Mode transitions in Northern Hemisphere glaciation; co-evolution of millennial and orbital variability in Quaternary climate

Online Access: Get full text
doi: 10.5194/cp-12-1805-2016
Author(s): Hodell, David A.; Channell, James E. T.
Author Affiliation(s): Primary:
Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, Cambridge, United Kingdom
University of Florida, United States
Volume Title: Climate of the Past
Source: Climate of the Past, 12(9), p.1805-1828. Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1814-9324
Note: In English. 124 refs.; illus., incl. sketch map
Summary: We present a 3.2 Myr record of stable isotopes and physical properties at IODP Site U1308 (reoccupation of DSDP Site 609) located within the ice-rafted detritus (IRD) belt of the North Atlantic. We compare the isotope and lithological proxies at Site U1308 with other North Atlantic records (e.g., sites 982, 607/U1313, and U1304) to reconstruct the history of orbital and millennial-scale climate variability during the Quaternary. The Site U1308 record documents a progressive increase in the intensity of Northern Hemisphere glacial-interglacial cycles during the late Pliocene and Quaternary, with mode transitions at ∼ 2.7, 1.5, 0.9, and 0.65 Ma. These transitions mark times of change in the growth and stability of Northern Hemisphere ice sheets. They also coincide with increases in vertical carbon isotope gradients between the intermediate and deep ocean, suggesting changes in deep carbon storage and atmospheric CO2. Orbital and millennial climate variability co-evolved during the Quaternary such that the trend towards larger and thicker ice sheets was accompanied by changes in the style, frequency, and intensity of millennial-scale variability. This co-evolution may be important for explaining the observed patterns of Quaternary climate change.
Year of Publication: 2016
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; Atlantic Ocean; C-13/C-12; Carbon; Carbon dioxide; Carbonates; Cenozoic; Chronology; Climate change; Climate forcing; Cores; Cyclic processes; DSDP Site 607; DSDP Site 609; Deep Sea Drilling Project; Deep-sea environment; Density; Detrital sedimentation; Expedition 303; Expedition 306; Expeditions 303/306; Foraminifera; Glacial environment; Glacial extent; Glacial geology; Glaciation; Global; Grain size; Heinrich events; IODP Site U1302; IODP Site U1303; IODP Site U1304; IODP Site U1308; IODP Site U1313; IPOD; Ice cores; Ice rafting; Ice sheets; Integrated Ocean Drilling Program; Intensity; Interglacial environment; Invertebrata; Isotope ratios; Isotopes; Leg 162; Leg 94; Magnetic susceptibility; Marine environment; Marine sediments; Microfossils; Mid-Atlantic Ridge; Natural gamma radiation; North Atlantic; Northeast Atlantic; Northern Hemisphere; Northwest Atlantic; O-18/O-16; ODP Site 982; Ocean Drilling Program; Ocean circulation; Orbital forcing; Oxygen; Paleo-oceanography; Paleoclimatology; Periodicity; Physical properties; Pleistocene; Protista; Quaternary; Rockall Bank; Sea water; Sedimentation; Sediments; Stable isotopes; Statistical analysis; Storage; Temporal distribution; Time series analysis; Variations; Ventilation
Coordinates: N495300 N495300 W0241400 W0241400
N573100 N573100 W0155200 W0155200
N410000 N410000 W0325700 W0325700
N530300 N530300 W0333200 W0333200
Record ID: 2017016944
Copyright Information: GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany