Evolution of mean ocean temperature in Marine Isotope Stage 4
Deglaciations are characterized by relatively fast and near-synchronous changes in ice sheet volume, ocean temperature, and atmospheric greenhouse gas concentrations, but glacial inception occurs more gradually. Understanding the evolution of ice sheet, ocean, and atmosphere conditions from intergla...
Published in: | Climate of the Past |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://curis.ku.dk/portal/da/publications/evolution-of-mean-ocean-temperature-in-marine-isotope-stage-4(03b6cc75-2715-44e7-8bc2-43e4a74888d5).html https://doi.org/10.5194/cp-17-2273-2021 https://curis.ku.dk/ws/files/283801181/cp_17_2273_2021.pdf |
id |
ftcopenhagenunip:oai:pure.atira.dk:publications/03b6cc75-2715-44e7-8bc2-43e4a74888d5 |
---|---|
record_format |
openpolar |
spelling |
ftcopenhagenunip:oai:pure.atira.dk:publications/03b6cc75-2715-44e7-8bc2-43e4a74888d5 2024-06-09T07:39:57+00:00 Evolution of mean ocean temperature in Marine Isotope Stage 4 Shackleton, Sarah Menking, James A. Brook, Edward Buizert, Christo Dyonisius, Michael N. Petrenko, Vasilii V. Baggenstos, Daniel Severinghaus, Jeffrey P. 2021-10-27 application/pdf https://curis.ku.dk/portal/da/publications/evolution-of-mean-ocean-temperature-in-marine-isotope-stage-4(03b6cc75-2715-44e7-8bc2-43e4a74888d5).html https://doi.org/10.5194/cp-17-2273-2021 https://curis.ku.dk/ws/files/283801181/cp_17_2273_2021.pdf eng eng info:eu-repo/semantics/openAccess Shackleton , S , Menking , J A , Brook , E , Buizert , C , Dyonisius , M N , Petrenko , V V , Baggenstos , D & Severinghaus , J P 2021 , ' Evolution of mean ocean temperature in Marine Isotope Stage 4 ' , Climate of the Past , vol. 17 , no. 5 , pp. 2273-2289 . https://doi.org/10.5194/cp-17-2273-2021 MERIDIONAL OVERTURNING CIRCULATION SEA-LEVEL GLACIAL MAXIMUM ICE VOLUME CLIMATE RECORD CARBON ATLANTIC DELTA-O-18 GASES article 2021 ftcopenhagenunip https://doi.org/10.5194/cp-17-2273-2021 2024-05-16T11:29:21Z Deglaciations are characterized by relatively fast and near-synchronous changes in ice sheet volume, ocean temperature, and atmospheric greenhouse gas concentrations, but glacial inception occurs more gradually. Understanding the evolution of ice sheet, ocean, and atmosphere conditions from interglacial to glacial maximum provides insight into the interplay of these components of the climate system. Using noble gas measurements in ancient ice samples, we reconstruct mean ocean temperature (MOT) from 74 to 59.7 ka, covering the Marine Isotope Stage (MIS) 5a-4 boundary, MIS 4, and part of the MIS 4-3 transition. Comparing this MOT reconstruction to previously published MOT reconstructions from the last and penultimate deglaciation, we find that the majority of the last interglacial-glacial ocean cooling must have occurred within MIS 5. MOT reached equally cold conditions in MIS 4 as in MIS 2 (-2.7 +/- 0.3 degrees C relative to the Holocene, -0.1 +/- 0.3 degrees C relative to MIS 2). Using a carbon cycle model to quantify the CO2 solubility pump, we show that ocean cooling can explain most of the CO2 drawdown (32 +/- 4 of 40 ppm) across MIS 5. Comparing MOT to contemporaneous records of benthic delta O-18, we find that ocean cooling can also explain the majority of the delta O-18 increase across MIS 5 (0.7 parts per thousand of 1.3 parts per thousand). The timing of ocean warming and cooling in the record and the comparison to coeval Antarctic isotope data suggest an intimate link between ocean heat content, Southern Hemisphere high-latitude climate, and ocean circulation on orbital and millennial timescales. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet University of Copenhagen: Research Antarctic Climate of the Past 17 5 2273 2289 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
MERIDIONAL OVERTURNING CIRCULATION SEA-LEVEL GLACIAL MAXIMUM ICE VOLUME CLIMATE RECORD CARBON ATLANTIC DELTA-O-18 GASES |
