Tropical cyclones within the sedimentary record : analyzing overwash deposition from event to millennial timescales
Woodruff, Jonathan D.
MetadataShow full item record
LocationVieques, Puerto Rico
Tropical cyclone activity over the last 5000 years is investigated using overwash sediments from coastal lagoons on the islands of Vieques, Puerto Rico and Koshikijima, Japan. A simple sediment transport model can reproduce the landward fining deposits observed at Vieques, and reveals that although the record exhibits centennial-tomillennial changes in hurricane overwash frequency, the magnitude of these flooding events has remained relatively constant. Stochastic simulations of hurricane overwash show that breaks in activity at Vieques are extremely long and unlikely to occur under the current hurricane climatology and the present barrier morphology. Periods of less frequent hurricane deposition at Vieques are contemporaneous with intervals of increased El Niño occurrences and reduced precipitation in West Africa, suggesting a dominant influence by these two climatic phenomena. Hiatuses in overwash activity between 3600- to-2500 and 1000-500 years ago are longer than what is generated by overwash simulations under a constant El Niño-like state, indicating that mechanisms in addition to variability in the El Niño/Southern Oscillation are required to completely produce the overwash variability at Vieques. Periods of low overwash activity at Vieques are concurrent with increased overwash activity at Kamikoshiki and may indicate a correspondence between tropical cyclone activity in the western Northern Atlantic and the western North Pacific.
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2009.
Showing items related by title, author, creator and subject.
Tropical cyclone wind speed constraints from resultant storm surge deposition : a 2500 year reconstruction of hurricane activity from St. Marks, FL Brandon, Christine M.; Woodruff, Jonathan D.; Lane, D. Philip; Donnelly, Jeffrey P. (John Wiley & Sons, 2013-08-22)Recent work suggests that the patterns of intense (≥category 3 on the Saffir-Simpson scale) hurricane strikes over the last few millennia might differ from that of overall hurricane activity during this period. Prior studies ...
Fries, Jerry Stephen (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-02)Predictions of deposition rate are integral to the transport of many constituents including contaminants, organic matter, and larvae. Review of the literature demonstrates a general appreciation for the potential control ...
Identification of chemoautotrophic microorganisms from a diffuse flow hydrothermal vent at EPR 9° North using 13C DNA Stable Isotope Probing and Catalyzed Activated Reporter Deposition-Fluorescence in situ Hybridization Richberg, Kevin P. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-09)At deep‐sea hydrothermal vents chemolithoautotrophic microbes mediate the transfer of geothermal chemical energy to higher trophic levels. To better understand these underlying processes and the organisms catalyzing them, ...