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Dr. R. Vishnu

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Dr. R. Vishnu

Assistant Professor

M.Sc., M. Phil., Ph. D.

[email protected]

Specialization :

Atmospheric Electricity, Thundercloud dynamics, Extreme Events

Academic Qualifications
Ph. D.

2012

National Centre for Earth Science Studies (NCESS), MoES, Govt. of India, Thiruvananthapuram ( Through University of Kerala)

M. Phil.

2008

Bharathidasan University

M. Sc.

2004

University of Kerala

Dr. Vishnu R. obtained his M.Sc. in Physics from the University of Kerala and then completed his Ph.D. from the Atmospheric Sciences Division of the National Centre for Earth Science Studies (NCESS) in 2012. During his doctoral studies under the supervision of Dr. S. Muralidas, his research focused on the formation, experimental detection and electrical characteristics of Cumulonimbus clouds. At NCESS, he gained expertise in using advanced instrumentation such as LIDAR, Lightning Detector, Radioactive Potential Equalizer, Air Earth Current sensor and Condensation Particle Counter. He also designed and built a Modified Electric Field Mill to measure electric field variations caused by charged clouds. After completing his Ph.D., he worked as a KSCSTE-Postdoctoral Fellow at the same institute before becoming an Assistant Professor in the Department of Physics at Sree Krishna College, Guruvayur.

Dr. Vishnu R. is a recipient of the Young Scientist Award from the Kerala State Council for Science, Technology and Environment, Govt. of Kerala in 2008. He has presented his research at various international events, including the COSPAR conference in Germany in 2010. Additionally, he has received Foreign Travel Assistance from several national and international funding agencies such as the Committee on Space Research (COSPAR), France, the Indian National Science Academy (INSA), the Council of Scientific and Industrial Research (CSIR), the World Meteorological Organization (WMO), Switzerland, and the Department of Science & Technology (DST), Government of India. His current research interests include Thundercloud dynamics, Extreme Events, and Ocean-Atmosphere interaction.

Two research scholars completed PhDs under his supervision, and three are pursuing their programs.

Vidwan-ID : 512699

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PublicationsResearch StudentsProjectsAwards

Professional Experience

positioninstitutefromto
Assistant Professor Post Graduate Department of Physics & Research Centre, Sree Krishna College, Guruvayur07-08-2013Till date
Post Doctoral FellowNational Centre for Earth Science Studies (NCESS), MoES, Govt. of India, Thiruvananthapuram01-01-201305-08-2013
Project FellowNational Centre for Earth Science Studies (NCESS), MoES, Govt. of India, Thiruvananthapuram01-01-200931-12-2012
Project FellowNational Centre for Earth Science Studies (NCESS), MoES, Govt. of India, Thiruvananthapuram06-02-200831-12-2008
Project FellowNational Centre for Earth Science Studies (NCESS), MoES, Govt. of India, Thiruvananthapuram23-03-200519-09-2006

Honors/Awards/Achievements

  • Young Scientist Award, 2008 (KSCSTE, Govt. of Kerala)
  • Post Doctoral Fellowship, 2012 (KSCSTE, Govt. of Kerala)
  • International Travel Grants:
    • Committee on Space Research (COSPAR), France
    • Indian National Science Academy (INSA)
    • Council of Scientific and Industrial Research (CSIR) 

    (for attending the 38th scientific assembly of COSPAR held in Bremen, Germany (2010)

    • World Meteorological Organization (WMO), Switzerland

    (for attending the YOTC-AMY workshop held in Beijing, China)

    • Department of Science & Technology (DST), Govt. of India
    • Council of Scientific and Industrial Research (CSIR)

    (for attending the 7th Asia-Pacific International Conference on Lightning in Chengdu, China)

Membership in Professional/Academic Bodies

  • Editorial Board Member, Discover Atmosphere- Springer Nature, UK
  • COSPAR (Committee on Space Research) Associate, France
  • Member, Board of Studies (Nanoscience & Technology), University of Calicut (2016-2019)

External Funded Projects

  • ‘Investigation on Lightning Activity Over Kerala and its Association With Dynamical and Thermodynamical Parameters’ (2022)
  • Funding Agency : KSCSTE, Govt. of Kerala
  • Amount sanctioned: ₹ 12,22,000
  • Duration: 3 Years

International Conferences attended

  • 38th Scientific Assembly of Committee on Space Research, July 18-25, 2010, Germany.
  • American Geophysical Union (AGU) Chapman Conference on Complexity and Extreme Events in Geosciences, February 15-19, 2010, India
  • The YOTC International Science Symposium ＆8th AMY Workshop, May 16-19, 2011, Beijing.
  • 7th Asia Pacific International Conference on Lightning, November 1-4, 2011, Chengdu, China.  

Training Programs Attended

  • SERC School on ‘Electro Dynamical Coupling of Atmospheric Regions.’ “Balloon and Rocket- borne sensors to measure electrical parameters in atmosphere and ionosphere”
  • Indian Institute of Geomagnetism, Mumbai, 6-19 January, 2010. 

