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  • Saunois, M.University of Paris Saclay, France (författare)

Variability and quasi-decadal changes in the methane budget over the period 2000–2012

  • Artikel/kapitelEngelska2017

Förlag, utgivningsår, omfång ...

  • 2017-09-20
  • Copernicus GmbH,2017
  • electronicrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:su-148595
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-148595URI
  • https://doi.org/10.5194/acp-17-11135-2017DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-141711URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • Funding Agencies|EU FP7 GEOCARBON project; National Environmental Science Program - Earth Systems and Climate Change Hub; NASA [NNX07AK10G]; Swiss National Science Foundation; National Science and Engineering Research Council of Canada (NSERC) discovery grant; Chinas QianRen Program; Research Council of Norway project [209701]; Swedish Research Council VR; ERC [725546]; Environment Research and Technology Development Fund of the Ministry of the Environment, Japan [A2-1502]; Office of Science, Office of Biological and Environmental Research of the US Department of Energy as part of the RGCM BGC-Climate Feedbacks SFA [DE-AC02-05CH11231]; European Commission Seventh Framework Programme (FP7) project MACCII [283576]; European Commission Horizon Programme project MACC-III [633080]; ESA Climate Change Initiative Greenhouse Gases Phase 2 project; NASA Carbon Monitoring Program [NNX12AP84G, NNX14AO73G]; Joint DECC/Defra Met Office Hadley Centre Climate Programme [GA01101]; ERC Advanced grant (CDREG) [322998]; NERC [NE/J00748X/1]; CSIRO Australia; Australian Bureau of Meteorology; Australian Institute of Marine Science; Australian Antarctic Division; NOAA USA; Meteorological Service of Canada; National Aeronautic and Space Administration (NASA) [NAG5-12669, NNX07AE89G, NNX11AF17G, NNX07AE87G, NNX07AF09G, NNX11AF15G, NNX11AF16G]; Department of Energy and Climate Change (DECC, UK) [GA01081]; Commonwealth Scientific and Industrial Research Organisation (CSIRO Australia); Bureau of Meteorology (Australia)
  • Following the recent Global Carbon Project (GCP) synthesis of the decadal methane (CH4) budget over 2000–2012 (Saunois et al., 2016), we analyse here the same dataset with a focus on quasi-decadal and inter-annual variability in CH4 emissions. The GCP dataset integrates results from top-down studies (exploiting atmospheric observations within an atmospheric inverse-modelling framework) and bottom-up models (including process-based models for estimating land surface emissions and atmospheric chemistry), inventories of anthropogenic emissions, and data-driven approaches. The annual global methane emissions from top-down studies, which by construction match the observed methane growth rate within their uncertainties, all show an increase in total methane emissions over the period 2000–2012, but this increase is not linear over the 13 years. Despite differences between individual studies, the mean emission anomaly of the top-down ensemble shows no significant trend in total methane emissions over the period 2000–2006, during the plateau of atmospheric methane mole fractions, and also over the period 2008–2012, during the renewed atmospheric methane increase. However, the top-down ensemble mean produces an emission shift between 2006 and 2008, leading to 22 [16–32] Tg CH4 yr−1 higher methane emissions over the period 2008–2012 compared to 2002–2006. This emission increase mostly originated from the tropics, with a smaller contribution from mid-latitudes and no significant change from boreal regions. The regional contributions remain uncertain in top-down studies. Tropical South America and South and East Asia seem to contribute the most to the emission increase in the tropics. However, these two regions have only limited atmospheric measurements and remain therefore poorly constrained. The sectorial partitioning of this emission increase between the periods 2002–2006 and 2008–2012 differs from one atmospheric inversion study to another. However, all top-down studies suggest smaller changes in fossil fuel emissions (from oil, gas, and coal industries) compared to the mean of the bottom-up inventories included in this study. This difference is partly driven by a smaller emission change in China from the top-down studies compared to the estimate in the Emission Database for Global Atmospheric Research (EDGARv4.2) inventory, which should be revised to smaller values in a near future. We apply isotopic signatures to the emission changes estimated for individual studies based on five emission sectors and find that for six individual top-down studies (out of eight) the average isotopic signature of the emission changes is not consistent with the observed change in atmospheric 13CH4. However, the partitioning in emission change derived from the ensemble mean is consistent with this isotopic constraint. At the global scale, the top-down ensemble mean suggests that the dominant contribution to the resumed atmospheric CH4 growth after 2006 comes from microbial sources (more from agriculture and waste sectors than from natural wetlands), with an uncertain but smaller contribution from fossil CH4 emissions. In addition, a decrease in biomass burning emissions (in agreement with the biomass burning emission databases) makes the balance of sources consistent with atmospheric 13CH4 observations. In most of the top-down studies included here, OH concentrations are considered constant over the years (seasonal variations but without any inter-annual variability). As a result, the methane loss (in particular through OH oxidation) varies mainly through the change in methane concentrations and not its oxidants. For these reasons, changes in the methane loss could not be properly investigated in this study, although it may play a significant role in the recent atmospheric methane changes as briefly discussed at the end of the paper.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Bousquet, P.University of Paris Saclay, France (författare)
