आईआईटीएम
IITM

Ongoing International Projects:

• Principal Investigator for the project ‘Artificial Intelligence and Earth System Modelling toward Detection of Extreme Climate Events in the BRICS (2023-2026), BRICS STI Framework Program, along with PIs Dr Paulo Nobre, Brazil and Prof. LIN Zhaohui, China)

Advising:

Doctoral students: Primary advisor for Sumit K. M. Tiasha D and co-advisor for Kalik V, Gokul T. and M. Singh

M.Sc students: Primary advisor for Tiasha Dev, Divya V., Sneha P., Prashant P.

Referee of Scientific Journals: Climate Dynamics, Journal of Climate, Geophysical Research Letters, Scientific Online Letters on the Atmosphere, International Journal of Climatology etc.

Publications in standard refereed journals

1. Krishnan R., Dhara C., Horinouchi T., Gonzales C.K.G., Dimri A.P., Shrestha M.S., Swapna P., Roxy M.K., Son S.W., Ayantika D.C., Cruz F.A.T., Qiao F., Compound weather and climate extremes in the Asian region: Science informed recommendations for policy, Frontiers in Climate, 6, November 2024, DOI:10.3389/fclim.2024.1504475
2. Bhowmik M., Ayantika D.C., Swapna P., Hazra A., Krishnan R., Advancing effective radius parameterizations in climate models: insights from fundamental theoretical studies and CMIP6 model, Climate Dynamics, 63: 7, January 2025, DOI:10.1007/s00382-024-07500-y, 1-16
3. Kalik V., Krishnan R., Ayantika D.C., Swapna P., Singh Manmeet, Sandeep N., Vellore R., Rao V.B., Understanding the response of tropical overturning circulations to greenhouse gas and aerosol forcing, Environmental Research: Climate, 3, August 2024, DOI:10.1088/2752-5295/ad6f3c, 1-20
4. Ayantika, D. C., Sumit, K. M., Krishnan, R., Vellore, R., & Guhathakurta, P., 2024. A mechanistic investigation into the unusual intensification of rainfall over Western India during the 2019 summer monsoon. Atmospheric Research, 299, 107209
5. Gokul, T., Vellore, R. K., Ayantika, D. C., Divya, V., Krishnan, R., & Reji, M. J. K., 2023. Low clouds over the subtropical Indian Ocean and sub-seasonal circulation associations with the Indian summer monsoon. Climate Dynamics, 1-38
6. Gokul, T., Vellore, R.K., Ayantika D. C., Krishnan, R., Hingmire, D., 2022. Sensitivity to PBL parameterizations on the marine layer cloud simulations in the southern Indian Ocean. Meteorology and Atmospheric Physics, 134, 56. https://doi.org/10.1007/s00703-022-00889-3
7. Hingmire, D., Vellore, R., Krishnan, R. Manmeet Singh, A Metya, T Gokul,  Ayantika D. C., 2022. Climate change response in wintertime widespread fog conditions over the Indo-Gangetic Plains. Climate Dynamics, 58, 2745–2766. https://doi.org/10.1007/s00382-021-06030-1
8. Sandeep, N., Swapna, P., Krishnan, R., Farneti, R, Kucharski, F., Modi Aditi, Prajeesh, A. G., Ayantika D. C., & Manmeet, S., 2022 On the weakening association between South Asian Monsoon and Atlantic Multidecadal Oscillation. Climate Dynamics, 59, 2531–2547. https://doi.org/10.1007/s00382-022-06224-1
9. Ramarao, M., Ayantika D. C., Krishnan, R., Sanjay, J., Sabin, T., Mujumdar, M., & Singh, K., 2023. Signatures of aerosol-induced decline in evapotranspiration over the Indo-Gangetic Plain during the recent decades. MAUSAM, 74(2), 297–310. https://doi.org/10.54302/mausam.v74i2.6031
