Research

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.

Publications

• 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

In Review:

• GO-FISH: Geolocated Ocean-Fishery Identified Spawning Habitats. K. L. Oremus, J. A. Rising, N. Ramesh, A. J. Ostroski. Scientific Data.

• Wrangler for the Emergency Events Database: A Tool for Geocoding and Analysis of a Global Disaster Dataset. R. M. Kripa, N. Ramesh, W. R. Boos. (arXiv:2208.12634) Journal of Open Research Software.

In Preparation:

• Impacts of the Seasonal Cycle of Oceanic Eastern Boundary Upwelling on the Atmosphere. N. Ramesh, W. R. Boos.

• Using Moist Energy Fluxes to Attribute Climate Model Precipitation Bias to Ocean Evaporation. W. R. Boos, N. Ramesh, R. J. Bombardi.

Ongoing Projects

• The influence of eastern boundary upwelling zones on atmospheric circulation 

• Extracting Multiyear Climate Information for Drought Resilience (Project Lead), CSIRO Drought Resilience Mission 

• Agrifood Systems Climate Explorer (ASCE): a tool for enhancing food system resilience in Samoa, CSIRO Pacific Food Partnerships

• Spatiotemporal statistical learning techniques for characterizing ENSO diversity

Selected Talks

• 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.