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Biogeochemical Cycles (The Anaerobic Oxidation of Methane in Marine…
Biogeochemical Cycles
The Anaerobic Oxidation of Methane in Marine Sediments
Methane Cycles
mostly from
wetlands
volcanoes
seafloor
permafrosts
problems connected
heat trapping
global warming
CH4 concentrations
300-700 ppb in 600 thousand years
1700 ppb in summer 2014
Earth’s methane has tripled
methane is generated in but does not escape from marine sediments
distributions of carbon isotope abundances of organic components
controls on microorganisms responsible for methane oxidation
Reconstructing Past Carbon Dioxide Levels
Carbon Cycles
mostly from
volcanoes
decaying organic matter
respiration
problems connected
harm to health
global warming
CO2 concentrations
190-280 ppm in the last 300 thousand years
400 ppm in summer 2014
stable carbon isotopes
carbon 12
carbon 13
using
lipids
from
algae
bacteria
biomarkers
People Responsible for this Report
Alanza
Gershon Carlo
Alindato
Francis Dominic