Seasonal total methane depletion in limestone caves.

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 Rep

journal_title

Scientific reports

authors

Waring CL,Hankin SI,Griffith DWT,Kertesz MA,Kobylski V,Wilson NL,Coleman NV,Kettlewell G,Zlot R,Bosse M,Bell G

doi

10.1038/s41598-017-07769-6

subject

Has Abstract

pub_date

2017-08-16 00:00:00

pages

8314

issue

1

issn

2045-2322

pii

10.1038/s41598-017-07769-6

journal_volume

7

pub_type

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