dc.contributor.author | Shadwick, E. H. | en_US |
dc.contributor.author | Thomas, H. | en_US |
dc.contributor.author | Comeau, A. | en_US |
dc.contributor.author | Craig, SE | en_US |
dc.contributor.author | Hunt, C. W. | en_US |
dc.contributor.author | Salisbury, JE | en_US |
dc.date.accessioned | 2013-06-19T18:05:48Z | |
dc.date.available | 2013-06-19T18:05:48Z | |
dc.date.issued | 2010-07 | en_US |
dc.identifier.citation | Shadwick, E. H., H. Thomas, A. Comeau, SE Craig, et al. 2010. "Satellite observations reveal high variability and a decreasing trend in CO sub(2) fluxes on the Scotian Shelf." Biogeosciences Discussions 7(4): 5269-5304. | en_US |
dc.identifier.issn | 1810-6277 | en_US |
dc.identifier.uri | http://hdl.handle.net/10222/27446 | |
dc.description.abstract | We develop an algorithm to compute pCO sub(2) in the Scotian Shelf region (NW Atlantic) from satellite-based estimates of chlorophyll-a concentration, sea-surface temperature, and observed wind speed. This algorithm is based on a high-resolution time-series of pCO sub(2) observations from an autonomous mooring. At the mooring location (44.3 degree N and 63.3 degree W), the surface waters act as a source of CO sub(2) to the atmosphere over the annual scale, with an outgassing of -1.1 mol C m super(-2) yr super(-1) in 2007/2008. A hindcast of air-sea CO sub(2) fluxes from 1999 to 2008 reveals significant variability both spatially and from year to year. Over the decade, the shelf-wide annual air-sea fluxes range from an outgassing of -1.7 mol C m super(-2) yr super(-1) in 2002, to -0.02 mol C m super(-2) yr super(-1) in 2006. There is a gradient in the air-sea CO sub(2) flux between the northeastern Cabot Strait region which acts as a net sink of CO sub(2) with an annual uptake of 0.5 to 1.0 mol C m super(-2) yr super(-1), and the southwestern Gulf of Maine region which acts as a source ranging from -0.8 to -2.5 mol C m super(-2) yr super(-1). There is a decline, or a negative trend, in the air-sea pCO sub(2) gradient of 23 mu atm over the decade, which can be explained by a cooling of 1.3 degree C over the same period. Regional conditions govern spatial, seasonal, and interannual variability on the Scotian Shelf, while multi-annual trends appear linked to the North Atlantic Oscillation. | en_US |
dc.language.iso | en | en_US |
dc.publisher | European Geosciences Union | en_US |
dc.relation.ispartof | Biogeosciences Discussions | en_US |
dc.subject | Ecology Abstracts | en_US |
dc.title | Satellite observations reveal high variability and a decreasing trend in CO sub(2) fluxes on the Scotian Shelf | en_US |
dc.type | article | en_US |
dc.identifier.volume | 7 | en_US |
dc.identifier.issue | 4 | en_US |
dc.identifier.startpage | 5269 | en_US |