HR: 1340h
AN: A53C-0915    [Abstracts]
TI: An Aircraft Instrument for Simultaneous, In-situ Measurement of NO3 and N2O5 via Cavity Ring-down Spectroscopy
AU: * Dube, W P
EM: bdube@al.noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL2 325 Broadway, Boulder, CO 80305 United States
AU: * Dube, W P
EM: bdube@al.noaa.gov
AF: CIRES, University of Colorado at Boulder, Boulder, CO 80309
AU: Brown, S S
EM: Steven.S.Brown@noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL2 325 Broadway, Boulder, CO 80305 United States
AU: Brown, S S
EM: Steven.S.Brown@noaa.gov
AF: CIRES, University of Colorado at Boulder, Boulder, CO 80309
AU: Ciciora, S J
EM: sciciora@al.noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL2 325 Broadway, Boulder, CO 80305 United States
AU: Ostoff, H
EM: hosthoff@al.noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL2 325 Broadway, Boulder, CO 80305 United States
AU: Ostoff, H
EM: hosthoff@al.noaa.gov
AF: CIRES, University of Colorado at Boulder, Boulder, CO 80309
AU: Ravishankara, A R
EM: A.R.Ravishankara@noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL2 325 Broadway, Boulder, CO 80305 United States
AU: Paris, M
EM: mparis@mailsrvr.al.noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL2 325 Broadway, Boulder, CO 80305 United States
AU: McLaughlin, R
EM: rich@al.noaa.gov
AF: NOAA Aeronomy Laboratory, R/AL2 325 Broadway, Boulder, CO 80305 United States
AB: This paper describes a cavity ring-down spectrometer (CaRDS) specifically designed and constructed for installation on the NOAA WP-3 aircraft for in situ measurement of NO3 and N2O5 as part of the ICARTT 2004 campaign. While similar to our previous previously described CaRDS instrument (Brown et al, 2002), significant improvements were implemented to improve the signal-to-noise ratio, the time resolution, and the inlet transmission efficiency of the measurement system. Moreover, drastic reductions in overall size and weight were achieved to meet the requirements for installation on the aircraft. An inlet suitable for use with an aircraft was installed. This paper describes the specifics of these design changes and the resultant improvements in the measurement. Also presented are sample flight data taken with the new instrument. Additionally, this paper briefly describes a sealed automated filter changer that was designed and constructed to remove particulate matter in the airflow while having minimal loss of NO3 and N2O5. This filter changer, along with other improvements, allowed autonomous operation during the lengthy aircraft flights.
DE: 0317 Chemical kinetic and photochemical properties
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting