Abstract
A chemiluminescence analyzer was used to measure NOx mixing ratios at the west coast of Ireland. Two measurement modes allowed the determination of NO and NOx = NO + NO2. In a third mode using a molybdenum converter, higher signals were observed than was in the second mode indicating that nitrogen compounds other than NO + NO2 are registered. They are denoted ‘excess NOx.’ The average NO2 mixing ratio for a 3 week period was 101±87 pptv. In pure marine air masses identified by means of trajectory calculations, the NO2 mixing ratios were lower and exhibited in addition a diurnal variation with nighttime values of 37±6 pptv and average values of 87±47 pptv. Possible origins of the diurnal variation are discussed. For such conditions, the NO mixing ratio generally was immeasurably small, certainly less than 10 pptv. The excess NOx is also higher during the day compared with nighttime values of about 70 pptv. Further studies are required to identify the compounds involved.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
