Evolution of mean ocean temperature in Marine Isotope Stage 4
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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.
In: Climate of the Past, Vol. 17, No. 5, 27.10.2021, p. 2273-2289.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Evolution of mean ocean temperature in Marine Isotope Stage 4
AU - Shackleton, Sarah
AU - Menking, James A.
AU - Brook, Edward
AU - Buizert, Christo
AU - Dyonisius, Michael N.
AU - Petrenko, Vasilii V.
AU - Baggenstos, Daniel
AU - Severinghaus, Jeffrey P.
PY - 2021/10/27
Y1 - 2021/10/27
N2 - 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.
AB - 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.
KW - MERIDIONAL OVERTURNING CIRCULATION
KW - SEA-LEVEL
KW - GLACIAL MAXIMUM
KW - ICE VOLUME
KW - CLIMATE
KW - RECORD
KW - CARBON
KW - ATLANTIC
KW - DELTA-O-18
KW - GASES
U2 - 10.5194/cp-17-2273-2021
DO - 10.5194/cp-17-2273-2021
M3 - Journal article
VL - 17
SP - 2273
EP - 2289
JO - Climate of the Past
JF - Climate of the Past
SN - 1814-9324
IS - 5
ER -
ID: 283801177