The biogeochemical cycling of methane in Ria de Vigo, NW Spain: Sediment processing and sea–air exchange

Kitidis, Vassilis; Tizzard, Louise; Uher, G; Judd, Alan; Upstill‐Goddard, Robert C.; Head, Ian M.; Gray, Neil; Taylor, Gillian; Durán, Ruth; Díez, Raquel Montes; Iglesias, Jorge; García‐Gil, Soledad

doi:10.1016/j.jmarsys.2006.03.022

Cited by 22 publications

(7 citation statements)

References 70 publications

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“…Forster et al, 2009) and are lower than previous measurements over other aquatic systems. Kitidis et al (2007) measured a CH 4 emission of 63 µmole m −2 d −1 using a floating chamber in the Ria de Vigo (a large coastal embayment), consistent with wind-driven turbulent diffusivity models for the conditions at the time of the chamber deployment. These authors also estimated fluxes up to 170 µmole m −2 d −1 during periods when the chamber was not deployed.…”

Section: Ch 4 Fluxsupporting

confidence: 60%

“…Global CH 4 emissions from coastal regions are poorly quantified and may be influenced by processes such as riverine outflow and tidal circulations. In shallow waters, ebullition (bubbles rising from the sediment) represents an additional pathway for CH 4 transfer (Dimitrov, 2002;Kitidis et al, 2007). Some bubbles are not fully dissolved in seawater before surfacing and this transfer to the atmosphere is not accounted for in bulk flux calculations based on aqueous CH 4 concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Air–sea fluxes of CO2 and CH4 from the Penlee Point Atmospheric Observatory on the south-west coast of the UK

et al. 2016

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Abstract. We present air-sea fluxes of carbon dioxide (CO 2 ), methane (CH 4 ), momentum, and sensible heat measured by the eddy covariance method from the recently established Penlee Point Atmospheric Observatory (PPAO) on the south-west coast of the United Kingdom. Measurements from the south-westerly direction (open water sector) were made at three different sampling heights (approximately 15, 18, and 27 m above mean sea level, a.m.s.l.), each from a different period during 2014-2015. At sampling heights ≥ 18 m a.m.s.l., measured fluxes of momentum and sensible heat demonstrate reasonable (≤ ±20 % in the mean) agreement with transfer rates over the open ocean. This confirms the suitability of PPAO for air-sea exchange measurements in shelf regions. Covariance air-sea CO 2 fluxes demonstrate high temporal variability. Air-to-sea transport of CO 2 declined from spring to summer in both years, coinciding with the breakdown of the spring phytoplankton bloom. We report, to the best of our knowledge, the first successful eddy covariance measurements of CH 4 emissions from a marine environment. Higher sea-to-air CH 4 fluxes were observed during rising tides (20 ± 3; 38 ± 3; 29 ± 6 µmole m −2 d −1 at 15, 18, 27 m a.m.s.l.) than during falling tides (14 ± 2; 22 ± 2; 21 ± 5 µmole m −2 d −1 ), consistent with an elevated CH 4 source from an estuarine outflow driven by local tidal circulation. These fluxes are a few times higher than the predicted CH 4 emissions over the open ocean and are significantly lower than estimates from other aquatic CH 4 hotspots (e.g. polar regions, freshwater). Finally, we found the detection limit of the air-sea CH 4 flux by eddy covariance to be 20 µmole m −2 d −1 over hourly timescales (4 µmole m −2 d −1 over 24 h).

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Section: Ch 4 Fluxsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Air–sea fluxes of CO2 and CH4 from the Penlee Point Atmospheric Observatory on the south-west coast of the UK

et al. 2016

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“…Methane saturations of up to 8,000 % have been reported for some shallow coastal embayments (Ferrón et al 2007;Kitidis et al 2007). A CH 4 saturation of up to 20,000 % may be typical of the mid-to upper-inner estuary Abril and Iversen 2002;Middelburg et al 2002).…”

Section: Coastal Watersmentioning

confidence: 97%

Air-Sea Interactions of Natural Long-Lived Greenhouse Gases (CO2, N2O, CH4) in a Changing Climate

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Bange

Gruber

et al. 2013

Ocean-Atmosphere Interactions of Gases and Particles

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Understanding and quantifying ocean-atmosphere exchanges of the long-lived greenhouse gases carbon dioxide (CO 2 ), nitrous oxide (N 2 O) and methane (CH 4 ) are important for understanding the global biogeochemical cycles of carbon and nitrogen in the context of ongoing global climate change. In this chapter we summarise our current state of knowledge regarding the oceanic distributions, formation and consumption pathways, and oceanic uptake and emissions of CO 2 , N 2 O and CH 4 , with a particular emphasis on the upper ocean. We specifically consider the role of the ocean in regulating the tropospheric content of these important radiative gases in a world in which their tropospheric content is rapidly increasing and estimate the impact of global change on their present and future oceanic uptake and/or emission. Finally, we evaluate the various uncertainties associated with the most commonly used methods for estimating uptake and emission and identify future research needs.

