DIAL Tropospheric Ozone Measurement Using a Nd:YAG Laser and the Raman Shifting Technique
نویسندگان
چکیده
منابع مشابه
The tropospheric ozone problem.
Derived from measurements it has been concluded that in the last hundred years the ground-based ozone concentration has risen by about a factor of two. Models also show a doubling of the tropospheric ozone content due to human activities. It is very likely that mean ozone concentration will further increase. In contrast, episodes with excess ozone levels ("summer smog") have become rare in Cent...
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Considerable discussion still centres around the relative merits of the Argon and Neodymium Yttrium Aluminum Garnet (NdYAG) lasers for the endoscopic treatment of gastrointestinal haemorrhage, although both are undoubtedly effect. We have carried out experiments to elucidate which factors determine the safety and efficacy of NdYAG laser photocoagulation. Histological studies on normal gastric m...
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Background: Tropospheric ozone is difficult to retrieve from satellites because of the abundance of ozone in the stratosphere. Tropospheric ozone has become a significant environmental issue and can be exacerbated by UT/LS folding and longrange transport events. Ozone can be moved from the stratosphere to the troposphere by upper tropospheric meteorological events. The Ozone Monitoring Instrume...
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The description of ozone differential absorption lidar (DIAL) based on KrF and XeCl excimer lasers for day and night-time measurements in the troposphere is presented. The XeCl laser is used as the “off” wavelength emitter and the radiation of KrF laser is Raman-shifted in a hydrogen and deuterium cell to obtain 277 nm and 292 nm “on” wavelengths. For the measurements in the range 0.5–4.5 km th...
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Ozone is produced in the troposphere by gas-phase oxidation of hydrocarbons and CO catalyzed by hydrogen oxide radicals (HOx ≡ OH + H + peroxy radicals) and nitrogen oxide radicals (NOx ≡ NO+NO2). Heterogeneous chemistry involving reactions in aerosol particles and cloud droplets may affect O3 concentrations in a number of ways including production and loss of HOx and NOx, direct loss of O3, an...
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ژورنال
عنوان ژورنال: Journal of Atmospheric and Oceanic Technology
سال: 1989
ISSN: 0739-0572,1520-0426
DOI: 10.1175/1520-0426(1989)006<0832:dtomua>2.0.co;2