Environmental Monitoring and Assessment

, Volume 184, Issue 4, pp 1857–1863 | Cite as

Ground level volume mixing ratio of methane in a tropical coastal city

  • George Thomas
  • E. J. Zachariah


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.


Methane Urban regions Coastal city Urban heat island 


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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Atmospheric Sciences DivisionCentre for Earth Science StudiesThiruvananthapuramIndia

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