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Enrico Scoccimarro, Silvio Gualdi, Gabriele Villarini, Gabriel A. Vecchi, Ming Zhao, Kevin Walsh, and Antonio Navarra

years. 2C2K: This experiment is made by combining the 2K and 2C perturbations. d. Methodology The amount of rainfall associated with a TC, both in models and observations, is computed by considering the daily precipitation in a 10° × 10° box around the center of the storm. According to previous studies (e.g., Lonfat et al. 2004 ; Larson et al. 2005 ; Kunkel et al. 2010 ), a 10° × 10° window (here defined as Box1100) is more than enough to include the majority of TC-related precipitation in most

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Gabriele Villarini, David A. Lavers, Enrico Scoccimarro, Ming Zhao, Michael F. Wehner, Gabriel A. Vecchi, Thomas R. Knutson, and Kevin A. Reed

.g., Mendelsohn et al. 2012 ; Peduzzi et al. 2012 ); this demographic change is acting in addition to the TC changes projected to occur as a result of climate change. Although heavy rainfall is a major hazard associated with TCs, few studies have examined the rainfall patterns associated with these storms. A recent analysis of observations found that over the period 1994–2008 TC-related heavy rainfall events in the United States occurred over twice as often as the long-term average ( Kunkel et al. 2010

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Suzana J. Camargo, Michael K. Tippett, Adam H. Sobel, Gabriel A. Vecchi, and Ming Zhao

Medium-Range Weather Forecasts (ECMWF) interim reanalysis (ERA-40) and National Centers for Environmental Protection (NCEP)–National Center for Atmospheric Research (NCAR) reanalysis, as well as retrievals of column water vapor from satellite passive microwave observations. The regression methodology is objective and provides a framework for the selection of the climate variables to be used in the index. This method led us to select four environmental variables for the index similar but not identical

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