TY  - JOUR
AU  - Min, K.-E.
AU  - Washenfelder, R. A.
AU  - Dubé, W. P.
AU  - Langford, A. O.
AU  - Edwards, P. M.
AU  - Zarzana, K. J.
AU  - Stutz, J.
AU  - Lu, Keding
AU  - Rohrer, F.
AU  - Zhang, Y.
AU  - Brown, S. S.
TI  - A broadband cavity enhanced absorption spectrometer for aircraft measurements of glyoxal, methylglyoxal, nitrous acid, nitrogen dioxide, and water vapor
JO  - Atmospheric measurement techniques
VL  - 9
IS  - 2
SN  - 1867-8548
CY  - Katlenburg-Lindau
PB  - Copernicus
M1  - FZJ-2016-04188
SP  - 423 - 440
PY  - 2016
AB  - We describe a two-channel broadband cavity enhanced absorption spectrometer (BBCEAS) for aircraft measurements of glyoxal (CHOCHO), methylglyoxal (CH3COCHO), nitrous acid (HONO), nitrogen dioxide (NO2), and water (H2O). The instrument spans 361–389 and 438–468 nm, using two light-emitting diodes (LEDs) and a single grating spectrometer with a charge-coupled device (CCD) detector. Robust performance is achieved using a custom optical mounting system, high-power LEDs with electronic on/off modulation, high-reflectivity cavity mirrors, and materials that minimize analyte surface losses. We have successfully deployed this instrument during two aircraft and two ground-based field campaigns to date. The demonstrated precision (2σ) for retrievals of CHOCHO, HONO and NO2 are 34, 350, and 80 parts per trillion (pptv) in 5 s. The accuracy is 5.8, 9.0, and 5.0 %, limited mainly by the available absorption cross sections.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000375612000007
DO  - DOI:10.5194/amt-9-423-2016
UR  - https://juser.fz-juelich.de/record/811843
ER  -