TROPICAL CYCLONES IN A WARMER WORLD
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1 TROPICAL CYCLONES IN A WARMER WORLD Dr Mark Saunders Benfield Hazard Research Centre Department of Space and Climate Physics University College London Workshop for Under 35s Reinsurance Group 14th October 2004 Regional Occurrence NATURAL HAZARDS IN A WARMER WORLD Slide 2 Workshop for Under 35s Reinsurance Group 1
2 Tropical Cyclones in a Warmer World 14th October, 2004 Relevance for (Re)Insurers l U.S. and Caribbean. Caribbean. Rank as the region region s costliest natural disaster. disaster. l Asia. Asia. Rank as the most costly and deadly natural disaster affecting much of Japan, South Korea, Taiwan, the Philippines, and coastal areas in other SE Asian countries. l Australia and SW Pacific. Pacific. Rank as a significant cause of natural disaster loss. NATURAL HAZARDS IN A WARMER WORLD Slide 3 Losses Isabel l l U.S. Hurricane annual damage bill is estimated as US $ 5.1 bn (economic), US $ 2.6 (insured) at 2004 $. US East Coast Asia. Typhoon annual damage bill ( ) is US $3.5 bn (economic) at 2004 $. Taiwan NATURAL HAZARDS IN A WARMER WORLD Workshop for Under 35s Reinsurance Group Slide 4 2
3 U.S. Damaging Storms 2004 Courtesy of NOAA and UW-CIMSS NATURAL HAZARDS IN A WARMER WORLD Slide 5 Where Does 2004 Rank? North Atlantic ACE (Accumulated Cyclone Energy) index: 3rd highest (after 1950 and 1995) since U.S. ACE index: 2nd highest (after 1964) since U.S. hurricane total insured loss: 2nd highest (after 1992) since Tropical storm strikes on Japan: Equal 1st for most (records since 1970). NATURAL HAZARDS IN A WARMER WORLD Slide 6 Workshop for Under 35s Reinsurance Group 3
4 Return Periods U.S. hurricane strikes (4 or more): 17 years. U.S. ACE index (7.5 x 10 4 kts 2 ): 40 years. U.S. hurricane total insured loss (US $ 22bn): 37 years (see opposite). Hilti,, Saunders and Lloyd-Hughes (2004) NATURAL HAZARDS IN A WARMER WORLD Slide 7 How has Tropical Cyclone Activity Varied in the Past? NATURAL HAZARDS IN A WARMER WORLD Slide 8 Workshop for Under 35s Reinsurance Group 4
5 250 North Atlantic ACE index NATURAL HAZARDS IN A WARMER WORLD Slide 9 NE Pacific ACE index NE Pacific ACE Index NATURAL HAZARDS IN A WARMER WORLD Slide 10 Workshop for Under 35s Reinsurance Group 5
6 600 NW Pacific ACE index NATURAL HAZARDS IN A WARMER WORLD Slide U.S. ACE index US ACE Index NATURAL HAZARDS IN A WARMER WORLD Slide 12 Workshop for Under 35s Reinsurance Group 6
7 Florida ACE index NATURAL HAZARDS IN A WARMER WORLD Slide 13 Japan ACE index Japan ACE Index NATURAL HAZARDS IN A WARMER WORLD Slide 14 Workshop for Under 35s Reinsurance Group 7
8 12 Australian ACE index 1970/1-2003/ NATURAL HAZARDS IN A WARMER WORLD Slide 15 Significant Trend or Change in Variance? l No significant change in ACE index or ACE index variance is observed anywhere,, either over the full period or, for the U.S., using the recent period compared to prior 26-year periods. l The change in ACE index due to natural climate variability is everywhere an order of magnitude greater than that which may be attributable to trend in the historical record. NATURAL HAZARDS IN A WARMER WORLD Slide 16 Workshop for Under 35s Reinsurance Group 8
9 Conclusions 1. Global warming has, at present, had little or no increasing impact on northern hemisphere tropical cyclone activity. 2. Observed changes in activity are due predominantly to natural climate variability. NATURAL HAZARDS IN A WARMER WORLD Slide 17 Multi-Decadal Variability (Goldenberg et al., Science, 2001) Leading mode of Atlantic non-enso SST variability Temporal reconstruction of SST mode-related variability for hurricane main development region. NATURAL HAZARDS IN A WARMER WORLD Slide 18 Workshop for Under 35s Reinsurance Group 9
10 What is our Current Understanding of How Tropical Cyclone Activity Will Vary in the Future? NATURAL HAZARDS IN A WARMER WORLD Slide 19 Atlantic Hurricane Predictors Trade Wind Predictor SST Predictor NATURAL HAZARDS IN A WARMER WORLD Slide 20 Workshop for Under 35s Reinsurance Group 10
11 Hurricane Numbers Tropical Atlantic, Caribbean Sea and Gulf Perfect Predictors R 2 = 0.67 NATURAL HAZARDS IN A WARMER WORLD Slide 21 Future Projections for Tropical Atlantic, Caribbean and Gulf Hurricane Numbers NATURAL HAZARDS IN A WARMER WORLD Slide 22 Workshop for Under 35s Reinsurance Group 11
12 Future Projections for Tropical Atlantic, Caribbean and Gulf Intense Hurricane Nos NATURAL HAZARDS IN A WARMER WORLD Slide 23 Future Projections for Tropical Atlantic SST NATURAL HAZARDS IN A WARMER WORLD Slide 24 Workshop for Under 35s Reinsurance Group 12
13 Hurricane Intensity Knutson and Tuleya (2004) in a detailed GCM modeling study predict: 1. 6% increase in hurricane maximum intensity with an 80% increase in CO 2. This is line with theoretical estimates by Emanuel % increase in mean precipitation rate within 100km of the storm centre. These changes may not be detectable for a few decades. NATURAL HAZARDS IN A WARMER WORLD Slide 25 Conclusions 1. The number of North Atlantic, U.S. and Caribbean hurricanes may rise slowly due to global warming. 2. However, the increase in the number of hurricanes and in hurricane maximum intensity over the next 100 years is thought to be about 10% and thus is small compared to the range of natural year-to-year variability. NATURAL HAZARDS IN A WARMER WORLD Slide 26 Workshop for Under 35s Reinsurance Group 13
14 The historical record shows repeated quiet and active periods for U.S. hurricanes. Since 1999, U.S. hurricane strikes have been running 50% below average and U.S. hurricane insured losses 80% below norm In Context 2004 has seen the recent hurricane dry spell corrected. NATURAL HAZARDS IN A WARMER WORLD Slide 27 Future Risk to (Re)Insurers? Although uncertainties remain, the vast majority of future hurricane losses in the U.S. and Caribbean are thought to continue to result from natural interannual and decadal climate variability and not from global warming. Since traditional insurance policies are set for the year ahead (or at most out to five years) the impact of global warming on risk over this timescale will be small or negligible. NATURAL HAZARDS IN A WARMER WORLD Slide 28 Workshop for Under 35s Reinsurance Group 14
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