Aragonite saturation state in a tropical coastal embayment dominated by phytoplankton blooms (Guanabara Bay – Brazil)

Cotovicz, Luiz C.; Knoppers, Bastiaan A.; Brandini, Nilva; Poirier, Dominique; Santos, Suzan J. Costa; Abril, Gwénaël

doi:10.1016/j.marpolbul.2017.10.064

Cited by 18 publications

(17 citation statements)

References 74 publications

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“…In contrast, in the western area, which is far from the urban area and adjacent to the wetland, primary production produces an increase in Ω, and this region is an important area for shellfish farming in JZB [52]. A similar phenomenon was also observed in Fujian, Southeast China [53,54] and Guanabara Bay in Brazil [25]. Moreover, perennial eutrophication often causes algal blooms and produces strong primary production even under the low temperatures in winter in some waterbodies [55,56], offsetting the decrease in Ω caused by the low temperatures.…”

Section: Processes Controlling the Spatial Distribution Of Surface ω mentioning

confidence: 79%

“…The biological processes contributed the most to [TA-DIC] A , and the relative contribution was more than 60% in the northern area and the area near the estuary of the Haibo River. During this period, DO values in most areas of the entire bay were supersaturated, and primary production was dominant, which corresponds to the growth peak of phytoplankton in JZB in winter [25][26][27]. Overall, the average relative contributions of temperature, mixing processes and biological processes to [TA-DIC] A were 20%, 30% and 50%, respectively.…”

Section: Processes Controlling the Spatial Distribution Of Surface ω mentioning

confidence: 95%

“…Moreover, researchers estimated the change of Ω arag since the preindustrial period and by the end of this century using the CO2SYS program and a high CO 2 emission scenario Rcp8.5 in IPCC AR5 [24]. Cotoviz et al [25] investigated the dynamics of Ω arag in Guanabara Bay, Brazil, which is dominated by phytoplankton bloom. The slope of the linear regression between Ω arag and the apparent utilization of oxygen (AOU) had a very close behavior with the Redfield ratio.…”

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confidence: 99%

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Spatial Variation in Aragonite Saturation State and the Influencing Factors in Jiaozhou Bay, China

Zhang

Xue

et al. 2020

Water

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Both natural processes and human activities affect seawater calcium carbonate saturation state (Ωarag), while the mechanisms are still far from being clearly understood. This study analysed the seawater surface Ωarag during summer and winter in Jiaozhou Bay (JZB), China, based on two cruises observations performed in January and June 2017. The ranges of Ωarag values were 1.55~2.92 in summer and 1.62~2.15 in winter. Regression analyses were conducted to identify the drivers of the change of Ωarag distribution, and then the relative contributions of temperature, mixing processes and biological processes to the spatial differences in Ωarag were evaluated by introducing the difference between total alkalinity (TA) and dissolved inorganic carbon (DIC) as a proxy for Ωarag. The results showed that biological processes were the main factor affecting the spatial differences in Ωarag, with relative contributions of 70% in summer and 50% in winter. The contributions of temperature (25% in summer and 20% in winter) and the mixing processes (5% in summer and 30% in winter) were lower. The increasing urbanization in offshore areas can further worsen acidification, therefore environmental protection in both offshore and onshore is needed.

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Section: Processes Controlling the Spatial Distribution Of Surface ω mentioning

confidence: 79%

Section: Processes Controlling the Spatial Distribution Of Surface ω mentioning

confidence: 95%

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confidence: 99%

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Spatial Variation in Aragonite Saturation State and the Influencing Factors in Jiaozhou Bay, China

Zhang

Xue

et al. 2020

Water

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“…This ratio evidences the sensitivity of the system to perturbations in dissolved seawater CO 2 concentration [ 57 ]. If the DIC to TA ratio equals 1, any addition/removal of CO 2 (in the form of DIC) will result in a maximum decrease/increase of seawater pH and Ω arg [ 58 ], with soluble CO 2 being more sensitive to temperature changes. Thus, TA and DIC changes controlled the pH decrease and Ω arg we observed in BB during the wet season ( Fig 4 ).…”

