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Massive marine methane emissions from near-shore shallow coastal areas
Borges, A.V; Champenois, W.; Gypens, N.; Delille, B.; Harlay, J. (2016). Massive marine methane emissions from near-shore shallow coastal areas. NPG Scientific Reports 6(27908): 8 pp. https://dx.doi.org/10.1038/srep27908
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322; e-ISSN 2045-2322
Peer reviewed article  
Available in  Authors 
Keywords
    Cycles > Chemical cycles > Geochemical cycle > Biogeochemical cycle > Nutrient cycles > Carbon cycle
    Marine chemistry
    Marine/Coastal
Authors  Top 
  • Borges, A.V, more
  • Champenois, W.
  • Gypens, N.
  • Delille, B.
  • Harlay, J.
Abstract
    Methane is the second most important greenhouse gas contributing to climate warming. The open ocean is a minor source of methane to the atmosphere. We report intense methane emissions from the near-shore southern region of the North Sea characterized by the presence of extensive areas with gassy sediments. The average flux intensities (~130 µmol m-2 d-1) are one order of magnitude higher than values characteristic of continental shelves (~30µmol m-2 d-1) and three orders of magnitude higher than values characteristic of the open ocean (~0.4 µmol m-2 d-1). The high methane concentrations (up to 1,128 nmol L-1) that sustain these fluxes are related to the shallow and well-mixed water column that allows an efficient transfer of methane from the seafloor to surface waters. This differs from deeper and stratified seep areas where there is a large decrease of methane between bottom and surface by microbial oxidation or physical transport. Shallow well-mixed continental shelves represent about 33% of the total continental shelf area, so that marine coastal methane emissions are probably under-estimated. Near-shore and shallow seep areas are hot spots of methane emission, and our data also suggest that emissions could increase in response to warming of surface waters.
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