Dr. Vishnu R., M. Sc., M. Phil., Ph. D., (PDF)
Address:
Dept. of Physics & Research Centre, Sree Krishna College, Guruvayur, Thrissur, PIN – 680102, KERALA
Email : vishnuplr@gmail.com
Education
- Ph. D. (Physics) : National Centre for Earth Science Studies, MOES, Govt. of India, Thiruvananthapuram (Through University of Kerala) (2012)
- M. Phil. (Physics) : Bharathidasan University (2008)
- M. Sc. (Physics) : University of Kerala (2004)
Awards /Fellowship
Young Scientist Award (KSCSTE, Govt. of Kerala)
Post-Doctoral Fellowship (2011) by the KSCSTE, Govt. of Kerala
Awarded International Travel Grants from
Committee on Space Research (COSPAR), France
Indian National Science Academy
Council of Scientific and Industrial Research, India
(for attending the 38th scientific assembly of COSPAR held at Bremen, Germany.)
Awarded International Travel Grant from
World Meteorological Organization (WMO), Switzerland
(for attending the YOTC-AMY workshop held at Beijing.)
Awarded International Travel Grants from
Department of Science and Technology, Govt. of India
Council of Scientific and Industrial Research, India
(for attending the 7th Asia-Pacific International Conference on Lightning held at Chengdu, China)
Research interests
- Atmospheric Electricity, Cloud Physics
Positions Held
- Assistant Professor: Dept. of Physics, Sree Krishna College Guruvayur (2013 – Present)
- Post-Doctoral Fellow: Atmospheric Sciences Division, NCESS, Thiruvananthapuram (2012-13)
- Project Fellow: Atmospheric Sciences Division, NCESS, Thiruvananthapuram (2008-12)
Publications
1. Hrudya PH, Varikoden H, Vishnu R, Kuttippurath J (2020) 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 http://doi.org/10.1007/s00382-020-05335-x
2. 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
3. Hrudya PH, Varikoden H, Vishnu R (2021) A review on the Indian Summer Monsoon Rainfall, Variability and their Association with ENSO and IOD. Meteorol Atmos Phys 133:1-14. http://doi.org/10.1007/s00703-020-00734-5
4. Hrudya PH, Varikoden H, Vishnu R (2021) 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. http://doi.org/10.1007/s00703-021-00802-4.
5. Hamza Varikoden, Hrudya PH, Vishnu R, Kuttippurath J. Changes in the ENSO-ISMR relationship in the historical and future projection periods based on coupled models. Int J Climatol (accepted)
6. An investigation on the consequential features of Southwest Monsoon-2007 Onset and Super cyclone ‘Gonu’ using Satellite, Model and Ground-based data, R. Harikumar, Hamza Varikoden , C. A. Babu , R. Vishnu, and G. Mohan Kumar, J. Ind. Geophysical Union, 18, 3, 319-329 (2014)
7. Feasibility of forewarning high lightning incidence by electric field measurements, V. Anil Kumar, R. Vishnu, V. N. Subi Symon, S. Murali Das & G. Mohan Kumar, J. Ind. Geophysical Union, 17,4, 361-368 (2013)
8. Investigation of Convective Thundercloud Development over Western Ghats Mountain Slope in Kerala, R. Vishnu, V. Anil Kumar, Hamza Varikoden, K. Sarath Krishnan, T. S. Sreekanth, V.N. Subi Symon, S. Murali Das & G. Mohan Kumar, Current Science, 104, 2013
9. Abnormal modulation of atmospheric parameters during the Tsunami of 2004, R. Vishnu, Hamza Varikoden, V. Anil Kumar, S. Murali Das, G. Mohan Kumar and V. N. Subi Symon, Current Science , 102, 11, 2012
10. Detection of possible thunderstorm formation inferred from weather element changes at ground level on a mountain slope, R. Vishnu, S. Murali Das, S. Sampath and G. Mohan Kumar, J. Lightning Research, 2, 12-24, 2010.
