TY - JOUR
T1 - A broadband cavity enhanced absorption spectrometer for aircraft measurements of glyoxal, methylglyoxal, nitrous acid, nitrogen dioxide, and water vapor
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, K.
AU - Rohrer, F.
AU - Zhang, Y.
AU - Brown, S. S.
N1 - Publisher Copyright:
© Author(s) 2016.
PY - 2016/2/11
Y1 - 2016/2/11
N2 - 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 (2 σ ) 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.
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 (2 σ ) 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.
UR - https://www.scopus.com/pages/publications/84958960895
U2 - 10.5194/amt-9-423-2016
DO - 10.5194/amt-9-423-2016
M3 - Article
AN - SCOPUS:84958960895
SN - 1867-1381
VL - 9
SP - 423
EP - 440
JO - Atmospheric Measurement Techniques
JF - Atmospheric Measurement Techniques
IS - 2
ER -