Presentation PDF (2.7 MB)
The local frequency of hurricanes peaked near 6 storms/century between 2700 and 2400 years ago, and storm frequency was also elevated during the Medieval Climate Anomaly with 4-5 storms/century occurring between 1200 to 600 years ago. Hurricanes were less frequent with about 0-3 storms/century occurring between 1900 to 1600 years ago and during the Little Ice Age from 400 to 150 years ago. A marked decline in hurricane frequency, which began around 600 years ago, has persisted through present with below average storm frequency over the last 150 years when compared to the preceeding 4500 years. Given the stochastic nature of hurricane landfalls, however, any very recent trend in Atlantic-wide hurricane frequency would likely not yet be detectable in a single sedimentary record.
Comparisons of this paleohurricane reconstruction with other paleoclimate records indicate that hurricane frequency tended to increase with sea-surface temperature in the western Atlantic and with Loop Current penetration into the Gulf of Mexico. Increased incursions of the Loop Current's deep, warm waters into the Gulf may allow more hurricanes in the region to achieve their maximum, theoretical intensity by limiting the effects of storm-induced upwelling. In this way, low-frequency migrations of the Loop Current may have been partly responsible for previously postulated millennial-scale catastrophic hurricane phases in the Gulf. ENSO variability and changes in the position of the Atlantic ITCZ may also influence the favorability of the North Atlantic basin for hurricane formation and development on many timescales.
![](images/flag.png)
![](images/blue_ribbon.png)