Atmospheric O2, CO2 and δ13C measurements from aircraft sampling over Griffin Forest, Perthshire, UK

Sturm, Patrick; Leuenberger, Markus; Moncrieff, John; Ramonet, Michel (2005). Atmospheric O2, CO2 and δ13C measurements from aircraft sampling over Griffin Forest, Perthshire, UK. Rapid communications in mass spectrometry, 19(17), pp. 2399-2406. Wiley 10.1002/rcm.2071

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Regular vertical aircraft sampling has been performed in the lower troposphere above Griffin Forest, near Aberfeldy, Perthshire, UK (56°37′N, 3°47′W), between February 2003 and May 2004, for analysis of O2/N2, CO2 and δ13C of CO2. We sampled flasks between 800 and 3100 m above sea level. The peak-to-peak amplitude of the seasonal cycle of O2/N2 decreases from 171 per meg at 800 m to 113 per meg at 3100 m. Furthermore, the seasonal cycle is shifted from low to high altitudes with a lag of about 1 month. The same features are observed for CO2 with a decrease in the peak-to-peak amplitude of the seasonal cycle from 17.6 ppm at 800 m to 11.4 ppm at 3100 m. The vertical profiles show decreasing O2/N2 ratios in summer and increasing O2/N2 ratios in wintertime with increasing sampling height, due to surface exchange of oxygen with the land biosphere and the ocean. The O2:CO2 exchange ratios of the vertical profiles vary between −1.5 and −2.4 mol O2/mol CO2.

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