Oceanic response to changes in the WAIS and astronomical forcing during the MIS31 superinterglacial

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doi: 10.5194/cp-13-1081-2017
Author(s): Justino, Flavio; Lindemann, Douglas; Kucharski, Fred; Wilson, Aaron; Bromwich, David; Stordal, Frode
Author Affiliation(s): Primary:
Universidade Federal de Vicosa, Department of Agricultural Engineering, Vicosa, Brazil
Abdus Salam International Centre for Theoretical Physics, Italy
Ohio State University, United States
University of Oslo, Norway
Volume Title: Climate of the Past
Source: Climate of the Past, 13(9), p.1081-1095. Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1814-9324
Note: In English. 91 refs.; illus., incl. 2 tables
Summary: Marine Isotope Stage 31 (MIS31, between 1085 and 1055 ka) was characterized by higher extratropical air temperatures and a substantial recession of polar glaciers compared to today. Paleoreconstructions and model simulations have increased the understanding of the MIS31 interval, but questions remain regarding the role of the Atlantic and Pacific oceans in modifying the climate associated with the variations in Earth's orbital parameters. Multi-century coupled climate simulations, with the astronomical configuration of the MIS31 and modified West Antarctic Ice Sheet (WAIS) topography, show an increase in the thermohaline flux and northward oceanic heat transport (OHT) in the Pacific Ocean. These oceanic changes are driven by anomalous atmospheric circulation and increased surface salinity in concert with a stronger meridional overturning circulation (MOC). The intensified northward OHT is responsible for up to 85 % of the global OHT anomalies and contributes to the overall reduction in sea ice in the Northern Hemisphere (NH) due to Earth's astronomical configuration. The relative contributions of the Atlantic Ocean to global OHT and MOC anomalies are minor compared to those of the Pacific. However, sea ice changes are remarkable, highlighted by decreased (increased) cover in the Ross (Weddell) Sea but widespread reductions in sea ice across the NH.
Year of Publication: 2017
Research Program: DSDP Deep Sea Drilling Project
IODP Integrated Ocean Drilling Program
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Antarctic ice sheet; Antarctica; Arabian Sea; Atlantic Meridional Overturning Circulation; Atlantic Ocean; Atmospheric circulation; Cape Basin; Carbon dioxide; Cenozoic; Chatham Rise; Climate forcing; Concentration; DSDP Site 607; Deep Sea Drilling Project; Deglaciation; East Pacific; Equatorial Pacific; Expedition 306; Expeditions 303/306; Glaciers; Heat transfer; IODP Site U1313; IPOD; Ice; Ice cover; Indian Ocean; Insolation; Integrated Ocean Drilling Program; Interglacial environment; Leg 117; Leg 138; Leg 144; Leg 162; Leg 175; Leg 177; Leg 181; Leg 184; Leg 94; MIS 31; Mid-Atlantic Ridge; Models; North Atlantic; North Pacific; Northeast Atlantic; Northeast Pacific; Northern Hemisphere; Northwest Pacific; ODP Site 1087; ODP Site 1090; ODP Site 1123; ODP Site 1143; ODP Site 1146; ODP Site 722; ODP Site 846; ODP Site 847; ODP Site 849; ODP Site 871; ODP Site 982; Ocean Drilling Program; Ocean circulation; Orbital forcing; Pacific Ocean; Paleoclimatology; Precession; Quaternary; Reconstruction; Rockall Bank; Ross Sea; Salinity; Sea ice; Sea surface water; Sea water; Sea-surface temperature; Seasonal variations; Sensitivity analysis; Simulation; South Atlantic; South China Sea; South Pacific; Southeast Pacific; Southern Ocean; Statistical analysis; Temperature; Thermohaline circulation; Weddell Sea; West Antarctic ice sheet; West Pacific
Record ID: 2018003547
Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany

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