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Titel Seasonal variability of dissolved inorganic carbon and surface water pCO2 in the Scotian Shelf region of the Northwestern Atlantic
VerfasserIn E. H. Shadwick, H. Thomas, B. J. W. Greenan
Konferenz EGU General Assembly 2009
Medientyp Artikel
Sprache Englisch
Digitales Dokument PDF
Erschienen In: GRA - Volume 11 (2009)
Datensatznummer 250028363
 
Zusammenfassung
The seasonal variability of inorganic carbon in the surface waters of the Scotian Shelf region of the Canadian northwestern Atlantic Ocean is investigated. Seasonal variability is assessed using hourly measurements covering a full annual cycle of the partial pressure of CO2, (pCO2), and hydrographic variables obtained by an autonomous moored instrument. These measurements are complimented by frequent shipboard sampling of dissolved inorganic carbon (DIC), total alkalinity (TA), and pCO2, at the mooring site, and over the larger spatial scale. Biological processes, temperature, and advection are found to be the main factors controlling inorganic carbon in the surface waters and mixed layer. The air-sea fluxes of CO2 are estimated; the region acts as a net source of CO2 to the atmosphere on the annual scale, with a reversal of this process occurring only during the spring bloom, when a rapid undersaturation of the surface waters is reached for a short period. Annual mixed layer net community production in is also assessed.