Episodic riverine influence on surface DIC in the coastal Gulf of Maine

Salisbury, Joseph E.; Vandemark, D.; Hunt, Christopher W; Campbell, J. W.; Jönsson, Bror; Mahadevan, Amala; McGillis, Wade R.; Xue, Huijie

doi:10.1016/j.ecss.2008.12.021

Cited by 61 publications

(62 citation statements)

References 51 publications

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“…However, our observations are in agreement with those of similar process studies in the neighboring Gulf of Maine (Salisbury et al, 2009;Shadwick et al, 2011a;Vandemark et al, 2010). Previdi et al (2009) have suggested that interannual variability in air-sea CO 2 flux on the eastern North American continental shelf is due in part to NAO forcing.…”

Section: Shelf-wide Co 2 Fluxessupporting

confidence: 82%

Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability

et al. 2010

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Abstract.We develop an algorithm to compute pCO 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 2 observations from an autonomous mooring. There is a gradient in the air-sea CO 2 flux between the northeastern Cabot Strait region which acts as a net sink of CO 2 with an annual uptake of 0.50 to 1.00 mol C m −2 yr −1 , and the southwestern Gulf of Maine region which acts as a source ranging from −0.80 to −2.50 mol C m −2 yr −1 . There is a decline, or a negative trend, in the air-sea pCO 2 gradient of 23 µatm over the decade, which can be explained by a cooling of 1.3 • C over the same period. Regional conditions govern spatial, seasonal, and interannual variability on the Scotian Shelf, while multi-annual trends appear to be influenced by larger scale processes.

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Section: Shelf-wide Co 2 Fluxessupporting

confidence: 82%

Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability

et al. 2010

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“…pCO 2 values below atmospheric equilibrium also have been reported in other major river plumes, such as the Niger River (Körtzinger 2009) and the Congo River (Bakker et al 1999;Lefèvre 2009); however, integrated air-water CO 2 fluxes have not been computed as data coverage is quite low in these systems. It should also be noted that very small river plumes such as the Scheldt estuary (freshwater discharge Ͻ 4 km 3 yr −1 ) and the Kennebec (freshwater discharge ß8 km 3 yr −1 ) are a net source of CO 2 to the atmosphere (+1.9 mol m − yr −1 (Borges and Frankignoulle 2002) and +0.9 mol m − yr −1 (Salisbury et al 2009). …”

Section: A Tentative Estimate Of Global River-plume Co 2 Fluxmentioning

confidence: 99%

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Cai

Chen²,

Borges³

2013

Biogeochemical Dynamics at Major River-Coastal Interfaces

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“…While upwelling can also impact the CCE2 site located mid-shelf at 800 m bottom depth farther south in the CCE, this subregion in particular has shown sensitivity to climatic drivers, such as the El Niño-Southern Oscillation (ENSO; Nam et al, 2011). Seasonal temperature and freshwater inputs impact natural variability at the two coastal moorings in the Atlantic with the Gulf of Maine site located 10 km from shore at 65 m bottom depth (Salisbury et al, 2009) and Gray's Reef 70 km from shore at 20 m bottom depth (Xue et al, 2016). The Chuuk and La Parguera sites are located in coral reef ecosystems within a semi-closed atoll lagoon in Micronesia at 23 m bottom depth and a patch reef in the Caribbean Sea southwest of Puerto Rico at 5 m bottom depth, respectively.…”

Section: Observations Of Variability and Changementioning

confidence: 99%

Using present-day observations to detect when anthropogenic change forces surface ocean carbonate chemistry outside preindustrial bounds

et al. 2016

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Abstract. One of the major challenges to assessing the impact of ocean acidification on marine life is detecting and interpreting long-term change in the context of natural variability. This study addresses this need through a global synthesis of monthly pH and aragonite saturation state ( arag ) climatologies for 12 open ocean, coastal, and coral reef locations using 3-hourly moored observations of surface seawater partial pressure of CO 2 and pH collected together since as early as 2010. Mooring observations suggest open ocean subtropical and subarctic sites experience present-day surface pH and arag conditions outside the bounds of preindustrial variability throughout most, if not all, of the year. In general, coastal mooring sites experience more natural variability and thus, more overlap with preindustrial conditions; however, present-day arag conditions surpass biologically relevant thresholds associated with ocean acidification impacts on Mytilus californianus ( arag < 1.8) and Crassostrea gigas ( arag < 2.0) larvae in the California Current Ecosystem (CCE) and Mya arenaria larvae in the Gulf of Maine ( arag < 1.6). At the most variable mooring locations in coastal systems of the CCE, subseasonal conditions approached arag = 1. Global and regional models and data syntheses of ship-based observations tended to underestimate seasonal variability compared to mooring observations. Efforts such as this to characterize all patterns of pH and arag variability and change at key locations are fundamental to assessing present-day biological impacts of ocean acidification, further improving experimental design to interrogate organism response under real-world conditions, and improving predictive models and vulnerability assessments seeking to quantify the broader impacts of ocean acidification.

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Episodic riverine influence on surface DIC in the coastal Gulf of Maine

Cited by 61 publications

References 51 publications

Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability

Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Using present-day observations to detect when anthropogenic change forces surface ocean carbonate chemistry outside preindustrial bounds

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Episodic riverine influence on surface DIC in the coastal Gulf of Maine

Cited by 61 publications

References 51 publications

Air-Sea CO&lt;sub&gt;2&lt;/sub&gt; fluxes on the Scotian Shelf: seasonal to multi-annual variability

Air-Sea CO&lt;sub&gt;2&lt;/sub&gt; fluxes on the Scotian Shelf: seasonal to multi-annual variability

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Using present-day observations to detect when anthropogenic change forces surface ocean carbonate chemistry outside preindustrial bounds

Contact Info

Product

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Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability

Air-Sea CO<sub>2</sub> fluxes on the Scotian Shelf: seasonal to multi-annual variability