Research Experience:

• July, 2022 – Present: Neutral Atmosphere Scientist, British Antarctic Survey (BAS), Cambridge, United Kingdom
• November, 2021 – June, 2022: Research Associate, Space Physics Laboratory (SPL), Vikram Sarabhai Space Centre (VSSC), Indian Space Research Organisation (ISRO), Thirivananthapuram, Kerala, India
• September, 2020 – February, 2021: Visiting Postdoctoral Fellow under mentorship of Dr. Anne K. Smith, senior scientist, Atmospheric Chemistry Observations and Modeling (ACOM) laboratory, National Centre for Atmospheric Research (NCAR), University Corporation for Atmospheric Research (UCAR), Boulder, CO, USA, https://www2.acom.ucar.edu/visitor/karanam-ramesh
• September, 2018 – September, 2020: NASA Living With a Star (LWS) Jack Eddy Postdoctoral Fellow under mentorship of Dr. Anne K. Smith, senior scientist, ACOM laboratory, (also collaborated with Dr. Rolando R Garcia and Dr. Daniel R Marsh, senior scientists), National Centre for Atmospheric Research (NCAR), University Corporation for Atmospheric Research (UCAR), Boulder, CO, USA
  https://cpaess.ucar.edu/heliophysics/jack-eddy/alumni-2018
• September, 2015 – August, 2018: Research Associate, National Atmospheric Research Laboratory (NARL), Department of Space, Gadanki, India
• July, 2010 – May, 2015: Research Scholar at Department of Physics, Sri Venkateswara University, Tirupati and National Atmospheric Research Laboratory (NARL), Gadanki, Andhra Pradesh, India

Research interests

• Lower and middle atmosphere coupling through radiative, dynamical and chemical processes – middle atmosphere and MLT (mesosphere and lower thermosphere) modelling
• Long-term trends and variabilities in middle atmosphere from observations and model simulations – Whole Atmosphere Community Climate Model (WACCM)
• Middle Atmospheric dynamics- Gravity waves, Planetary waves, Tides- general circulations- SAO, QBO, SSW, MIL- latitudinal coupling
• Aeronomy of middle and upper atmosphere – chemical heating through exothermic reactions – NO and CO2 cooling/heating – long term trends in the lower, middle and upper atmosphere T, O3 , CO2 and H2O in consequence of greenhouse effect- Impact of middle atmosphere climate changes on lower atmosphere
• Solar influence on the middle and upper atmosphere energetics, dynamics and chemistry
• Optical Laser Remote sensing (LIDAR) – Mie, Rayleigh, Rayleigh Doppler Lidar, Na Lidar, Fabry Perot Interferometery-Mesospheric Inversion Layers (MILs) – MF/Meteor radar winds for MLT dynamics – MTI (Mesosphere, Thermosphere, Ionosphere) coupling
• EPP (Energetic Particle Precipitation) effects on middle and upper atmosphere composition and chemistry – Geomagnetic storm effects on middle and upper atmosphere
• Influence of PMCs/NLCs (Polar Mesospheric Clouds/ Noctilucent clouds) on middle and lower atmospheric energy budget

Collaborations

• University of Bath, Bath, UK
• National Centre for Atmospheric Research (NCAR), Boulder, Colorado, USA
• National Atmospheric Research Laboratory (NARL), Gadanki, India
• Space Physics Laboratory (SPL), Vikram Sarabhai Space Centre (VSSC), Indian Space Research Organisation (ISRO), Trivandrum, India

List of Publications

• https://www.researchgate.net/profile/Dr_K_Ramesh
• https://scholar.google.co.in/citations?user=nr8Nd7wAAAAJ&hl=en
• http://orcid.org/0000-0001-5642-8864

