Campus Units

Geological and Atmospheric Sciences

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

12-2017

Journal or Book Title

Global Biogeochemical Cycles

Volume

31

Issue

12

First Page

1718

Last Page

1735

DOI

10.1002/2017GB005708

Abstract

Given the rapid increase in atmospheric carbon dioxide concentrations (pCO2) over the industrial era there is a pressing need to construct long term records of natural carbon cycling prior to this perturbation and to develop a more robust understanding of the role the oceans play in the sequestration of atmospheric carbon. Here we reconstruct the historical biological and climatic controls on the carbon isotopic (d13C-shell) composition of the North Icelandic shelf waters over the last millennium derived from the shells of the long-lived marine bivalve mollusc Arctica islandica. Variability in the annually resolved d13C-shell record is dominated by multi-decadal variability with a negative trend (-0.003±0.002‰yr-1) over the industrial era (1800-2000 CE). This trend is consistent with the marine Suess effect brought about by the sequestration of isotopically light carbon (d13C of CO2) derived from the burning of fossil fuels. Comparison of the d13C-shell record with contemporary proxy archives, over the last millennium, and instrumental data over the 20th century, highlight that both biological (primary production) and physical environmental factors such as relative shifts in the proportion of Subpolar Mode Waters and Arctic Intermediate Waters entrained onto the North Icelandic shelf, atmospheric circulation patterns associated with the winter North Atlantic Oscillation, and subpolar gyre sea surface temperatures and salinity, are the likely mechanisms that contribute to natural variations in seawater d13C variability on the North Icelandic shelf. Contrasting d13C fractionation processes associated with these biological and physical mechanisms likely cause the attenuated local marine Suess effect signal at this locality.

Comments

This is a manuscript of an article published as Reynolds, David J., Ian R. Hall, J. D. Scourse, C. A. Richardson, A. D. Wanamaker, and P. G. Butler. "Biological and Climate Controls on North Atlantic Marine Carbon Dynamics Over the Last Millennium: Insights From an Absolutely Dated Shell‐Based Record From the North Icelandic Shelf." Global Biogeochemical Cycles 31, no. 12 (2017): 1718-1735. doi: 10.1002/2017GB005708. Posted with permission.

Copyright Owner

American Geophysical Union

Language

en

File Format

application/pdf

Published Version

Share

COinS