Microseepage in drylands: Flux and implications in the global atmospheric source/sink budget of methane

Etiope, Giuseppe; Klusman, Ronald W.

doi:10.1016/j.gloplacha.2010.01.002

Cited by 108 publications

(96 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Digital global maps that would be needed to construct gridded global emissions for use in models do not exist or are not made available for commercial reasons. This is true in particular for micro seepage from sedimentary basins on land, with an estimated global contribution exceeding 10 Tg CH 4 yr −1 and covering 10 % of the global drylands (Etiope and Klusman, 2010). For this reason, we account only for 1300 mud volcanoes and seeps that are reported worldwide and are archived in the GLOGOS database (http://www.searchanddiscovery.…”

Section: A Priori Fluxesmentioning

confidence: 99%

A multi-year methane inversion using SCIAMACHY, accounting for systematic errors using TCCON measurements

et al. 2014

View full text Add to dashboard Cite

Abstract. This study investigates the use of total column CH 4 (XCH 4 ) retrievals from the SCIAMACHY satellite instrument for quantifying large-scale emissions of methane. A unique data set from SCIAMACHY is available spanning almost a decade of measurements, covering a period when the global CH 4 growth rate showed a marked transition from stable to increasing mixing ratios. The TM5 4DVAR inverse modelling system has been used to infer CH 4 emissions from a combination of satellite and surface measurements for the period 2003-2010. In contrast to earlier inverse modelling studies, the SCIAMACHY retrievals have been corrected for systematic errors using the TCCON network of ground-based Fourier transform spectrometers. The aim is to further investigate the role of bias correction of satellite data in inversions. Methods for bias correction are discussed, and the sensitivity of the optimized emissions to alternative bias correction functions is quantified. It is found that the use of SCIAMACHY retrievals in TM5 4DVAR increases the estimated inter-annual variability of large-scale fluxes by 22 % compared with the use of only surface observations. The difference in global methane emissions between 2-year periods before and after July 2006 is estimated at 27-35 Tg yr −1 . The use of SCIAMACHY retrievals causes a shift in the emissions from the extra-tropics to the tropics of 50 ± 25 Tg yr −1 . The large uncertainty in this value arises from the uncertainty in the bias correction functions. Using measurements from the HIPPO and BARCA aircraft campaigns, we show that systematic errors in the SCIAMACHY measurements are a main factor limiting the performance of the inversions. To further constrain tropical emissions of methane using current and future satellite missions, extended validation capabilities in the tropics are of critical importance.Published by Copernicus Publications on behalf of the European Geosciences Union.

show abstract

Section: A Priori Fluxesmentioning

confidence: 99%

A multi-year methane inversion using SCIAMACHY, accounting for systematic errors using TCCON measurements

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Gases with more than 5.2 mg S m -3 sulfides are said to be sour, so these are removed during processing. It is important that gas has an odour to allow leaks to be detected, so additives such as EtSH, tetrahydrothiophene and t-butanethiol are commonly used, although they can be a problem in some industrial applications, so they may need to be removed ( Global emission from the micro-seepage of methane has been estimated to exceed 10 Tg a -1 (Etiope and Klusman, 2010). Assuming gas composition with H 2 S/OCS of 450 (Tu et al, 2010), H 2 S/CH 4 of 0.031 (NGO, 2004(NGO, -2011 and H 2 S/organic sulfur of 50, places the global microseepage of organic sulfur as 6.2 Gg S a -1 and OCS at 0.7 Gg S a -1 .…”

Section: Gas Industrymentioning

confidence: 99%

Anthropogenic contributions to global carbonyl sulfide, carbon disulfide and organosulfides fluxes

Lee

Brimblecombe

2016

Earth-Science Reviews

View full text Add to dashboard Cite

Previous studies of the global sulfur cycle have focused almost exclusively on oxidized species and just a few sulfides. This focus is expanded here to include a wider range of reduced sulfur compounds. Inorganic sulfides tend to be bound into sediments, and sulfates are present both in sediments and the oceans. Sulfur can adopt polymeric forms that include S-S bonds. This review examines the global anthropogenic sources of reduced sulfur, updating emission inventories and widening the consideration of industrial sources. It estimates the anthropogenic fluxes of key sulfides to the atmosphere (units Gg S

show abstract

“…A spectacular natural release, containing methane and 35% (v/v) ethane and propane 7 , results in the 'eternal flame' in Chestnut Ridge Park, New York. Widespread seepage, which is largely undocumented, also occurs in terrestrial areas that overlay sedimentary organic carbon 8 . The natural geological methane source, including terrestrial macro-seeps and micro-seeps, marine seeps and volcanic and geothermal emissions, is the second largest natural source after wetlands.…”

mentioning

confidence: 99%

“…The natural geological methane source, including terrestrial macro-seeps and micro-seeps, marine seeps and volcanic and geothermal emissions, is the second largest natural source after wetlands. Micro-seeps, which are potentially active in substantial areas (including petroliferous regions and sedimentary basins where thermal degradation of organic material has occurred), contribute 10-25 Tg methane annually 8 . This thermogenic natural gas contains methane and up to 50% (w/w) ethane, propane and butane 1,2 .…”

mentioning

confidence: 99%

Trace-gas metabolic versatility of the facultative methanotroph Methylocella silvestris

Crombie

Murrell

2014

Nature

View full text Add to dashboard Cite

Microseepage in drylands: Flux and implications in the global atmospheric source/sink budget of methane

Cited by 108 publications

References 40 publications

A multi-year methane inversion using SCIAMACHY, accounting for systematic errors using TCCON measurements

A multi-year methane inversion using SCIAMACHY, accounting for systematic errors using TCCON measurements

Anthropogenic contributions to global carbonyl sulfide, carbon disulfide and organosulfides fluxes

Trace-gas metabolic versatility of the facultative methanotroph Methylocella silvestris

Contact Info

Product

Resources

About