Section: Resultsmentioning

confidence: 99%

Carbonate chemistry seasonality in a tropical mangrove lagoon in La Parguera, Puerto Rico

et al. 2021

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We investigated the seasonal carbonate chemistry variability within a semi-enclosed tropical mangrove lagoon in southwestern Puerto Rico. Biweekly measurements of seawater temperature, salinity, total alkalinity (TA), and dissolved inorganic carbon (DIC) were conducted from 2014 to 2018. We describe the possible mechanisms driving the observed variability by correlating the DIC/TA ratio with pH and Ωarg, suggesting that the mean pH (7.87 ± 0.09) and aragonite saturation state (Ωarg, 2.96 ± 0.47) of the mangrove lagoon negatively affected calcification. The measured pCO2 and DIC/TA ratios indicate that heterotrophic activity was the primary driver for persistent acidification, which reached its maximum expression during the wet season. We conclude that mangrove lagoons with limited seawater exchange and high carbon input will not mitigate ocean acidification.

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“…The process of carbonate dissolution consumes DIC of the water column, and adds δ 13 C with an isotopic signature closest to that of marine carbonates (0‰), turning the waters enriched in 13 C relative to the conservative mixing (Alling et al, 2012). However, this process is unlikely to occur in the bay since that the values of pCO 2 in quadrant IV are low and the pH values are high (Cotovicz et al 2018b). Actually, DIC and δ 13 C-DIC can be subjected simultaneously to more than one process and not just by a specific one (Samanta et al, 2015).…”

Section: Influence Of the Phytoplankton Fractionation On The δ 13 C-dmentioning

confidence: 99%

Sources and sinks of dissolved inorganic carbon in an urban tropical coastal bay revealed by δ13C-DIC signals

Cotovicz

Knoppers

Deirmendjian

et al. 2019

Estuarine, Coastal and Shelf Science

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Dissolved inorganic carbon (DIC), its stable isotope composition (δ 13 C-DIC) and ancillary parameters of the water column were investigated in a eutrophic tropical marine-dominated estuary surrounded by a large urban area (Guanabara Bay, Rio de Janeiro, Brazil). Most negative δ 13 C-DIC signatures (down to −6.1‰) were found in polluted regions affected by direct sewage discharges where net heterotrophy induces high partial pressure of CO 2 (pCO 2) and DIC concentrations. Keeling plot was applied to this polluted region and determined the δ 13 C-DIC sewage signature source of −12.2‰, which is very consistent with isotopic signature found in wastewater treatment plans. These negative δ 13 C-DIC signatures (i.e., DIC depleted in 13 C) were restricted to the vicinity of urban outlets, whereas in the largest area of the bay δ 13 C-DIC signatures were more positive (i.e., DIC enriched in 13 C). The most positive δ 13 C-DIC signatures (up to 4.6‰) were found in surface waters dominated by large phytoplankton blooms, with positive correlation with chlorophyll a (Chl a). In the largest area of the bay, the preferential uptake of the lighter stable carbon isotope (12 C) during photosynthesis followed the Rayleigh distillation, and appeared as the most important driver of δ 13 C-DIC variations. This reveals an important isotopic fractionation (ε) by phytoplankton due to successive algal blooms that has turned the remaining DIC pool enriched with the heavier stable carbon isotope (13 C). The calculated diel apparent ε showed higher values in the morning (18.7‰-21.6‰) and decreasing in the afternoon (6.8‰-11.1‰). ε was positively correlated to the pCO 2 (R 2 = 0.88, p = 0.005) and DIC concentrations (R 2 = 0.73, p = 0.02), suggesting a decline in carbon assimilation efficiency and decreasing uptake of the lighter carbon under CO 2 limiting conditions. The eutrophic coastal waters of Guanabara Bay have δ 13 C-DIC signatures well above that found in estuaries, shelf and ocean waters worldwide.

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Aragonite saturation state in a tropical coastal embayment dominated by phytoplankton blooms (Guanabara Bay – Brazil)

Cited by 18 publications

References 74 publications

Spatial Variation in Aragonite Saturation State and the Influencing Factors in Jiaozhou Bay, China

Spatial Variation in Aragonite Saturation State and the Influencing Factors in Jiaozhou Bay, China

Carbonate chemistry seasonality in a tropical mangrove lagoon in La Parguera, Puerto Rico

Sources and sinks of dissolved inorganic carbon in an urban tropical coastal bay revealed by δ13C-DIC signals

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