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| Titel |
Seasonal Variability of the Inorganic Carbon System in the Amundsen Gulf Region of the Southeastern Beaufort Sea |
| VerfasserIn |
Elizabeth H. Shadwick, Helmuth Thomas, Alfonso Mucci, Tim Papakyriakou, Jean-Éric Tremblay |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250031769
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| Zusammenfassung |
| High latitude oceans are ecologically sensitive areas where the early detection of climactic
changes will most likely be possible. Polar oceans are also chemically sensitive due to the
relatively high Revelle factor and correspondingly weaker buffer capacity of these waters.
Dissolved inorganic carbon (DIC), total alkalinity (TA) and partial pressure of CO2
(pCO2) measurements covering a full annual cycle were collected in the Amundsen
Gulf region of the Southeastern Beaufort Sea as part of the Canadian International
Polar Year initiatives, between October 2007 and September 2008. The annual
cycles of inorganic carbon system parameters (DIC, TA, pCO2, pH, and aragonite
saturation (Ωar)) are presented, and seasonal variations examined. The physical and
biological processes responsible for the seasonal variations in water column DIC are
identified. We establish a two-box model for the surface and subsurface layers in
order to compute monthly changes in DIC due to: horizontal and vertical advection
between the boxes, air-sea exchange of CO2, freshwater input from river runoff and
sea-ice melt, and biological processes. The assessment of these governing processes
allows an estimate of net community production and respiration for Amundsen
Gulf to be made on the basis of the inorganic carbon data collected in the region. |
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