Ground level volume mixing ratio of methane in a tropical coastal city |
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Authors: | George Thomas E J Zachariah |
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Institution: | (1) Department of Civil and Environmental Engineering, The University of Michigan, 1351 Beal Avenue, Ann Arbor, MI 48109-2125, USA; |
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Abstract: | Urban regions are hotspots of greenhouse gas emissions which include CO2, CH4, N2O, etc. Methane is a strong greenhouse gas which is produced from a number of sources including fossil fuel combustion, municipal
waste, and sewage processing, etc. Ground level mixing ratio of methane in the tropical coastal city of Thiruvananthapuram
in South India, during calm early morning period was measured. Measurements were done during both winter and summer seasons.
Concentrations were significantly higher than global average value. Intra-city variation in ground level mixing ratio was
also significant. Ground level methane concentration at Thiruvananthapuram urban area showed maximum value of 3.16 ppmV. Under
stable atmospheric conditions in early morning, ground level mixing ratio of methane was 2.79 ppmV in winter and 2.54 ppmV
during summer. The spatial distribution of methane concentration shows correlation with urban heat island. |
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