1. Ramesh, K., Mitchell, N. J., Hindley, N. P., & Moffat-Griffin, T. (2025). Long-term variability and tendencies of the semidiurnal tide in mesosphere and lower thermosphere from meteor radar observations over Esrange (67.9°N, 21.1°E). Journal of Geophysical Research: Atmospheres, 130, e2024JD043134. https://doi.org/10.1029/2024JD043134
2. Ramesh, K., Mitchell, N. J., Hindley, N. P., & Moffat-Griffin, T. (2024), Long-term variability and tendencies in mesosphere and lower thermosphere winds from meteor radar observations over Esrange (67.9°N, 21.1°E). Journal of Geophysical Research: Atmospheres, 129, e2023JD040404.  https://doi.org/10.1029/2023JD040404
3. Ramesh, K., Anne K. Smith, (2021), Long-Term Variability and Tendencies in Nonmigrating Diurnal Tide from WACCM6 Simulations during 1850-2014, Journal of Geophysial Research: Space Physics, 126, e2020JA028904, https://doi.org/10.1029/2020JA028904
   https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2020JA028904
4. Ramesh, K., Anne K. Smith, Rolando R. Garcia, Daniel R. Marsh, S. Sridharan, K.Kishore Kumar (2020), Long-Term Variability and Tendencies in Middle Atmosphere Temperature and Zonal Wind from WACCM6 Simulations during 1850-2014, Journal of Geophysical Research: Atmospheres, 125, 1-20, e2020JD033579, https://doi.org/10.1029/2020JD033579
   https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2020JD033579
5. Ramesh, K., Anne K. Smith, Rolando R. Garcia, Daniel R. Marsh, S. Sridharan, K. Kishore Kumar (2020), Long-Term Variability and Tendencies in Migrating Diurnal Tide from WACCM6 Simulations during 1850-2014, Journal of Geophysical Research: Atmospheres, 125, 1-12, e2020JD033644, https://doi.org/10.1029/2020JD033644, https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JD033644
6. Ramesh, K., S. Sridharan, K. Raghunath (2020), A Comprehensive Study on Tropical (10°N-15°N) Mesospheric Inversion Layers Using Lidar and Satellite (TIMEDSABER) Observations, The European Physical Journal Conferences, 237, 04001, https://doi.org/10.1051/epjconf/202023704001 . https://www.epjconferences.org/articles/epjconf/abs/2020/13/epjconf_ilrc292020_04001/epjconf_ilrc292020_04001.html
7. Ramesh, K., and S. Sridharan (2018), Long-term trends in tropical (10°N–15°N) middle atmosphere (40–110 km) CO2 cooling, Journal of Geophysical Research: Space Physics, 123, 5661– 5673, https://doi.org/10.1029/2017JA025060
   https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2017JA025060
8. Ramesh, K., S. Sridharan, K. Raghunath (2018), Rayleigh lidar observation of tropical mesospheric inversion layer: a comparison between dynamics and chemistry, The European Physical Journal Conferences, 176(D19):03003, 1-4, DOI: 10.1051/epjconf/201817603003
   https://www.epjonferences.org/articles/epjconf/abs/2018/11/epjconf_ilrc28_03003/epjconf_ilrc28_03003.html
9. Ramesh, K., S. Sridharan, K. Raghunath, S. Vijaya Bhaskara Rao (2017), A Chemical Perspective of Day and Night Tropical (10°N-15°N) Mesospheric Inversion Layers, Journal of Geophysical Research: Space Physics, 122, 3650-3664, doi:10.1002/2016JA023721 (Featured article)
   http://onlinelibrary.wiley.com/doi/10.1002/2016JA023721/epdf
10. Ramesh, K., S. Sridharan, (2016), Lidar application to middle atmospheric dynamics, Proc. SPIE 9879, Lidar Remote Sensing for Environmental Monitoring XV,98790L, doi:10.1117/12.2223668, http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2521488