10. Roy, C., Rathod, S. D., & Ayantika, D. C., 2023. NOx-induced changes in upper tropospheric O3 during the Asian summer monsoon in present-day and future climate. Geophysical Research Letters, 50, e2022GL101439,.  https://doi.org/10.1029/2022GL101439 
11. Swapna, P., Sreeraj, P., Sandeep, N., Jyoti, J., Krishnan, R., Prajeesh, A.G., Ayantika, D. C. and Manmeet, S., 2022. Increasing frequency of extremely severe cyclonic storms in the North Indian Ocean by anthropogenic warming and southwest monsoon weakening. Geophysical Research Letters, 49(3), p. e2021GL094650.
12. Prajeesh, A.G., Swapna, P., Krishnan, R., Ayantika, D.C., Sandeep, N., Manmeet, S., Aditi, M. and Sandip, I., 2022. “The Indian Summer Monsoon and Indian Ocean Dipole Connection in the IITM Earth System Model (IITM-ESM).” Climate Dynamics 58 (5): 1877–97. https://doi.org/10.1007/s00382-021-05999-z.
13. Singh, B.B., Krishnan, R., Ayantika, D.C., Vellore, R.K., Sabin, T.P., Kumar, K.R., Brunamonti, S., Hanumanthu, S., Jorge, T., Oelsner, P. and Sonbawne, S., 2021. Linkage of water vapor distribution in the lower stratosphere to organized Asian summer monsoon convection. Climate dynamics, 57(7), pp.1709-1731.
14. Ayantika, D. C., R Krishnan, M Singh, P Swapna, N Sandeep, A G Prajeesh, and R Vellore. 2021. “Understanding the Combined Effects of Global Warming and Anthropogenic Aerosol Forcing on the South Asian Monsoon.” Climate Dynamics 56 (5): 1643–62. https://doi.org/10.1007/s00382-020-05551-5.
15. Biswas, M.S. and Ayantika, D.C., 2021. Impact of COVID-19 Control Measures on Trace Gases (NO2, HCHO and SO2) and Aerosols over India during Pre-monsoon of 2020. Aerosol and Air Quality Research, 21(1), p.200306.
16. Singh, M, R Krishnan, B Goswami, Ayantika Dey Choudhury, P Swapna, R Vellore, A G Prajeesh, et al. 2020. “Fingerprint of Volcanic Forcing on the ENSO Indian Monsoon Coupling.” Science Advances 6 (38): eaba8164. https://doi.org/10.1126/sciadv.aba8164.
17. Sandeep, N., Swapna, P., Krishnan, R., Farneti, R., Prajeesh, A.G., Ayantika, D.C. and Manmeet, S., 2020. South Asian monsoon response to weakening of Atlantic meridional overturning circulation in a warming climate. Climate dynamics, 54, pp.3507-3524.
18. Umakanth, Uppara, Ramesh K Vellore, R Krishnan, Ayantika Dey Choudhury, Jagat S H Bisht, Giorgia Di Capua, Dim Coumou, and Reik V Donner. 2019. “Meridionally Extending Anomalous Wave Train over Asia During Breaks in the Indian Summer Monsoon.” Earth Systems and Environment 3 (3): 353–66. https://doi.org/10.1007/s41748-019-00119-8.
19. Choudhury, Ayantika Dey, R Krishnan, M V S Ramarao, R Vellore, M Singh, and B Mapes. 2018. “A Phenomenological Paradigm for Midtropospheric Cyclogenesis in the Indian Summer Monsoon.” Journal of the Atmospheric Sciences 75 (9): 2931–54. https://doi.org/10.1175/JAS-D-17-0356.1.
20. Swapna, P., Krishnan, R., Sandeep, N., Prajeesh, A.G., Ayantika, D.C., Manmeet, S. and Vellore, R., 2018. Long‐term climate simulations using the IITM Earth system model (IITM‐ESMv2) with focus on the south Asian monsoon. Journal of Advances in Modeling Earth Systems, 10(5), pp.1127-1149.
21. Fadnavis, S., Roy, C., Sabin, T.P., Ayantika, D.C. and Ashok, K., 2017. Potential modulations of pre-monsoon aerosols during El Niño: impact on Indian summer monsoon. Climate Dynamics, 49, pp.2279-2290. https://doi.org/10.1007/s00382-016-3451-6.
