Seasonal variability of dissolved inorganic carbon and surface water pCO2 in the Scotian Shelf region of the Northwestern Atlantic

Shadwick, E. H.; Thomas, Helmuth; Azetsu-Scott, Kumiko; Greenan, B. J. W.; Head, Ejh; Horne, Edward P. W.

doi:10.1016/j.marchem.2010.11.004

Cited by 69 publications

(105 citation statements)

References 80 publications

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“…3. The combined general model showed a marked decrease in error over 20 and comparable errors over BM2-BM4. Regionally, most NRS exhibited similar errors over the four base models, with the exceptions being Darwin and Ningaloo.…”

Section: % Confidence Errors (Ce)mentioning

confidence: 83%

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Estimating total alkalinity for coastal ocean acidification monitoring at regional to continental scales in Australian coastal waters

Baldry

Hardman-Mountford

Greenwood

2017

Preprint

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Abstract.Owing to a lack of resources, tools, and knowledge, the natural variability and distribution of Total Alkalinity (TA) has been poorly characterised in coastal waters globally, yet variability is known to be high in coastal regions due to the complex interactions of oceanographic, biotic, and terrestrially-influenced processes. This is a 5 particularly challenging task for the vast Australian coastline, however, it is also this vastness that demands attention in the face of ocean acidification (OA). Australian coastal waters have high biodiversity and endemism, and are home to large areas of coral reef, including the Great Barrier Reef, the largest coral reef system in the world. Ocean acidification threatens calcifying marine organisms by hindering calcification rates, Biogeosciences Discuss.,

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Section: % Confidence Errors (Ce)mentioning

confidence: 83%

“…Indeed, the seasonality in the residuals was seen to co-vary with seasonal freshening in salinity data (SF2). All of these processes affect TA signals directly, so a clear signal may be seen in the data (Brewer and Goldman, 1976;Cai et al, 2010;Jiang et al, 2014;Shadwick et al, 2011), but cannot be monitored via remote sensing (or BM3). In fact, when N was 40…”

mentioning

confidence: 99%

Estimating total alkalinity for coastal ocean acidification monitoring at regional to continental scales in Australian coastal waters

Baldry

Hardman-Mountford

Greenwood

2017

Preprint

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“…Observational studies reveal the Scotian Shelf to be a source of CO2 to the atmosphere, except during the period of the spring bloom (Shadwick et al, 2010(Shadwick et al, , 2011, see also Signorini et al, 2013 for discussion). Fluxes of CO2 to the atmosphere are highly variable outside of the spring bloom period (Shadwick et al, 2010).…”

Section: Oceanographic Settingmentioning

confidence: 99%

“…Lawrence River arrives (Loder et al, 1997, Shadwick et al, 2011, Dever et al, 2016. Salinity increases further off the shelf as a result of the warm salty water from the Gulf Stream, which transports water south of the Scotian Shelf towards Western Europe.…”

Section: Oceanographic Settingmentioning

confidence: 99%

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Hurricane Arthur and its effect on the short-term variability of pCO<sub>2</sub> on the Scotian Shelf, NW Atlantic

Lemay¹,

Thomas²,

Craig³

et al. 2017

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The understanding of seasonal variability of carbon cycling on the Scotian Shelf, NW Atlantic Ocean, has improved in recent years, however, very little information is available regarding its short-term variability. In order to shed light on this aspect of carbon cycling on the Scotian Shelf we investigate the effects of Hurricane Arthur, which passed the region on July 5 At the surface, phytoplankton begin to grow more rapidly due to increased light. The combination of growth and mixing of low DIC water led to a short-term reduction in partial pressure of CO2 until wind speeds relaxed and allowed for the restratification of the upper water column. These Hurricane-related processes caused a (net-) CO2 uptake by the Scotian Shelf region that is comparable to the spring bloom, thus exerting a major impact on the annual CO2 flux budget.

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Regionalized global budget of the CO₂ exchange at the air‐water interface in continental shelf seas

Laruelle

Lauerwald

Pfeil

et al. 2014

Global Biogeochemical Cycles

216

260

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Over the past decade, estimates of the atmospheric CO 2 uptake by continental shelf seas were constrained within the 0.18-0.45 Pg C yr À1 range. However, most of those estimates are based on extrapolations from limited data sets of local flux measurements (n < 100). Here we propose to derive the CO 2 air-sea exchange of the shelf seas by extracting 3 · 10 6 direct surface ocean CO 2 measurements from the global database SOCAT (Surface Ocean CO 2 Atlas), atmospheric CO 2 values from GlobalVIEW and calculating gas transfer rates using readily available global temperature, salinity, and wind speed fields. We then aggregate our results using a global segmentation of the shelf in 45 units and 152 subunits to establish a consistent regionalized CO 2 exchange budget at the global scale. Within each unit, the data density determines the spatial and temporal resolutions at which the air-sea CO 2 fluxes are calculated and range from a 0.5°resolution in the best surveyed regions to a whole unit resolution in areas where data coverage is limited. Our approach also accounts, for the first time, for the partial sea ice cover of polar shelves. Our new regionalized global CO 2 sink estimate of 0.19 ± 0.05 Pg C yr À1 falls in the low end of previous estimates. Reported to an ice-free surface area of 22 · 10 6 km 2 , this value yields a flux density of 0.7 mol C m À2 yr À1 ,~40% more intense than that of the open ocean. Our results also highlight the significant contribution of Arctic shelves to this global CO 2 uptake (0.07 Pg C yr À1 ).

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Seasonal variability of dissolved inorganic carbon and surface water pCO2 in the Scotian Shelf region of the Northwestern Atlantic

Cited by 69 publications

References 80 publications

Estimating total alkalinity for coastal ocean acidification monitoring at regional to continental scales in Australian coastal waters

Estimating total alkalinity for coastal ocean acidification monitoring at regional to continental scales in Australian coastal waters

Hurricane Arthur and its effect on the short-term variability of pCO<sub>2</sub> on the Scotian Shelf, NW Atlantic

Regionalized global budget of the CO₂ exchange at the air‐water interface in continental shelf seas

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Seasonal variability of dissolved inorganic carbon and surface water pCO2 in the Scotian Shelf region of the Northwestern Atlantic

Cited by 69 publications

References 80 publications

Estimating total alkalinity for coastal ocean acidification monitoring at regional to continental scales in Australian coastal waters

Estimating total alkalinity for coastal ocean acidification monitoring at regional to continental scales in Australian coastal waters

Hurricane Arthur and its effect on the short-term variability of pCO&lt;sub&gt;2&lt;/sub&gt; on the Scotian Shelf, NW Atlantic

Regionalized global budget of the CO2 exchange at the air‐water interface in continental shelf seas

Contact Info

Product

Resources

About

Hurricane Arthur and its effect on the short-term variability of pCO<sub>2</sub> on the Scotian Shelf, NW Atlantic

Regionalized global budget of the CO₂ exchange at the air‐water interface in continental shelf seas