TY  - JOUR
AU  - Varma, R.M.
AU  - Venables, D.S.
AU  - Ruth, A.A.
AU  - Heimann, U.
AU  - Schlosser, E.
AU  - Dixneuf, S.
TI  - Long optical cavities for open-path monitoring of atmospheric trace gases and aerosol extinction
JO  - Applied optics
VL  - 48
SN  - 0003-6935
CY  - Washington, DC
PB  - Optical Soc. of America
M1  - PreJuSER-3188
SP  - B159 - B171
PY  - 2009
N1  - Record converted from VDB: 12.11.2012
AB  - An incoherent broadband cavity-enhanced absorption spectroscopy setup employing a 20 m long optical cavity is described for sensitive in situ measurements of light extinction between 630 and 690 nm. The setup was installed at the SAPHIR atmospheric simulation chamber during an intercomparison of instruments for nitrate (NO3) radical detection. The long cavity was stable for the entire duration of the two week campaign. A detection limit of similar to 2 pptv for NO3 in an acquisition time of 5 s was established during that time. In addition to monitoring NO3, nitrogen dioxide (NO2) concentrations were simultaneously retrieved and compared against concurrent measurements by a chemiluminescence detector. Some results from the campaign are presented to demonstrate the performance of the instrument in an atmosphere containing water vapor and inorganic aerosol. The spectral analysis of NO3 and NO2, the concentration dependence of the water absorption cross sections, and the retrieval of aerosol extinction are discussed. The first deployment of the setup in the field is also briefly described. (C) 2009 Optical Society of America
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000264413400022
DO  - DOI:10.1364/AO.48.00B159
UR  - https://juser.fz-juelich.de/record/3188
ER  -