JAYASANKAR C B, Ph.D.


Research Publications Reports Conferences Talks Awards Op-Eds
Jayasankar C B

I am a researcher aimed to understand climate change projections at regional scale. It is important to know the possible future changes in mean and extremes of Indian summer monsoon (ISM) due to global warming which has an immense impact on the agricultural production, livelihood of farmers and the economy of India. I try to quantify the projected future changes in mean and extremes of the ISM at the local scale using high-resolution regional climate model. Expert knowledge in WRF-ARW model for weather/climate applications and CAMx chemical transport model for dispersion modelling. Gained extensive experience in porting and running numerical models in the high performance computing (HPC) environment and handling large volumes of datasets.

Advisor:  Vasubandhu Misra


Contact me at jcb@fsu.edu

Research

I am broadly interested in Regional and Global Climate Modelling, Climate Change Projections, High-resolution Dynamical Downscaling, Extreme Events, Monsoon and its Variability, Atmospheric Aerosols-Climate Interactions, Air Pollution Modelling. Some research are highlighted below.

Reliable Climate Change Projections Over India Through Dynamical Downscaling Using Very High-resolution Regional Climate Model

Ph.D. Thesis Jayasankar C B
Academy of Scientific & Innovative Research (AcSIR), & CSIR Fourth Paradigm Institute (CSIR-4PI), India. 2019

Advisor:  Dr. K. Rajendran

In this study, we dynamically downscaled an appropriate General Circulation Model (GCM) outputs using a skilful, reliable very high-resolution Regional Climate Model (RCM) of Weather Research and Forecasting-Advanced Research Weather Research and Forecasting (WRF-ARW) to simulate Indian summer monsoon (ISM) and to obtain reliable climate change projection over India and it's orographic west coast. The analysis of the projected changes in mean and extreme events over India and ecologically sensitive, densely populated west coast were carried out after a detailed evaluation of the present-day simulation of ISM by this high-resolution RCM. This high-resolution model with 3-km resolution over WG region resolves orographic features enabling realistic simulation of physical and dynamical characteristics of present-day Indian summer monsoon (ISM) and extreme events over WG, in particular the recent trends in ISM rainfall as observed. Present study establishes the importance of (i) employing skilful high-resolution model, (ii) use of bias-corrected boundary data sets and (iii) configuring model for realistic present-day climate over complex topographic coastlines such as the west coast of India, in order to achieve useful climate change projection information. These climate projections can be effectively used for decision making and adaptation measures in various sectors such as agriculture, hydrology and power generation.

Publications



Gap-free 16-year (2005–2020) sub-diurnal surface meteorological observations across Florida
Julie A Peeling, Jasmeet Judge, Vasubandhu Misra, C B Jayasankar, William R Lusher
Nature Scientific Data, 10 (907), 2023
PDF | DOI

Characterizing the Madden–Julian Oscillation in the western Pacific Ocean from a regional coupled ocean–atmosphere model simulation
Vasubandhu Misra, C B Jayasankar
Quarterly Journal of the Royal Meteorological Society, DOI: 10.1002/qj.4620, 2023
PDF | DOI

Heat waves in Florida and their future from high-resolution regional climate model integrations
Parker Beasley, Vasubandhu Misra, Jayasankar C B, Amit Bhardwaj
International Journal of Climatology, DOI: 10.1002/joc.8278, 2023
PDF | DOI

A Comparative Study Between Regional Atmospheric Model Simulations Coupled and Uncoupled to a Regional Ocean Model of the Indian Summer Monsoon
Jayasankar C B*, Vasubandhu Misra, Nirupam Karmakar
Earth and Space Science, 10 (4), e2022EA002733, 2023
PDF | DOI

The Regional Diagnosis of Onset and Demise of the Rainy Season over Tropical and Subtropical Australia
Vasubandhu Misra, Shubham Dixit, C B Jayasankar
AMS Earth Interactions, DOI: 10.1175/EI-D-22-0026.1, 2023
PDF | DOI

A Diagnostic Study of Heavy Rainfall Events in Upper Ganga and Sharda River Basins, India
B. L. Sudeepkumar, C B Jayasankar, B. Lekshmi Mudra, Om Mani Singh
Meteorology and Atmospheric Physics, DOI: 10.1007/s00703-023-00954-5, 2023
PDF | DOI

