Daily and seasonal variability of CO2 saturation and evasion in a free flowing and in a dammed river reach

Pinardi, Monica; Rossetto, Marisa; Viaroli, Pierluigi; Bartoli, Marco

doi:10.4081/jlimnol.2014.947

Cited by 7 publications

(8 citation statements)

References 76 publications

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“…The CO 2 and CH 4 fluxes at the water–atmosphere interface were calculated according to Wanninkhof () considering the dependence of gas exchange rates on three main factors (a) the concentration gradient between the two media (i.e., the difference of the dissolved gas concentration from its theoretical value of water saturation), (b) the thickness of the boundary layer (i.e., the layer of stagnant water that the gas molecules must cross by molecular diffusion), and (c) the gas diffusive coefficient value ( K ) that depends on the water temperature. The theoretical CO 2 and CH 4 fluxes were estimated with the Equation , which is an empirical equation valid for stagnant or slowly flowing lowland rivers within areas with limited to no wind (see Pinardi et al, ; Pinardi, Rossetto, Viaroli, & Bartoli, ).

italicFlux = K * ((), ((), P_{gas} * K_{h}) - {[italicgas]}_{sat})

…”

Section: Methodsmentioning

confidence: 99%

Connectivity and habitat typology drive CO₂ and CH₄ fluxes across land–water interfaces in lowland rivers

et al. 2018

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Lowland rivers are assumed to be a net source of carbon dioxide (CO2) and methane (CH4). However, little is known about the contribution of marginal permanent and temporary riverine aquatic systems to river carbon metabolism. Elevation, in relation to flooding, hydro‐morphological, and ecological features of such habitats, can affect the gas fluxes across the water–atmosphere interfaces and the periodically air‐exposed riverbeds. This hypothesis was investigated in the lowland sector of the Po River (Northern Italy) from May to September 2008. Five different aquatic habitats were considered: the main river course; a backwater habitat; and three lateral lentic waterbodies—an oxbow and two quarry lakes of different age. The water mass was always CO2 and CH4 supersaturated, and gas fluxes were from the water to the atmosphere. In the highly dynamic river course and backwaters, CO2 emission rates were nearly one order of magnitude greater than in the lentic and hypoxic oxbow and quarry lakes. By contrast, CH4 fluxes peaked in the lentic, deeper, and permanent water bodies. At sediment–atmosphere interfaces, the CO2 emissions increased along an organic matter, a water saturation, and a chlorophyll a gradient, attaining the maximum rates in the periodically air‐exposed riverbed and marginal sandy sediments. These differences in gas fluxes resulted from either the submersion persistence or the alternation of submersion and emersion phases, which were ultimately due to the gap between elevation and river water variations. All this stresses the critical role of marginal aquatic habitats for river C budget.

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italicFlux = K * ((), ((), P_{gas} * K_{h}) - {[italicgas]}_{sat})

…”

Section: Methodsmentioning

confidence: 99%

Connectivity and habitat typology drive CO₂ and CH₄ fluxes across land–water interfaces in lowland rivers

et al. 2018

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“…Because the majority of time series studies are carried out in temperate lakes, studies in subtropical lakes are necessary to improve the global CO 2 efflux models. Seasonality in pCO 2 and airwater CO 2 fluxes, for example, has been reported in temperate lakes in which CO 2 influx often occurs in the summer (Pinardi et al 2014;Sejr et al 2014) and higher CO 2 emissions occur in winter (Trolle et al 2012). Fontes et al (2013) reported the highest CO 2 concentrations in the spring and the lowest levels in summer in Peri Lake, but no CO 2 flux was estimated.…”

Section: Introductionmentioning

confidence: 93%

Linking summer conditions to CO2 undersaturation and CO2 influx in a subtropical coastal lake

