Abstract :
[en] Ethane is the most abundant non-methane hydrocarbon in Earth’s atmosphere and acts as
an indirect greenhouse gas, influencing the atmospheric lifetime of methane. Therefore,
understanding the development of trends and identifying trend reversals in atmospheric
ethane is crucial. Ethane abundance is measured at different ground-based stations world-
wide using Fourier transform infrared remote sensing techniques. We compile a new dataset comprising 26 ethane time series from the Northern and Southern Hemispheres. We
analyze their long-term trends using different econometric techniques capable of handling
missing data and strong seasonal components present in the data. The resulting trend pat-
terns are consistent across the different methods, with similar estimated trends at the various stations. In the Northern Hemisphere, the common trend across stations declined from the 1990s to 2005, gradually increased over the next decade, and then resumed a similar downward trajectory from 2015 onward. The estimated trends reveal a pronounced peak around 2014/2015, marking a reversal from an upward to a downward trend.
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