11. Ramesh, K., S. Sridharan, and S. Vijaya Bhaskara Rao (2015), Influence of solar cycle and cycle and chemistry on tropical (10°N-15°N) mesopause variabilities, Journal of Geophysical Research: Space Physics, 120, 4038-4051, doi: 10.1002/2014JA020930
    http://onlinelibrary.wiley.com/doi/10.1002/2014JA020930/pdf
12. Ramesh, K., S. Sridharan, and S. Vijaya Bhaskara Rao (2014), Causative mechanisms for the occurrence of a triple layered mesospheric inversion event over low latitudes, Journal of Geophysical Research: Space Physics, 119, 3930-3943, doi:10.1002/2013JA019750
    http://onlinelibrary.wiley.com/doi/10.1002/2013JA019750/full
13. Ramesh, K., S. Sridharan, S. Vijaya Bhaskara Rao, K. Raghunath, and Y. Bhavani Kumar (2014), Rayleigh lidar observations of mesospheric inversion layers over Gadanki (13.5°N, 79.2°E) and their relationship with gravity wave activity, Indian Journal of Radio & Space Physics, 43, 83-90 http://nopr.niscair.res.in/handle/123456789/27163
14. Ramesh, K., S. Sridharan, K. Raghunath, S. Vijaya Bhaskara Rao, and Y. Bhavani Kumar (2013), Planetary wave – gravity wave interactions during mesospheric inversion layer events, Journal of Geophysical Research: Space Physics, 118, 4503-4515, doi:10.1002/jgra.50379
    http://onlinelibrary.wiley.com/doi/10.1002/jgra.50379/full
15. Ramesh, K., S. Sridharan, and S. Vijaya Bhaskara Rao (2013), Dominance of chemical heating over dynamics in causing a few large mesospheric inversion layer events during January- February 2011, Journal of Geophysical Research: Space Physics, 118,
    6751-6765, doi: 10.1002/jgra.50601, http://onlinelibrary.wiley.com/doi/10.1002/jgra.50601/full
16. Sridharan, S., M. Suresh and K. Ramesh, VHF radar observations of mesospheric echoes and their relationship with thermal structure over Gadanki (13.5°N, 79.2°E) (2013), Indian Journal of Radio & Space Physics, 42, 364-370,http://nopr.niscair.res.in/handle/123456789/22862
17. Ramesh, K., and S. Sridharan (2012), Large mesospheric inversion layer due to breaking of small- scale gravity waves: Evidence from Rayleigh lidar observations over Gadanki (13.5 ̊N, 79.2 ̊E), Journal of Atmospheric and Solar Terrestrial Physics, 89, 90-97, doi:10.1016/j.jastp.2012.08.011
    http://www.sciencedirect.com/science/article/pii/S1364682612002179
18. Raghunath Karnam, Karnam Ramesh, and Sanama Narayana Reddy, Fabry– Perot interferometer as a solar background noise suppressor: application to daytime lidar (2012), Annals of Geophysics, 55, 2, 215-222, doi: 10.4401/ag- 4947
    http://www.annalsofgeophysics.eu/index.php/annals/article/view/4947
19. Raghunath, K., D.V. Abhinava Karthik, S. Narayana Reddy, and K. Ramesh (2011), Development of calibration scheme and software for Doppler Lidar Receiver, International Journal of Engineering Science and Technology, 3, 5702-5708
    http://www.ijest.info/docs/IJEST11-03-07-084.pdf
20. Sridharan, S., K. Ramesh, S. Sathish Kumar, S. Gurubaran, K. Raghunath, Y. Bhavani Kumar, and S. Vijaya Bhaskara Rao (2010), Near simultaneous lidar observations of upper mesospheric inversion layers and sporadic sodium layers over Gadanki (13.5°N,79.2°E), Asian Journal of Physics, 19, 13-18
    http://asianjournalofphysics.in/content2/vol-19-no-4

