Surface ozone measurements using differential absorption lidar

Sohan Lal Jain; B. C. Arya; Sachin D. Ghude; Arun Kumar Arora; Randhir K. Sinha

doi:10.1117/12.578168

12 January 2005 Surface ozone measurements using differential absorption lidar

Sohan Lal Jain, B. C. Arya, Sachin D. Ghude, Arun Kumar Arora, Randhir K. Sinha

Proceedings Volume 5653, Lidar Remote Sensing for Industry and Environmental Monitoring V; (2005) https://doi.org/10.1117/12.578168
Event: Fourth International Asia-Pacific Environmental Remote Sensing Symposium 2004: Remote Sensing of the Atmosphere, Ocean, Environment, and Space, 2004, Honolulu, Hawai'i, United States

Abstract

Human activities have been influencing the global atmosphere since the beginning of the industrial era, causing shifts from its natural state. The measurements have shown that tropospheric ozone is increasing gradually due to anthropogenic activities. Surface ozone is a secondary pollutant, its concentration in lower troposphere depends upon its precursors (CO, CH4, non methane hydrocarbons, NOx) as well as weather and transport phenomenon. The surface ozone exceeding the ambient air quality standard is health hazard to human being, animal and vegetation. The regular information of its concentrations on ground levels is needed for setting ambient air quality objectives and understanding photo chemical air pollution in urban areas. A Differential Absorption Lidar (DIAL) using a tunable CO₂ laser has been designed and developed at National Physical Laboratory, New Delhi, to monitor water vapour, surface ozone, ammonia, ethylene etc. Some times ethylene and surface ozone was found to be more than 40 ppb and 140 ppb respectively which is a health hazard. Seasonal variation in ozone concentrations shows maximum in the months of summer and autumn and minimum in monsoon and winter months. In present communication salient features of experimental set up and results obtained will be presented in detail.

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Sohan Lal Jain, B. C. Arya, Sachin D. Ghude, Arun Kumar Arora, and Randhir K. Sinha "Surface ozone measurements using differential absorption lidar", Proc. SPIE 5653, Lidar Remote Sensing for Industry and Environmental Monitoring V, (12 January 2005); https://doi.org/10.1117/12.578168

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KEYWORDS

Ozone

Absorption

Gas lasers

Carbon monoxide

LIDAR

Atmospheric monitoring

Nanolithography

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