Centennial-Scale Elemental and Isotopic Variability in the Tropical and Subtropical North Atlantic Ocean

The marine geochemistry of the North Atlantic Ocean varies on decadal to centennial time scales, a consequence of natural and anthropogenic forcing. Surface corals provide a useful geochemical archive to quantify past mixed layer variability, and this study presents elemental and isotopic records fr...

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Bibliographic Details
Main Author: Reuer, Matthew K.
Other Authors: MASSACHUSETTS INST OF TECH CAMBRIDGE
Format: Text
Language:English
Published: 2002
Subjects:
Physical and Dynamic Oceanography
Biological Oceanography
*NORTH ATLANTIC OCEAN
*GEOCHEMISTRY
THESES
PROFILES
CADMIUM
MIXED LAYER(MARINE)
BARIUM
THERMOCLINES
TRACE ELEMENTS
SUBTROPICAL REGIONS
LEAD(METAL)
CORAL
CARIACO BASIN
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/ADA406022
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA406022
Description
Summary:The marine geochemistry of the North Atlantic Ocean varies on decadal to centennial time scales, a consequence of natural and anthropogenic forcing. Surface corals provide a useful geochemical archive to quantify past mixed layer variability, and this study presents elemental and isotopic records from the tropical and subtropical North Atlantic. A consistent method for stable lead isotope analysis via multiple collector ICP-MS is first presented. This method is then applied to western North Atlantic surface corals and seawater, constraining historical elemental and isotopic lead variability. Six stable lead isotope profiles are developed from the western and eastern North Atlantic, demonstrating consistent mixed layer, thermocline, and deep water variability. Finally, coralline trace element records, including cadmium, barium, and lead, are presented from the Cariaco Basin. Prepared in cooperation with Woods Whole Oceanographic Institution, MA

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