Abstract:
: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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Waring CL,Hankin SI,Griffith DWT,Kertesz MA,Kobylski V,Wilson NL,Coleman NV,Kettlewell G,Zlot R,Bosse M,Bell Gdoi
10.1038/s41598-017-07769-6subject
Has Abstractpub_date
2017-08-16 00:00:00pages
8314issue
1issn
2045-2322pii
10.1038/s41598-017-07769-6journal_volume
7pub_type
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