22. Roy, C., Fadnavis, S., Müller, R., Ayantika, D.C., Ploeger, F. and Rap, A., 2017. Influence of enhanced Asian NO x emissions on ozone in the upper troposphere and lower stratosphere in chemistry–climate model simulations. Atmospheric Chemistry and Physics, 17(2), pp.1297-1311. https://doi.org/10.5194/acp-17-1297-2017.
23.  Alvim, Débora Souza, Jayant Pendharkar, Vinicius Buscioli Capistrano, Ariane Frassoni, Diego Pereira Enoré, Otacílio Leandro de Menezes Neto, Enver Ramirez Gutierrez, Ayantika Dey Choudhury et al. 2017. “Aerosol Distribution over Brazil with ECHAM-HAM and CAM5-MAM3 Simulations and Its Comparison with Ground-Based and Satellite Data.” Atmospheric Pollution Research 8 (4): 718–28. https://doi.org/https://doi.org/10.1016/j.apr.2017.01.008
24. Vellore, Ramesh K., R. Krishnan, Jayant Pendharkar, Ayantika Dey Choudhury, and T. P. Sabin. 2014. “On the Anomalous Precipitation Enhancement over the Himalayan Foothills during Monsoon Breaks.” Climate Dynamics 43, 2009–2031. https://doi.org/10.1007/s00382-013-2024-1.
25. Rahul, P.R.C., Bhawar, R.L., Ayantika, D.C., Panicker, A.S., Safai, P.D., Tharaprabhakaran, V., Padmakumari, B. and Raju, M.P., 2014. Double blanket effect caused by two layers of black carbon aerosols escalates warming in the Brahmaputra River Valley. Scientific reports, 4(1), p.3670.
26. Sanap, S.D., Ayantika, D.C., Pandithurai, G. and Niranjan, K., 2014. Assessment of the aerosol distribution over Indian subcontinent in CMIP5 models. Atmospheric Environment, 87, pp 123-137, https://doi.org/https://doi.org/10.1016/j.atmosenv.2014.01.017.
27. Krishnan, R., Sabin, T.P., Ayantika, D.C., Kitoh, A., Sugi, M., Murakami, H., Turner, A.G., Slingo, J.M. and Rajendran, K., 2013. Will the South Asian monsoon overturning circulation stabilize any further?. Climate dynamics, 40, pp.187-211. https://doi.org/10.1007/s00382-012-1317-0.
28. Choudhury, Ayantika Dey, and R. Krishnan. 2011. “Dynamical Response of the South Asian Monsoon Trough to Latent Heating from Stratiform and Convective Precipitation.” Journal of the Atmospheric Sciences 68, 6 : 1347-63. https://doi.org/10.1175/2011JAS3705.1.
29. Krishnan, R., Ayantika, D.C., Kumar, V. and Pokhrel, S., 2011. The long‐lived monsoon depressions of 2006 and their linkage with the Indian Ocean Dipole. International Journal of Climatology, 31(9), pp.1334-1352 https://doi.org/https://doi.org/10.1002/joc.2156.
30. Krishnan, R., Sundaram, S., Swapna, P., Kumar, V., Ayantika, D.C. and Mujumdar, M., 2011. The crucial role of ocean–atmosphere coupling on the Indian monsoon anomalous response during dipole events. Climate Dynamics, 37, pp.1-17. https://doi.org/10.1007/s00382-010-0830-2.
31. Sundaram, Suchithra, R Krishnan, Ayantika Dey, and P Swapna. 2010. “Dynamics of Intensification of the Boreal Summer Monsoon Flow during IOD Events.” Meteorology and Atmospheric Physics 107 (1): 17–31. https://doi.org/10.1007/s00703-010-0066-z.
32. Vaid B. H., Gnanaseelan C., Thompson B., Ayantika Dey and Salvekar P. S., (2006): ‘Indian Ocean dipoles observed in Topex/Poseidon altimetry data‘, Journal of Indian Geophysical Union, 10, 101-117  

