Barium in Twilight Zone suspended matter as a potential proxy for particulate organic carbon remineralization: Results for the North Pacific Metadata

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Title

  • Main Title Barium in Twilight Zone suspended matter as a potential proxy for particulate organic carbon remineralization: Results for the North Pacific

Creator

  • Author: Dehairs, F.
    Creator Type: Personal
  • Author: Jacquet, S.
    Creator Type: Personal
  • Author: Savoye, N.
    Creator Type: Personal
  • Author: Van Mooy, B. A. S.
    Creator Type: Personal
  • Author: Buesseler, K.
    Creator Type: Personal
  • Author: Bishop, J. K. B.
    Creator Type: Personal
  • Author: Lamborg, C. H.
    Creator Type: Personal
  • Author: Elskens, M.
    Creator Type: Personal
  • Author: Baeyens, W.
    Creator Type: Personal
  • Author: Boyd, P. W.
    Creator Type: Personal
  • Author: Casciotti, K. L.
    Creator Type: Personal
  • Author: Monnin, C.
    Creator Type: Personal

Contributor

  • Sponsor: Lawrence Berkeley National Laboratory. Earth Sciences Division.
    Contributor Type: Organization

Publisher

  • Name: Lawrence Berkeley National Laboratory
    Place of Publication: Berkeley, California
    Additional Info: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States)

Date

  • Creation: 2008-04-10

Language

  • English

Description

  • Content Description: This study focuses on the fate of exported organic carbon in the twilight zone at two contrasting environments in the North Pacific: the oligotrophic ALOHA site (22 degrees 45 minutes N 158 degrees W; Hawaii; studied during June-July 2004) and the mesotrophic Subarctic Pacific K2 site (47 degrees N, 161 degrees W; studied during July-August 2005). Earlier work has shown that non-lithogenic, excess particulate Ba (Ba{sub xs}) in the mesopelagic water column is a potential proxy of organic carbon remineralization. In general Ba{sub xs} contents were significantly larger at K2 than at ALOHA. At ALOHA the Ba{sub xs} profiles from repeated sampling (5 casts) showed remarkable consistency over a period of three weeks, suggesting that the system was close to being at steady state. In contrast, more variability was observed at K2 (6 casts sampled) reflecting the more dynamic physical and biological conditions prevailing in this environment. While for both sites Ba{sub xs} concentrations increased with depth, at K2 a clear maximum was present between the base of the mixed layer at around 50m and 500m, reflecting production and release of Ba{sub xs}. Larger mesopelagic Ba{sub xs} contents and larger bacterial production in the twilight zone at the K2 site indicate that more material was exported from the upper mixed layer for bacterial degradation deeper, compared to the ALOHA site. Furthermore, application of a published transfer function (Dehairs et al., 1997) relating oxygen consumption to the observed Ba{sub xs} data indicated that the latter were in good agreement with bacterial respiration, calculated from bacterial production. These results corroborate earlier findings highlighting the potential of Ba{sub xs} as a proxy for organic carbon remineralization. The range of POC remineralization rates calculated from twilight zone excess particulate Ba contents did also compare well with the depth dependent POC flux decrease as recorded by neutrally buoyant sediment traps, except in 1 case (out of 4). This discrepancy could indicate that differences in sinking velocities cause an

Subject

  • Keyword: Particulates
  • STI Subject Categories: 58
  • Keyword: Sediments
  • Keyword: Oxygen
  • STI Subject Categories: 54
  • Keyword: Respiration
  • Keyword: Sampling
  • Keyword: Production
  • Keyword: Water
  • Keyword: Barium
  • Keyword: Carbon
  • Keyword: Transfer Functions

Source

  • Journal Name: Deep Sea Research II; Journal Volume: 55; Journal Issue: doi:10.1016/j.dsr2.2008.04.020; Related Information: Journal Publication Date: 2008

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: LBNL-949E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 937578
  • Archival Resource Key: ark:/67531/metadc899167
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