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The Journal of Foraminiferal Research; July 2002; v. 32; no. 3; p. 319-327; DOI: 10.2113/32.3.319
© 2002 Cushman Foundation for Foraminiferal Research
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Article

A FORAMINIFERAL ISOTOPIC PROXY FOR UPPER WATER MASS STRATIFICATION

Dorothy K. Pak1 and James P. Kennett

Marine Science Institute and Department of Geological Sciences, University of California, Santa Barbara, Santa Barbara, CA 93106

1 Corresponding author. pak{at}geol.ucsb.edu

Modern oceanographic investigations show that surface ocean warming is associated with increased thickness of the mixed layer, deepening of the thermocline, and reduction of upwelling strength. These changes can profoundly affect surface ocean biological productivity. Proxies to measure past changes in upper water mass structure and stability are often poorly constrained. Stable oxygen isotope studies of planktonic foraminifera collected in sediment traps in Santa Barbara Basin, Southern California, demonstrate that the {delta}18O difference ({Delta}{delta}18O) between G. bulloides and N. pachyderma (d.) closely monitors changes in the depth of the thermocline and related thickness and stability of the mixed layer. This proxy can be employed in investigations of past changes in sea surface temperature, upwelling and thermocline strength on the California margin, an area of great sensitivity to global change.




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K. G. Cannariato and J. P. Kennett
Structure of the penultimate deglaciation along the California margin and implications for Milankovitch theory
Geology, February 1, 2005; 33(2): 157 - 160.
[Abstract] [Full Text] [PDF]


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