Estuary-specific variation in the air-water gas exchange coefficient for oxygen

Kremer, James N.; Reischauer, Alyssa; D’Avanzo, Charlene

doi:10.1007/bf02803341

Cited by 75 publications

(66 citation statements)

References 19 publications

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“…We found that changes in the k values by a factor of 2 affected the final groundwater discharge fluxes by , 40%. Although there are many different equations used to estimate k values, the approach by Kremer et al (2003) was considered the most appropriate in this study based on the similar dimension of the studied estuaries (shallow coastal systems with little fetch). A linear relationship between the slope of the regression of k 600 vs. u 10 and the surface area of disparate waterbodies (Beaulieu et al 2012) shows that changes of k 600 were strongly affected by the surface area that represents the fetch of the estuary.…”

Section: Discussionmentioning

confidence: 99%

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Dynamics of groundwater‐derived nitrate and nitrous oxide in a tidal estuary from radon mass balance modeling

Wong

Grace

Cartwright

et al. 2013

Limnology & Oceanography

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Section: Discussionmentioning

confidence: 99%

“…The gas transfer velocity was computed using the empirical relationship constructed by Kremer et al (2003) and was corrected based on the Schmidt number (Sc):…”

Section: Methodsmentioning

confidence: 99%

Dynamics of groundwater‐derived nitrate and nitrous oxide in a tidal estuary from radon mass balance modeling

Wong

Grace

Cartwright

et al. 2013

Limnology & Oceanography

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“…Ebullition can play an important role during turbulent conditions when bubbles are triggered to escape from the ditch bottom and also low air pressure can cause an increase in ebullition (Hendriks et al 2008). Besides, during turbulent conditions the aquatic boundary layer thickness is decreased and the potential diffusion rate increases (Kremer et al 2003;Minkkinen and Laine 2006). Because an integration-based approach may lead to overestimation due to exceptionally high emissions eg.…”

Section: Discussionmentioning

confidence: 99%

Methane emissions in two drained peat agro-ecosystems with high and low agricultural intensity

Schrier-Uijl

Kroon

Leffelaar³

et al. 2009

Plant Soil

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Methane (CH 4 ) emissions were compared for an intensively and extensively managed agricultural area on peat soils in the Netherlands to evaluate the effect of reduced management on the CH 4 balance. Chamber measurements (photoacoustic methods) for CH 4 were performed for a period of three years in the contributing landscape elements in the research sites. Various factors influencing CH 4 emissions were evaluated and temperature of water and soil was found to be the main driver in both sites. For upscaling of CH 4 fluxes to landscape scale, regression models were used which were specific for each of the contributing landforms. Ditches and bordering edges were emission hotspots and emitted together between 60% and 70% of the total terrestrial CH 4 emissions. To further evaluate the effect of agricultural activity on the CH 4 balance, the annual CH 4 fluxes of the two managed sites were also compared to the emissions of a natural peat site with no management and high ground water levels. By comparing the terrestrial and additional farm based emissions of the three sites, we finally concluded that transformation of intensively managed agricultural land to nature development will lead to an increase in terrestrial CH 4 emission, but will not by definition lead to a significant increase in CH 4 emission when farm based emissions are included.

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“…NEP computed using this gas transfer parameterization is closer to the one derived from the in situ incubations (242 6 9 mmol C m 22 d 21 ) and could explain the observed discrepancy between the two methods using our nominal settings. The gas transfer velocity has been shown to be site specific in estuaries (Kremer et al 2003b;Borges et al 2004a). This is in part related to the contribution of tidal currents that, in macrotidal estuaries, strongly enhances water turbulence and the gas transfer velocity in addition to wind stress (Zappa et al 2003;Borges et al 2004a).…”

Section: Loicz Biogeochemical Budgets Applied To Dicmentioning

confidence: 99%

Planktonic and whole system metabolism in a nutrient-rich estuary (the Scheldt estuary)

et al. 2005

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Planktonic gross primary production (GPP), community respiration (CR), and nitrification (NIT) were measured monthly in the Scheldt estuary by the oxygen incubation method in 2003. No significant evolution of planktonic GPP was observed since the 1990s with high rates in the freshwater area (salinity 0; 97 6 65 mmol C m 22 d 21 ) decreasing seaward (22-37 mmol C m 22 d 21 ). A significant decrease of NIT was observed with regard to previous investigations although this process still represents up to 20% of total organic matter production in the inner estuary. Planktonic CR was highest in the inner estuary and seemed to be mainly controlled by external organic matter inputs. Planktonic net community production was negative most of the time in the estuary with values ranging from 2300 to 165 mmol C m 22 d 21 . Whole estuary net ecosystem production (NEP) was investigated on an annual scale using the results mentioned above and published benthic metabolic rates. A NEP of 239 6 8 mmol C m 22 d 21 was estimated, which confirms the strong heterotrophic status of this highly nutrified estuary. NEP rates were computed from June to December 2003 to compare with results derived from the Land-Ocean Interaction in the Coastal Zone budgeting procedure applied to dissolved inorganic phosphorus and carbon (DIP and DIC). DIP budgets failed to provide realistic estimates in the inner estuary where abiotic processes account for more than 50% of the nonconservative DIP flux. DIC budgets predicted a much lower NEP than in situ incubations (2109 6 31 versus 242 6 9 mmol C m 22 d 21 ) although, as each approach is associated with several critical assumptions, the source of this discrepancy remains unclear.

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Estuary-specific variation in the air-water gas exchange coefficient for oxygen

Cited by 75 publications

References 19 publications

Dynamics of groundwater‐derived nitrate and nitrous oxide in a tidal estuary from radon mass balance modeling

Dynamics of groundwater‐derived nitrate and nitrous oxide in a tidal estuary from radon mass balance modeling

Methane emissions in two drained peat agro-ecosystems with high and low agricultural intensity

Planktonic and whole system metabolism in a nutrient-rich estuary (the Scheldt estuary)

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