NHESS Natural Hazards and Earth System Sciences NHESS Nat. Hazards Earth Syst. Sci. 1684-9981 Copernicus Publications Göttingen, Germany 10.5194/nhess-9-1749-2009 Quantifying changes of wind speed distributions in the historical record of Atlantic tropical cyclones Chen K. 1 McAneney J. 1 Cheung K. 2 Risk Frontiers – Natural Hazards Research Centre, Macquarie University, NSW 2109, Australia Department of Environment & Geography, Macquarie University, NSW 2109, Australia 30 10 2009 9 5 1749 1757 Copyright: © 2009 K. Chen et al. 2009 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://nhess.copernicus.org/articles/9/1749/2009/nhess-9-1749-2009.html The full text article is available as a PDF file from https://nhess.copernicus.org/articles/9/1749/2009/nhess-9-1749-2009.pdf

Here we re-examine the official Atlantic basin tropical cyclone (hurricane) database HURDAT (1851–2008) and quantify differences between wind speed distributions in the early historical (1851–1943) record and more recent observations. Analyses were performed at three different geographical levels: for all six-hourly track segments of all Atlantic basin events, all segments of all events that crossed the US mainland, and US landfalling segments alone. At all three geographical levels of study, distributions of windspeeds over the last two, four and six decades display negligible dispersion or systematic change over time. On the other hand and relative to wind speed frequencies for subsequent years, the 1851–1943 record has a marked and statistically significant over-representation of wind speeds largely corresponding to Saffir-Simpson Categories 1 and 2 and under-representation of Categories 4 and 5 events; importantly, no single Category 5 event is recorded prior to 1924. The stability of the distribution of windspeeds at landfall over the last six decades, the dataset in which we can have most confidence, suggests that the differences in the earlier record are most likely explained by well-known measurement and observational deficiencies. Moreover by disaggregating the Power Dissipation Index (PDI), we demonstrate that the upward trend in Atlantic basin PDI since 1970s does not imply stronger and longer duration Category 5 windspeeds despite a warming climate. These results have implications for hurricane catastrophe loss modeling for the insurance industry and long-term trend analyses of the historical wind speed record, especially those related to the attribution of the role of Global Climate Change.

 References Blake, E. S., Rappaport, E. N., and Landsea, C. W.: The Deadliest, Costliest, And Most Intense United States Tropical Cyclones From 1851 To 2006 (And Other Frequently Requested Hurricane Facts), NOAA Technical Memorandum NWS TPC-5, National Hurricane Center, Miami, Florida, 2007. Chang, E. K. M. and Guo, Y.: Is the number of North Atlantic tropical cyclones significantly underestimated prior to the availability of satellite observations?, Geophys. Res. Lett., 34, L14801, https://doi.org/10.1029/2007GL030169, 2007. Chenoweth, M. and Divine, D.: A document-based 318-year record of tropical cyclones in the Lesser Antilles, 1690–2007, Geochem. Geophy. Geosy., 9, Q08013, https://doi.org/10.1029/2008GC002066, 2008. Crompton, R. P. and McAneney, K. J.: Normalised Australian insured losses from meteorological hazards: 1967–2006, Environ. Sci. Policy, 11, 371–378, 2008. Emanuel, K., Sundararajan, R., and Williams, J.: Hurricanes and global warming: Results from downscaling IPCC AR4 simulations, B. Am. Meteorol. Soc., 89, 347–367, 2008. Emanuel, K.: Environmental factors affecting tropical cyclone power dissipation, J. Climate, 20, 5497–5509, 2007. Emanuel, K.: Increasing destructiveness of tropical cyclones over the past 30 years, Nature, 436, 686–688, 2005. Goldenberg, S. B., Landsea, C. W., Mestas-Nunez, A. M., and Gray, W. M.: The recent increase in Atlantic hurricane activity: Causes and implications, Science, 293, 474–479, 2001. Grossi, P. and Kunreuther, H. (Eds.): Catastrophe Modeling: A New Approach to Managing Risk, Springer, New York, 2005. Holland, G. J. and Webster, P. J.: Heightened tropical cyclone activity in the North Atlantic: natural variability or climate trend?, Philos. T. R. Soc A, 365(1860), 2695–2716, https://doi.org/10.1098/rsta.2007.2083, 2007. Hoyos, C. D., Agudelo, P. A., Webster, P. J., and Curry, J. A.: De-convolution of the factors contributing to the increase in global hurricane intensity, Science, 312, 94–97, 2006. Iman, R. L., Johnson, M. E., and Watson Jr., C. C.: Uncertainty analysis for computer model projections of hurricane losses, Risk Anal., 25, 1299–1312, 2005. Jagger, T. H. and Elsner, J. B.: Climatology models for extreme hurricane winds