Tropospheric Chemistry: Instruments

ARNOLD on aircraft

ARNOLD deployed on NOAA WP-3D aircraft.

ARNOLD (Atmospheric Ring-down Nitrogen Oxide Laser Detector)

Principle of the Measurement

pulsed cavity ring down

Species Measured

NO2, NO3, N2O5

Time Response

1 second

Detection Limit

0.1 ppbv NO2, 0.2 pptv NO3, 1 pptv N2O5


custom built

Field Projects

  • ICARTT 2004
  • Mesa 2005
  • TexAQS 2006
  • NO3/N2O5 Comp Julich 2007
  • Erie 2007, ICEALOT 2008
  • ACCRONIM 2009
  • CalNex 2010


Steve Brown / Bill Dubé

Key Publications

Dubé, W. P., S. S. Brown, H. D. Osthoff, M. R. Nunley, S. J. Ciciora, M. W. Paris, R. J. McLaughlin, and A. R. Ravishankara, Aircraft instrument for simultaneous, in-situ measurements of NO3 and N2O5 via cavity ring-down spectroscopy, Rev. Sci. Instr., 77, 034101, doi:10.1063/1061.2176058, 2006.

Fuchs, H., W. P. Dubé, S. J. Ciciora, and S. S. Brown, Determination of Inlet Transmission and Conversion Efficiencies for in Situ Measurements of the Nocturnal Nitrogen Oxides, NO3, N2O5 and NO2, via Pulsed Cavity Ring-Down Spectroscopy, Anal. Chem., 80, 6010-6017, doi:10.1021/ac8007253, 2008.