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Brunelle, Brigitte G; Sigman, Daniel M; Cook, Mea S; Keigwin, Lloyd D; Haug, Gerald H; Plessen, Birgit; Schettler, Georg; Jaccard, Samuel L (2014): (Table S1) N15 isotope ratios, age determination and accumulation rates of sediment core HLY02-02-17. PANGAEA,, Supplement to: Brunelle, BG et al. (2007): Evidence from diatom-bound nitrogen isotopes for subarctic Pacific stratification during the last ice age and a link to North Pacific denitrification changes. Paleoceanography, 22(1), PA1215,

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In a piston core from the central Bering Sea, diatom microfossil-bound N isotopes and the concentrations of opal, biogenic barium, calcium carbonate, and organic N are measured over the last glacial/interglacial cycle. Compared to the interglacial sections of the core, the sediments of the last ice age are characterized by 3 per mil higher diatom-bound d15N, 70 wt % lower opal content and 1200 ppm lower biogenic barium. Taken together and with constraints on sediment accumulation rate, these results suggest a reduced supply of nitrate to the surface due to stronger stratification of the upper water column of the Bering Sea during glacial times, with more complete nitrate consumption resulting from continued iron supply through atmospheric deposition. This finding extends the body of evidence for a pervasive link between cold climates and polar ocean stratification. In addition, we hypothesize that more complete nutrient consumption in the glacial age subarctic Pacific contributed to the previously observed ice age reduction in suboxia and denitrification in the eastern tropical North Pacific by lowering the nutrient content of the intermediate-depth water formed in the subpolar North Pacific. In the deglacial interval of the Bering Sea record, two apparent peaks in export productivity are associated with maxima in diatom-bound and bulk sediment d15N. The high d15N in these intervals may have resulted from greater surface nutrient consumption during this period. However, the synchroneity of the deglacial peaks in the Bering Sea with similar bulk sediment d15N changes in the eastern Pacific margin and the presence of sediment lamination within the Bering Sea during the deposition of the productivity peaks raise the possibility that both regional and local denitrification worked to raise the d15N of the nitrate feeding Bering Sea surface waters at these times.
Latitude: 53.933000 * Longitude: -178.698800
Date/Time Start: 2002-06-23T00:00:00 * Date/Time End: 2002-06-23T00:00:00
Minimum DEPTH, sediment/rock: 0.085 m * Maximum DEPTH, sediment/rock: 15.360 m
HLY02-02-17 * Latitude: 53.933000 * Longitude: -178.698800 * Date/Time: 2002-06-23T00:00:00 * Elevation: -2209.0 m * Recovery: 15.58 m * Location: North Pacific * Campaign: HLY0202 (HEA02) * Basis: Healy * Method/Device: Jumbo Piston Core (JPC)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmGeocode
2AGEAgeka BPGeocode
3δ15N, bulk sedimentδ15N bulk‰ airBrunelle, Brigitte G
4δ15Nδ15N‰ airBrunelle, Brigitte Gdiatom-bound vs. air
5Opal, biogenic silicabSiO2%Brunelle, Brigitte G
6BariumBamg/kgBrunelle, Brigitte G
7AluminiumAlmg/kgBrunelle, Brigitte G
8Barium, biogenicBa biomg/kgBrunelle, Brigitte G
9Nitrogen, totalTN%Brunelle, Brigitte G
10Calcium carbonateCaCO3%Brunelle, Brigitte G
11Neogloboquadrina pachyderma sinistral, δ18ON. pachyderma s δ18O‰ PDBBrunelle, Brigitte G
12Uvigerina sp., δ18OUvigerina sp. δ18O‰ PDBBrunelle, Brigitte G
13Age, datedAge datedkaBrunelle, Brigitte GAge, 14C AMS
14Age, dated standard deviationAge dated std dev±Brunelle, Brigitte GAge, 14C AMS
15Calendar age, maximum/oldCal age maxka BPBrunelle, Brigitte GAge, 14C calibratedprobability maximum
16Calendar age, minimum/youngCal age minka BPBrunelle, Brigitte GAge, 14C calibrated
17Calendar age, maximum/oldCal age maxka BPBrunelle, Brigitte GAge, 14C calibrated
18Accumulation rate, sediment, meanMARg/cm2/kaBrunelle, Brigitte GNormalizedTh-normalized
19Accumulation rate, bariumAcc rate Bamg/cm2/kaBrunelle, Brigitte GNormalizedTh-normalized
20Accumulation rate, calciumAcc rate Cag/cm2/kaBrunelle, Brigitte GNormalizedTh-normalized
21Accumulation rate, opalAcc rate opalg/cm2/kaBrunelle, Brigitte GNormalizedTh-normalized
22Accumulation rate, sediment, meanMARg/cm2/kaBrunelle, Brigitte GC14-derived
23Accumulation rate, bariumAcc rate Bamg/cm2/kaBrunelle, Brigitte GC14-derived
24Accumulation rate, calciumAcc rate Cag/cm2/kaBrunelle, Brigitte GC14-derived
25Accumulation rate, opalAcc rate opalg/cm2/kaBrunelle, Brigitte GC14-derived
1891 data points

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