Atlantic overturning responses to obliquity and precession over the last 3 Myr

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doi: 10.1002/2013PA002505
Author(s): Lisiecki, L. E.
Author Affiliation(s): Primary:
University of California at Santa Barbara, Department of Earth Science, Santa Barbara, CA, United States
Volume Title: Paleoceanography
Source: Paleoceanography, 29(2), p.71-86. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. NSF Grant MGG-0926735. 78 refs.; illus., incl. 2 tables, sketch map
Summary: This study analyzes 39 Atlantic and seven Pacific benthic δ13C records to characterize obliquity and precession responses in Atlantic overturning since 3 Ma. Regional benthic δ13C stacks are also analyzed. A major transition in orbital responses is observed at 1.5-1.6 Ma coincident with the first glacial shoaling of Northern Component Water. Since ∼1.5 Ma, the phases of Atlantic benthic δ13C records from 2300 to 4000 m depth lag maximum obliquity by 59° (6.7 kyr) and June perihelion precession forcing by 133° (8.5 kyr). Comparison with North Atlantic sea surface temperature suggests that these orbital responses (particularly precession) in middle deep Atlantic δ13C are associated with changes in ocean heat transport and overturning rates. The mid-Pleistocene transition had little effect on the obliquity and precession phases of benthic δ13C but did result in a ∼50% decrease in the obliquity power of middle deep Atlantic δ13C at 0.6 Ma. Abstract Copyright (2014),. American Geophysical Union. All Rights Reserved.
Year of Publication: 2014
Research Program: DSDP Deep Sea Drilling Project
IODP Integrated Ocean Drilling Program
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; C-13/C-12; Cape Basin; Cape Verde Rise; Carbon; Caribbean Sea; Ceara Rise; Cenozoic; Chatham Rise; Chemostratigraphy; Climate forcing; DSDP Site 502; DSDP Site 552; DSDP Site 607; Deep Sea Drilling Project; East Pacific; Equatorial Atlantic; Equatorial Pacific; Expedition 303; Expedition 306; Expeditions 303/306; IODP Site U1308; IODP Site U1314; IPOD; Integrated Ocean Drilling Program; Isotope ratios; Isotopes; Leg 108; Leg 111; Leg 138; Leg 154; Leg 162; Leg 177; Leg 181; Leg 184; Leg 198; Leg 68; Leg 81; Leg 94; Mid-Atlantic Ridge; Milankovitch theory; Neogene; North Atlantic; North Pacific; Northeast Atlantic; Northeast Pacific; Northern Component Water; Northwest Pacific; O-18/O-16; ODP Site 1088; ODP Site 1089; ODP Site 1090; ODP Site 1123; ODP Site 1143; ODP Site 1208; ODP Site 658; ODP Site 659; ODP Site 664; ODP Site 677; ODP Site 846; ODP Site 849; ODP Site 925; ODP Site 926; ODP Site 927; ODP Site 928; ODP Site 929; ODP Site 980; ODP Site 982; ODP Site 983; ODP Site 984; Obliquity of the ecliptic; Ocean Drilling Program; Orbital forcing; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleotemperature; Pleistocene; Pliocene; Precession; Quaternary; Reykjanes Ridge; Rockall Bank; Rockall Plateau; Sea-surface temperature; Shatsky Rise; South Atlantic; South China Sea; South Pacific; Southeast Pacific; Stable isotopes; Tertiary; Upper Pliocene; West Pacific
Coordinates: N011000 N113000 W0792000 W0954500
S540000 S405600 E0140000 E0050000
N560233 N560234 W0231323 W0231324
N552838 N772026 W0062700 W0240457
Record ID: 2014032085
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom