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Proceedings Paper

Measurements of liquid water content and trace species in the atmosphere using differential absorption lidar
Author(s): Sohan Lal Jain; B. C. Arya; Arun Kumar
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Paper Abstract

The earth's environment is constantly changing. Scientific evidence indicates that these changes are result of a complex interplay among a number of natural and human related systems. Therefore in recent times, concern has grown about global change studies - which is related to natural and anthropogenic alteration of the Earth's environment. The atmospheric trace gases play an important role in many processes such as biosphere-troposphere interaction, the chemistry of troposphere and the troposphere - stratosphere exchange. Therefore measurement of various minor constituents in the atmosphere is of great significance to understand physics, Chemistry and dynamics of the atmosphere. A Differential Absorption Lidar (DIAL) system using a tunable CO2 laser has been designed and developed at National Physical Laboratory, New Delhi, to monitor various minor constituents in the atmosphere. The system is being used to monitor water vapour, surface ozone, ammonia and ethylene concentration. Some times these trace species were found to be quite high which is a health hazard. Some measurements have also been made to estimate the liquid water contents of the fog by the measurement of CO2 laser transmission at 9.5 μm. The liquid water content was found to be in the range 0.008 - 0.2 gm/m3 depending on the density of fog. In the present communication salient features of experimental set up and results obtained will be presented in detail.

Paper Details

Date Published: 21 March 2003
PDF: 11 pages
Proc. SPIE 4893, Lidar Remote Sensing for Industry and Environment Monitoring III, (21 March 2003); doi: 10.1117/12.466513
Show Author Affiliations
Sohan Lal Jain, National Physical Lab. (India)
B. C. Arya, National Physical Lab. (India)
Arun Kumar, National Physical Lab. (India)

Published in SPIE Proceedings Vol. 4893:
Lidar Remote Sensing for Industry and Environment Monitoring III
Upendra N. Singh; Toshikasu Itabe; Zhishen Liu, Editor(s)

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