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“…On the other hand, the biogenic gas is formed at low temperatures by microbial methanogenesis that is the degradation of organisms such as planktonic matters, plants, fishes, and other organic material under anaerobic conditions (Kitidis et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Acoustic Mapping of Gas Charged Sediments and Living Benthic Foraminifera Assemblages From the Ne Region of the Guanabara Bay (Rj, Brazil)

et al. 2016

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. High-resolution acoustic mapping of gas charged sediments and living benthic foraminifera assemblages from the NE region of the Guanabara Bay (RJ, Brazil). Journal of Sedimentary Environments, 1 (3): 360-384. AbstractThis work was performed in the NE region of the Guanabara Bay, a highly impacted Brazilian coastal system, located in Rio de Janeiro State. It aimed to: i) identify and map the areas with occurrence of gas in the sediment, as well as its acoustic signature; ii) characterize the physical properties of the sediments and; iii) document the response of microbenthic organisms (living benthic foraminifera) to changes in quantity and quality of organic matter. Seismic surveys at the frequency of 12 kHz identified a large area with about 50% gas charged sediments in the study area.The main acoustic signatures of the shallow gas were black shadow and gas blanket. In addition, features related to gas seepages to the water column (acoustic plumes and pockmarks) and gas percolation within the sediments (intrasedimentary plumes, turbidity pinnacles) were also identified. The gas has a biogenic origin and results from the high acumulation rate between 0.03 to 0.9 cm.year -1 and from the decomposition of large amount of organic matter (10-20%). Vertical distribution of gas ranges from few centimeters to 9 m below the water-sediments interface. These occurrences are related to both gas migration from lower sedimentary layers to Holocene muds above, and to recent generation in near-surface sediments as the area display favorable conditions for gas production. Cores ranging from 150-240 cm in length have predominantly muddy sediments and variations in the P-wave velocity followed the changes in sediment density, controlled mainly by the presence of gas in sediments, bioclasts accumulation, textural variation and percentage of organic matter. Journal of Sedimentary Environments

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The biogeochemical cycling of methane in Ria de Vigo, NW Spain: Sediment processing and sea–air exchange

Cited by 22 publications

References 70 publications

Air–sea fluxes of CO<sub>2</sub> and CH<sub>4</sub> from the Penlee Point Atmospheric Observatory on the south-west coast of the UK

Air–sea fluxes of CO<sub>2</sub> and CH<sub>4</sub> from the Penlee Point Atmospheric Observatory on the south-west coast of the UK

Air-Sea Interactions of Natural Long-Lived Greenhouse Gases (CO2, N2O, CH4) in a Changing Climate

High-Resolution Acoustic Mapping of Gas Charged Sediments and Living Benthic Foraminifera Assemblages From the Ne Region of the Guanabara Bay (Rj, Brazil)

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The biogeochemical cycling of methane in Ria de Vigo, NW Spain: Sediment processing and sea–air exchange

Cited by 22 publications

References 70 publications

Air–sea fluxes of CO&lt;sub&gt;2&lt;/sub&gt; and CH&lt;sub&gt;4&lt;/sub&gt; from the Penlee Point Atmospheric Observatory on the south-west coast of the UK

Air–sea fluxes of CO&lt;sub&gt;2&lt;/sub&gt; and CH&lt;sub&gt;4&lt;/sub&gt; from the Penlee Point Atmospheric Observatory on the south-west coast of the UK

Air-Sea Interactions of Natural Long-Lived Greenhouse Gases (CO2, N2O, CH4) in a Changing Climate

High-Resolution Acoustic Mapping of Gas Charged Sediments and Living Benthic Foraminifera Assemblages From the Ne Region of the Guanabara Bay (Rj, Brazil)

Contact Info

Product

Resources

About

Air–sea fluxes of CO<sub>2</sub> and CH<sub>4</sub> from the Penlee Point Atmospheric Observatory on the south-west coast of the UK

Air–sea fluxes of CO<sub>2</sub> and CH<sub>4</sub> from the Penlee Point Atmospheric Observatory on the south-west coast of the UK