11. Observational study of cloud base height and its frequency over a tropical station, Thiruvananthapuram using Ceilometer, Hamza Varikoden, R. Harikumar, R. Vishnu, V. Sasi Kumar, S. Sampath, S. Murali Das and G. Mohan Kumar, Int. J. Remote Sensing, 1-14, DOI: 10.1080/01431161.2010.542199, 2011.
12. Atmospheric electric parameters and micrometeorological processes during the solar eclipse on 15 January 2010, C. P. Anil Kumar, R. Gopalsingh, C. Selvaraj, K. U. Nair, H. J. Jayakumar, R. Vishnu, S. Muralidas & N.Balan, J. Geophys. Res., DOI: 10.1002/jgrd.50437, 2013.
13. Study of Urban/Rural cooling rates in Thiruvananthapuram, Kerala, Shareekul Ansar, C.R. Dhanya, George Thomas, Aswathy Chandran, Liji John, S. Prasanthi, R. Vishnu, E.J. Zachariah, J. Ind. Geophysical Union, 16, 29-36, 2012.
Seminar / Conference Proceedings
International Conferences attended
38th Scientific Assembly of Committee on Space Research, 2010, Germany.
American Geophysical Union (AGU) Chapman Conference on Extreme Events, 2010.
YOTC-AMY workshop, Beijing, 2011, China.
7th Asia Pacific International Conference on Lightning, Chengdu, 2011, China.
Publications in International Conference Proceedings
1. Hrudya, P. H., Varikoden, H., Vishnu, R. (2018, January). Impact of lower tropospheric stability on the regional variability of Indian summer monsoon rainfall. Paper accepted for presentation at 42nd COSPAR, (Committee on Space Research) Scientific assembly, United States of America.
2. Measurements of cloud characteristics with a Ceilometer and supporting measurements with a water based Condensation Particle Counter, R. Vishnu, S. Murali Das, G. Mohan Kumar, Hamza Varikoden and S. Sampath, 38th scientific assembly of Committee on Space Research, July 18-25, Germany, 2010.
3. A modified Electric Field Mill and measurements of cloud electric field with it at a tropical coastal station, R. Vishnu, S. Murali Das, G. Mohan Kumar and S. Sampath, 38th scientific assembly of Committee on Space Research, July 18-25, Germany, 2010.
4. Characteristics of southwest monsoon clouds over a tropical station using a Ceilometer and a modified Electric Field Mill, R. Vishnu, V. Anil Kumar, K. Sarat Krishnan, Hamza Varikoden, V. N. Subi Symon, S. Murali Das and G. Mohan Kumar, YOTC-AMY Workshop, May 16-18, Beijing, China, 2011.
5. Formation of thunderclouds in a region of high lightning incidence inferred from AWS, Ceilometer and an Electric Field Mill, R. Vishnu, V. Anil Kumar, T. S. Sreekanth, V. N. Subi Symon, S. Murali Das and G. Mohan Kumar, 7th Asia Pacific International Conference on Lightning, Chengdu, China, 2011.
6. Investigations into cause of high lightning incidence and accidents by it in a region with relatively special characteristics, R. Vishnu, S. Murali Das, G. Mohan Kumar and S. Sampath, AGU Chapman Conference on Extreme Events, Feb. 15-19, India, 2012.
7. Study of changes in atmospheric electric parameters during solar eclipse transit stages, C. P. Anil Kumar, C. Panneerselvam, R.Gopalsingh , C. Selvaraj K. U. Nair and S. Gurubaran, R.Vishnu, V.N. Subi Symon and S. Murali Das, XIV International Conference on Atmospheric Electricity, August 08-12, Rio de Janeiro, Brazil, 2011.
8. Thundercloud formation in a tropical region having relatively special characteristics, R. Vishnu, V. Anil Kumar, V. N. Subi Symon and G. Mohan Kumar, 39th scientific assembly of Committee on Space Research, July 14-22, Mysore, India, 2012.
9. Concentration and characteristics of Condensation Nuclei at Thiruvananthapuram, a tropical coastal site, V. Anil Kumar, R.Vishnu, V.N. Subi Symon and G. Mohan Kumar, 39th scientific assembly of Committee on Space Research, July 14-22, Mysore, India, 2012.
