Citation:

PANGAEA.925205

Name: Bulk and diatom-bound nitrogen isotope ratios, opal, TOC, and TN from ODP Hole 178-1098B
Published: 2020-11-30
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Carbon; CDW; circumpolar deep water; Diatom; diatoms; mid-holocene; nitrogen; nitrogen isotope ratios; nitrogen isotopes; Paleoceanography; sediment; Southern Ocean; Stratification; Upwelling; WAP; West Antarctic Peninsula

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Abstract:

Intense seasonal productivity and carbon drawdown on the West Antarctic Peninsula (WAP) is driven by upwelling of nutrient-rich Circumpolar Deep Water (CDW) and subsequent stratification. CDW influence on the WAP is thought to have varied dramatically during the mid-Holocene, 5-7 ka. Here, we use diatom-bound nitrogen isotopes (δ15NDB), a nutrient utilization proxy, from ODP Site 1098 in Palmer Deep to study variations in the presence of CDW on sub-millennial timescales in the mid-Holocene. CDW intrusion is synchronous with atmospheric warming over Antarctica, suggesting that stronger and/or more southerly Southern Hemisphere westerlies enhanced CDW intrusion onto the WAP shelf. Our results also suggest that bulk sedimentary nitrogen isotopes (δ15Nbulk) do not track the same processes as δ15NDB at this site and that this cannot be explained by changes in diatom assemblages.

Keyword(s):

Carbon; CDW; circumpolar deep water; Diatom; diatoms; mid-holocene; nitrogen; nitrogen isotope ratios; nitrogen isotopes; Paleoceanography; sediment; Southern Ocean; Stratification; Upwelling; WAP; West Antarctic Peninsula

Supplement to:

Jones, Colin; Kelly, Roger P; Robinson, Rebecca S (submitted): Nitrogen isotopic constraints on mid-Holocene Circumpolar Deep Water intrusion on the West Antarctic Peninsula. Geophysical Research Letters

Coverage:

Latitude: -64.861930 * Longitude: -64.208000

Date/Time Start: 1998-03-13T00:00:00 * Date/Time End: 1998-03-13T00:00:00

Minimum Elevation: -1010.6 m * Maximum Elevation: -1010.6 m

Event(s):

178-1098B * Latitude: -64.861930 * Longitude: -64.208000 * Date/Time: 1998-03-13T00:00:00 * Elevation: -1010.6 m * Penetration: 43 m * Recovery: 44.66 m * Location: Drake Passage * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 5 cores; 43 m cored; 0 m drilled; 103.9 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Jones, Colin	DSDP/ODP/IODP sample designation
2	Depth, composite	Depth comp	mcd	Jones, Colin
3	AGE	Age	ka BP	Jones, Colin	Age model, Domack et al. (2001)	Geocode
4	Opal, biogenic silica	bSiO2	%	Jones, Colin
5	Opal, biogenic silica, standard deviation	bSiO2 std dev	±	Jones, Colin
6	Carbon, organic, total	TOC	%	Jones, Colin	Element analyser CHNSO, Costech ECS 4010
7	Carbon, organic, total, standard deviation	TOC std dev	±	Jones, Colin	Element analyser CHNSO, Costech ECS 4010
8	Nitrogen, total	TN	%	Jones, Colin	Element analyser CHNSO, Costech ECS 4010
9	Nitrogen, total, standard deviation	TN std dev	±	Jones, Colin	Element analyser CHNSO, Costech ECS 4010
10	δ15N, bulk sediment	δ15N bulk	‰ air	Jones, Colin	Mass spectrometer Delta V
11	δ15N, bulk sediment, standard deviation	δ15N bulk std dev	±	Jones, Colin	Mass spectrometer Delta V
12	δ15N, diatom-bound organic matter	δ15N DB	‰ air	Jones, Colin	Mass spectrometer Delta V
13	δ15N, diatom-bound organic matter, standard deviation	δ15N DB std dev	±	Jones, Colin	Mass spectrometer Delta V

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

364 data points

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