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PALEOCEANOGRAPHY

Nitrogen and Carbon Isotope Data from the Central Arctic Ocean

Map of data site
Schubert, C.J., R. Stein, and S.E. Calvert. 2001. Tracking nutrient and productivity variations over the last deglaciation in the Arctic Ocean. Paleoceanography 16(2):199-211.
Data Coverage North: 88.02 * South: 86.23
West: 59.2 * East: 159.58
Altitude: -4083 m

Start Year: 14C yr BP * End Year: 14C yr BP

Data:     Please Cite Data Contributors!
  schubert2001
  ps2163-1-tab.txt
  ps2170-4-tab.txt
  ps2178-4-tab.txt
  ps2185-4-tab.txt

Summary:

We have reconstructed the surface water environment of the Arctic Ocean over the last ~50,000 years using measurements of the organic nitrogen and carbon isotope ratios, carbonate and total organic carbon concentrations (TOC), and terrestrial biomarkers (lignin and long-chain n-alkanes) in four multicores. Variations in nitrogen isotope ratios that are concordant with TOC and carbonate concentrations (representing foraminifera and excluding ice-rafted-debris) reflect differences in relative nutrient utilization of phytoplankton in the surface waters. However, ¿15N variations also appear to be dependent on the stratification of the water column and therefore potentially track the exchange of nutrients between deep and surface waters. Low Last Glacial Maximum (LGM) ¿15N values and higher Holocene values are opposite to those recorded in the Southern Ocean. The Arctic Ocean with higher nutrient utilization today compared to the LGM therefore acts as a counterpart to the Southern Ocean, although the global impact on carbon dioxide variations compared to the Southern Ocean is probably low.
More Info on Paleoceanography Data

Parameters:

delta C13 PDB; Calcium Carbonate percent; Organic Carbon weight percent; delta N15

Complete XML Record:

noaa-ocean-2593  (Last Revised: 2008-04-10 )

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