Figure 1
From: Evaluating methane inventories by isotopic analysis in the London region
Emission (a) and isotopic (b) map for London based on 2013 NAEI methane inventories. Emissions are provided in tonne/year/km2 (~3.2 · 10−11 kg/s/m2). The star indicates Egham, where the Royal Holloway University of London is located. King’s College London (KCL) and the borough of Hounslow are indicated. Most of the hotspots are associated with 13C-depleted areas. The large area affected by high emissions on the east side of the London region includes biogenic methane sources, such as landfill sites and waste-water treatment plants. The map was generated using ArcMap 10.2.
