
Otto-Bliesner, Bette L.
Werner, Martin
Assessment of the southern polar and subpolar warming in the PMIP4 Last Interglacial simulations using paleoclimate data syntheses
author_facet Gao, Qinggang
Capron, Emilie
Sime, Louise C.
Rhodes, Rachael H.
Sivankutty, Rahul
Zhang, Xu
Otto-Bliesner, Bette L.
Werner, Martin
author_sort Gao, Qinggang
title Assessment of the southern polar and subpolar warming in the PMIP4 Last Interglacial simulations using paleoclimate data syntheses
title_short Assessment of the southern polar and subpolar warming in the PMIP4 Last Interglacial simulations using paleoclimate data syntheses
title_full Assessment of the southern polar and subpolar warming in the PMIP4 Last Interglacial simulations using paleoclimate data syntheses
title_fullStr Assessment of the southern polar and subpolar warming in the PMIP4 Last Interglacial simulations using paleoclimate data syntheses
title_full_unstemmed Assessment of the southern polar and subpolar warming in the PMIP4 Last Interglacial simulations using paleoclimate data syntheses
title_sort assessment of the southern polar and subpolar warming in the pmip4 last interglacial simulations using paleoclimate data syntheses
publishDate 2024
url https://doi.org/10.5194/egusphere-2024-1261
https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1261/
genre Antarc*
Antarctic
Antarctica
Ice Sheet
North Atlantic
Sea ice
Southern Ocean
genre_facet Antarc*
Antarctic
Antarctica
Ice Sheet
North Atlantic
Sea ice
Southern Ocean
op_source eISSN:
op_relation doi:10.5194/egusphere-2024-1261
https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1261/
op_doi https://doi.org/10.5194/egusphere-2024-1261
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