Diurnal variation of oxygen and carbonate system parameters in Tampa Bay and Florida Bay

Yates, Kimberly K.; Dufore, Chris; Smiley, Nathan A; Jackson, Courtney B.; Halley, Robert B.

doi:10.1016/j.marchem.2006.12.008

Cited by 129 publications

(116 citation statements)

References 39 publications

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“…Other bays in Florida, such as Tampa Bay, have been examined for diurnal trends in carbonate parameters (e.g. Yates et al 2007) and exhibit similar trends in seawater chemistry to those observed in the current study, but considerably lower pCO 2 values (maximum 580 matm for Tampa Bay and 497 matm for Florida Bay). High pCO 2 values may indicate that microbial respiration of organic matter is particularly high in Saint Joseph Bay during the autumn and winter months.…”

Section: Factors Influencing Carbonate Chemistrysupporting

confidence: 61%

“…In Florida Bay where seagrass beds are common, extensive variation in pH (7.85-8.1) and pCO 2 (325-725 matm) were observed in samples taken every 2 months (Millero et al 2001). Additionally, Florida Bay and Tampa Bay, FL, exhibited average diurnal differences (over a 3-day period) of 0.22 pH units and 218 matm pCO 2 (Yates et al 2007). These two studies demonstrate the need to understand the variability of the carbonate chemistry of coastal areas, particularly where seagrass beds dominate.…”

Section: Introductionmentioning

confidence: 78%

See 1 more Smart Citation

Variability of the carbonate chemistry in a shallow, seagrass-dominated ecosystem: implications for ocean acidification experiments

Challener

Robbins

McClintock

2016

Mar. Freshwater Res.

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Abstract. Open ocean observations have shown that increasing levels of anthropogenically derived atmospheric CO 2 are causing acidification of the world's oceans. Yet little is known about coastal acidification and studies are just beginning to characterise the carbonate chemistry of shallow, nearshore zones where many ecologically and economically important organisms occur. We characterised the carbonate chemistry of seawater within an area dominated by seagrass beds (Saint Joseph Bay, Florida) to determine the extent of variation in pH and pCO 2 over monthly and daily timescales. Distinct diel and seasonal fluctuations were observed at daily and monthly timescales respectively, indicating the influence of photosynthetic and respiratory processes on the local carbonate chemistry. Over the course of a year, the range in monthly values of pH (7.36-8.28), aragonite saturation state (0.65-5.63), and calculated pCO 2 (195-2537 matm) were significant. When sampled on a daily basis the range in pH (7.70-8.06), aragonite saturation state (1.86-3.85), and calculated pCO 2 (379-1019 matm) also exhibited significant range and indicated variation between timescales. The results of this study have significant implications for the design of ocean acidification experiments where nearshore species are utilised and indicate that coastal species are experiencing far greater fluctuations in carbonate chemistry than previously thought.

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Section: Factors Influencing Carbonate Chemistrysupporting

confidence: 61%

Section: Introductionmentioning

confidence: 78%

Variability of the carbonate chemistry in a shallow, seagrass-dominated ecosystem: implications for ocean acidification experiments

Challener

Robbins

McClintock

2016

Mar. Freshwater Res.

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“…Hofmann et al (2011) were able to capture diel cycles in pH, with the most consistent variations found in coral reef locations. The pH was at a maximum in the early evening and at a minimum in the morning with amplitudes between 0.1 and 0.25; this is similar in range to other studies based in subtropical estuaries (Yates et al, 2007).…”

