Preprints
https://doi.org/10.5194/acp-2016-456
https://doi.org/10.5194/acp-2016-456

  20 Jun 2016

20 Jun 2016

Review status: this preprint was under review for the journal ACP. A revision for further review has not been submitted.

Lidar studies on microphysical influences on the structure and lifetime of tropical cirrus clouds

G. S. Motty1, Malladi Satyanarayana1,2, G. S. Jayeshlal1, and V. P. Mahadevan Pillai1 G. S. Motty et al.
  • 1Department of Optoelectronics, University of Kerala, Kariavattom, Trivandrum-695 581, Kerala, India
  • 2Geethanjali College of Engineering & Technology, Cheeryal (V), Keesara (M), R.R.Dist. Hyderabad-501 301, India

Abstract. An understanding of the role of ice crystals in the cirrus cloud is significant on the the radiative budget of the planet and consequent changes in the temperature. The structure and composition of the cirrus is affected by the microphysical parameters and size and fall speed of ice crystal inside the clouds. In this study, the structure and dynamics of tropical cirrus clouds were analysed by the microphysical characterisation using the data obtained by the ground based lidar system over the tropical site Gadanki [13.50° N, 79.20° E], India for a period of 6 years from 2005 to 2010. The observed clouds have optical depth within the range 0.02 to 1.8, lidar ratios are in the 20 to 32 sr range and depolarisation ratio varies between 0.05 and 0.45. The altitude and temperature dependence of the parameters, their interdependence and the fall velocity – effective size analysis were investigated. Dependence of the microphysical parameters on the ice fall velocity which is critical for climate change was also analysed. The same are compared with the CALIPSO satellite based CALIOP lidar observations.

G. S. Motty et al.

 
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

G. S. Motty et al.

G. S. Motty et al.

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Short summary
The important microphysical properties such as extinction coefficient, optical depth, lidar ratio and depolarisation ratio for cirrus clouds obtained during 2005–2010 were analysed using the observations made by the ground based lidar system at NARL Gadanki (13.50° N, 79.20° E) and are compared with the available night time observations from the CALIOP on board the CALIPSO satellite.
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