28 February 2002 Measurements of the methane content in the atmospheric boundary layer in the atmospheric depth
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Proceedings Volume 4678, Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; (2002) https://doi.org/10.1117/12.458472
Event: Eighth Joint International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 2001, Irkutsk, Russian Federation
Abstract
The results of continuous measurements of methane concentrations (CH4) in air samples taken near the ground and in the atmospheric depth (column) in Obninsk in 1998 - 2001 are given. The air samples were taken in town so the measurement results were affected by not only natural but also by anthropogenic sources. Under a temperature inversion in the atmospheric boundary layer the concentrations of CH4 found were significantly higher than its typical values. This is caused by anthropogenic CH4 accumulation in air near the ground due to the absence of vertical mixing at a temperature inversion. Seasonal variations of methane in the boundary layer were determined over CH4 minimal concentrations. A height- averaged concentration of methane in the atmospheric column was determined over the solar radiation spectra in the absorption band of CH4 with the center at 3.3 micrometers . A comparison of the results shows that methane concentration near the ground exceeds its height-averaged concentration in the atmospheric column by about 0.15 ppm.
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Vladimir N. Aref'ev, Yu. I. Baranov, E. L. Baranova, G. I. Bougrim, N. Ye. Kamenogradsky, F. V. Kashin, "Measurements of the methane content in the atmospheric boundary layer in the atmospheric depth", Proc. SPIE 4678, Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, (28 February 2002); doi: 10.1117/12.458472; https://doi.org/10.1117/12.458472
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