SCI Publications:

1. Unnikrishnan, C.K., Malavika, G.R., Shukla, A.K. et al. (2024).Analysis of tropical cloud-to-ground and intra-cloud lightning activity in southern India. J Earth Syst Sci 133, 237.
2. Jash D, Resmi EA, C.K. Unnikrishnan., Sumesh RK, Kumar S, Sukumar N. (2022) Analysis of Pre-Monsoon Convective Systems over a Tropical Coastal Region Using C-Band Polarimetric Radar, Satellite and Numerical Simulation. Atmosphere. 2022; 13(9):1349.
3. EA Resmi, B Preethi, RS Ajayamohan, Pallav Ray, C.K. Unnikrishnan, S Nita, RK Sumesh, J Dharmadas (2023) Analysis of localized features during wet and dry rainfall episodes over southern tip of India, International Journal of Climatology, 1-18.
4. Sumit K, RK Sumesh, EA Resmi, Dharmadas Jash, C.K. Unnikrishnan, Anusha Andrews, Nita Sukumar (2022) Raindrop size distribution of stratiform precipitation over Southwest India–The Gateway of Indian Summer Monsoon, Atmospheric Research, 272, 1-16.
5. C.K. Unnikrishnan, S Pawar, V Gopalakrishnan (2021) Satellite-observed lightning hotspots in India and lightning variability over tropical South India, Advances in Space Research, 1-16.
6. RK Sumesh, EA Resmi, C.K. Unnikrishnan, Dharmadas Jash, and KK Ramachandran (2021) Signatures of Shallow and Deep Clouds Inferred from Precipitation Microphysics Over Windward Side of Western Ghats, JGR Atmosphere, 1-31.
7. Seela, Balaji K., Jayalakshmi Janapati, C.K. Unnikrishnan, Pay-Liam Lin, Jui Le Loh, Wei-Yu Chang, Utpal Kumar, K. K. Reddy, Dong-In Lee, and Mannem Venkatrami Reddy (2021), Raindrop Size Distributions of North Indian Ocean Tropical Cyclones Observed at the Coastal and Inland Stations in South India. Remote Sensing 13, no. 16: 3178.
8. Jayalakshmi, J., B. K. Seela, P.L. Lin, P.K. Wang, C.H. Tseng, K. K. Reddy, H. Hashiguchi, L. Feng, S. K. Das, and C.K. Unnikrishnan (2020) Raindrop size distribution characteristics of Indian and Pacific Ocean tropical cyclones observed at India and Taiwan sites. Journal of the Meteorological Society of Japan, Vol.98, pp: 1-21.
9. R.K.Sumesh, E.A.Resmi, C.K. Unnikrishnan, DharmadasJash, T.S.Sreekanth, M.C. ResmiMol, K.Rajeevan, S.Nita, K.K.Ramachandran, (2019) Microphysical aspects of tropical rainfall during Bright Band events at mid and high-altitude regions over Southern Western Ghats, India , Atmospheric Research, Volume 227, ,178-197.
10. D. Jash, EA Resmi, C.K. Unnikrishnan, RK Sumesh, et al., (2019) Variation in rain drop size distribution and rain integral parameters during southwest monsoon over a tropical station: An inter-comparison of disdrometer and Micro Rain Radar, Atmospheric Research, Vol.217, 24-36.
11. Anoop T.R., C.K. Unnikrishnan, Karumuri Ashok, K.K. Ramachandran and T.N. Prakash (2019) South Asian subtropical low-level jet: influence on the regional hydrology and aerosol optical depth, Current Science, September Vol.117, 1-8.
12. C. K. Unnikrishnan and M. Rajeevan(2018) Atmospheric water budget over the South Asian summer monsoon region, Meteorology and Atmospheric Physics, 1-16 .
13. Sumesh R. K, Rajeevan E.A, Resmi, C. K. Unnikrishnan (2017) Particulate Matter Concentrations in the Southern Tip of India: Temporal Variation, Meteorological Influences, and Source Identification, Earth Systems and Environment, 1-13.
14. K Rajeevan, R. K. Sumesh, Resmi E A, C.K. Unnikrishnan (2018) An observational study on the variation of black carbon aerosol and source identification over a tropical station in south India, Atmospheric Pollution Research, 1-15.
15. C.K. Unnikrishnan, BiswadipGharai, Saji Mohandas, Ashu Mamgain, E.N. Rajagopal, G. R. Iyengar and P. V. N Rao (2016) Recent changes on land use/land cover over Indian region and its impact on the weather prediction using Unified model, Atmospheric Science Letters, Vol 17, 4., pp 294-300.
16. C.K. Unnikrishnan, Abhishek Lodh , Devesh Maurya, Swapan Mallick, John P. George, EN Rajagopal and Saji Mohandas (2016) Comparison of two high resolution gridded soil moisture products over India, Journal of Earth System Sciences, Vol.125, 5, pp 935-944.
17. C.K. Unnikrishnan, Ashu M, , E.N Rajagopal (2016) Recent land-use land-cover changes and their impact on the evolution and structure of thunderstorms in New Delhi, Proc. SPIE (Remote Sensing and Modeling of the Atmosphere, Oceans, and Interactions VI),Vol. 9882, doi:10.1117/12.2223602, pp 1-6.
18. C.K. Unnikrishnan, M Rajeevan and S Vijaya Bhaskara Rao (2016) Impact of high resolution land surface initialization in Indian monsoon simulation using a regional climate model, Journal of Earth System Science, Vol.125, 4, pp 677-689.
19. C.K. Unnikrishnan, M Rajeevan and SVB Rao (2015) A study on the role of land-atmosphere coupling on the south Asian monsoon climate variability using a regional climate model, Theoretical and Applied Climatology , 1-16, doi: 10.1007/s00704-015-1680-y.
20. C.K. Unnikrishnan, M Rajeevan, S Vijaya Bhaskara Rao and Manoj Kumar, (2013) Development of a High Resolution Land Surface Data set for the South Asian monsoon region, Current Science, Vol 105, 9, pp 1235-1246.
21. M Rajeevan, C.K. Unnikrishnan and Preeti Bhaskar (2012) Evaluation of the ENSEMBLES multimodel seasonal forecasts of Indian summer monsoon variability, Climate Dynamics, Volume 38 1112, 2257-2274.
22. M. Rajeevan, C.K. Unnikrishnan, Jyoti Bhate, K. Niranjan Kumar and P. P. Sreekala (2012) Northeast Monsoon over India: Variability and Prediction, Meteorological Applications, 19, 226– 236, doi: 10.1002/met.1322.
23. Jyoti Bhate, C.K. Unnikrishnan and M. Rajeevan (2012) Regional Climate simulation of the 2009 Indian summer monsoon, Indian Journal of Radio and Space Physics (ISSN: 0367-8393), Vol. 41, Aug 2012, 488-500.
24. M. Rajeevan, P. Rohini, K. Niranjan Kumar, J. Srinivasan and C.K. Unnikrishnan (2013) A study of vertical cloud structure of the Indian summer monsoon using CloudSat data, Climate Dynamics, Volume 40, Issue 3-4, pp 637-650.