Publications from NERC Open Research Archive

MesoS2D: Mesospheric Sub-seasonal to Decadal predictability

British Antarctic Survey (BAS), Cambridge, UK

Conference Presentations

• K. Ramesh, Nicholas J. Mitchell, Neil P. Hindley, Tracy Moffat-Griffin (2024), Meteor radar observations of long-term variabilities in arctic mesosphere and lower thermosphere winds over Esrange (67.9°N, 21.1°E), International Symposium on the 40th Anniversary of the MU Radar (MU40), 18-21 November, 2024, Uji Campus, Kyoto University, Kyoto, Japan.
• K. Ramesh, Nicholas J. Mitchell, Neil P. Hindley, Tracy Moffat-Griffin (2024), Long-term and Interannual  Variability of the Semidiurnal Tide in Mesosphere and Lower Thermosphere  from Meteor Radar Observations Over Esrange (67.9°N, 21.1°E), 16th International Workshop on Technical and Scientific Aspects of iMST Radar and Lidar (MST16/iMST3), 9-13 September,  2024, Rostock, Germany.
• K. Ramesh, S. Sridharan, K. Raghunath, S. Vijaya Bhaskara Rao, Y. Bhavani Kumar (2024), Planetary wave-gravity wave interactions during mesospheric inversion layer events over Gadanki (13.5°N, 79.2°E), 16th International Workshop on Technical and Scientific Aspects of iMST Radar and Lidar (MST16/iMST3), 9-13 September,  2024, Rostock, Germany.
• Invited: K. Ramesh, Nicholas J. Mitchell, Neil P. Hindley, Tracy Moffat-Griffin (2024), Long-term Variability and Tendencies in Mesosphere and Lower Thermosphere Winds and Tides from Meteor Radar Observations Over Esrange (67.9°N, 21.1°E), 12^th International Workshop on Long-Term Changes and Trends in the Atmosphere (TRENDS 2024), 06-10 May, 2024, Ourense, Galicia, Spain  (https://trends2024.uvigo.es/#invited-speakers).
• Invited: K. Ramesh, Anne K. Smith, Rolando R. Garcia, Daniel R. Marsh, S. Sridharan, K. Kishore Kumar (2022), Long-Term Variability and Tendencies in Middle Atmosphere Temperature, Zonal Wind and Diurnal Tides from WACCM6 Simulations during 1850-2014, 11th International Workshop on Long-Term Changes and Trends in the Atmosphere (TRENDS 2022), 30 May – 03 June, 2022, Helsinki,
  Finland (http://trends2020.fmi.fi/invited.html).
• K. Ramesh, S. Sridharan, K. Raghunath (2019), A Comprehensive Study on Tropical (10N°-15°N) Mesospheric Inversion Layers Using Lidar and Satellite (TIMEDSABER) Observations, 29th International Laser Radar Conference (ILRC29), 24-28 June, 2019, Hefei, China.
• K. Ramesh and Anne K. Smith (2019), Long-Term Trends in Diurnal Tide from WACCM6 Simulations, 27th International Union of Geodesy and Geophysics (IUGG) General Assembly, 8-18 July, 2019, Montreal, Canada.
• Daniel R. Marsh, Anne K. Smith and K. Ramesh (2019), The Response to Variable Solar Forcing in WACCM Simulations for CMIP6, AGU Fall Meeting, 9-13 December, 2019, SanFrancisco, USA.
• K. Ramesh , S. Sridharan , K. Raghunath (2018), Rayleigh Lidar Observations of Tropical (13.5°N, 79.2°E) Mesospheric Inversion Layers: A Comparison between Dynamics and Chemistry, 19th Coherent Laser Radar Conference (CLRC 2018), 18-21 June, 2018, Okinawa, Japan.
• K. Ramesh , S. Sridharan , K. Raghunath, S. Vijaya Bhaskara Rao (2017), Interaction of Gravity Waves and Planetary Waves during Mesospheric Inversion Layers over Low Latitudes, 3rd International Union of Radio Science (URSI) Regional Conference on Radio Science, 1-4 March 2017, Tirupati, India.
• K. Ramesh and S. Sridharan (2016), LIDAR Application to Middle Atmospheric Dynamics, 10th SPIE Asia-Pacific Remote Sensing Symposium-2016, 4-7 April, 2016, New Delhi, India.
