Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Tracing terrestrial organic matter by delta(34)S and delta(13)C signatures in a subarctic estuary
Show others and affiliations
Responsible organisation
2008 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 53, no 6, 2594-2602 p.Article in journal (Refereed) Published
Abstract [en]

A key issue to understanding the transformations of terrestrial organic carbon in the ocean is to disentangle the latter from marine-produced organic matter. We applied a multiple stable isotope approach using delta(34)S and delta(13)C isotope signatures from estuarine dissolved organic matter (DOM), enabling us to constrain the contribution of terrestrial-derived DOM in an estuarine gradient of the northern Baltic Sea. The stable isotope signatures for dissolved organic sulfur (delta(34)S(DOS)) have twice the range between terrestrial and marine end members compared to the stable isotope signatures for dissolved organic carbon (delta(13)C(DOC)); hence, the share of terrestrial DOM in the total estuarine DOM can be calculated more precisely. DOM samples from the water column were collected using ultrafiltration on board the German RV Maria S Merian during a winter cruise, in the Bothnian Bay, Bothnian Sea, and Baltic proper. We calculated the terrestrial fraction of the estuarine DOC (DOC(ter)) from both delta(13)C(DOC) and delta(34)S(DOS) signatures and applying fixed C: S ratios for riverine and marine end members to convert S isotope signatures into DOC concentrations. The delta(34)S(DOS) signature of the riverine end member was +7.02 parts per thousand, and the mean signatures from Bothnian Bay, Bothnian Sea, and Baltic proper were +10.27, +12.51, and +13.67 parts per thousand, respectively, showing an increasing marine signal southwards (d34SDOS marine end member = 18.1 parts per thousand). These signatures indicate that 87%, 75%, and 67%, respectively, of the water column DOC is of terrestrial origin (DOC(ter)) in these basins. Comparing the fractions of DOC(ter) in each basin-that are still based on few winter values only-with the annual river input of DOC, it appears that the turnover time for DOC(ter) in the Gulf of Bothnia is much shorter than the hydraulic turnover time, suggesting that high-latitude estuaries might be efficient sinks for DOC(ter).

Place, publisher, year, edition, pages
2008. Vol. 53, no 6, 2594-2602 p.
National Category
Natural Sciences
Research subject
SWEDARP 2010/11, Oden Southern Ocean 2010/11
Identifiers
URN: urn:nbn:se:polar:diva-3124DOI: 10.4319/lo.2008.53.6.2594OAI: oai:DiVA.org:polar-3124DiVA: diva2:1050213
Available from: 2016-11-28 Created: 2016-11-21 Last updated: 2016-11-28

Open Access in DiVA

No full text

Other links

Publisher's full text
In the same journal
Limnology and Oceanography
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 29 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf