pH variability and CO2 induced acidification in the North Sea

Blackford, Jerry; Gilbert, F.

doi:10.1016/j.jmarsys.2006.03.016

Cited by 173 publications

(153 citation statements)

References 32 publications

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“…The present-day pH we measured matched the value reported by Blackford and Gilbert (2007) for the southern North Sea (8.10 vs. 8.06 ± 0.06 SD), thus pH gradations realized in our study closely mimicked near-future pH levels. However, considering the use of HCl, it has to be taken into account that there are differences in carbonate system changes depending on whether pH is altered by HCl or CO 2 additions.…”

Section: Carbonate System Perturbationssupporting

confidence: 88%

“…The experimental design consisted of three pH levels, which were the current seawater in situ pH (8.10) and two near-future pH levels, pH 7.81 and pH 7.67. The mean surface pH in the southern North Sea may reach these values by the year 2100, assuming atmospheric CO 2 of 700 or 1,000 ppm, respectively (Blackford and Gilbert 2007). We acidified water samples with 2 M HCl.…”

Section: Methodsmentioning

confidence: 99%

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Study on the effects of near-future ocean acidification on marine yeasts: a microcosm approach

et al. 2013

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Marine yeasts play an important role in biodegradation and nutrient cycling and are often associated with marine flora and fauna. They show maximum growth at pH levels lower than present-day seawater pH. Thus, contrary to many other marine organisms, they may actually profit from ocean acidification. Hence, we conducted a microcosm study, incubating natural seawater from the North Sea at present-day pH (8.10) and two near-future pH levels (7.81 and 7.67). Yeasts were isolated from the initial seawater sample and after 2 and 4 weeks of incubation. Isolates were classified by matrix-assisted laser desorption/ ionization time-of-flight mass spectrometry (MALDI-TOF MS) and representative isolates were identified by partial sequencing of the large subunit rRNA gene. From the initial seawater sample, we predominantly isolated a yeast-like filamentous fungus related to Aureobasidium pullulans, Cryptococcus sp., Candida sake, and various cold-adapted yeasts. After incubation, we found more different yeast species at near-future pH levels than at present-day pH. Yeasts reacting to low pH were related to Leucosporidium scottii, Rhodotorula mucilaginosa, Cryptococcus sp., and Debaryomyces hansenii. Our results suggest that these yeasts will benefit from seawater pH reductions and give a first indication that the importance of yeasts will increase in a more acidic ocean.

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Section: Carbonate System Perturbationssupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Study on the effects of near-future ocean acidification on marine yeasts: a microcosm approach

et al. 2013

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“…This has implications for modeling studies investigating the impact of OA on marine ecosystems. For example, Blackford and Gilbert [2007] predicted a 20% decrease in pelagic nitrification by 2100. Our data suggest that a separate parameterization of this effect is required for the benthic component of such ecosystem models.…”

Section: Nh 3 Oxidation Under Long-term Co 2 Exposurementioning

confidence: 99%

Impact of ocean acidification on benthic and water column ammonia oxidation

Kitidis

Laverock

McNeill

et al. 2011

Geophys. Res. Lett.

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[1] Ammonia oxidation is a key microbial process within the marine N-cycle. Sediment and water column samples from two contrasting sites in the English Channel (mud and sand) were incubated (up to 14 weeks) in CO 2 -acidified seawater ranging from pH 8.0 to pH 6.1. Additional observations were made off the island of Ischia (Mediterranean Sea), a natural analogue site, where long-term thermogenic CO 2 ebullition occurs (from pH 8.2 to pH 7.6). Water column ammonia oxidation rates in English Channel samples decreased under low pH with near-complete inhibition at pH 6.5. Water column Ischia samples showed a similar though not statistically significant trend. However, sediment ammonia oxidation rates at all three locations were not affected by reduced pH. These observations may be explained by buffering within sediments or low-pH adaptation of the microbial ammonia oxidizing communities. Our observations have implications for modeling the future impact of ocean acidification on marine ecosystems. Citation: Kitidis, V.,

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“…Orr et al, 2005) and coastal seas (e.g. Blackford and Gilbert, 2007), and the large impact that future pH changes may have on biogeochemical processes and organisms (e.g. Gazeau et al, 2007;Guinotte and Fabry, 2008), it is desirable to obtain a better quantitative understanding of factors that regulate pH in natural aquatic systems.…”

Section: Introductionmentioning

confidence: 99%

pH modelling in aquatic systems with time-variable acid-base dissociation constants applied to the turbid, tidal Scheldt estuary

et al. 2009

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Abstract.A new pH modelling approach is presented that explicitly quantifies the influence of biogeochemical processes on proton cycling and pH in an aquatic ecosystem, and which accounts for time variable acid-base dissociation constants. As a case study, the method is applied to investigate proton cycling and long-term pH trends in the Scheldt estuary (SW Netherlands, N Belgium). This analysis identifies the dominant biogeochemical processes involved in proton cycling in this heterotrophic, turbid estuary. Furthermore, information on the factors controlling the longitudinal pH profile along the estuary as well as long-term pH changes are obtained. Proton production by nitrification is identified as the principal biological process governing the pH. Its acidifying effect is mainly counteracted by proton consumption due to CO 2 degassing. Overall, CO 2 degassing generates the largest proton turnover in the whole estuary on a yearly basis. The main driver of long-term changes in the mean estuarine pH over the period 2001 to 2004 is the decreasing freshwater flow, which influences the pH directly via a decreasing supply of dissolved inorganic carbon and alkalinity, and also indirectly, via decreasing ammonia loadings and lower nitrification rates.

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pH variability and CO2 induced acidification in the North Sea

Cited by 173 publications

References 32 publications

Study on the effects of near-future ocean acidification on marine yeasts: a microcosm approach

Study on the effects of near-future ocean acidification on marine yeasts: a microcosm approach

Impact of ocean acidification on benthic and water column ammonia oxidation

pH modelling in aquatic systems with time-variable acid-base dissociation constants applied to the turbid, tidal Scheldt estuary

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