De Pol-Holz, Ricardo; Ulloa, Osvaldo; Lamy, Frank; Dezileau, Laurent; Sabatier, Pierre; Hebbeln, Dierk (2007): (Table 2) Age determination of sediment core GeoB7139-2. doi:10.1594/PANGAEA.833129, Supplement to: De Pol-Holz, R et al. (2007): Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean. Paleoceanography, 22(2), PA2207, doi:10.1029/2006PA001308
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We present high-resolution bulk sedimentary d15N 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 d15N 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.
Martinson, Douglas G; Pisias, Nicklas G; Hays, James D; Imbrie, John D; Moore, Theodore C; Shackleton, Nicholas J (1987): Age Dating and the orbital theory of the ice ages: development of a high-resolution 0 to 300,000-year chronostratigraphy. Quaternary Research, 27, 1-29, doi:10.1016/0033-5894(87)90046-9
Latitude: -30.200000 * Longitude: -71.983500
Date/Time Start: 2001-04-14T22:13:00 * Date/Time End: 2001-04-14T22:13:00
Minimum DEPTH, sediment/rock: 0.0130 m * Maximum DEPTH, sediment/rock: 0.7530 m
|#||Name||Short Name||Unit||Principal Investigator||Method||Comment|
|2||Age, dated||Age dated||ka||De Pol-Holz, Ricardo||Age, 14C AMS|
|3||Age, dated standard deviation||Age std dev||±||De Pol-Holz, Ricardo||Age, 14C AMS|
|4||Calendar years||Cal yrs||ka BP||De Pol-Holz, Ricardo||Age, 14C calibrated||MIS after Martinson et al. (1987)|
|5||Age, comment||Comm||De Pol-Holz, Ricardo|
38 data points