The topics of my research include:
Autumn monsoons
Decadal climate variability
The role of the ocean in tropical climate, especially ENSO and monsoons
Climate prediction
Impacts of ocean currents on marine ecosystems
Complex systems: data analysis techniques for networks, chaotic dynamics, and machine learning
See below for publications, ongoing projects, and talks.
Using Initial States to Identify Successful El Nino-Southern Oscillation Forecasts 1 Year in Advance. N. Ramesh, M. B. Freund, D. B. Irving, D. T. Squire, C. R> Tozer, D. P. Monselesan, T. Parker, A. Stellema, J. S. Risbey. Science Advances, 2026. https://doi.org/10.1126/sciadv.aeg8654
Quantifying the Uncertainty Associated with Extreme Weather Likelihood Estimates Derived from Large Model Ensembles. D. B. Irving, A. Stellema, D. P. Monselesan, T. Parker, N. Ramesh, C. R. Tozer and J. S. Risbey. Environmental Research Letters, 2026. https://doi.org/10.1088/1748-9326/ae860d
Extreme Monthly Rainfall Archetypes for Australia. J. S. Risbey, D. P. Monselesan, C. C. Chapman, C. Chung, A. Hannachi, D. B. Irving, T. Parker, M. J. Pook, N. Ramesh, A. Stellema, C. R. Tozer. Journal of Southern Hemisphere Earth System Science, 2025. https://doi.org/10.1071/ES25016
Precipitation Bursts in Northern Australia With and Without Preceding Heatwaves. S. Mohanty, N. Garg, N. Ramesh, M. Prakash. Weather and Climate Extremes, 2025. https://doi.org/10.1016/j.wace.2025.100845
A Soft Record Analysis of Extreme Heat across Australia. A. Stellema, D. B. Irving, J. S. Risbey, D. P. Monselesan, T. Parker, N. Ramesh C. R. Tozer. Meteorological Applications, 2025. https://doi.org/10.1002/met.70118
Observed Increase in Tropical Pacific Ocean Surface Cold-Warm Contrast is Well Outside Model-Simulated Range. I. Conde, J. Zika, R. M. Holmes, N. Ramesh. Geophysical Research Letters, 2025. https://doi.org/10.1029/2025GL116409
Impacts of the Large Seasonal Cycle of Upwelling Zone Sea Surface Temperatures on the Atmosphere. N. Ramesh, W. R. Boos. Journal of Climate, 2025. https://doi.org/10.1175/JCLI-D-24-0169.1
Climate Model Selection for the Climate Services for Agriculture's Application-Ready Data for Fiji. S. Mohanty, N. Ramesh, N. Garg, M. Prakash. CSIRO Technical Report, 2025. https://doi.org/10.25919/KQ8M-P116
Interannual ENSO Diversity, Transitions, and Projected Changes in Observations and Climate Models. M. B. Freund, J. R. Brown, A. G. Marshall, C. R. Tozer, B. J. Henley, J. S. Risbey, N. Ramesh, R. Lieber, S. Sharmila. Environmental Research Letters, 2024. https://doi.org/10.1088/1748-9326/ad78db
A Tale of Two Novembers: Confounding Influences on La Nina's Relationship with Rainfall in Australia. C. R. Tozer, J. S. Risbey, M. J. Pook, D. P. Monselesan, D. B. Irving, N. Ramesh, D. Richardson. Monthly Weather Review, 2024. https://doi.org/10.1175/MWR-D-23-0112.1
Geolocated Fish Spawning Habitats. K. L. Oremus, J. A. Rising, N. Ramesh, A. Ostroski. Nature Scientific Data, 2024. https://doi.org/10.1038/s41597-024-03348-3
A Multi-Model Likelihood Analysis of Unprecedented Extreme Rainfall Along the East Coast of Australia. D. B. Irving, J. S. Risbey, D. T. Squire, R. S. Matear, C. R. Tozer, D. P. Monselesan, N. Ramesh, J. P. Reddy, M. B. Freund. Meteorological Applications, 2024. https://doi.org/10.1002/met.2217
A Large-Ensemble Illustration of How Record-Shattering Heat Records Can Endure. J. S. Risbey, D. B. Irving, D. T. Squire, R. S. Matear, D. P. Monselesan, M. J. Pook, N. Ramesh, D. Richardson, C. R. Tozer. Environmental Research: Climate, 2023. https://doi.org/10.1088/2752-5295/acd714
Influence of monsoon low pressure systems on South Asian disasters and implications for disaster prediction. D. L. Suhas, N. Ramesh, R. M. Kripa, W. R. Boos. NPJ Climate and Atmospheric Science, 2023. https://doi.org/10.1038/s41612-023-00376-5
