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Tropical cyclones and climate change

Abstract

Whether the characteristics of tropical cyclones have changed or will change in a warming climate — and if so, how — has been the subject of considerable investigation, often with conflicting results. Large amplitude fluctuations in the frequency and intensity of tropical cyclones greatly complicate both the detection of long-term trends and their attribution to rising levels of atmospheric greenhouse gases. Trend detection is further impeded by substantial limitations in the availability and quality of global historical records of tropical cyclones. Therefore, it remains uncertain whether past changes in tropical cyclone activity have exceeded the variability expected from natural causes. However, future projections based on theory and high-resolution dynamical models consistently indicate that greenhouse warming will cause the globally averaged intensity of tropical cyclones to shift towards stronger storms, with intensity increases of 2–11% by 2100. Existing modelling studies also consistently project decreases in the globally averaged frequency of tropical cyclones, by 6–34%. Balanced against this, higher resolution modelling studies typically project substantial increases in the frequency of the most intense cyclones, and increases of the order of 20% in the precipitation rate within 100 km of the storm centre. For all cyclone parameters, projected changes for individual basins show large variations between different modelling studies.

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Figure 1: Past and extrapolated changes in Atlantic hurricane power dissipation index (PDI).
Figure 2: Tropical Atlantic indices.
Figure 3: Simulated versus observed Atlantic tropical cyclone interannual variability (approximately 1980–2006) using several methods.
Figure 4: Sensitivity of projected tropical cyclone activity to different climate models providing downscaling conditions.

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Acknowledgements

The authors constitute an expert team established by the World Meteorological Organization to provide advice to national meteorological and hydrological services on tropical cyclones and climate change. T.K. and J.L.M. are co-chairs of this team. J.L.M was supported by the West Australian Government Indian Ocean Climate Initiative. The team wishes to thank the Sultanate of Oman and Sultan Qaboos University for kindly sponsoring the initial discussion meeting for this report (March 2009 in Muscat, Oman). We also thank our colleagues for several helpful reviews, discussions and figure contributions.

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All authors contributed equally to the assessments described in this report, and all contributed to the writing, with T.K. being the lead author.

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Correspondence to Thomas R. Knutson.

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Knutson, T., McBride, J., Chan, J. et al. Tropical cyclones and climate change. Nature Geosci 3, 157–163 (2010). https://doi.org/10.1038/ngeo779

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