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aganesan

Ozone-depleting substances from East Asia

We have now published a series of studies showing the release of ozone-depleting substances from East Asia. The substances we have studied are CFC-11, chloroform (CHCl3) and carbon tetrachloride (CCl4). Production of all of these. are banned under the Montreal Protocol. A study using measurements from NOAA “background” stations showed …

New process-model of soil methanotrophy of methane

We have created a new process-model of methane uptake by soil, based on a compilation of field measurements showed significant differences in methanotrophy rates in different ecosystems. Our model incorporates different microbial oxidation rate constants for different ecosystems and we find that the methanotrophy rates we derive are much more …

Spatially-resolved d13C-CH4 isotopic source signatures from wetlands

Based on measurements compiled from the past couple of decades on the wetland d13C-CH4 isotopic source signatures from different wetland ecosystems, we have produced a spatially-resolved gridded map. This map distinguishes bogs and fens in the northern high-latitudes, which have dramatically different signatures due to the fundamental differences in hydrology, …

Stable methane emissions from India

Our study has found that India’s methane emissions have been stable and were not rising between 2010 and 2015.  This is in contrast to other countries such as China, where emissions have risen due to increased fossil fuel emissions, or the United States, where emissions may in fact be falling. …

An alternative explanation for recent methane increases

Our new study, led by Matt Rigby, which has been published in the Proceedings of the National Academy of Sciences, demonstrates the role of methane oxidation by the hydroxyl radical to explain the post 2007 growth in atmospheric methane concentrations. Several recent studies have proposed a variety of mechanisms that could explain …

BBC Radio 4 Counting Carbon

Listen to the BBC Radio 4 documentary Counting Carbon.  In it, I am speaking along with other scientists about the problems associated with greenhouse gas reporting and the implications of this on climate agreements.  A write-up of the story is featured on the BBC.