Impacts of ENSO on Australian rainfall: what not to expect. C. R. Tozer, J. S. Risbey, D. P. Monselesan, M. J. Pook, D. B. Irving, N. Ramesh, J. Reddy, D. T. Squire. Journal of Southern Hemisphere Earth System Science, 2023. https://doi.org/10.1071/ES22034
A large ensemble illustration of how record-shattering heat records can endure. J. S. Risbey, D. B. Irving, D. T. Squire, R. J. Matear, D. P. Monselesan, M. J. Pook, N. Ramesh, D. Richardson, C. R. Tozer. Environmental Research: Climate, 2023. https://doi.org/10.1088/2752-5295/acd714
The Unexpected Oceanic Peak in Energy Input to the Atmosphere and Its Consequences for Monsoon Rainfall. N. Ramesh, W. R. Boos. Geophysical Research Letters, 2022. https://doi.org/10.1029/2022GL099283
The Globally Coherent Pattern of Autumn Monsoon Precipitation. N. Ramesh, Q. Nicolas, W. R. Boos. Journal of Climate, 2021. https://doi.org/10.1175/JCLI-D-20-0740.1 [Selected as a Paper of Note by the Bulletin of the American Meteorological Society]
The Small World of Global Marine Fisheries: The Cross-Boundary Consequences of Larval Dispersal. N. Ramesh, J. A. Rising, K. L. Oremus. Science, 2019. https://doi.org/10.1126/science.aav3409
The Predictability of Tropical Pacific Decadal Variability: Insights from Attractor Reconstruction. N. Ramesh and Mark A. Cane. Journal of the Atmospheric Sciences, 2019. https://doi.org/10.1175/JAS-D-18-0114.1
Predictability and prediction of persistent cool states of the Tropical Pacific Ocean. N. Ramesh, M. A. Cane, R. Seager, D. E. Lee. Climate Dynamics, 2016. https://doi.org/10.1007/s00382-016-3446-3
All flavours of El Niño have similar early subsurface origins. N. Ramesh, R. Murtugudde. Nature Climate Change, 2013. https://doi.org/10.1038/nclimate1600
Meridional movement of wind anomalies during ENSO events and their role in event termination. S. McGregor, N. Ramesh, P. Spence, M. H. England, M. J. McPhaden, A. Santoso. Geophysical Research Letters, 2013. https://doi.org/10.1002/grl.50136
Agrifood Systems Climate Explorer (ASCE): a tool for enhancing food system resilience in Samoa, CSIRO Pacific Food Partnerships
My Climate View, CSIRO Climate Services for Agriculture
Resilient Infrastructure for Future Food Systems (RIFFS) in Melanesia
Autumn Monsoons: A Newly Discovered Climate Type. N. Ramesh, Q. Nicolas, and W. R. Boos. (Centre for Climate Research, Singapore, Jan 18, 2023)
Planning for Uncertainty: How Will Rainfall Change Under Climate Change? N. Ramesh (Roderick Distinguished Lecture, Council for Civil Engineering Sydney and University of Sydney, Oct 28, 2022)
Autumn Monsoons: A Newly Discovered Climate Type. N. Ramesh, Q. Nicolas, and W. R. Boos. (Ocean and Climate Physics Seminar, Lamont-Doherty Earth Observatory, Columbia University, Jun 17, 2022)
The Effects of Cloud Radiative Feedbacks Over the Ocean on Monsoon Energy Sources. N. Ramesh and W. R. Boos. (AGU Fall Meeting: Linking Clouds, Convection, and Circulation: Insights from Models, Theory, and Observations II. Dec 13, 2019)
Predictability and Prediction of Persistent Cool States of the Tropical Pacific Ocean. N. Ramesh, M. A. Cane, R. Seager, D. E. Lee (Invited talk, EGU General Assembly, 2019)
The Predictability of Tropical Pacific Decadal Variability: Insights from Attractor Reconstruction. N. Ramesh and M. A. Cane. (Presented at Stanford University AOCD Seminar; AMS Annual Meeting, 2018 (recorded); AGU Fall Meeting, 2017)
The Global Network of Marine Fisheries: the Socioeconomic Consequences of Larval Dispersal. N. Ramesh, J. A. Rising, K. L. Oremus, and D. S. Dookie. (Presented at NASA-GISS, 2017)
See also my Google Scholar.