spellingShingle |
MERIDIONAL OVERTURNING CIRCULATION SEA-LEVEL GLACIAL MAXIMUM ICE VOLUME CLIMATE RECORD CARBON ATLANTIC DELTA-O-18 GASES Shackleton, Sarah Menking, James A. Brook, Edward Buizert, Christo Dyonisius, Michael N. Petrenko, Vasilii V. Baggenstos, Daniel Severinghaus, Jeffrey P. Evolution of mean ocean temperature in Marine Isotope Stage 4 |
topic_facet |
MERIDIONAL OVERTURNING CIRCULATION SEA-LEVEL GLACIAL MAXIMUM ICE VOLUME CLIMATE RECORD CARBON ATLANTIC DELTA-O-18 GASES |
description |
Deglaciations are characterized by relatively fast and near-synchronous changes in ice sheet volume, ocean temperature, and atmospheric greenhouse gas concentrations, but glacial inception occurs more gradually. Understanding the evolution of ice sheet, ocean, and atmosphere conditions from interglacial to glacial maximum provides insight into the interplay of these components of the climate system. Using noble gas measurements in ancient ice samples, we reconstruct mean ocean temperature (MOT) from 74 to 59.7 ka, covering the Marine Isotope Stage (MIS) 5a-4 boundary, MIS 4, and part of the MIS 4-3 transition. Comparing this MOT reconstruction to previously published MOT reconstructions from the last and penultimate deglaciation, we find that the majority of the last interglacial-glacial ocean cooling must have occurred within MIS 5. MOT reached equally cold conditions in MIS 4 as in MIS 2 (-2.7 +/- 0.3 degrees C relative to the Holocene, -0.1 +/- 0.3 degrees C relative to MIS 2). Using a carbon cycle model to quantify the CO2 solubility pump, we show that ocean cooling can explain most of the CO2 drawdown (32 +/- 4 of 40 ppm) across MIS 5. Comparing MOT to contemporaneous records of benthic delta O-18, we find that ocean cooling can also explain the majority of the delta O-18 increase across MIS 5 (0.7 parts per thousand of 1.3 parts per thousand). The timing of ocean warming and cooling in the record and the comparison to coeval Antarctic isotope data suggest an intimate link between ocean heat content, Southern Hemisphere high-latitude climate, and ocean circulation on orbital and millennial timescales. |
format |
Article in Journal/Newspaper |
author |
Shackleton, Sarah Menking, James A. Brook, Edward Buizert, Christo Dyonisius, Michael N. Petrenko, Vasilii V. Baggenstos, Daniel Severinghaus, Jeffrey P. |
author_facet |
Shackleton, Sarah Menking, James A. Brook, Edward Buizert, Christo Dyonisius, Michael N. Petrenko, Vasilii V. Baggenstos, Daniel Severinghaus, Jeffrey P. |
author_sort |
Shackleton, Sarah |
title |
Evolution of mean ocean temperature in Marine Isotope Stage 4 |
title_short |
Evolution of mean ocean temperature in Marine Isotope Stage 4 |
title_full |
Evolution of mean ocean temperature in Marine Isotope Stage 4 |
title_fullStr |
Evolution of mean ocean temperature in Marine Isotope Stage 4 |
title_full_unstemmed |
Evolution of mean ocean temperature in Marine Isotope Stage 4 |
title_sort |
evolution of mean ocean temperature in marine isotope stage 4 |
publishDate |
2021 |
url |
https://curis.ku.dk/portal/da/publications/evolution-of-mean-ocean-temperature-in-marine-isotope-stage-4(03b6cc75-2715-44e7-8bc2-43e4a74888d5).html https://doi.org/10.5194/cp-17-2273-2021 https://curis.ku.dk/ws/files/283801181/cp_17_2273_2021.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Shackleton , S , Menking , J A , Brook , E , Buizert , C , Dyonisius , M N , Petrenko , V V , Baggenstos , D & Severinghaus , J P 2021 , ' Evolution of mean ocean temperature in Marine Isotope Stage 4 ' , Climate of the Past , vol. 17 , no. 5 , pp. 2273-2289 . https://doi.org/10.5194/cp-17-2273-2021 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-17-2273-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
5 |
container_start_page |
2273 |
op_container_end_page |
2289 |
_version_ |
1801383365569413120 |