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17 O/ 16 O and 18 O/ 16 O isotope measurements of atmospheric carbon monoxide and its sources
Author(s) -
Huff Amy K.,
Thiemens Mark H.
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl02603
Subject(s) - carbon monoxide , analytical chemistry (journal) , compounds of carbon , isotope , isotopes of carbon , carbon oxide , chemistry , radiochemistry , environmental chemistry , physics , chemical reaction , nuclear physics , biochemistry , catalysis
Simultaneous 17 O/ 16 O and 18 O/ 16 O measurements of atmospheric carbon monoxide (CO) and two of its major sources are presented. CO was collected in situ at ground level in La Jolla, CA, Pasadena, CA and White Mountain, CA, altitude 3.8 km. Samples were also taken directly from engine exhaust and during a local wild brushfire. Results indicate that atmospheric carbon monoxide has a significant mass independent component, which increases as carbon monoxide concentrations decrease. The origin of the observed mass independent fractionation is discussed. CO samples from engine exhaust and brushfires are clearly mass dependent, but with a wide variation in 18 O values from different engines.