Fig. 8From: Investigating regional source and sink patterns of Alpine CO2 and CH4 concentrations based on a back trajectory receptor modelConcentration weighted trajectory fields quantifying the yearly influence of source and relative sink areas to the de-seasonalised and de-trended CO2 concentrations (in ppm) 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