Abstract
The high selectivity and freedom from interferences makes Tunable Diode Laser Absorption Spectrometry (TDLAS) an ideal standard reference method against which other techniques for measuring trace gases in the atmosphere can be compared. Examples are given of comparisons of TDLAS measurements with less definitive methods such as chemiluminescence, fluorometric, filter packs, denuders, transition flow reactors and other techniques which clearly demonstrate the conditions under which they may be used with confidence. In addition, good agreement is found between measurements made by TDLAS and other spectroscopic methods such as laser induced fluorescence and the less selective and less sensitive fourier transform infrared spectroscopy (FTIR) and differential optical absorption spectroscopy (DOAS). These intercomparisons were made over a wide variety of environmental conditions ranging from the clean air in and above the boundary layer of the Pacific, through moderately polluted rural air to the highly polluted urban troposphere.
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