Recently released data by the National Oceanic and Atmospheric Administration show that year-on-year growth in global atmospheric methane concentrations is now the largest since intensive measurements began in 1983. Methane has been rising rapidly in the atmosphere since 2007. The acceleration over the last decade, including the observed surge in …
In our recent study published in Atmospheric Chemistry and Physics, we used data from the GOSAT satellite to quantify emissions of methane from Brazil between 2010-2018. Because of the distinct separation of sources in Brazil (i.e., wetlands are generally not co-located with human-made emissions from agriculture), we partitioned total methane …
Our recent study shows how marine emissions of the potent greenhouse gas, nitrous oxide, can be detected in atmospheric concentration measurements from coastal towers. Our work, published in Geophysical Research Letters, looks at nitrous oxide emissions from the “hotspot” Eastern Boundary Upwelling Systems (EBUS) on western North America (California upwelling …
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Based on measurements we collected on the UK’s research aircraft in 2016, we have derived the first regional inverse modeling based estimates from India (Say et al., 2019). We show that CFCs are not in widespread use and there is a mix of HFC and HCFC usage, which is expected …
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 …
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 …
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, …
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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. …