Specific features of photochemical processes in air of industrial centers of the far east

Boris D. Belan; V. E. Meleshkin; Gennadii N. Tolmachev

doi:10.1117/12.221037

20 September 1995 Specific features of photochemical processes in air of industrial centers of the far east

Boris D. Belan, V. E. Meleshkin, Gennadii N. Tolmachev

Proceedings Volume 2506, Air Pollution and Visibility Measurements; (1995) https://doi.org/10.1117/12.221037
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

Some results of experimental investigations of photochemical processes in air over industrial centers of the Far East of the USSR are presented. It is shown that an almost permanent presence of two temperature inversions (near-ground and elevated ones) in the atmosphere over this region results in the formation of two layers of pollutant over the cities. The first layer accumulates atmospheric emissions from low-altitude sources and the second, from high- altitude sources. The photochemical change of the primary emissions into the secondary products takes place in the upper layer within the 200-400 m altitudes where enhanced content of photochemcially active gases takes place. There are no photochemical processes in the near- ground layer because the elevated layer of pollutants screens the UV radiation. However, the secondary products have been detected near the ground. They come here from the upper level due to sedimentation at night. It was noted that over the cities the secondary products of the near-ground layer are rapidly destructed, while outside the cities they live for a longer time. This is caused by the destruction of the secondary products by the atmospheric aerosol especially by its photochemical fraction.

Citation Download Citation

Boris D. Belan, V. E. Meleshkin, and Gennadii N. Tolmachev "Specific features of photochemical processes in air of industrial centers of the far east", Proc. SPIE 2506, Air Pollution and Visibility Measurements, (20 September 1995); https://doi.org/10.1117/12.221037

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available