Salinity changes in the North West Pacific Ocean during the late Pliocene/early Quaternary from 2.73 Ma to 2.52 Ma

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doi: 10.1016/j.epsl.2010.06.035
Author(s): Swann, George E. A.
Author Affiliation(s): Primary:
British Geological Survey, Natural Environment Research Council Isotope Geosciences Laboratory, Keyworth, United Kingdom
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, 297(1-2), p.332-338. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. Supplementary data available in online version. 74 refs.; illus., incl. sketch map
Summary: Recent research has increasingly advocated a role for the North Pacific Ocean in modulating global climatic changes over both the last glacial cycle and further back into the geological record. Here a diatom δ18O record is presented from Ocean Drilling Program Site 882 over the Pliocene/Quaternary boundary from 2.73 Ma to 2.52 Ma (MIS G6-MIS 99). Large changes in δ18Odiatom of c. 4 ppm from 2.73 Ma onwards are documented to occur on a timeframe broadly coinciding with glacial-interglacial cycles. These changes are primarily attributed to large scale inputs of meltwater from glacials surrounding the North Pacific Basin and the Bering Sea. Despite these inputs and associated change in surface water salinity, on the basis of existing opal and Uk37 temperature data and new modelled water column densities, no evidence exists to suggests a removal of the halocline stratification or a resumption of the high productivity system similar to that which prevailed prior to 2.73 Ma. The permanence of the halocline suggests that the region played a key role in driving global climatic changes over the early glacial-interglacial cycles that followed the onset of major Northern Hemisphere Glaciation by inhibiting deep water upwelling and ventilation of CO2 to the atmosphere. Abstract Copyright (2010) Elsevier, B.V.
Year of Publication: 2010
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Atmosphere; Carbon dioxide; Cenozoic; Climate change; Diatoms; Emperor Seamounts; Glaciation; Halocline; Isotope ratios; Isotopes; Leg 145; Lower Quaternary; Meltwater; Microfossils; Neogene; North Pacific; Northwest Pacific; O-18/O-16; ODP Site 882; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleosalinity; Plantae; Pleistocene; Pliocene; Productivity; Quaternary; Salinity; Stable isotopes; Tertiary; Upper Pliocene; Upwelling; West Pacific
Coordinates: N502148 N502148 E1673600 E1673600
Record ID: 2010100500
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands