Matches in SemOpenAlex for { <https://semopenalex.org/work/W1668805092> ?p ?o ?g. }
- W1668805092 endingPage "n/a" @default.
- W1668805092 startingPage "n/a" @default.
- W1668805092 abstract "[1] Subglacial environments are a previously neglected component of the Earth's global carbon cycle, a reflection of the view held until recently that they are dominated by abiotic and oxic conditions. Here we provide a realistic assessment of the theory that the basal regions of the ice sheets that formed over North America and Europe during glaciations were host to significant populations of anaerobic microorganisms, including methanogens, able to metabolize organic carbon sequestered during interglacials and overridden during Quaternary glacials. In doing so, we review the current evidence for subglacial methane release during deglaciation, estimate the size of the subglacial reservoir of organic carbon (SOC), and assess the amount of SOC available to subglacial microbes and the likely pathways and rates of carbon turnover. We then discuss the fate of subglacial methane and the potential impact of its release on atmospheric methane concentrations. We calculate that the SOC equates to 418–610 Pg C and includes carbon from terrestrial soils/vegetation, peatlands, lake, and marine sediments. The SOC that is potentially available for microbial conversion to methane is smaller than this estimate due to (1) glacial erosion, (2) accumulation of recalcitrant organic carbon compounds over time, (3) conversion to carbon dioxide by aerobic/anaerobic respiration, and (4) incomplete conversion of labile organic matter to methane. We estimate that the total SOC available for conversion to methane is 63 Pg C. Our estimates of methane production potentials span a wide range because of the current uncertainty surrounding subglacial metabolic rates. We believe, however, that there is a strong likelihood that subglacial microbes could convert 63 Pg of SOC to methane during a glacial cycle. If this were the case, release of this methane from the ice sheet margins during retreat would need to be episodic in order to significantly impact atmospheric methane concentrations. Our findings suggest that it may well be important to consider subglacial environments as active components of the Earth's carbon cycle. Conclusive determination of the potential impact of subglacial methane production on atmospheric methane concentrations during deglaciation, however, awaits more precise determination of the ability of subglacial microbes to degrade organic carbon components and their associated rates of metabolism under in situ conditions." @default.
- W1668805092 created "2016-06-24" @default.
- W1668805092 creator A5016499068 @default.
- W1668805092 creator A5026534185 @default.
- W1668805092 creator A5032544567 @default.
- W1668805092 creator A5079618038 @default.
- W1668805092 date "2008-06-01" @default.
- W1668805092 modified "2023-09-23" @default.
- W1668805092 title "Subglacial methanogenesis: A potential climatic amplifier?" @default.
- W1668805092 cites W1499068684 @default.
- W1668805092 cites W1537957428 @default.
- W1668805092 cites W1568068075 @default.
- W1668805092 cites W1600515466 @default.
- W1668805092 cites W1657540667 @default.
- W1668805092 cites W1679627203 @default.
- W1668805092 cites W1965578568 @default.
- W1668805092 cites W1965909841 @default.
- W1668805092 cites W1966282214 @default.
- W1668805092 cites W1967797417 @default.
- W1668805092 cites W1972602760 @default.
- W1668805092 cites W1973332823 @default.
- W1668805092 cites W1978807041 @default.
- W1668805092 cites W1980056213 @default.
- W1668805092 cites W1980508708 @default.
- W1668805092 cites W1981430608 @default.
- W1668805092 cites W1981457107 @default.
- W1668805092 cites W1983704163 @default.
- W1668805092 cites W1985718937 @default.
- W1668805092 cites W1990571595 @default.
- W1668805092 cites W1994617442 @default.
- W1668805092 cites W1994908588 @default.
- W1668805092 cites W1998434122 @default.
- W1668805092 cites W1999651170 @default.
- W1668805092 cites W1999995018 @default.
- W1668805092 cites W2007181472 @default.
- W1668805092 cites W2007533608 @default.
- W1668805092 cites W2008078993 @default.
- W1668805092 cites W2008084253 @default.
- W1668805092 cites W2008262498 @default.
- W1668805092 cites W2014001225 @default.
- W1668805092 cites W2016042415 @default.
- W1668805092 cites W2017996711 @default.
- W1668805092 cites W2019928287 @default.
- W1668805092 cites W2020736988 @default.
- W1668805092 cites W2022872047 @default.
- W1668805092 cites W2023906603 @default.
- W1668805092 cites W2024943381 @default.
- W1668805092 cites W2026838234 @default.
- W1668805092 cites W2028080961 @default.
- W1668805092 cites W2031133678 @default.
- W1668805092 cites W2032854853 @default.
- W1668805092 cites W2033076060 @default.
- W1668805092 cites W2034693675 @default.
- W1668805092 cites W2038207799 @default.
- W1668805092 cites W2040650584 @default.
- W1668805092 cites W2040924828 @default.
- W1668805092 cites W2047443614 @default.
- W1668805092 cites W2049830390 @default.
- W1668805092 cites W2050191480 @default.
- W1668805092 cites W2056628980 @default.
- W1668805092 cites W2057782739 @default.
- W1668805092 cites W2059235535 @default.
- W1668805092 cites W2059332307 @default.
- W1668805092 cites W2059644158 @default.
- W1668805092 cites W2060542124 @default.
- W1668805092 cites W2068589879 @default.
- W1668805092 cites W2069240596 @default.
- W1668805092 cites W2070789922 @default.
- W1668805092 cites W2074330734 @default.
- W1668805092 cites W2079430132 @default.
- W1668805092 cites W2079572211 @default.
- W1668805092 cites W2080740049 @default.
- W1668805092 cites W2081455374 @default.
- W1668805092 cites W2083181298 @default.
- W1668805092 cites W2089679687 @default.
- W1668805092 cites W2096510407 @default.
- W1668805092 cites W2099667979 @default.
- W1668805092 cites W2104833230 @default.
- W1668805092 cites W2104913197 @default.
- W1668805092 cites W2108732658 @default.
- W1668805092 cites W2110573800 @default.
- W1668805092 cites W2110795813 @default.
- W1668805092 cites W2111880928 @default.
- W1668805092 cites W2113093635 @default.
- W1668805092 cites W2117057715 @default.
- W1668805092 cites W2120918440 @default.
- W1668805092 cites W2121608922 @default.
- W1668805092 cites W2122659775 @default.
- W1668805092 cites W2124222671 @default.
- W1668805092 cites W2124838604 @default.
- W1668805092 cites W2128598622 @default.
- W1668805092 cites W2129753579 @default.
- W1668805092 cites W2130271104 @default.
- W1668805092 cites W2131210377 @default.
- W1668805092 cites W2137675088 @default.
- W1668805092 cites W2139432134 @default.
- W1668805092 cites W2140206158 @default.
- W1668805092 cites W2146450953 @default.