Dynamic Downscaling the South Asian Summer Monsoon from a Global Reanalysis using a Regional Coupled Ocean-Atmosphere Model
Vasubandhu Misra, C B Jayasankar, A K Mishra, A Mitra, P Murugavel
Journal of Geophysical Research: Atmospheres, DOI: 10.1029/2022JD037490, 2022
PDF | DOI

Operational Monitoring of the Evolution of Rainy Season Over Florida
Vasubandhu Misra, C B Jayasankar, P Beasley, A Bhardwaj
Frontiers in Climate, 4:793959, 2022
PDF | DOI
A high resolution coupled ocean-atmosphere simulation of the regional climate over Central America
Vasubandhu Misra, C B Jayasankar
Climate Dynamics, 1-21, 2022
PDF | DOI
Does increasing the spatial resolution in dynamical downscaling impact climate change projection of Indian summer monsoon, population and GDP?
Jayasankar C B*, K Rajendran, S Surendran
Theoretical and Applied Climatology, 145 (1), 441-453, 2021
PDF | DOI
High‐resolution Climate Change Projection of Northeast Monsoon Rainfall over Peninsular India
Jayasankar C B*, K Rajendran, S Surendran, KV Ajay Anand
Quarterly Journal of the Royal Meteorological Society, 147 (737), 2197-2211, 2021
PDF | DOI
Monsoon Climate Change Projection for the Orographic West Coast of India using High Resolution Nested Dynamical Downscaling Model
Jayasankar C B, K Rajendran, S Surendran
Journal of Geophysical Research: Atmospheres, 123 (15), 7821-7838, 2018
PDF | DOI
Robust signals of future projections of Indian summer monsoon rainfall by IPCC AR5 climate models: Role of seasonal cycle and interannual variability
Jayasankar C B*, S Surendran, K Rajendran
Geophysical Research Letters, 42 (9), 3513-3520, 2015
PDF | DOI
How dependent is climate change projection of Indian summer monsoon rainfall and extreme events on model resolution?
K Rajendran, S Sajani, C B Jayasankar, A Kitoh
Current Science, 104(10), 1409-1418, 2013
PDF | DOI

Reports (Peer-Reviewed)



Emission Inventory and Pollution Reduction Strategies for Bengaluru
Contributors: Anirban Banerjee, C B Jayasankar, Pratima Singh, Udhaya Kumar V
CSTEP, (CSTEP-RR-2022-4), 124pp, 2022
PDF

Conferences/Workshops/Seminars/Proceedings


Dynamic Downscaling the South Asian Summer Monsoon From a Global Reanalysis Using a Regional Coupled Ocean-Atmosphere Model
Vasubandhu Misra, and C B Jayasankar
Presented at EGU General Assembly 2023, EGU23-1014, Vienna, Austria, 24–28 Apr 2023.

Does Air-sea Coupling Improve the Dynamical Downscaling of Indian Summer Monsoon?
Jayasankar C B*, and Vasubandhu Misra
Presented at AMS 35th Conference of Hurricanes and Tropical Meteorology, New Orleans, LA, USA, 09-13 May 2022.

Understanding the Onset and Demise of the West African Summer Monsoon
Alex Boreham, C B Jayasankar, and Vasubandhu Misra
Presented at Undergraduate Research Symposium, Florida State University, FL, USA, 07 April 2022.

High-resolution Climate Change Projection of Indian Summer Monsoon: A Dynamical Downscaling Approach
Jayasankar C B*, K Rajendran, and S Surendran
Presented at Scenarios Forum 2019, University of Denver, Denver, CO, USA, 11-12 March 2019.

CMIP5 Based Climate Projections and Uncertainties over South Asia
K Rajendran, S Surendran and C B Jayasankar
Presented at Seventh National Workshop on "Science of Climate Change and Sustainable Development", NCESS, Thiruvanathapuram, Kerala, India, 19-20 August 2015.

Role of seasonal cycle and interannual variability in future projection of Indian summer monsoon rainfall
K Rajendran, S Surendran, A Kitoh and C B Jayasankar
Presented at LORRI Workshop on Air Pollution and Climate Change in South Asia: Bridging the Science, Imperial College, London, UK, 9 July 2015.

CMIP5 Projections of Changes in Indian Summer Monsoon Rainfall
K Rajendran, S Surendran, and C B Jayasankar
Presented at National Climate Science Conference, DCCC, IISc, Bangalore, India, 2-3 July 2015.

