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Proceedings Paper

Investigation of tropical cirrus cloud properties using ground based lidar measurements
Author(s): Reji K. Dhaman; Malladi Satyanarayana; V. Krishnakumar; V. P. Mahadevan Pillai; G. S. Jayeshlal; K. Raghunath; M. Venkat Ratnam
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Paper Abstract

Cirrus clouds play a significant role in the Earths radiation budget. Therefore, knowledge of geometrical and optical properties of cirrus cloud is essential for the climate modeling. In this paper, the cirrus clouds microphysical and optical properties are made by using a ground based lidar measurements over an inland tropical station Gadanki (13.5°N, 79.2°E), Andhra Pradesh, India. The variation of cirrus microphysical and optical properties with mid cloud temperature is also studied. The cirrus clouds mean height is generally observed in the range of 9-17km with a peak occurrence at 13- 14km. The cirrus mid cloud temperature ranges from -81°C to -46°C. The cirrus geometrical thickness ranges from 0.9- 4.5km. During the cirrus occurrence days sub-visual, thin and dense cirrus were at 37.5%, 50% and 12.5% respectively. The monthly cirrus optical depth ranges from 0.01-0.47, but most (<80%) of the cirrus have values less than 0.1. Optical depth shows a strong dependence with cirrus geometrical thickness and mid-cloud height. The monthly mean cirrus extinction ranges from 2.8E-06 to 8E-05 and depolarization ratio and lidar ratio varies from 0.13 to 0.77 and 2 to 52 sr respectively. A positive correlation exists for both optical depth and extinction with the mid-cloud temperature. The lidar ratio shows a scattered behavior with mid-cloud temperature.

Paper Details

Date Published: 5 May 2016
PDF: 10 pages
Proc. SPIE 9876, Remote Sensing of the Atmosphere, Clouds, and Precipitation VI, 98760P (5 May 2016); doi: 10.1117/12.2222314
Show Author Affiliations
Reji K. Dhaman, Univ. of Kerala (India)
Indian Naval Academy (India)
Malladi Satyanarayana, Univ. of Kerala (India)
Geethanjali College of Engineering and Technology (India)
V. Krishnakumar, St. Gregorios College (India)
V. P. Mahadevan Pillai, Univ. of Kerala (India)
G. S. Jayeshlal, Univ. of Kerala (India)
K. Raghunath, National Atmospheric Research Lab. (India)
M. Venkat Ratnam, National Atmospheric Research Lab. (India)


Published in SPIE Proceedings Vol. 9876:
Remote Sensing of the Atmosphere, Clouds, and Precipitation VI
Eastwood Im; Raj Kumar; Song Yang, Editor(s)

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