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Atmospheric O 2 , CO 2 and δ 13 C measurements from aircraft sampling over Griffin Forest, Perthshire, UK
Author(s) -
Sturm Patrick,
Leuenberger Markus,
Moncrieff John,
Ramonet Michel
Publication year - 2005
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.2071
Subject(s) - atmospheric sciences , sampling (signal processing) , amplitude , chemistry , troposphere , biosphere , analytical chemistry (journal) , geology , environmental chemistry , physics , quantum mechanics , astronomy , detector , optics
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 O 2 /N 2 , CO 2 and δ 13 C of CO 2 . We sampled flasks between 800 and 3100 m above sea level. The peak‐to‐peak amplitude of the seasonal cycle of O 2 /N 2 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 CO 2 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 O 2 /N 2 ratios in summer and increasing O 2 /N 2 ratios in wintertime with increasing sampling height, due to surface exchange of oxygen with the land biosphere and the ocean. The O 2 :CO 2 exchange ratios of the vertical profiles vary between −1.5 and −2.4 mol O 2 /mol CO 2 . Copyright © 2005 John Wiley & Sons, Ltd.