Bulk and diatom-bound nitrogen isotope ratios, opal, TOC, and TN from ODP Hole 178-1098B ...

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 di...

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Bibliographic Details
Main Authors: Jones, Colin, Kelly, Roger P, Robinson, Rebecca S
Format: Dataset
Language:English
Published: PANGAEA 2020
Subjects:
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
Sample code/label
Depth, composite
AGE
Opal, biogenic silica
Opal, biogenic silica, standard deviation
Carbon, organic, total
Carbon, organic, total, standard deviation
Nitrogen, total
Nitrogen, total, standard deviation
δ15N, bulk sediment
δ15N, bulk sediment, standard deviation
δ15N, diatom-bound organic matter
δ15N, diatom-bound organic matter, standard deviation
Drilling/drill rig
DSDP/ODP/IODP sample designation
Age model, Domack et al. 2001
Element analyser CHNSO, Costech ECS 4010
Mass spectrometer Delta V
Leg178
Joides Resolution
Antarctic
Antarctic Peninsula
Palmer Deep
Antarc*
Antarctica
Online Access:https://dx.doi.org/10.1594/pangaea.925205
https://doi.pangaea.de/10.1594/PANGAEA.925205
Description
Summary: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. ...

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