Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean
De Pol-Holz, Ricardo
MetadataShow full item record
We present high-resolution bulk sedimentary δ 15N data from the southern edge of the present-day oxygen minimum zone of the eastern South Pacific. The record is interpreted as representing changes in water column nitrogen removal during the last 70,000 years. We found significant fluctuations in the isotopic signal that suggest major reorganizations of the oxygen minimum zone at millennial timescales. These fluctuations were not related to other millennial-scale changes like the Northern Hemisphere's Dansgaard-Oeschger climate swings or local changes in primary productivity, so appear to be dictated by the Southern Hemisphere's climate rhythm. This is preliminarily corroborated by an overall agreement between our δ 15N data and the sedimentary proxy of ice sheet dynamics in Patagonia, which is in turn correlated with surface water properties at the midlatitude subduction region of the eastern South Pacific intermediate waters. Finally, potential implications on late Quaternary changes in atmospheric CO2 concentrations are discussed.
Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 22 (2007): PA2207, doi:10.1029/2006PA001308.
Suggested CitationArticle: De Pol-Holz, Ricardo, Ulloa, Osvaldo, Lamy, Frank, Dezileau, Laurent, Sabatier, Pierre, Hebbeln, Dierk, "Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean", Paleoceanography 22 (2007): PA2207, DOI:10.1029/2006PA001308, https://hdl.handle.net/1912/3446
Showing items related by title, author, creator and subject.
Organic complexation of iron in the eastern tropical South Pacific : results from US GEOTRACES Eastern Pacific Zonal Transect (GEOTRACES cruise GP16) Buck, Kristen N.; Sedwick, Peter N.; Sohst, Bettina; Carlson, Craig A. (Elsevier B.V., 2017-11-21)
Czeschel, Rena; Stramma, Lothar; Weller, Robert A.; Fischer, Tim (Copernicus Publications on behalf of the European Geosciences Union, 2015-06-22)A large subsurface oxygen deficiency zone is located in the eastern tropical South Pacific Ocean (ETSP). The large-scale circulation in the eastern equatorial Pacific and off the coast of Peru in November/December 2012 ...
Hawco, Nicholas J.; Ohnemus, Daniel C.; Resing, Joseph A.; Twining, Benjamin S.; Saito, Mak A. (Copernicus Publications on behalf of the European Geosciences Union, 2016-10-17)Cobalt is a nutrient to phytoplankton, but knowledge about its biogeochemical cycling is limited, especially in the Pacific Ocean. Here, we report sections of dissolved cobalt and labile dissolved cobalt from the US GEOTRACES ...