Glacial-interglacial changes in nutrient utilization in the Equatorial Pacific Ocean

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doi: 10.1038/377514a0
Author(s): Farrell, J. W.; Pedersen, T. F.; Calvert, S. E.; Nielsen, B.
Author Affiliation(s): Primary:
University of British Columbia, Department of Oceanography, Vancouver, BC, Canada
Volume Title: Nature (London)
Source: Nature (London), 377(6549), p.514-517. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836 CODEN: NATUAS
Note: In English. 33 refs.; illus.
Summary: The 15N/14N ratio of sedimentary marine organic matter is used to show spatial gradients in relative nitrate use throughout the modern E equatorial Pacific (EEP). Down-core decline in this ratio through the Last Glacial Maximum (12-24 000 yr ago) is a decrease in the relative nitrate utilization. The increase in nitrate supply to surface waters due to upwelling over this time was >><[dollar]I> the apparent increase in N2 removal by organic matter export from surface waters. This is consistent with a cooler sea-surface T and a higher CO2 flux to the atmosphere during the Last Glacial Maximum; the EEP surface waters remained rich in nutrients and were not a sink for CO2 for the past ≥ 30 000 yr.
Year of Publication: 1995
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; 24 Surficial Geology, Quaternary Geology; Carbon dioxide; Cenozoic; Cores; East Pacific; Equatorial Pacific; Geochemical cycle; Geochemistry; Glacial environment; Glaciomarine environment; Interglacial environment; Isotopes; Last glacial maximum; Marine environment; Marine sediments; N-15/N-14; Nitrates; Nitrogen; Nutrients; Organic compounds; Organic materials; Pacific Ocean; Paleoecology; Productivity; Quaternary; Sea water; Sediments; Stable isotopes; Tropical environment; Upper Quaternary
Record ID: 1996001817
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom

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