Fig. 10From: Investigating regional source and sink patterns of Alpine CO2 and CH4 concentrations based on a back trajectory receptor modelCombined concentration weighted trajectory field quantifying the influence of source and relative sink areas to the de-seasonalised and de-trended CH4 concentrations (in ppb) at the high-alpine receptor sites Jungfraujoch (JFJ), Plateau Rosa (PRO), Sonnblick (SOB) and Schneefernerhaus (UFS) over the entire study period 2011–2015Back to article page