Urban Atmospheric 14 CO and 14 CH 4 Measurements by Accelerator Mass Spectrometry

Atmospheric gas samples (0.1m 3 ) were collected at ground level during January/February 1984 in Las Vegas, Nevada for 14 C/ 13 C accelerator mass spectrometry and total abundance measurements of CO and CH 4 . During winter months in this locale, CO concentrations can occur at 10 to 100 times background, occasionally exceeding the National Ambient Air Quality Standard (NAAQS). Methane concentrations show a slight enhancement (∼24%) above the background (non-urban troposphere) level. A comparison of CO and CH 4 concentrations shows a good linear correlation which may indicate a common source. Preliminary 14 C/ 13 C results of the two species suggest that fossil emissions are the predominant source of excess CO and CH 4 in the samples taken. Estimates of anthropogenic CO and CH 4 are important for source apportionment of combustion emissions. In addition, this information is valuable for understanding the global CO and CH 4 cycles and, therefore, human impact on climate and the stratospheric ozone layer

Accelerator mass spectrometry · Atmospheric sciences · Las vegas · Mass spectrometry · Methane · Ozone · Radiocarbon dating · Troposphere · Atmospheric and Environmental Gas Dynamics · Atmospheric chemistry and aerosols · Atmospheric Ozone and Climate · Chemistry · Environmental Science · Environmental Chemistry · Geology

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