Mr. M. Arunachalam Srinivasan Profile

M. Arunachalam Srinivasan

SERB-National Post Doctoral Fellow

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Proceedings Article | 5 May 2016 Paper

Lidar observation of transition of cirrus clouds over a tropical station Gadanki (13.450 N, 79.180 E): case studies

M. Srinivasan, C. Dhananjaya Rao, M. Krishnaiah

Proceedings Volume 9879, 98790H (2016) https://doi.org/10.1117/12.2222745

KEYWORDS: Clouds, LIDAR, Radar, Satellites, Backscatter, Geometrical optics, Wind measurement, Particles, MODIS, Crystals

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The present study describes Mie lidar observations of the cirrus cloud passage showing transition between double thin layers into single thick and single thick layer into double thin layers of cirrus over Gadanki region. During Case1: 17 January 2007, Case4: 12 June 2007, Case5: 14 July 2007 and Case6: 24 July 2007 the transition is found to from two thin cirrus layers into single geometrically thick layer. Case2: 14 May 2007 and Case3: 15 May 2007, the transition is found to from single geometrically thick layer into two thin cirrus layers. Linear Depolarization Ratio (LDR) and Back Scatter Ration (BSR) are found to show similar variation with strong peaks during transition; both LDR and Cloud Optical Depth (COD) is found to show similar variation except during transition with strong peaks in COD which is not clearly found from LDR for the all cases. There is a significant weakening of zonal and meridional winds during Case1 which might be due to the transition from multiple to single thick cirrus indicating potential capability of thick cirrus in modulating the wind fields. There exists strong upward wind dominance contributed to significant ascent in cloud-base altitude thereby causing transition of multiple thin layers into single thick cirrus.

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