• K. Ramesh, S. Sridharan, and S. Vijaya Bhaskara Rao (2016), Causative Mechanisms of Tropical (10°N-15°N) Mesopause Variabilities, National Space Science Symposium-2016 (NSSS-2016), 9-12 February, 2016 at Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, Kerala, India [Best Paper Award].
• K. Ramesh, S. Sridharan, and S. Vijaya Bhaskara Rao (2016), Solar cycle and chemical influence on Tropical (10°N–15°N) Mesopause variabilities, 9th workshop on long term changes and trends in the atmosphere (Trends 2016), 19- 23 September 2016, Leibniz-Institute of Atmospheric Physics, Kühlungsborn, Germany.
• K. Ramesh, S. Sridharan, and S. Vijaya Bhaskara Rao (2014), Causative Mechanisms of Mesospheric Inversion Layers: Chemistry Vs Dynamics, National Space Science Symposium- 2014 (NSSS-2014), 29 January-01 February 2014 at Dibrugarh University, Dibrugarh, Assam, India [Best Paper Award].
• K. Ramesh, S. Sridharan, S. Vijaya Bhaskara Rao, K. Raghunath and Y. Bhavani Kumar (2012), Role of planetary waves in causing Mesospheric Temperature Inversion Layers, National Space cience Symposium-2012 (NSSS-2012), 14-17 February 2012, Sri Venkateswara University, Tirupati, A.P., India.
• K. Ramesh, S. Sridharan, S. Vijaya Bhaskara Rao, K. Raghunath and Y. Bhavani Kumar (2012), Investigation of a large mesospheric inversion layer event over Gadanki (13.5°N, 79.2°E):Relative role of planetary wave and gravity wave breaking, 5th A.P. Science Congress, 14-16 November 2012, Acharya Nagarjuna University, Guntur, A.P., India.
• K. Ramesh, S. Sridharan, S. Vijaya Bhaskara Rao, K. Raghunath and Y. Bhavani Kumar (2012), Investigation of a large Mesospheric Inversion Layer event over Gadanki (13.5°N, 79.2°E): Role of Gravity waves and Planetary Waves, Current trends in Atmospheric Research including Communication And Navigation aspects2012 (CARCAN-2012), 21-22 December 2012, Vignana Bharathi Institute of Technology (VBIT), Hyderabad, A.P., India.
• K. Raghunath, A. Jayaraman, K. Ramesh, S. Narayana Reddy, “Lidar observations of Atmospheric Winds”, National Space Science Symposium-2012 (NSSS-2012), 14-17 February 2012, Sri Venkateswara University, Tirupati, A.P., India.
• Attended for 39th COSPAR Scientific Assembly, 14-22 July 2012, Mysore, Karnataka, India [under ISRO student sponsored program].
• K. Ramesh, S. Sridharan, S. Vijaya Bhaskara Rao, K. Raghunath and Y. Bhavani Kumar (2011), Enhanced gravity wave growth and breaking on nights of mesospheric inversion layers: Evidence from Rayleigh lidar observations at Gadanki (13.5°N, 79.2°E), National Conference on Advances in Atmospheric Remote Sensing, Weather Prediction & Climate Change (ARWPCC-2011), 10-11 March 2011, Sri Venkateswara University, Tirupati, A.P., India.
• K. Raghunath, K. Ramesh and A. Jayaraman (2011), Doppler Lidar for Tropospheric wind observations, International Conference on Contemporary Trends in Optics and Optoelectronics, 17-19 January 2011, Indian Institute of Space Science and Technology, Thiruvananthapuram, Kerala, India.
• K. Raghunath, K. Ramesh, A. Jayaraman, S. Narayana Reddy (2011), “Atmospheric wind observations with Laser Radar”, Proceedings of 8th International Radar Symposium held during 01-04, December 2011 at Bangalore, India

• Reviewer for Journal of Geophysical Research: Space Physics , American Geophysical Union
• Reviewer for Journal of Geophysical Research: Atmospheres, American Geophysical Union
• Reviewer for Geophysical Research Letters, American Geophysical Union
• Reviewer for Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) , Elsevier