MEASUREMENTS OF NITROGEN DIOXIDE AND IDENTIFICATION OF MOLECULAR COMPOSITION OF AEROSOLS IN THE ATMOSPHERIC BOUNDARY LAYER

摘要

During the Winter Cloud-Aerosol-Radiation Experiment at Zvenigorod Scientific Station near Moscow in February 1999, samples of submicron atmospheric aerosols were collected accompanied by measurements of atmospheric nitrogen dioxide contents. The aim was searching for the relationship of presence of nitrogen compounds in atmospheric aerosols with pollution of the lower troposphere by nitrogen oxides. All the aerosol transmittance spectra exhibit absorption bands characteristic of ammonium sulfate, and some of spectra exhibit also absorption bands characteristic for nitric acid HO-NO_2. The latter feature has been only found in aerosol samples collected during periods including episodes of enhanced column tropospheric NO_2 contents. This implies possible relation of aerosol nitric acid compounds to pollution of the atmosphere by nitrogen compounds, more definitely, to large contents of nitrogen dioxide.