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Title: Correlation analysis of lidar derived optical parameters for investigations on thin cirrus features at a tropical station Gadanki(13.5ºN and 79.2ºE), India
Authors: Jayeshlal, G. S.
Satyanarayana, M.
Motty, G S
Dhamana, Reji K
Pillai, Mahadevan V P
Keywords: Lidar;Lidar ratio;Optical depth;Linear depolarisation ratio;Ice water content
Issue Date: Mar-2018
Publisher: NISCAIR-CSIR, India
Abstract: The optical characterization of thin cirrus clouds is very important to understand its radiative effects. The optical parameters of cirrus clouds namely extinction (𝜎), Optical depth (𝜏) and Linear depolarization ratio (LDR), have been derived from lidar data, obtained from a ground based polarization lidar at a tropical station, Gadanki (13.5ºN and 79.2ºE), India. The range dependent Lidar ratio (LR) has been derived by using an in-house developed iterative method. The present study makes an effort to understand the correlation between different optical parameters, and to get an insight in to the structure, composition and stability of the topical cirrus clouds. The variation of LR values with LDR gives an idea about the nature of aerosol content present within the cloud. It has been observed that there is a negative correlation between LDR and LR with a second degree polynomial fit for thin cirrus cloud conditions. The correlation between ice water content (IWC) derived directly from extinction value and LDR has been found to be positive and it has been used to establish cloud phase accurately instead of from the LDR value itself. From the time series observation it has been also found that the extinction and hence the IWC increases due to the growth of cirrus particle.
Page(s): 9-19
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.47(1-2) [March-June 2018]

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