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Projected future changes in tropical cyclone-related wave climate in the North Atlantic

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Abstract

Tropical cyclones are a major hazard for numerous countries surrounding the tropical-to-subtropical North Atlantic sub-basin including the Caribbean Sea and Gulf of Mexico. Their intense winds, which can exceed 300 km h−1, can cause serious damage, particularly along coastlines where the combined action of waves, currents and low atmospheric pressure leads to storm surge and coastal flooding. This work presents future projections of North Atlantic tropical cyclone-related wave climate. A new configuration of the ARPEGE-Climat global atmospheric model on a stretched grid reaching ~ 14 km resolution to the north-east of the eastern Caribbean is able to reproduce the distribution of tropical cyclone winds, including Category 5 hurricanes. Historical (1984–2013, 5 members) and future (2051–2080, 5 members) simulations with the IPCC RCP8.5 scenario are used to drive the MFWAM (Météo-France Wave Action Model) spectral wave model over the Atlantic basin during the hurricane season. An intermediate 50-km resolution grid is used to propagate mid-latitude swells into a higher 10-km resolution grid over the tropical cyclone main development region. Wave model performance is evaluated over the historical period with the ERA5 reanalysis and satellite altimetry data. Future projections exhibit a modest but widespread reduction in seasonal mean wave heights in response to weakening subtropical anticyclone, yet marked increases in tropical cyclone-related wind sea and extreme wave heights within a large region extending from the African coasts to the North American continent.

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Acknowledgements

We are grateful to two anonymous reviewers whose detailed and constructive comments greatly helped improve the quality of the original manuscript. We acknowledge L. Aouf for advice with MFWAM calibration/validation, D. Paradis, P. Cantet and R. Osinski for fruitful discussions, and P.-C. Dutrieux for help with post-processing algorithms. The altimeter wave data were obtained from the ESA CCI Sea State project. This effort is sponsored by the European Regional Development Fund, Guadeloupe region, grant CR/16-115 C3AF (Changement Climatique et Conséquences sur les Antilles Françaises).

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Correspondence to Ali Belmadani.

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Supplementary Information

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382_2021_5664_MOESM1_ESM.pdf

Supplementary file 1 Fig. S1. Projected changes in decorrelation time scales (days) for hurricane-season a) surface wind speed U10 fromARPEGE-Climat, b) significant wave height Hs and c) mean wave period Tm from MFWAM05 between W-RCP8.5(2051-2080) and W-Hist-Model (1984-2013). W-Hist-Model values are overlaid as black contours. ARPEGE-Climat data are masked over land (PDF 435 KB)

382_2021_5664_MOESM2_ESM.png

Supplementary file 2 Fig. S2. Differences in the mean present-climate (1984-2013) hurricane-season surface winds (arrows) and wind speed U10 (shading) between Hist-Obs and ERA5. ERA5 values for U10 are overlaid as black contours. The data have been interpolated onto a 0.5° grid, and are masked over land. The arrows are for the difference in wind vectors. Units are m.s-1 (PNG 250 KB)

382_2021_5664_MOESM3_ESM.pdf

Supplementary file 3 Fig. S3. Differences in the a) mean and b) standard deviation of 1991-2013 ASO significant wave height Hs (m)between MFWAM05 W-Hist-Obs and ESA Sea State CCI (shading), with ESA Sea State CCI values overlaid as blackcontours. The MFWAM05 data have been interpolated onto a 1° grid. Differences exceeding +/-0.6 m are masked inwhite (PDF 377 KB)

382_2021_5664_MOESM4_ESM.pdf

Supplementary file 4 Fig. S4. Same as Fig. 9ac, except for (a,c) significant height of primary swell Hs1 (m) and (b,d) mean wave period Tm(s) (PDF 362 KB)

382_2021_5664_MOESM5_ESM.pdf

Supplementary file 5 Fig. S5. Same as Fig. 10ab, except for significant height of (a,b) primary swell Hs1 and (c,d) wind waves Hs0 (m). (PDF 500 KB)

Supplementary file 6 Fig. S6. (a,b) same as Fig. 11cd and (c,d) same as Fig. 11ef, except fromMFWAM01 (PDF 168 KB)

Supplementary file 7 Fig. S7. Same as Fig. 5, except averaged over ASO (PDF 649 KB)

Supplementary file 8 Fig. S8. (a), (b), (c) same as Fig. 10a, S5a, S5c, respectively, except over ASO (PDF 392 KB)

Supplementary file 9 (DOCX 11 KB)

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Belmadani, A., Dalphinet, A., Chauvin, F. et al. Projected future changes in tropical cyclone-related wave climate in the North Atlantic. Clim Dyn 56, 3687–3708 (2021). https://doi.org/10.1007/s00382-021-05664-5

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  • DOI: https://doi.org/10.1007/s00382-021-05664-5

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