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Seasonal total methane depletion in limestone caves.
Waring, Chris L; Hankin, Stuart I; Griffith, David W T; Kertesz, Michael A; Kobylski, Victoria; Wilson, Neil L; Coleman, Nicholas V; Kettlewell, Graham; Zlot, Robert; Bosse, Michael; Bell, Graham.
Afiliación
  • Waring CL; ANSTO Environmental Research, New Illawarra Rd., Lucas Heights, NSW 2234, Australia. clw@ansto.gov.au.
  • Hankin SI; ANSTO Environmental Research, New Illawarra Rd., Lucas Heights, NSW 2234, Australia.
  • Griffith DWT; University of Wollongong, Centre for Atmospheric Chemistry, Wollongong, NSW 2522, Australia.
  • Kertesz MA; University of Sydney, Sydney Institute of Agriculture, Sydney, 2006, Australia.
  • Kobylski V; University of Sydney, Sydney Institute of Agriculture, Sydney, 2006, Australia.
  • Wilson NL; University of Sydney, Sydney Institute of Agriculture, Sydney, 2006, Australia.
  • Coleman NV; University of Sydney, School of Life and Environmental Sciences, Sydney, 2006, Australia.
  • Kettlewell G; University of Wollongong, Centre for Atmospheric Chemistry, Wollongong, NSW 2522, Australia.
  • Zlot R; formerly CSIRO, Technology Court, Pullenvale, QLD 4069, Australia.
  • Bosse M; formerly CSIRO, Technology Court, Pullenvale, QLD 4069, Australia.
  • Bell G; formerly CSIRO, Technology Court, Pullenvale, QLD 4069, Australia.
Sci Rep ; 7(1): 8314, 2017 08 16.
Article en En | MEDLINE | ID: mdl-28814720
Methane concentration in caves is commonly much lower than the external atmosphere, yet the cave CH4 depletion causal mechanism is contested and dynamic links to external diurnal and seasonal temperature cycles unknown. Here, we report a continuous 3-year record of cave methane and other trace gases in Jenolan Caves, Australia which shows a seasonal cycle of extreme CH4 depletion, from ambient ~1,775 ppb to near zero during summer and to ~800 ppb in winter. Methanotrophic bacteria, some newly-discovered, rapidly consume methane on cave surfaces and in external karst soils with lifetimes in the cave of a few hours. Extreme bacterial selection due to the absence of alternate carbon sources for growth in the cave environment has resulted in an extremely high proportion 2-12% of methanotrophs in the total bacteria present. Unexpected seasonal bias in our cave CH4 depletion record is explained by a three-step process involving methanotrophy in aerobic karst soil above the cave, summer transport of soil-gas into the cave through epikarst, followed by further cave CH4 depletion. Disentangling cause and effect of cave gas variations by tracing sources and sinks has identified seasonal speleothem growth bias, with implied palaeo-climate record bias.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2017 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2017 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Reino Unido