Book/Monographs/Chapters/Edited Volumes:

• Northeast Monsoon of South Asia: Meteorological Monograph, Authors: Rajeevan, M., Mohapatra, M., Unnikrishnan, C. K., Geetha, B., et al., 2022. India Meteorological Department, New Delhi, Issue No. MoES/IMD/Synoptic Met/02(2022)/27,1-224.
• Unnikrishnan C.K. and E. N. Rajagopal, NCMRWF Internal Technical Report, 2016: Documentation of the Land Surface Scheme in NCMRWF Unified Model, NMRF/TR/11/2016, pp 1-45.
• M Rajeevan, Amit Kesarkar, Jyoti Bhate, Unnikrishnan C.K., and M.Venkatratnam, 2010: Skill of short-range forecasts for vertical profile of winds over the SHAR region: A brief report, National Atmospheric Research Laboratory, Dept. of Space, Gadanki, Research Report No NARL/WCRG/1/2010.
• M. Rajeevan, Amit Kesarkar, Jyoti Bhate, Unnikrishnan C.K., Madhu Latha, and Sreeram Mahesh, 2009: Development of a Real Time Short-range Weather Forecasting System and its Verification during the 2009 Southwest Monsoon Season, WCRG report, National Atmospheric Research Laboratory, Dept. of Space, and Research Report No. NARL/WCRG/2/2009.

Conferences/Seminars/Symposia:

1. Unnikrishnan CK :"Emerging trends and changes on convective weather systems" at National Seminar on 18 February 2025 at Calicut University, Kerala (Invited Talk).
2. Abhinav Kumar Shukla and Unnikrishnan CK : ‘Spatial and temporal dynamics of cloud-to-ground and intra-cloud lightning in southern India at 37th Kerala Science Congress, 2025 (Received Best Paper Award).
3. Malavika G R*, Unnikrishnan CK : "Tropical Cloud to Ground and Intra-Cloud Lightning Activity in a lightning hotspot" National Conference on Women in Geosciences: Opportunities, Challenges and Accomplishments, National Conference Geosciences 2024.
4. Unnikrishnan C.K., Malavika G R, Mobin Raj VC, V Gopalakrishnan, Sunil Pawar, Anusha Andrews: A Study on Deep Neural Networks model for lightning forecasting in the Tropical South Asian Region, AGU Annual Meeting 2023, Los Angeles, California, USA..
5. Unnikrishnan C.K., M Rajeevan, Changes in North East Monsoon over South Asia, 104th AMS Annual Meeting - 37th Conference on Climate Variability and Change, January 2024, Baltimore, Maryland, USA.
6. Unnikrishnan CK : Centre for Water Resources Development and Management (CWRDM) KSCSTE training on "Lightning and Thunderstorms in Kerala " 27 January 2023. (Invited Talk).
7. Unnikrishnan CK : National symposium on WMO day 23 March 2023 about lightning hotspots in India.
8. Unnikrishnan CK : “A study on lightning activity in south India using satellite and ground observations at International Symposium on Tropical Meteorology (INTROMET2021) conference during 23-26 November 2021.
9. Unnikrishnan CK : A study on cloud cover in reanalysis datasets in tropical south India, European Geosciences Union (EGU) Annual Meeting 2020 .
10. Unnikrishnan CK : On observational aspects of a tropical extreme rainfall event, Asia Oceania Geosciences Society Meeting 2019, Singapore.
11. Unnikrishnan CK : Cloud cover and Cloud base height in the south west coast and Western Ghats. International Symposium on Tropical Meteorology- 2017, ISRO, Ahmadabad, India .
12. Unnikrishnan CK: “The relationship between Sea Surface Temperature and Surface Latent-Sensible heat flux in Central India, OSICON-2017 .
13. Unnikrishnan CK: Climate change and Ozone protection” in VHSS Vithura Kerala on 23 September 2017. (Invited Talk).