Webinaar 17 LIDAR Science and Technology

Updated on
Talk 1: Earth’s Atmosphere and its Exploration PPT and VIDEO
Talk 2: World of Atmospheric LIDAR-Part I  PPT and VIDEO
Talk 3: World of Atmospheric LIDAR-Part II PPT and VIDEOTalk 4 Exploration of the Atmosphere using LIDAR  PPT and VIDEO
Space Education and Research Foundation announces, its 17th webinar. This will be on “LIDAR Science and Technology”. This webinar will have four scientific talks by Prof. Som Kumar Sharma. The live transmission will be daily one talk during 06:00 to 07:00 UT on 9th, 10th, 11th and 12th September 2019.
Please check the time at your location (e.g. in India it will be 11:30 to 12:30 IST).
The titles of the talks are as follows:
Talk 1: Earth’s Atmosphere and its Exploration on 9th September 2019
Talk 2: World of Atmospheric LIDAR-Part I on 10th September 2019
Talk 3: World of Atmospheric LIDAR-Part II on 11th September 2019
Talk 4: Exploration of the Atmosphere using LIDAR on 12th September 2019

About the speaker (Prof. Som Kumar Sharma):
Prof. Som Kumar Sharma, M.Sc and Ph.D in Physics is an Associate Professor at PRL, Ahmedabad. He has received young scientist award from International Union of Radio Science (URSI) in 2002 at Netherlands, and IAGA young scientist award in 2004 in England. He is recipient of several young scientist awards and grants from COSPAR, SPARC, WCRP, etc.  He is a COSPAR Associate since 2006 and a member of several national/international professional organizations. He visited and gave lectures at Arecibo Observatory, Puerto Rico (USA), and NCAR, Boulder, USA. During January 2014 he visited University of Adelaide, Australia. He has been the main convenor of atmospheric science sessions in the AOGS-2014, 2015, 2017, 2018 and 2019. He is an elected Associate Fellow of Gujarat Science Academy and Vice-Chairman of IMSA. He has published more than 75 research papers in peer reviewed journals and 23 full length papers in conference proceedings and presented 150 research papers in conferences. He has delivered more than 75 invited scientific lectures in India and abroad.

The summary of the talks given below:
Talk 1 “Earth’s Atmosphere and its Exploration”
Earth’s atmosphere is unique and having life supporting constituents. Based on its vertical thermal structure, its nomenclature as Troposphere, Stratosphere, Mesosphere and Thermosphere. Exploration of the atmosphere is very important and various tools and techniques are used for its investigation. There are various techniques, such as In-situ, remote sensing, etc. for the exploration of the Earth’s atmosphere. Remote sensing is very effective techniques for study of various regions of the Atmosphere. RADAR (Radio Detection And Ranging) and LIDAR (Light Detection And Ranging) are state of the art and most important tools for study of vertical distribution of various processes taking place in atmosphere. RADAR and LIDAR, both works on the similar principle, but RADAR uses radio waves and LIDAR uses laser light for various atmospheric studies. In this lecture basics of the Earth’s atmosphere and tools/techniques for its exploration will be presented and discussed.
Talk2: “World of Atmospheric LIDAR: Part-I”
LIDAR is an acronym of the Light Detection And Ranging. In LIDAR, powerful LASER (Light Amplification by Stimulated Emission of Radiation) light is transmitted into the atmosphere. When laser light passes through the atmosphere then various processes such as, scattering, attenuation, absorption, fluorescence, resonance, etc. take place. These processes are very effectively utilized by LIDAR for the investigations of the variety of phenomenon and constituents in the atmosphere. Lidars are named as: Rayleigh LIDAR, Mie LIDAR, Raman LIDAR, and these works on the Rayleigh scattering, Mie scattering and Raman scattering, respectively. In this talk various types of Lidars along with their working principles will be presented.
Talk3: “World of Atmospheric LIDAR: Part-II”
LIDAR which works on the fluorescence is known as fluorescence LIDAR. There is a technique of differential absorption, which is very effectively being used in the Lidar for the study of the vertical distribution of various atmospheric constituents. Lidar works on the technique of Differential Absorption is known as Differential Absorption Lidar (DIAL). Lidars are also extensively and effectively used for the study of metals (Na, K etc.) present in the upper part of the mesosphere and lower part of the thermosphere in the Earth’s atmosphere. These are commonly known as Na-Lidar, K-Lidar, etc. In this talk various types of Lidars along with their working principles will be presented and discussed.
Talk 4: “Exploration of the Atmosphere using LIDAR”
LIDAR is a state of art instrument for atmospheric investigations. In the Earth’s troposphere temperature is decreasing with altitude (hence turbulent) and all the weather phenomena take place in this region.  In the lower atmosphere, dynamics of Atmospheric Boundary Layer (ABL), Clouds, Aerosols (dust) and various other pollutants are studied using Lidar. Thermal structure of stratosphere is stable (temperature is increasing with altitude) and it is most stable region of the Earth’s atmosphere. Stratosphere is a reservoir of the ozone, which protects us from ultraviolet (UV) radiations. Stratospheric Sudden Warming (SSW), occurrence of double stratopause, etc. takes place in this region. Mesosphere is having unstable thermal structure and turbulent with lesser atmospheric density. Mesospheric Temperature Inversions (MTI), etc. takes place in this region. In this talk LIDAR based studies of the vertical structures and variability of the Temperature, Clouds, ABL, Dust, SSW, MTI, etc. will be presented.
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