Publications in Books/Peer-Reviewed journals

18. Hamza Varikoden, V.H. Jamshadali , Catherine George , T. Reshma , R. Vishnu, Historical and future projections southwest monsoon rainfall extremes: a comprehensive study using CMIP6 simulations, Atmos. Res. (2024), https://doi.org/10.1016/j.atmosres.2024.107870

 

17. K Nandhulal, R Vishnu, TS Sreekanth, Hamza Varikoden, Spatiotemporal changes of lightning incidence and its relationship with dynamic and thermodynamic factors over a lightning prone tropical region, Nat Hazards, 2024, https://doi.org/10.1007/s11069-024-07049-3  

 

16. Linsha C. L, Reshma T, Hamza Varikoden, Vishnu R, Thermodynamic and stability features of the atmospheric boundary layer over Kochi during different monsoon seasons based on radiosonde profiles, J. Atmospheric and Solar-Terrestrial Physics, Volume 256, 2024, 106209, ISSN 1364-6826, https://doi.org/10.1016/j.jastp.2024.106209 

 

15. Hamza Varikoden, V.H Jamshadali, R. Vishnu, Dynamic aspects of regional extreme rainfall events during the southwest monsoon period over the Indian subcontinent, J. Hydrology, Volume 632, 2024, 130887, ISSN 0022-1694, https://doi.org/10.1016/j.jhydrol.2024.130887.

 

14. Varikoden, H., P. P. V. H. Hrudya, R. N. Vishnu, and J. Kuttippurath, 2022: Changes in the ENSO-ISMR relationship in the historical and future projection periods based on coupled models. Int. J. Climatology, 42, 2225−2245, https://doi.org/10.1002/joc.7362

13. V.H. Jamshadali, M.J.K. Reji, Hamza Varikoden, R. Vishnu, Spatial variability of south Asian summer monsoon extreme rainfall events and their association with global climate indices, J.Atmospheric and Solar-Terrestrial Physics, Volume 221, 2021, 105708, ISSN 1364-6826,  https://doi.org/10.1016/j.jastp.2021.105708   

 

12. Hrudya, P.H., Varikoden, H. & Vishnu, R. Regional variabilities of rainfall and convective parameters during the summer monsoon period: their linkage with El Niño Southern Oscillation. Meteorol Atmos Phys 133, 1223–1232 (2021). https://doi.org/10.1007/s00703-021-00802-4

11. Hrudya PH, Varikoden H, Vishnu R (2021) Changes in the relationship between Indian Ocean dipole and Indian summer monsoon rainfall in early and recent multidecadal epochs during different phases of monsoon. Int J Climatol 41:305-318. http://doi.org/10.1002/joc.6685 

10. Hrudya, P.H., Varikoden, H. & Vishnu, R. A review on the Indian summer monsoon rainfall, variability and its association with ENSO and IOD. Meteorol Atmos Phys 133, 1–14 (2021). https://doi.org/10.1007/s00703-020-00734-5

09. Hrudya, P.H., Varikoden, H., Vishnu, R.  Changes in ENSO-monsoon relations from early to recent decades during onset, peak and withdrawal phases of Indian summer monsoon. Clim Dyn 55, 1457–1471 (2020). https://doi.org/10.1007/s00382-020-05335-x 

08. R. Harikumar, Hamza Varikoden , C. A. Babu , R. Vishnu, and G. Mohan Kumar, An investigation on the consequential features of Southwest Monsoon-2007 Onset and Super cyclone 'Gonu' using Satellite, Model and Ground-based data, J. Ind. Geophysical Union, 18, 3, 319-329 (2014)

07. R. Vishnu, V. Anil Kumar, Hamza Varikoden, K. Sarath Krishnan, T. S. Sreekanth, V.N. Subi Symon, S. Murali Das & G. Mohan Kumar, Convective Thundercloud Development over Western Ghats Mountain Slope in Kerala, Current Science, 104, 11, 1506-1514, (2013)

06. C. P. Anil Kumar, R. Gopalsingh, C. Selvaraj, K. U. Nair, H. J. Jayakumar, R. Vishnu, S. Muralidas & N.Balan, Atmospheric electric parameters and micrometeorological processes during the solar eclipse on 15 January 2010, J. Geophys. Res., 118, 1-7 (2013) https://doi.org/10.1002/jgrd.50437

05. V. Anil Kumar, R. Vishnu, V. N. Subi Symon, S. Murali Das & G. Mohan Kumar, Feasibility of forewarning high lightning incidence by electric field measurements, J. Ind. Geophysical Union, 17,4, 361-368, (2013)

04. Shareekul Ansar, C.R. Dhanya, George Thomas, Aswathy Chandran, Liji John, S. Prasanthi, R. Vishnu, E.J. Zachariah, Study of Urban/Rural cooling rates in Thiruvananthapuram, Kerala, J. Ind. Geophysical Union, 16, 1, 29-36, (2012)

03. R. Vishnu, Hamza Varikoden, V. Anil Kumar, S. Murali Das, G. Mohan Kumar and V. N. Subi Symon, Abnormal modulation of atmospheric parameters during the Tsunami of 2004, Current Science, 102, 11, 1575-1580 (2012), https://www.currentscience.ac.in/Volumes/102/11/1575.pdf 

02. Varikoden, H.; Harikumar, R.; Vishnu, R.; Kumar, V.S.; Sampath, S.; Das, S.M.; Kumar, G.M., Observational study of cloud base height and its frequency over a tropical station, Thiruvananthapuram using Ceilometer, Int. J. Remote Sensing, 32, 23, 8505-8518, (2011), https://doi.org/10.1080/01431161.2010.542199

01. R. Vishnu, S. Murali Das, S. Sampath and G. Mohan Kumar, Detection of possible thunderstorm formation inferred from weather element changes at ground level on a mountain slope, J. Lightning Research, 2, 12-24, (2010) http://dx.doi.org/10.2174/1652803401002010012