near the United States, J. Climate, 19, 3220–3236, 2006. Jarvinen, B. R., Neumann, C. J., and Davis, M. A. S.: A Tropical Cyclone Data Tape For the North Atlantic Basin, 1886–1983: Contents, Limitations, and Uses, NOAA Technical Memorandum NWS NHC-22, National Hurricane Center, Miami, Florida, 1984. Knutson, T. R., Sirutis, J .J., Garner, S. T., Vecchi, G. A., and Held, I. M.: Simulated reduction of Atlantic hurricane frequency under twenty-first-century warming conditions, Nature Geosci., 1, 359–364, https://doi.org/10.1038/ngeo202, 2008. Kossin, J. P., Knapp, K. R., Vimont, D. J., Murnane, R. J., and Harper, B. A.: A globally consistent reanalysis of hurricane variability and trends, Geophys. Res. Lett., 34, L04815, https://doi.org/10.1029/2006GL028836, 2007. Landsea, C. W.: Counting Atlantic tropical cyclones back to 1900, Eos, 88, 197–202, 2007. Landsea, C. W., Anderson, C. A., Charles, N., Clark, G., Dunion, J., Fernandez-Partagas, J., Hungerford, P., Neumann, C., and Zimmer, M.: The Atlantic hurricane database re-analysis project: Documentation for 1851–1910 alterations and additions to the HURDAT database, in: Hurricanes and Typhoons: Past, Present and Future, edited by: Murnane, R. J. and Liu, K. B., Columbia Univ. Press, New York, 177–221, 2004. Landsea, C. W., Glenn, D. A., Bredemeyer, W., Chenoweth, M., Ellis, R., Gamache, J., Hufstetler, L., Mock, C., Perez, R., Prieto, R., Sanchez-Sesma, J., Thomas, D., and Woolcock, L.: A reanalysis of the 1911-20 Atlantic hurricane database, J. Climate, 21, 2138–2168, 2008. Landsea, C. W.: Hurricanes and global warming, Nature, 438, E11–13, 2005. Landsea, C. W., Harper, B. A., Hoarau, K., and Knaff, J. A.: Can we detect trends in extreme tropical cyclones?, Science, 313, 452–454, 2006. Landsea, C. W., Vecchi, G. A., Bengtsson, L., and Knutson, T. R.: Impact of duration thresholds on Atlantic tropical cyclone counts, J. Climate, https://doi.org/10.1175/2009JCLI3034.1, in press, 2009. Liu, K. B.: Uncovering prehistoric hurricane activity, Am. Sci., 95, 126–133, 2007. Lonfat, M., Boissonnade, A., and Muir-Wood, R.: Atlantic basin, U.S. and Caribbean land-fall activity rates over the 2006–2010 period: an insurance industry perspective, Tellus A, 59, 499–510, 2007. Mann, M. and Emanuel, K.: Atlantic hurricane trends linked to climate change, Eos, 87, 233–241, 2006. Nyberg, J, Malmgren, B. A., Winter, A., Jury, M. R., Kilbourne, K. H., and Quinn, T. M.: Low Atlantic hurricane activity in the 1970s and 1980s compared to the past 270 years, Nature, 447, 698–702, 2007. Pielke Jr., R. A., Gratz, J., Landsea, C. W., Collins, D., Saunders, M. A., and Musulin, R.: Normalized hurricane damage in the United States: 1900–2005, Natural Hazards Review, 9, 29–42, 2008. Pielke Jr., R. A.: Are there trends in hurricane destruction?, Nature, 438, E11, 2005. Pielke Jr., R. and Landsea C.: Normalised hurricane damages in the United States, Weather Forecast., 13, 621–631, 1998. Pielke Jr., R., Landsea, C., Mayfield, M., Laver, J., and Pasch, R.: Hurricanes and global warming, B. Am. Meteorol. Soc., 87, 1571–1575, 2005. Pielke Jr., R., Landsea, C., Musulin, R., and Downton, M.: Evaluation of catastrophe models using a normalized historical record: Why it is needed and how to do it, J. Risk Insur., 18, 177–194, 1999. Saunders, M. A. and Lea, A. S.: Large contribution of sea surface warming to recent increase in Atlantic hurricane activity, Nature, 451, 557–560, 2008. Solow, A. and Beet, A. R.: On the incompleteness of the historical record of North Atlantic tropical cyclones, Geophys. Res. Lett., 35, L11803, https://doi.org/10.1029/2008GL033546, 2008. Swiss Re: Sigma 2/2009, available at: http://www.swissre.com/sigma, 2009. Trenberth, K. E. and Shea, D. J.: Atlantic hurricanes and natural variability in 2005, Geophys. Res. Lett., 33, L12704, https://doi.org/10.1029/2006GL026894, 2006. Vecchi, G. A. and Knutson, T. R.: On estimates of historical North Atlantic tropical cyclone activity, J. Climate, 21, 3580–3600, 2008. Velden, C., Harper, B., Wells, F., Beven II, J. L., Zehr, R., Olander, T., Mayfield, M., Guard, C., Lander, M., Edson, R., Avila, L., Burton, A., Turk, M., Kikuchi, A., Christian, A., Caroff, P., and McCrone, P.: The Dvorak tropical cyclone intensity estimation technique: A satellite-based method that has endured for over 30 years, B. Am. Meteorol. Soc., 87, 1195–1210, 2006. Watson Jr., C. C. and Johnson, M. E.: Hurricane loss estimation models: opportunities for improving the state of the art, B. Am. Meteorol. Soc., 85, 1713–1726, 2004. Webster, P. J., Holland, G. J., Curry, J. A., and Chang, H.-R.: Changes in tropical cyclone number, duration, and intensity in a warming environment, Science, 309, 1844–1846, 2005.