Understanding and quantifying the global methane (CH 4) budget is important for assessing
realistic pathways to mitigate climate change. Atmospheric emissions and concentrations of …

The global methane (CH 4) budget is becoming an increasingly important component for
managing realistic pathways to mitigate climate change. This relevance, due to a shorter …

It is unequivocal that the increases in atmospheric carbon dioxide (CO2), methane (CH4)
and nitrous oxide (N2O) since the pre-industrial period are caused by human activities. The …

The hydroxyl radical (• OH) is one of the most powerful oxidizing agents, able to react
unselectively and instantaneously with the surrounding chemicals, including organic …

Atmospheric methane plays a major role in controlling climate, yet contemporary methane
trends (1982–2017) have defied explanation with numerous, often conflicting, hypotheses …

From 2007 to 2013, the globally averaged mole fraction of methane in the atmosphere
increased by 5.7±1.2 ppb yr− 1. Simultaneously, δ13CCH4 (a measure of the 13C/12C …

The growth in global methane (CH4) concentration, which had been ongoing since the
industrial revolution, stalled around the year 2000 before resuming globally in 2007. We …

The self-cleaning or oxidation capacity of the atmosphere is principally controlled by
hydroxyl (OH) radicals in the troposphere. Hydroxyl has primary (P) and secondary (S) …

Methane is the second strongest anthropogenic greenhouse gas and its atmospheric
burden has more than doubled since 1850. Methane concentrations stabilized in the early …

We present the organization, instrumentation, datasets, data interpretation, modeling, and
accomplishments of the multinational global atmospheric measurement program AGAGE …