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In‐flight measurement of aircraft non‐methane hydrocarbon emission indices
Author(s) -
Slemr F.,
Giehl H.,
Slemr J.,
Busen R.,
Schulte P.,
Haschberger P.
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 - 10.1029/97gl03784
Subject(s) - methane , hydrocarbon , environmental science , fraction (chemistry) , atmospheric sciences , cracking , exhaust gas , fourier transform infrared spectroscopy , environmental chemistry , analytical chemistry (journal) , chemistry , geology , physics , organic chemistry , optics
Concentrations of non‐methane hydrocarbons (NMHC) and CO were measured in exhaust plumes of the DLR experimental aircraft ATTAS equipped with Rolls Royce M 45H Mk50l engines. The emission indices (EI) of individual light NMHC were determined from ratios of NMHC and CO concentration enhancements measured in grab samples and the concurrent in‐flight measurements of EI of CO by FTIR emission spectroscopy. Alkenes and alkynes generated by cracking of larger NMHC molecules and aromatic compounds originating from unburnt fuel constituted a larger and a smaller fraction of the NMHC emissions, respectively.