The deglacial history of surface and intermediate water of the Bering Sea
Cook, Mea S.
Keigwin, Lloyd D.
Sancetta, Constance A.
MetadataShow full item record
KeywordAnoxic sediments; Deglaciation; Diatoms; Foraminifera; Oxygen isotope stratigraphy; Bering Sea
The lithology of deglacial sediments from the Bering Sea includes intervals of laminated or dysaerobic sediments. These intervals are contemporaneous with the occurrence of laminated sediments from the California margin and Gulf of California, which suggests widespread low-oxygen conditions at intermediate depths in the North Pacific Ocean. The cause could be reduced intermediate water ventilation, increased organic carbon flux, or a combination of the two. We infer abrupt decreases of planktonic foraminifer δ18O at 14,400 y BP and 11,650 y BP, which may be a combination of both freshening and warming. On the Shirshov Ridge, the abundance of sea-ice diatoms of the genus Nitzschia reach local maxima twice during the deglaciation, the latter of which may be an expression of the Younger Dryas. These findings expand the extent of the expression of deglacial millennial-scale climate events to include the northernmost Pacific.
Author Posting. © The Authors, 2005. This is the author's version of the work. It is posted here by permission of Elsevier B. V. for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part II: Topical Studies in Oceanography 52 (2005): 2163-2173, doi:10.1016/j.dsr2.2005.07.004.
Showing items related by title, author, creator and subject.
Deglacial variability in the surface return flow of the Atlantic meridional overturning circulation Came, Rosemarie E.; Oppo, Delia W.; Curry, William B.; Lynch-Stieglitz, Jean (American Geophysical Union, 2008-03-29)Benthic foraminiferal Cd/Ca from a Florida Current sediment core documents the history of the northward penetration of southern source waters within the surface return flow of the Atlantic meridional overturning circulation ...
Calibration and application of B/Ca, Cd/Ca, and δ11B in Neogloboquadrina pachyderma (sinistral) to constrain CO2 uptake in the subpolar North Atlantic during the last deglaciation Yu, Jimin; Thornalley, David J. R.; Rae, James W. B.; McCave, I. Nick (John Wiley & Sons, 2013-05-30)The North Atlantic and Norwegian Sea are prominent sinks of atmospheric CO2 today, but their roles in the past remain poorly constrained. In this study, we attempt to use B/Ca and δ11B ratios in the planktonic foraminifera ...
Carlson, Anders E.; LeGrande, Allegra N.; Oppo, Delia W.; Came, Rosemarie E.; Schmidt, Gavin A.; Anslow, Faron S.; Licciardi, Joseph M.; Obbink, Elizabeth A. (2008-07-24)The early Holocene deglaciation of the Laurentide Ice Sheet (LIS) is the most recent and best constrained disappearance of a large Northern Hemisphere ice sheet. Its demise is a natural experiment for assessing rates of ...