List of the Book Chapters/ Technical Reports/ Review Articles

1. Ayantika D. C., Sumit K. M., Tiasha D., Krishnan R., Roy C., and Vellore R. (accepted for publication 2024): The warming climate and the changing characteristics of heavy precipitating mid-tropospheric convective systems over Western India, in the book titled ‘Multi-Scale Precipitation Variability Over the Tropics’, Elsevier.
2. Krishnan R, Kalik V., Ayantika D. C., Sumit M.,Vellore R. (2024): Climate change and monsoon rainstorms, in Monograph on “Severe Storms: Anatomy, Early Warning Systems and Aftermath in Changing Climate Scenarios”, Singapore: Springer;
3. Roy, C., Ayantika, D.C., Girach, I. and Chakrabarty, C., 2022. Intense biomass burning over northern India and its impact on air quality, chemistry and climate. In Extremes in Atmospheric Processes and Phenomenon: Assessment, Impacts and Mitigation (pp. 169-204). Singapore: Springer Nature Singapore
4. S. Fadanvis, A. Mahajan, Choudhury Ayantika Dey., C. Roy, M. Singh, M. S. Biswas, (2020): Atmospheric Aerosols and Trace Gases, Chapter 5: in Krishnan R, Sanjay J, Gnanaseelan C et al (eds) BT—Assessment of climate change over the Indian Region: a report of the Ministry of Earth Sciences (MoES), Government of India. Springer, Singapore.
5. Krishnan R, Gnanaseelan C, Sanjay J., Swapna P, Chirag Dhara, TP Sabin, Jyoti Jadhav, N Sandeep, Ayantika Dey Choudhury, et al, (2020): Introduction to climate change over the Indian Region, Chapter 1: in Krishnan R, Sanjay J, Gnanaseelan C et al (eds) BT—Assessment of climate change over the Indian Region: a report of the Ministry of Earth Sciences (MoES), Government of India. Springer, Singapore.
6. R. Krishnan, T.P. Sabin, Aswin Sagar, P. Swapna, Ayantika Dey Choudhury, (2020): South Asian Monsoon Climate Change Projections, Cliver Exchanges, No 79, November 2020, DOI: doi.org/10.36071/clivar.79.2020
7. R Krishnan, P Swapna, Ramesh Vellore, Sandeep Narayanasetti, AG Prajeesh, Ayantika Dey Choudhury, et al., (2019): The IITM Earth System Model (ESM): Development and Future Roadmap. In: Randall D., Srinivasan J., Nanjundiah R., Mukhopadhyay P. (eds) Current Trends in the Representation of Physical Processes in Weather and Climate Models. Springer Atmospheric Sciences. Springer, Singapore.
8. R.Krishnan, P Swapna, Ayantika Dey Choudhury, Sandeep Narayansetti, A. G. Prajeesh, Manmeet Singh, Aditi Modi, Roxy Matthew Koll, Ramesh Vellore, J. Jyoti, T.P. Sabin, J. Sanjay and S. Ingle (2017): The IITM Earth System Model, in: Dr. R. Krishnan and Dr. J. Sanjay (eds), "Climate Change over India" - an interim report released on the occasion of Foundation Day of Ministry of Earth Sciences in New Delhi on 27 July 2017
9. R. Krishnan, Dey Choudhury Ayantika, R. Chattopadhyay and M. Mujumdar (2012): Monsoon simulation. Monsoon Monograph (Volume 2), India Meteorological Department.