Section: Introductionsupporting

confidence: 90%

Measuring pH variability using an experimental sensor on an underwater glider

et al. 2017

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Abstract. Autonomous underwater gliders offer the capability of measuring oceanic parameters continuously at high resolution in both vertical and horizontal planes, with timescales that can extend to many months. An experimental ionsensitive field-effect transistor (ISFET) sensor measuring pH on the total scale was attached to a glider during the REP14-MED experiment in June 2014 in the Sardinian Sea in the northwestern Mediterranean. During the deployment, pH was sampled at depths of up to 1000 m along an 80 km transect over a period of 12 days. Water samples were collected from a nearby ship and analysed for dissolved inorganic carbon concentration and total alkalinity to derive the pH for validating the ISFET sensor measurements. The vertical resolution of the pH sensor was good (1 to 2 m), but stability was poor and the sensor drifted in a non-monotonous fashion. In order to remove the sensor drift, a depth-constant time-varying offset was applied throughout the water column for each dive, reducing the spread of the data by approximately two-thirds. Furthermore, the ISFET sensor required temperature-and pressure-based corrections, which were achieved using linear regression. Correcting for this decreased the apparent sensor pH variability by a further 13 to 31 %. Sunlight caused an apparent sensor pH decrease of up to 0.1 in surface waters around local noon, highlighting the importance of shielding the sensor from light in future deployments. The corrected pH from the ISFET sensor is presented along with potential temperature, salinity, potential density anomalies (σ θ ), and dissolved oxygen concentrations (c(O 2 )) measured by the glider, providing insights into the physical and biogeochemical variability in the Sardinian Sea. The pH maxima were identified close to the depth of the summer chlorophyll maximum, where high c(O 2 ) values were also found. Longitudinal pH variations at depth (σ θ > 28.8 kg m −3 ) highlighted the variability of water masses in the Sardinian Sea. Higher pH was observed where salinity was > 38.65, and lower pH was found where salinity ranged between 38.3 and 38.65. The higher pH was associated with saltier Levantine Intermediate Water, and it is possible that the lower pH was related to the remineralisation of organic matter. Furthermore, shoaling isopycnals closer to shore coinciding with low pH and c(O 2 ), high salinity, alkalinity, dissolved inorganic carbon concentrations, and chlorophyll fluorescence waters may be indicative of upwelling.

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“…The pCO 2 diurnal variations observed in the two nearshore shallow water systems (8.9-42.3 Pa) were much higher than those in the open ocean (0.2-4.1 Pa, Goyet and Peltzer 1997;Bates et al 1998;DeGrandpre et al 2004) and some bay systems (5.2-22.1 Pa, Yates et al 2007;Dai et al 2009), and are comparable to those of coral reefs (4.2-86.1 Pa, Kayanne et al 1995;Gattuso et al 1996;Bates et al 2001). The rapidly changing pCO 2 clearly illustrates the need for high-resolution observations to resolve the temporal variability and obtain data that accurately represent the net flux in a dynamic region.…”

Section: Discussionmentioning

confidence: 70%

Short‐term dynamics of oxygen and carbon in productive nearshore shallow seawater systems off Taiwan: Observations and modeling

Jiang

Huang

Dai

et al. 2011

Limnology & Oceanography

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The diurnal to weekly dynamics of carbon and oxygen in two productive tropical-subtropical nearshore shallow water systems were investigated using a combination of time-series observation and modeling. The two sites, Aodi (121.93uE, 25.06uN) and Nanwan (120.85uE, 21.91uN), were characterized by limited freshwater input, strong tidal advection and, at Nanwan, upwelling. The diurnal ranges were 96-234 mmol kg 21 for dissolved inorganic carbon (DIC), 8.9-42.2 Pa for partial pressure of carbon dioxide (pCO 2 ), and 37-239 mmol kg 21 for dissolved oxygen. The diurnal variability increased from spring to neap tidal states at both sites. A model accounting for gas exchange, biological activities, tidal advection, and upwelling was developed to assess the biophysical interactions modulating the biogeochemical dynamics. The strongest driver of the diurnal variability was the net ecosystem production of the benthic-dominated nearshore ecosystem. Tidal advection buffered the accumulation of biological effects and the intensified dispersion lowered the diurnal amplitudes at spring tides. Tide-induced upwelling at Nanwan increased the surface inorganic carbon, and its decreasing intensity resulted in declines in DIC and pCO 2 from spring toward neap tide. The maximum community photosynthetic rates at Aodi and Nanwan were 295 and 120 mmol C m 22 h 21 , with ecosystem respiratory rates of 122 and 53 mmol C m 22 h 21 . The two autotrophic ecosystems were sinks for atmospheric CO 2 during the study period, with the average air-sea fluxes being 20.30 and 20.56 mmol C m 22 d 21 for Aodi and Nanwan.

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Diurnal variation of oxygen and carbonate system parameters in Tampa Bay and Florida Bay

Cited by 129 publications

References 39 publications

Variability of the carbonate chemistry in a shallow, seagrass-dominated ecosystem: implications for ocean acidification experiments

Variability of the carbonate chemistry in a shallow, seagrass-dominated ecosystem: implications for ocean acidification experiments

Measuring pH variability using an experimental sensor on an underwater glider

Short‐term dynamics of oxygen and carbon in productive nearshore shallow seawater systems off Taiwan: Observations and modeling

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