The KORUS-AQ website is undergoing a major upgrade that began Friday, October 11th at 5:00 PM PDT. The new upgraded site will be available no later than Monday, October 21st. Until that time, the current site will be visible but logins are disabled.

KORUS-AQ

NCAR NO-NO2 (NO-NO2)

Status

Operated By:

The upper box is the data acquisition and control system, including power
supplies. The middle box is the main instrument module with 2 channels of
detection, and the lowest box houses two ozonizers.

This is a 2-channel instrument based on the chemiluminescence detection of NO via reaction with O3 to form excited NO2, which is detected via photon counting. One sample channel is used to measure nitric oxide, NO, and the second measures nitrogen dioxide, NO2, by flowing ambient air through a glass cell illuminated by light-emitting diodes at 395 nm, for the conversion of NO2 to NO via photolysis. The instrument is similar to instruments previously built at NCAR [Ridley and Grahek, 1990; Ridley et al., 2004]. In the UTLS region, NOx (= NO + NO2) is mostly in the form of NO and is formed in situ by lightning, is emitted by aircraft, and may be transported to the UTLS from the boundary layer by convection.

Instrument Type:

Chemiluminescence

Measurements:

NO, NO2

Aircraft:

Gulfstream V - NSF

Point(s) of Contact:

Andrew Weinheimer (POC; PI), Steve Gabbard (Co-I), Denise D. Montzka (Co-I), Steve Shertz (Co-I), Geoffrey Tyndall (Co-I), Frank Flocke (Co-I)

Additional Information

Publications:

Ridley, B., and F. E. Grahek (1990), A small, low flow, high-sensitivity reaction vessel for NO chemiluminescence detectors, J. Atmos. Oceanic Technol., 7, 307-311.

Ridley, B., et al. (2004), Florida thunderstorms: A faucet of reactive nitrogen to the upper troposphere, J. Geophys. Res., 109, D17305, doi:10.1029/2004JD004769.