Biogenic fluxes of halomethanes from Irish peatland ecosystems

Dimmer, Claudia H.; Simmonds, Peter; Nickless, G.; Bassford, Matt

doi:10.1016/s1352-2310(00)00151-5

Cited by 155 publications

(192 citation statements)

References 48 publications

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“…In the past decade, studies have revealed that Cl -participates in a complex biogeochemical cycle Winterton 2000;Lee et al 2001;Myneni 2002;Öberg 2002), involving for example, formation and degradation of chlorinated organic matter (consumption and release of Cl -), volatilization, leaching and precipitation (Asplund et al 1993;Öberg and Grön 1998;Dimmer et al 2001;Hoekstra et al 2001;Johansson et al 2001;Rodstedth et al 2003;Öberg et al 2005a). Areas receiving rather high Cl -deposition (30-50 kg ha -1 yr -1 ) on the west coast in Sweden have a higher amount of chlorinated organic matter in the soil than sites on the east coast receiving Cl -amounts of less than 5 kg ha -1 yr -1 (Johansson et al 2003).…”

Section: Is Chloride Conservative?mentioning

confidence: 99%

Is chloride a conservative ion in forest ecosystems?

2010

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Chloride (Cl -) has often been assumed to be relatively unreactive in forest ecosystems, and is frequently used as a conservative tracer to calculate fluxes of water and other ions. Recently, however, several studies have detailed cycling of Cl -in vegetation and soils. In this study Cl -budgets are compiled from 32 catchment studies to determine the extent to which Cl -is conserved in the passage through forest ecosystems. Chloride budgets from these sites vary from net retention (input>output) to net release (output>input). In the overall data set,

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Section: Is Chloride Conservative?mentioning

confidence: 99%

Is chloride a conservative ion in forest ecosystems?

2010

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“…[3] Several terrestrial sources of CH 3 Br have been identified [Gan et al, 1998;Varner et al, 1999b;Redeker et al, 2000;Rhew et al, 2000;Dimmer et al, 2001;Rhew et al, 2001]. The production mechanism of CH 3 Br in these ecosystems is uncertain.…”

Section: Introductionmentioning

confidence: 99%

Production of methyl bromide in a temperate forest soil

Varner

White

Mosedale

et al. 2003

Geophysical Research Letters

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[1] Field enclosure measurements of a temperate forest soil show net uptake of ambient methyl bromide (CH 3 Br), an important trace gas in both tropospheric and stratospheric ozone cycling. The net flux for 1999 was estimated to be À168 ± 72 mg CH 3 Br m À2 (negative indicates loss from the atmosphere). Individual enclosure flux measurements ranged from À4.0 to +3.3 mg CH 3 Br m À2 d À1 . Soil consumption of CH 3 Br was estimated from laboratory soil incubations. Production of CH 3 Br was calculated as the difference between net flux and predicted consumption. Fungi could be responsible for the production of CH 3 Br in this temperate forest soil.

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“…The area immediately surrounding MHD is very sparsely populated, providing very low local anthropogenic emissions. The area surrounding MHD is generally wet and boggy with areas of exposed rock (Dimmer et al, 2001). The sample inlet is located 90 m inland from the shoreline (5 meters …”

Section: Mace Head (Mhd)mentioning

confidence: 99%

“…Metadata stored within log files in GCWerks describes each sample 20 type (air, std, cal), inlet height, how much data is to be rejected and data averaging frequencies for each Valco valve port within the sample selection system. Data within the network is averaged over 1, 5,20 and 60-minute intervals, with time stamps corresponding to the beginning of the measurement, and •0 )-.…”

Section: Algorithms For Calculating Co 2 and Chmentioning

confidence: 99%

Greenhouse gas measurements from a UK network of tall towers: technical description and first results

Stanley¹,

Grant²,

O’Doherty³

et al. 2017

Preprint

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Abstract.A network of tall tower measurement stations was set up in 2012 across the United Kingdom to expand measurements made at the long-term background northern hemispheric site, Mace Head, 15Ireland. Reliable and precise in situ greenhouse gas (GHG) analysis systems were developed and deployed at three sites in the UK with automated custom-built instrumentation measuring a suite of GHGs. The UK Deriving Emissions linked to Climate Change (UK DECC) network uses tall (165 -230 m) open lattice telecommunications towers, which provide a convenient platform for boundary layer trace gas sampling. In this paper we describe the automated measurement system and first results from 20 the UK DECC network for CO 2 , CH 4 , N 2 O, SF 6 , CO and H 2 .CO 2 and CH 4 are measured at all of the UK DECC sites by cavity ring-down spectroscopy (CRDS) with multiple inlet heights at two of the three tall tower sites to assess for boundary layer stratification. The long-term 1-minute mean precisions (1s) of CRDS measurements at background mole fractions for January 2012 to September 2015 is < 0.03 µmol mol -1 for CO 2 and < 0.2 nmol mol -1 for CH 4 . N 2 O and 25 SF 6 are measured at three of the sites, and CO and H 2 measurements are made at two of the sites, from a single inlet height using gas chromatography (GC) with an electron capture detector (ECD) or reduction gas analyser (RGA). Repeatability of individual injections (1s) on GC and RGA instruments between Instrumentation in the network is fully automated and includes sensors for measuring a variety of instrumental parameters such as flow, pressures, and sampling temperatures. Automated alerts are 5 generated and emailed to site operators when instrumental parameters are not within defined set ranges.Automated instrument shutdowns occur for critical errors such as carrier gas flow rate deviations.Results from the network give good spatial and temporal coverage of atmospheric mixing ratios within the UK since early 2012. Results also show that all measured GHGs are increasing in mole fraction over the selected reporting period and, except for SF 6 , exhibit a seasonal trend. CO 2 and CH 4 also show 10 strong diurnal cycles, with night-time maxima and daytime minima in mole fractions. These data are used to produce independent emission estimates for comparison with the UK national inventory based on independent methods.

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Biogenic fluxes of halomethanes from Irish peatland ecosystems

Cited by 155 publications

References 48 publications

Is chloride a conservative ion in forest ecosystems?

Is chloride a conservative ion in forest ecosystems?

Production of methyl bromide in a temperate forest soil

Greenhouse gas measurements from a UK network of tall towers: technical description and first results

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