Record of thousands of years: Mega-storm surge in Florida
- Date:
- September 23, 2014
- Source:
- American Geophysical Union
- Summary:
- The observational hurricane record for northwestern Florida is just 160 years long, yet hurricane activity is known to vary strongly over thousands of years. Digging back into the prehistorical hurricane record, a new analysis shows that scientists' reliance on such a narrow slice of observations has led them to sorely underestimate the frequency with which large hurricanes have slammed into Florida's Gulf Coast.
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The observational hurricane record for northwestern Florida is just 160 years long, yet hurricane activity is known to vary strongly over thousands of years. Digging back into the prehistorical hurricane record, Lin et al. find that scientists' reliance on such a narrow slice of observations has led them to sorely underestimate the frequency with which large hurricanes have slammed into Florida's Gulf Coast.
Based on historical records, northwestern Florida gets hit by a hurricane packing a five-meter (16-foot) storm surge every 400 years. Incorporating long-term paleohurricane records, the authors find that the frequency of such a storm is actually closer to every 40 years.
When strong storms batter the shore, waves can carry sediment far inland. Digging down into the sediment record, researchers can reproduce the occurrence of past storm surge. Using a hurricane model and storm surge sediment observations, the authors calculated the intensity and frequency of past hurricanes in Florida's Apalachee Bay. They find that while the frequency of hurricanes hitting the Gulf Coast has remained relatively the same over the past few thousand years, the storms' average intensities have been, at times, much higher than during the past 160 years.
Based on their paleohurricane storm surge observations, the authors suggest that, historically, northwestern Florida would see a storm surge of 6.3 meters (20.7 feet) every 100 years, 8.3 meters (27.2 feet) every 500 years, and 11.3 meters (37.1 feet) in a worst case scenario event. A storm surge of eight meters (26 feet), they say, would push tens of kilometers inland.
The authors suggest that assessments of hurricane risk in other coastal regions may also be biased by relatively short observational records, though the direction and magnitude of that bias is not obvious.
Story Source:
Materials provided by American Geophysical Union. Note: Content may be edited for style and length.
Journal Reference:
- Ning Lin, Philip Lane, Kerry A. Emanuel, Richard M. Sullivan, Jeffrey P. Donnelly. Heightened hurricane surge risk in northwest Florida revealed from climatological-hydrodynamic modeling and paleorecord reconstruction. Journal of Geophysical Research: Atmospheres, 2014; DOI: 10.1002/2014JD021584
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