Figure 3
From: Evaluating methane inventories by isotopic analysis in the London region
δ13C source signature rose for the KCL site for all diurnal campaigns between 2nd December 2013 and 8th August 2014, plotted using OpenAir software. The plot includes all episodes with maximum methane mole fractions at least 100 ppb higher than the background, associated with recorded wind directions (wind speed >0 m s−1). Map data: Google, DigitalGlobe.
