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Cloud Liquid Water Content and Cloud Attenuation Studies with Radiosonde Data at a Tropical Location

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Abstract

The profile of cloud liquid water density and the total liquid water content (LWC) are obtained from the radiosonde data using the Salonen model at Kolkata, India, a tropical location. The cumulative distribution LWC shows a departure from the ITU-R model at this location, exhibiting a significantly enhanced occurrence during the monsoon months. The cloud attenuation, derived by integrating the profile of specific attenuation obtained from the radiosonde data, is related to LWC at different frequencies in the range 10-100 GHz. A comparison indicates that the cloud attenuation at frequencies below 50 GHz is somewhat overestimated by the ITU-R model generated values and significantly underestimated by the ITU-R model at frequencies above 70 GHz at the present location.

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Acknowledgements

This work has been supported by the project “Radio Remote Sensing of Tropical Atmosphere” funded by Indian Space Research Organisation, under S.K. Mitra Centre for Research in Space Environment, University of Calcutta. The British Atmospheric Data Centre, UK, has provided the access to the radiosonde data which is thankfully acknowledged.

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Authors and Affiliations

  1. S K Mitra Centre for Research in Space Environment, Institute of Radio Physics and Electronics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata, 700009, India

    Animesh Maitra

  2. Department of Electronics and Telecommunications, JIS College of Engineering, Kalayani, Nadia, West Bengal, PIN 741235, India

    Swastika Chakraborty

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  1. Animesh Maitra
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  2. Swastika Chakraborty
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Correspondence to Animesh Maitra.

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Maitra, A., Chakraborty, S. Cloud Liquid Water Content and Cloud Attenuation Studies with Radiosonde Data at a Tropical Location. J Infrared Milli Terahz Waves 30, 367–373 (2009). https://doi.org/10.1007/s10762-008-9452-8

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  • DOI: https://doi.org/10.1007/s10762-008-9452-8

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