Eddy transport of organic carbon and nutrients from the Chukchi Shelf: Impact on the upper halocline of the western Arctic Ocean

Jeremy T. Mathis, Robert S. Pickart, Dennis A Hansell, David Kadko, Nicholas R. Bates

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

In September 2004 a detailed physical and chemical survey was conducted on an anticyclonic, cold-core eddy located seaward of the Chukchi Shelf in the western Arctic Ocean. The eddy had a diameter of ∼16 km and was centered at a depth of ∼160 m between the 1000 and 1500 in isobaths over the continental slope. The water in the core of the eddy (total volume of 25 km3) was of Pacific origin, and contained elevated concentrations of nutrients, organic carbon, and suspended particles. The feature, which likely formed from the boundary current along the edge of the Chukchi Shelf, provides a mechanism for transport of carbon, oxygen, and nutrients directly into the upper halocline of the Canada Basin. Nutrient concentrations in the eddy core were elevated compared to waters of similar density in the deep Canada Basin: silicate (+20 μmol L-1), nitrate (+5 μmol L-1), and phosphate (+0.4 μmol L-1). Organic carbon in the eddy core was also elevated: POC (+3.8 μmol L-1) and DOC (+11 μmol L-1). From these observations, the eddy contained 1.25 × 109 moles Si, 4.5 × 108 moles NO3 - 5.5 × 107 moles PO3 - 1.2 × 109 moles POC, and 1.9 × 109 moles DOC, all available for transport to the interior of the Canada Basin. This suggests that such eddies likely play a significant role in maintaining the nutrient maxima observed in the upper haloclihe. Assuming that shelf-to-basin eddy transport is the dominant renewal mechanism for waters of the upper halocline, remineralization of the excess organic carbon transported into the interior would consume 6.70 × 1010 moles of O2, or one half the total oxygen consumption anticipated arising from all export processes impacting the upper halocline.

Original languageEnglish (US)
Article numberC05011
JournalJournal of Geophysical Research C: Oceans
Volume112
Issue number5
DOIs
StatePublished - May 8 2007

Fingerprint

Arctic Ocean
halocline
nutrients
Organic carbon
shelves
Nutrients
eddy
organic carbon
vortices
nutrient
carbon
Water
Canada
Oxygen
Silicates
basin
Nitrates
Carbon
Phosphates
water

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

Eddy transport of organic carbon and nutrients from the Chukchi Shelf : Impact on the upper halocline of the western Arctic Ocean. / Mathis, Jeremy T.; Pickart, Robert S.; Hansell, Dennis A; Kadko, David; Bates, Nicholas R.

In: Journal of Geophysical Research C: Oceans, Vol. 112, No. 5, C05011, 08.05.2007.

Research output: Contribution to journalArticle

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abstract = "In September 2004 a detailed physical and chemical survey was conducted on an anticyclonic, cold-core eddy located seaward of the Chukchi Shelf in the western Arctic Ocean. The eddy had a diameter of ∼16 km and was centered at a depth of ∼160 m between the 1000 and 1500 in isobaths over the continental slope. The water in the core of the eddy (total volume of 25 km3) was of Pacific origin, and contained elevated concentrations of nutrients, organic carbon, and suspended particles. The feature, which likely formed from the boundary current along the edge of the Chukchi Shelf, provides a mechanism for transport of carbon, oxygen, and nutrients directly into the upper halocline of the Canada Basin. Nutrient concentrations in the eddy core were elevated compared to waters of similar density in the deep Canada Basin: silicate (+20 μmol L-1), nitrate (+5 μmol L-1), and phosphate (+0.4 μmol L-1). Organic carbon in the eddy core was also elevated: POC (+3.8 μmol L-1) and DOC (+11 μmol L-1). From these observations, the eddy contained 1.25 × 109 moles Si, 4.5 × 108 moles NO3 - 5.5 × 107 moles PO3 - 1.2 × 109 moles POC, and 1.9 × 109 moles DOC, all available for transport to the interior of the Canada Basin. This suggests that such eddies likely play a significant role in maintaining the nutrient maxima observed in the upper haloclihe. Assuming that shelf-to-basin eddy transport is the dominant renewal mechanism for waters of the upper halocline, remineralization of the excess organic carbon transported into the interior would consume 6.70 × 1010 moles of O2, or one half the total oxygen consumption anticipated arising from all export processes impacting the upper halocline.",
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AB - In September 2004 a detailed physical and chemical survey was conducted on an anticyclonic, cold-core eddy located seaward of the Chukchi Shelf in the western Arctic Ocean. The eddy had a diameter of ∼16 km and was centered at a depth of ∼160 m between the 1000 and 1500 in isobaths over the continental slope. The water in the core of the eddy (total volume of 25 km3) was of Pacific origin, and contained elevated concentrations of nutrients, organic carbon, and suspended particles. The feature, which likely formed from the boundary current along the edge of the Chukchi Shelf, provides a mechanism for transport of carbon, oxygen, and nutrients directly into the upper halocline of the Canada Basin. Nutrient concentrations in the eddy core were elevated compared to waters of similar density in the deep Canada Basin: silicate (+20 μmol L-1), nitrate (+5 μmol L-1), and phosphate (+0.4 μmol L-1). Organic carbon in the eddy core was also elevated: POC (+3.8 μmol L-1) and DOC (+11 μmol L-1). From these observations, the eddy contained 1.25 × 109 moles Si, 4.5 × 108 moles NO3 - 5.5 × 107 moles PO3 - 1.2 × 109 moles POC, and 1.9 × 109 moles DOC, all available for transport to the interior of the Canada Basin. This suggests that such eddies likely play a significant role in maintaining the nutrient maxima observed in the upper haloclihe. Assuming that shelf-to-basin eddy transport is the dominant renewal mechanism for waters of the upper halocline, remineralization of the excess organic carbon transported into the interior would consume 6.70 × 1010 moles of O2, or one half the total oxygen consumption anticipated arising from all export processes impacting the upper halocline.

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