10. Comparison of Condensation particle Concentration at two geographically different locations and its relation with weather parameters, V.N. Subi Symon, V. Anil Kumar, R.Vishnu, and G. Mohan Kumar, 39th scientific assembly of Committee on Space Research, July 14-22, Mysore, India, 2012.
11. Charcterisation of tropical rainfall in terms of size distribution and its seasonal variations in a tropical coastal site, T S, Sreekanth, R. Vishnu, V, Anil Kumar, G. Mohan Kumar and V. Sasi Kumar, 39th scientific assembly of Committee on Space Research, July 14-22, Mysore, India, 2012.
Publications in National Conference Proceedings
12. Sudden vertical motion of clouds in relation with pressure variation and wind direction, K. Sarath Krishnan, R. Vishnu, V. N. Subi Simon and S. Murali Das, 47th Annual Convention of Indian Geophysical Union, Dec. 8-10, Hyderabad, 2010.
13. Abnormal changes in weather elements and CO concentration observed on 26-12-04, the Tsunami day, R. Vishnu, G. Mohan Kumar, S. Murali Das, R. Anjali and S. Sampath, 46th Annual Convention of Indian Geophysical Union, Oct. 5-7, Dehradun, 2009.
14. Detection of thundercloud formation over a mountain slope using Lidar and supporting measurements with a modified Electric Field Mill, R. Vishnu, V. Anil Kumar, V.N. Subi Symon, S. Murali Das and G. Mohan Kumar, ARWPCC-2011, Mar. 10-11, Tirupati, 2011.
15. Detection of instability leading to thundercloud formation, R. Vishnu, S. Murali Das and G. Mohan Kumar, Kerala Science Congress, Jan. 28-31, Thiruvananthapuram, 2008.
16. Investigation of thundercloud formation near mountains, R. Vishnu, S. Murali Das, S. Sampath and G. Mohan Kumar, National Space Science Symposium, Ooty, Feb. 26-29, 2008.
17. Changes in atmospheric electrical parameters during solar eclipse transit stages during 15th January,2010, C. P. Anil Kumar, C. Panneerselvam, H. Johnson Jeyakumar, R.Gopalsingh, C.Selvaraj, K.U.Nair, S.Gurubaran, R. Vishnu, V.N.Subi Symon and S.Murali Das National Workshop on Solar Eclipse,pp(122-124), Space Physics Laboratory, VSSC, Trivandrum, 27-28, 2011.
18. Changes in atmospheric electrical parameters during solar eclipse transit stages during 15th January,2010, C. P. Anil Kumar, C. Panneerselvam, H. Johnson Jeyakumar, R.Gopalsingh, C.Selvaraj, K.U.Nair, S.Gurubaran, R. Vishnu, V.N.Subi Symon and S.Murali Das National Workshop on Solar Eclipse,pp(122-124), Space Physics Laboratory, VSSC, Trivandrum, 27-28, 2011.
19. Hrudya, P. H., Varikoden, H., Vishnu, R. (2018, January). Impact of lower tropospheric stability on the regional variability of Indian summer monsoon rainfall, 42nd COSPAR, (Committee on Space Research) Scientific assembly, USA
20. Hrudya, P. H., Varikoden, H., Vishnu, R. (2020, December). Changes in the relationship between El Niño Southern Oscillation and Indian summer monsoon rainfall in future decades. TROPMET 2020: National virtual Symposium on ‘Weather and Climate Services over Mountainous Regions’, NESAC, Shillong, Meghalaya.
Projects
Principal Investigator of KSCSTE funded project- ‘Electrical Characteristics of Thunderclouds and Lightning’ (KSCS -14)
Principal Investigator (KSCS-27, KSCSTE Post-Doctoral Program)
Membership in Academic Bodies/ Organisations
COSPAR (Committee on Space Research) Associate, France
Courses & Training Attended
SERC School on ‘Electro Dynamical Coupling of Atmospheric Regions.’ Indian Institute of Geomagnetism (2010).