Projected changes in Indian summer monsoon and seasonal cycle
Jayasankar C B*, K Rajendran, and S Surendran
Presented at First Climate Science and Policy Workshop, IIT Bombay, Mumbai, Maharashtra, India, 6-7 March 2014.

Simulation and projection of Indian summer monsoon
Jayasankar C B*, K Rajendran, and S Surendran
Presented at Silver Jubilee International Conference on Computational and Data Intensive Science , CSIR- 4PI, Bangalore, India, 26-28 August 2013.

Projected changes in Indian summer monsoon by CMIP5 simulations
Jayasankar C B*, K Rajendran, and S Surendran
Presented at International workshop on CMIP5 model intercomparisons for future projections of precipitation and climate in Asia , Tsukuba, Ibaraki, Japan, 26-27 March 2013.

Invited Talks


Monitoring and Seasonal Outlook of Florida’s Rainy Season | PDF
Jayasankar C B*, and Vasubandhu Misra
Presented at Florida Water & Climate Alliance Webinar, Florida Water & Climate Alliance, FL, USA, 15 April 2022.

Climate Change and Its Impacts Over Kerala
Jayasankar C B*
Presented at Ozone Day Webinar, Carmel College, Mala, Kerala, India, 20 September 2022.

Climate Change and Its Impacts Over Kerala
Jayasankar C B*
Presented at National Science Day Webinar, Federal Institute of Science and Technology, Angamaly, Kerala, India, 28 February 2023.

High-resolution Climate Change Projections for India Using Nested Dynamical Downscaling Model
Jayasankar C B*
Presented at Alumni Talk Series, Cochin University of Science and Technology, School of Marine Sciences Auditorium, Lake Side Campus, Cochin, India, 07 December 2023.

Introduction to Climate Change and its Impacts over Kerala
Jayasankar C B*
International Seminar, Department of Physics, Yuvakshetra Institute of Management Studies, Ezhakkad, Mundur, Palakkad, India, 19 December 2023.

Selected Awards/Grants


  2022 Postdoc Five Minute Research (5MR) Finalist ($100 Award), Office of Postdoctoral Affairs (OPDA) , Florida State University, FL, USA
  2019 International Travel Support (ITS), Science and Engineering Research Board (SERB), Department of Science & Technology (DST), India
  2013 Visiting student/fellow at Meteorological Research Institute/Japan Meteorological Agency (MRI/JMA), Tsukuba, Japan, (JAMSTEC) [1-30 March]
  2013 Recipient of INSPIRE Fellowship in Earth & Atmospheric Sciences, Department of Science & Technology (DST), New Delhi, India
  2012 University First Rank in M.Sc. Meteorology, Department of Atmospheric Science, Cochin University of Science and Technology, Kerala, India

Quotes in News Articles


Tampa Bay area, Southwest Florida saw driest rainy season in 26 years
Tampa Bay Times, Florida, USA. October 24, 2023 News

Editorials and Op-Eds


Winter Strom and Bomb Cyclone in America
C B Jayasankar
LUCA by Kerala Sasthrasahithya Parishad (KSSP), Kerala. January 2, 2023 Op-Eds
PDF
Climate Change and Kerala
Krishnamohan K S and C B Jayasankar
Mathrubhumi Yearbook Plus 2023 (Malayalam), Kerala. Publisher: Mathrubhumi. December, 2022 Op-Eds
PDF
Link Between Fortran and Weather Prediction
C B Jayasankar
LUCA by Kerala Sasthrasahithya Parishad (KSSP), Kerala. August 2, 2022 Op-Eds
PDF
Thirty-five of the World's Fifty Most Polluted Cities are in India
C B Jayasankar
LUCA by Kerala Sasthrasahithya Parishad (KSSP), Kerala. March 25, 2021 Op-Eds
PDF
La-Nina has Arrived
C B Jayasankar
LUCA by Kerala Sasthrasahithya Parishad (KSSP), Kerala. September 12, 2020 Op-Eds
PDF
Monsoon out of Rhythm and Measure over Kerala; Caution is Advised in the Water Usage
C B Jayasankar
Manorama, Kerala. July 24, 2020 Editorial
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Very thankful to Jon Barron and Akshay Anand for the template.