2015

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In this study, we tested the hypothesis that pCO 2 and air-water CO 2 fluxes in the surface waters of a subtropical lake vary on two time scales (diel and seasonally) and that CO 2 concentrations would decrease during the day and in summer. We estimated the variability of pCO 2 and the air-water CO 2 flux from pH-alkalinity in four 48-h periods that were representative of each subtropical season. There was high variability in pCO 2 and the air-water gas flux over 48 h, but there was no clear pattern between day and night. CO 2 concentrations showed a strong positive correlation with heterotrophic bacterial biomass and a negative correlation with dissolved organic carbon concentrations and water temperature. The lake was predominantly diel and seasonally CO 2 supersaturated; the highest CO 2 efflux was observed in the spring and a CO 2 influx was observed in summer. Our hypothesis was confirmed; pCO 2 was lowest in summer and during the daytime in spring and summer due to physical and biological conditions that favoured photosynthetic activities. These findings suggest that temporal shifts in the microbial community and meteorological variables, which are indirectly related to temperature, may be important drivers of CO 2 concentrations in Peri Lake. In conclusion, pCO 2 and the air-water CO 2 flux vary temporally (diel and seasonally) in the littoral zone of this subtropical coastal lake, with shifts between CO 2 influx and efflux throughout the sampling periods.

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“…The overall image was mediated by the almost complete knowledge on the water quality related parameters and the extended research. These areas are well-studied, and a large number of scientific papers is available forming a thorough knowledge database [13][14][15]. As an outcome, it would be favorable if Management Bodies of these PAs could focus on Water Quality and Pressures, a filed interconnected with monitoring practices for generating alert systems and the proper amount of information, extremely valuable for measures design towards pressures alleviation and water quality improvement.…”

Section: Resultsmentioning

confidence: 99%

Gap Analysis Targeting WFD Monitoring and Pressure Mapping: Lessons Learned from “EcoSUSTAIN”, Interreg-MED Project

Latinopoulos¹,

Sidiropoulos²,

Kagalou³

2018

EWaS3 2018

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According to WFD, European countries shall establish monitoring programmes for water quality overview. In EcoSUSTAIN, an Interreg–MED project, Gap analysis, an approach that reveals the difference between current and desired level, was carried out, targeting five Mediterranean hydro-ecosystems covering “Monitoring Practices” and “Water Quality and Pressures”. Our goal is to investigate practicing deficiencies, as long as information lack and distance from desirable status, supporting water uses and WFD goals. Data was collected by literature research supported by questionnaires. The findings on both fields, revealed problematic areas dealing with the compliance with the WFD and several deficiencies in tackling pressures.

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Daily and seasonal variability of CO2 saturation and evasion in a free flowing and in a dammed river reach

Abstract: The

Cited by 7 publications

References 76 publications

Connectivity and habitat typology drive CO₂ and CH₄ fluxes across land–water interfaces in lowland rivers

Connectivity and habitat typology drive CO₂ and CH₄ fluxes across land–water interfaces in lowland rivers

Linking summer conditions to CO2 undersaturation and CO2 influx in a subtropical coastal lake

Gap Analysis Targeting WFD Monitoring and Pressure Mapping: Lessons Learned from “EcoSUSTAIN”, Interreg-MED Project

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Daily and seasonal variability of CO2 saturation and evasion in a free flowing and in a dammed river reach

Abstract: The

Cited by 7 publications

References 76 publications

Connectivity and habitat typology drive CO2 and CH4 fluxes across land–water interfaces in lowland rivers

Connectivity and habitat typology drive CO2 and CH4 fluxes across land–water interfaces in lowland rivers

Linking summer conditions to CO2 undersaturation and CO2 influx in a subtropical coastal lake

Gap Analysis Targeting WFD Monitoring and Pressure Mapping: Lessons Learned from “EcoSUSTAIN”, Interreg-MED Project

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Connectivity and habitat typology drive CO₂ and CH₄ fluxes across land–water interfaces in lowland rivers

Connectivity and habitat typology drive CO₂ and CH₄ fluxes across land–water interfaces in lowland rivers