Coastal Acidification by Rivers:A Threat to Shellfish?

Salisbury, Joseph E.; Green, Mark; Hunt, Christopher W; Campbell, J. W.

doi:10.1029/2008eo500001

Cited by 268 publications

(235 citation statements)

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“…7.2). Therefore, the rapid pCO 2 decrease to a minimum (or pH increase to a maximum) observed in many middle-latitude river plumes Guo et al 2012) cannot be attributed simply to thermodynamic changes during riverocean mixing as was presented in Salisbury et al (2008). Large rivers in middle-latitudes are also rich in nutrients derived from use of agriculture fertilizers and sewage.…”

Section: Co 2 Degassing Flux In Inner Estuariesmentioning

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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Section: Co 2 Degassing Flux In Inner Estuariesmentioning

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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“…In addition, as most rivers are acidic, and have saturation states for aragonite (Ω) lower than receiving ocean waters, dynamic gradients in pH and Ω exist along salinity gradients in coastal waters, which sometimes show conservative behaviour, dominated by mixing processes (e.g. Salisbury et al 2008), but can be affected by in situ metabolic processes, deviating from conservative behaviour, in others (e.g. Cai et al 2011).…”

Section: Regulation Of Seawater Ph In the Pre-disturbed Holocene Oceanmentioning

confidence: 99%

Is Ocean Acidification an Open-Ocean Syndrome? Understanding Anthropogenic Impacts on Seawater pH

Duarte

Hendriks

Moore

et al. 2013

Estuaries and Coasts

594

452

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Ocean acidification due to anthropogenic CO 2 emissions is a dominant driver of long-term changes in pH in the open ocean, raising concern for the future of calcifying organisms, many of which are present in coastal habitats. However, changes in pH in coastal ecosystems result from a multitude of drivers, including impacts from watershed processes, nutrient inputs, and changes in ecosystem structure and metabolism. Interaction between ocean acidification due to anthropogenic CO 2 emissions and the dynamic regional to local drivers of coastal ecosystems have resulted in complex regulation of pH in coastal waters. Changes in the watershed can, for example, lead to changes in alkalinity and CO 2 fluxes that, together with metabolic processes and oceanic dynamics, yield high-magnitude decadal changes of up to 0.5 units in coastal pH. Metabolism results in strong diel to seasonal fluctuations in pH, with characteristic ranges of 0.3 pH units, with metabolically intense habitats exceeding this range on a daily basis. The intense variability and multiple, complex controls on pH implies that the concept of ocean acidification due to anthropogenic CO 2 emissions cannot be transposed to coastal ecosystems directly. Furthermore, in coastal ecosystems, the detection of trends towards acidification is not trivial and the attribution of these changes to anthropogenic CO 2 emissions is even more problematic. Coastal ecosystems may show acidification or basification, depending on the balance between the invasion of coastal waters by anthropogenic CO 2 , watershed export of alkalinity, organic matter and CO 2 , and changes in the balance between primary production, respiration and calcification rates in response to changes in nutrient inputs and losses of ecosystem components. Hence, we contend that ocean acidification from anthropogenic CO 2 is largely an open-ocean syndrome and that a concept of anthropogenic impacts on marine pH, which is applicable across the entire ocean, from coastal to open-ocean environments, provides a superior framework to consider the multiple components of the anthropogenic perturbation of marine pH trajectories. The concept of anthropogenic impacts on seawater pH acknowledges that a regional focus is necessary to predict future trajectories in the pH of coastal waters and points at opportunities to manage these trajectories locally to conserve coastal organisms vulnerable to ocean acidification.

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“…Increases in pH with depth were also noted by Atkins (1922) as a feature of one of the earliest studies of pH in the ocean. Some regions, particularly estuaries and coastal regions, show large seasonal and spatial variations in pH (Salisbury et al, 2008); indeed, they have been among the first regions to demonstrate significant ecological change as a result of a steep decline in seawater pH over time (for example, study of benthic algal and invertebrate community by Wootton et al, 2008).…”

Section: Ocean Acidification and Microbesmentioning

confidence: 99%

Will ocean acidification affect marine microbes?

2010

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The pH of the surface ocean is changing as a result of increases in atmospheric carbon dioxide (CO2), and there are concerns about potential impacts of lower pH and associated alterations in seawater carbonate chemistry on the biogeochemical processes in the ocean. However, it is important to place these changes within the context of pH in the present-day ocean, which is not constant; it varies systematically with season, depth and along productivity gradients. Yet this natural variability in pH has rarely been considered in assessments of the effect of ocean acidification on marine microbes. Surface pH can change as a consequence of microbial utilization and production of carbon dioxide, and to a lesser extent other microbially mediated processes such as nitrification. Useful comparisons can be made with microbes in other aquatic environments that readily accommodate very large and rapid pH change. For example, in many freshwater lakes, pH changes that are orders of magnitude greater than those projected for the twenty second century oceans can occur over periods of hours. Marine and freshwater assemblages have always experienced variable pH conditions. Therefore, an appropriate null hypothesis may be, until evidence is obtained to the contrary, that major biogeochemical processes in the oceans other than calcification will not be fundamentally different under future higher CO2/lower pH conditions.

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Coastal Acidification by Rivers:A Threat to Shellfish?

Cited by 268 publications

References 0 publications

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

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

Is Ocean Acidification an Open-Ocean Syndrome? Understanding Anthropogenic Impacts on Seawater pH

Will ocean acidification affect marine microbes?

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