Measurement of tropospheric OH concentrations by laser long-path absorption spectroscopy

摘要: Tropospheric hydroxyl (OH) radical concentrations were measured in summer 1987 Jiilich by broadband laser long-path absorption (laser-LPA) spectroscopy observing the Q 1 (2), 2 (2).Q (3).Q (3). and P (1) rotational lines around 308 nm. The measurement technique was improved using a multichannel spectrometric detector to record OH spectra. Now much wider spectral interval can be observed at high resolution; thus, registration correction of overlapping features interfering trace gases is improved. Simultaneous measurements, nitrogen dioxide (NO ), formaldehyde (HCHO), sulfur (SO ) monitored second LPA spectrometer. Ozone (O 3 aerosol concentrations, meteorological parameters, absolutely calibrated photolysis frequencies O NO also recorded. Carbon monoxide (CO), methane (CH 4 light hydrocarbons determined gas chromatographic analysis. ranged up 6.8.10 6 molecules/cm . At one day July, an 'asymmetric' diurnal profile concentration observed, which could qualitatively explained strong decrease during morning hours. DOI: 10.1111/j.1600-0889.1988.tb00115.x