ESS11
Prof.
Jin-Yi Yu
Orbital-Scale Changes in Methane
qThe Vostok ice record shows a series of
cyclic variations
in methane concentration, ranging between 350 to 700 ppb (part
per billion).
qEach Ch4 cycle takes about 23,000
years.
Modern interglacial period
Last interglacial period
(from Earth’s Climate: Past and Future)