  • Poulter, B.NASA, MD 20771 USA (författare)
  • Peregon, A.University of Paris Saclay, France (författare)
  • Ciais, P.University of Paris Saclay, France (författare)
  • Canadell, J. G.CSIRO, Australia (författare)
  • Dlugokencky, E. J.NOAA, CO 80305 USA (författare)
  • Etiope, G.Ist Nazl Geofis and Vulcanol, Italy; Babes Bolyai University, Romania (författare)
  • Bastviken, DavidLinköpings universitet,Tema Miljöförändring,Filosofiska fakulteten(Swepub:liu)davba48 (författare)
  • Houweling, S.Netherlands Institute Space Research SRON, Netherlands; Institute Marine and Atmospher Research, Netherlands (författare)
  • Janssens-Maenhout, G.European Commiss Joint Research Centre, Italy (författare)
  • Tubiello, F. N.Food and Agriculture Org United Nations FAO, Italy (författare)
  • Castaldi, S.Seconda University of Napoli, Italy; FEFU, Russia; Euro Mediterranean Centre Climate Change, Italy (författare)
  • Jackson, R. B.Stanford University, CA 94305 USA (författare)
  • Alexe, M.European Commiss Joint Research Centre, Italy (författare)
  • Arora, V. K.Environm and Climate Change Canada, Canada (författare)
  • Beerling, D. J.University of Sheffield, England (författare)
  • Bergamaschi, P.European Commiss Joint Research Centre, Italy (författare)
  • Blake, D. R.University of Calif Irvine, CA 92697 USA (författare)
  • Brailsford, G.Nat Institute Water and Atmospher Research, New Zealand (författare)
  • Bruhwiler, L.NOAA, CO 80305 USA (författare)
  • Crevoisier, C.University of Paris Saclay, France (författare)
  • Crill, PatrickStockholms universitet,Institutionen för geologiska vetenskaper,Department Geol Science, Sweden; Bolin Centre Climate Research, Sweden(Swepub:su)pcril (författare)
  • Covey, K.Yale University, CT 06511 USA (författare)
  • Frankenberg, C.CALTECH, CA 91125 USA; Jet Prop Lab, CA 91109 USA (författare)
  • Gedney, N.Joint Centre Hydrometeorol Research, England (författare)
  • Höglund-Isaksson, L.IIASA, Austria (författare)
  • Ishizawa, M.National Institute Environm Studies, Japan (författare)
  • Ito, A.National Institute Environm Studies, Japan (författare)
  • Joos, F.University of Bern, Switzerland; University of Bern, Switzerland (författare)
  • Kim, H. -SNational Institute Environm Studies, Japan (författare)
  • Kleinen, T.Max Planck Institute Meteorol, Germany (författare)
  • Krummel, P.CSIRO, Australia,JAMSTEC, Japan; JAMSTEC, Japan (författare)
  • Lamarque, J. -FNCAR, CO 80307 USA (författare)
  • Langenfelds, R.CSIRO, Australia (författare)
  • Locatelli, R.University of Paris Saclay, France (författare)
  • Machida, T.National Institute Environm Studies, Japan (författare)
  • Maksyutov, S.National Institute Environm Studies, Japan (författare)
  • Melton, J. R.Environm and Climate Change Canada, Canada (författare)
  • Morino, I.National Institute Environm Studies, Japan (författare)
  • Naik, V.NOAA, NJ 08540 USA (författare)
  • O'Doherty, S.University of Bristol, England (författare)
  • Parmentier, F. -JW.UiT Arctic University of Norway, Norway (författare)
  • Patra, P. K. (författare)
  • Peng, C.University of Quebec, Canada; Northwest AandF University, Peoples R China (författare)
  • Peng, S.University of Paris Saclay, France; Peking University, Peoples R China (författare)
  • Peters, G. P.CICERO Centre Int Climate Research, Norway (författare)
  • Pison, I.University of Paris Saclay, France (författare)
  • Prinn, R.MIT, MA 02139 USA (författare)
  • Ramonet, M.University of Paris Saclay, France (författare)
  • Riley, W. J.Lawrence Berkeley National Lab, CA 94720 USA (författare)
  • Saito, M.National Institute Environm Studies, Japan (författare)
  • Santini, M.FEFU, Russia; Euro Mediterranean Centre Climate Change, Italy (författare)
  • Schroeder, R.University of New Hampshire, NH 03824 USA (författare)
  • Simpson, I. J.University of Calif Irvine, CA 92697 USA (författare)
  • Spahni, R.University of Bern, Switzerland; University of Bern, Switzerland (författare)
  • Takizawa, A.Japan Meteorol Agency, Japan (författare)
  • Thornton, Brett F.Stockholms universitet,Institutionen för geologiska vetenskaper,Department Geol Science, Sweden; Bolin Centre Climate Research, Sweden(Swepub:su)brtho (författare)
  • Tian, H.Auburn University, AL 36849 USA (författare)
  • Tohjima, Y.National Institute Environm Studies, Japan (författare)
  • Viovy, N.University of Paris Saclay, France (författare)
  • Voulgarakis, A.Imperial Coll London, England (författare)
  • Weiss, R.University of Calif San Diego, CA 92093 USA (författare)
  • Wilton, D. J.University of Sheffield, England (författare)
  • Wiltshire, A.Hadley Centre, England (författare)
  • Worthy, D.Environm Canada, Canada (författare)
  • Wunch, D.University of Toronto, Canada (författare)
  • Xu, X.Lawrence Berkeley National Lab, CA 94720 USA; Chinese Academic Science, Peoples R China (författare)
  • Yoshida, Y.National Institute Environm Studies, Japan (författare)
  • Zhang, B.Auburn University, AL 36849 USA (författare)
  • Zhang, Z.Swiss Federal Research Institute WSL, Switzerland (författare)
  • Zhu, Q.Northwest AandF University, Peoples R China (författare)
  • University of Paris Saclay, FranceNASA, MD 20771 USA (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Atmospheric Chemistry And Physics: Copernicus GmbH17:18, s. 11135-111611680-73161680-7324

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