The distribution of methane on the Siberian Arctic shelves

Implications for the marine methane cycle

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The seepage of methane (CH4) through the seabed of the world's shelves is considered to be ubiquitous. Although numerous observations of methane seepages from shallow marine sources have been reported, there were only a very few observations made over the Arctic shelves and none for the East-Siberian Sea (ESS) or Laptev Sea (LS). We present two years of data obtained during the late summer period (September 2003 and September 2004) for both the ESS and LS shelves. According to our data, the surface layer of shelf water was supersaturated up to 2500% relative to the present average atmospheric methane content of 1.85 ppm. Anomalously high concentrations (up to 154 nM or 4400% supersaturation) of dissolved methane in the bottom layer of shelf water suggest that the bottom layer is somehow affected by near-bottom sources. Considering the possible formation mechanisms of such plumes, we favor thermo-abrasion and the effects of shallow gas or gas hydrates release.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalGeophysical Research Letters
Volume32
Issue number9
DOIs
Publication statusPublished - 16 May 2005
Externally publishedYes

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shelves
methane
cycles
seepage
shelf sea
gas hydrate
supersaturation
formation mechanism
abrasion
surface layer
gases
plume
hydrates
water
summer
plumes
surface layers
distribution
gas
sea

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

The distribution of methane on the Siberian Arctic shelves : Implications for the marine methane cycle. / Shakhova, Natalia; Semiletov, Igor; Panteleev, Gleb.

In: Geophysical Research Letters, Vol. 32, No. 9, 16.05.2005, p. 1-4.

Research output: Contribution to journalArticle

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