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  • 178-1098B; AGE; Age model, Domack et al. (2001); Carbon; Carbon, organic, total; Carbon, organic, total, standard deviation; CDW; circumpolar deep water; Depth, composite; Diatom; diatoms; Drake Passage; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser CHNSO, Costech ECS 4010; Joides Resolution; Leg178; Mass spectrometer Delta V; mid-holocene; nitrogen; Nitrogen, total; Nitrogen, total, standard deviation; nitrogen isotope ratios; nitrogen isotopes; Opal, biogenic silica; Opal, biogenic silica, standard deviation; Paleoceanography; Sample code/label; sediment; Southern Ocean; Stratification; Upwelling; WAP; West Antarctic Peninsula; δ15N, bulk sediment; δ15N, bulk sediment, standard deviation; δ15N, diatom-bound organic matter; δ15N, diatom-bound organic matter, standard deviation  (1)
  • Air-sea gas exchange  (1)
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  • 1
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    How well does wind speed predict air-sea gas transfer in the sea ice zone? A synthesis of radon deficit profiles in the upper water column of the Arctic Ocean (2017)
    John Wiley & Sons
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2017. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 122 (2017): 3696–3714, doi:10.1002/2016JC012460.
    Description: We present 34 profiles of radon-deficit from the ice-ocean boundary layer of the Beaufort Sea. Including these 34, there are presently 58 published radon-deficit estimates of air-sea gas transfer velocity (k) in the Arctic Ocean; 52 of these estimates were derived from water covered by 10% sea ice or more. The average value of k collected since 2011 is 4.0 ± 1.2 m d−1. This exceeds the quadratic wind speed prediction of weighted kws = 2.85 m d−1 with mean-weighted wind speed of 6.4 m s−1. We show how ice cover changes the mixed-layer radon budget, and yields an “effective gas transfer velocity.” We use these 58 estimates to statistically evaluate the suitability of a wind speed parameterization for k, when the ocean surface is ice covered. Whereas the six profiles taken from the open ocean indicate a statistically good fit to wind speed parameterizations, the same parameterizations could not reproduce k from the sea ice zone. We conclude that techniques for estimating k in the open ocean cannot be similarly applied to determine k in the presence of sea ice. The magnitude of k through gaps in the ice may reach high values as ice cover increases, possibly as a result of focused turbulence dissipation at openings in the free surface. These 58 profiles are presently the most complete set of estimates of k across seasons and variable ice cover; as dissolved tracer budgets they reflect air-sea gas exchange with no impact from air-ice gas exchange.
    Description: NSF Arctic Natural Sciences program Grant Number: 1203558
    Description: 2017-11-05
    Keywords: Radon-deficit ; Air-sea gas exchange ; Sea ice ; Gas transfer velocity ; Air-sea flux ; Carbon
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Location Call Number Expected Availability
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    PAPER (OA)
  • 2
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    Bulk and diatom-bound nitrogen isotope ratios, opal, TOC, and TN from ODP Hole 178-1098B (2020)
    PANGAEA
    Details
    Publication Date: 2024-04-25
    Description: 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.
    Keywords: 178-1098B; AGE; Age model, Domack et al. (2001); Carbon; Carbon, organic, total; Carbon, organic, total, standard deviation; CDW; circumpolar deep water; Depth, composite; Diatom; diatoms; Drake Passage; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser CHNSO, Costech ECS 4010; Joides Resolution; Leg178; Mass spectrometer Delta V; mid-holocene; nitrogen; Nitrogen, total; Nitrogen, total, standard deviation; nitrogen isotope ratios; nitrogen isotopes; Opal, biogenic silica; Opal, biogenic silica, standard deviation; Paleoceanography; Sample code/label; sediment; Southern Ocean; Stratification; Upwelling; WAP; West Antarctic Peninsula; δ15N, bulk sediment; δ15N, bulk sediment, standard deviation; δ15N, diatom-bound organic matter; δ15N, diatom-bound organic matter, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 364 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
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