Seasonal and interannual changes in particulate organic carbon export and deposition in the Chukchi Sea

Kate Lepore, S. B. Moran, J. M. Grebmeier, L. W. Cooper, C. Lalande, W. Maslowski, V. Hill, N. R. Bates, Dennis A Hansell, J. T. Mathis, R. P. Kelly

Research output: Contribution to journalArticle

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Abstract

Particulate organic carbon (POC) export fluxes were estimated in the shelf-slope region of the Chukchi Sea using measurements of 234Th-238 U disequilibria and the POC/234 Th ratio in large (>53-μm) particles. These export fluxes were used in conjunction with rates of primary productivity and benthic carbon respiration to construct a POC budget for this shelf-slope region. Samples were collected along a series of shelf-basin transects in the spring (May-June) and summer (July-August) of 2004. These stations were previously occupied during the ice covered (spring) and open water (summer) seasons of 2002, allowing for an interannual comparison of export flux. In contrast to 2002, when open water POC fluxes were significantly higher than in the ice-covered period, POC export fluxes in 2004 were similar during the spring (average = 19.7 ± 24.8 mmol C m-2 d-1) and summer (average = 20.0 ± 14.5 mmol C m-2 d-1). The high POC fluxes measured during the spring are attributed to a plankton bloom, as evidenced by exceptionally high rates of primary productivity (average = 124.4 ± 88.1 mmol C m-2 d-1). The shelf-slope budget of particulate organic carbon indicates that 10-20% of primary productivity was exported below 50 m but was not consumed during benthic carbon respiration or burial and oxidation in underlying sediments. Furthermore, a water column-sediment budget of 234Th indicates that particulate material is retained in shelf sediments on a seasonal basis.

Original languageEnglish (US)
Article numberC10024
JournalJournal of Geophysical Research C: Oceans
Volume112
Issue number10
DOIs
StatePublished - Oct 8 2007

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Chukchi Sea
particulate organic carbon
Organic carbon
particulates
Fluxes
carbon
shelves
Sediments
productivity
Productivity
budgets
Ice
summer
carbon flux
open water
sediments
Water
respiration
slopes
Carbon

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

Lepore, K., Moran, S. B., Grebmeier, J. M., Cooper, L. W., Lalande, C., Maslowski, W., ... Kelly, R. P. (2007). Seasonal and interannual changes in particulate organic carbon export and deposition in the Chukchi Sea. Journal of Geophysical Research C: Oceans, 112(10), [C10024]. https://doi.org/10.1029/2006JC003555

Seasonal and interannual changes in particulate organic carbon export and deposition in the Chukchi Sea. / Lepore, Kate; Moran, S. B.; Grebmeier, J. M.; Cooper, L. W.; Lalande, C.; Maslowski, W.; Hill, V.; Bates, N. R.; Hansell, Dennis A; Mathis, J. T.; Kelly, R. P.

In: Journal of Geophysical Research C: Oceans, Vol. 112, No. 10, C10024, 08.10.2007.

Research output: Contribution to journalArticle

Lepore, K, Moran, SB, Grebmeier, JM, Cooper, LW, Lalande, C, Maslowski, W, Hill, V, Bates, NR, Hansell, DA, Mathis, JT & Kelly, RP 2007, 'Seasonal and interannual changes in particulate organic carbon export and deposition in the Chukchi Sea', Journal of Geophysical Research C: Oceans, vol. 112, no. 10, C10024. https://doi.org/10.1029/2006JC003555
Lepore, Kate ; Moran, S. B. ; Grebmeier, J. M. ; Cooper, L. W. ; Lalande, C. ; Maslowski, W. ; Hill, V. ; Bates, N. R. ; Hansell, Dennis A ; Mathis, J. T. ; Kelly, R. P. / Seasonal and interannual changes in particulate organic carbon export and deposition in the Chukchi Sea. In: Journal of Geophysical Research C: Oceans. 2007 ; Vol. 112, No. 10.
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