Supplement of Instrument inter-comparison of glyoxal, methyl glyoxal and NO2 under simulated atmospheric conditions
نویسنده
چکیده
منابع مشابه
Measurements of diurnal variations and eddy covariance (EC) fluxes of glyoxal in the tropical marine boundary layer: description of the Fast LED-CE-DOAS instrument
Here we present first eddy covariance (EC) measurements of fluxes of glyoxal, the smallest α-dicarbonyl product of hydrocarbon oxidation, and a precursor for secondary organic aerosol (SOA). The unique physical and chemical properties of glyoxal – i.e., high solubility in water (effective Henry’s law constant, KH = 4.2× 105 M atm−1) and short atmospheric lifetime (∼ 2 h at solar noon) – make it...
متن کاملMeasurement of isotope shifts in C12 and C13 glyoxal absorption at visible wavelengths, and first application to DOAS retrievals
Glyoxal (CHOCHO) is an atmospheric trace gas produced by the radical-initiated oxidation of hydrocarbons. High resolution measurements of the glyoxal absorption spectrum in the visible wavelength range are needed as reference spectra to calibrate optical spectroscopic measurements of this gas. The UV-vis absorption spectra of C13-disubstituted glyoxal and ambient (C12) glyoxal were collected at...
متن کاملGlyoxal retrieval from the Ozone Monitoring Instrument
We present an algorithm for the retrieval of glyoxal from backscattered solar radiation, and apply it to spectra measured by the Ozone Monitoring Instrument (OMI). The algorithm is based on direct spectrum fitting, and adopts a two-step fitting routine to account for liquid water absorption. Previous studies have shown that glyoxal retrieval algorithms are highly sensitive to the position of th...
متن کاملMulti axis differential optical absorption spectroscopy (MAX-DOAS) of gas and aerosol distributions.
We present and demonstrate a relatively simple algorithm, which converts a set of slant column density measurements of oxygen dimers (O4) and NO2 at several different elevation angles to determine the atmospheric aerosol extinction and the absolute concentration and mixing ratio of NO2 within the atmospheric boundary layer. In addition the height of the atmospheric boundary layer can usually be...
متن کاملA kinetic mechanism for predicting secondary organic aerosol formation from toluene oxidation in the presence of NOx and natural sunlight
A kinetic mechanism to predict secondary organic aerosol (SOA) formation from the photo-oxidation of toluene was developed. Aerosol phase chemistry that includes nucleation, gas–particle partitioning and particle-phase reactions as well as the gas-phase chemistry of toluene and its degradation products were represented. The mechanism was evaluated against experimental data obtained from the Uni...
متن کامل