Proxy records of paleohurricanes for the western and southern caribbean
This dissertation evaluates the hypothesis that hurricane activity levels in the North Atlantic during the late Holocene have been driven by latitudinal movements of the North Atlantic circulation system. Multi-millennial sedimentary proxy records, based on the occurrence of overwash clastic layers,...
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ftlouisianastuir:oai:repository.lsu.edu:gradschool_dissertations-1398 2024-09-15T18:21:36+00:00 Proxy records of paleohurricanes for the western and southern caribbean McCloskey, Terrence Allen 2009-01-01T08:00:00Z application/pdf https://repository.lsu.edu/gradschool_dissertations/399 https://doi.org/10.31390/gradschool_dissertations.399 https://repository.lsu.edu/context/gradschool_dissertations/article/1398/viewcontent/McCloskey_diss.pdf unknown LSU Scholarly Repository https://repository.lsu.edu/gradschool_dissertations/399 doi:10.31390/gradschool_dissertations.399 https://repository.lsu.edu/context/gradschool_dissertations/article/1398/viewcontent/McCloskey_diss.pdf LSU Doctoral Dissertations Paleotempestology Belize Nicaragua Barbados paleoenvironment hurricane activity regimes Oceanography and Atmospheric Sciences and Meteorology text 2009 ftlouisianastuir https://doi.org/10.31390/gradschool_dissertations.399 2024-08-08T04:27:17Z This dissertation evaluates the hypothesis that hurricane activity levels in the North Atlantic during the late Holocene have been driven by latitudinal movements of the North Atlantic circulation system. Multi-millennial sedimentary proxy records, based on the occurrence of overwash clastic layers, provide clear evidence of abruptly alternating periods of hurricane landfall frequency for Nicaragua and Belize. Three Belizean transects exhibit an Active period (hyperactivity) occurring from ~2000-6000 cal yr BP, although dating is inconsistent across the transects. An Active period covering the last 500 years is found at one location. The Nicaraguan record, derived from three transects covering >90 km of coastline, consistently displays an Active period covering the last 800 years, preceded by a Quiet period that lasts until at least ~2800 years BP, before which time environmental factors render the sites insensitive. For both coastlines the calculated strike frequency increased by a factor of 3-12 during Active periods. The Barbados depositional record is characterized by sudden shifts from organic to clay, attributed to increased aridity, with the arid periods being roughly contemporaneous with the Active periods occurring in Belize and Nicaragua, as well as periods of southern residency of the Intertropical Convergence Zone. Latitudinal movements of a unified North Atlantic circulation system were probably the driver of these changes, with southern migration increasing both landfall frequency and aridity regionally. When correlated with published records, the timing of activity regime changes identified from our sites indicates that periods of increased hurricane activity proceed across the North Atlantic in a time-transgressive manner, with the Caribbean hyperactive period preceding that of the Gulf of Mexico. The Active period for Nicaragua beginning ~850 years BP is anti-phase with a recently published model, predicated upon basin-wide synchroneity in activity patterns. This discrepancy possibly results ... Text North Atlantic LSU Digital Commons (Louisiana State University) |
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LSU Digital Commons (Louisiana State University) |
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ftlouisianastuir |
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topic |
Paleotempestology Belize Nicaragua Barbados paleoenvironment hurricane activity regimes Oceanography and Atmospheric Sciences and Meteorology |
spellingShingle |
Paleotempestology Belize Nicaragua Barbados paleoenvironment hurricane activity regimes Oceanography and Atmospheric Sciences and Meteorology McCloskey, Terrence Allen Proxy records of paleohurricanes for the western and southern caribbean |
topic_facet |
Paleotempestology Belize Nicaragua Barbados paleoenvironment hurricane activity regimes Oceanography and Atmospheric Sciences and Meteorology |
description |
This dissertation evaluates the hypothesis that hurricane activity levels in the North Atlantic during the late Holocene have been driven by latitudinal movements of the North Atlantic circulation system. Multi-millennial sedimentary proxy records, based on the occurrence of overwash clastic layers, provide clear evidence of abruptly alternating periods of hurricane landfall frequency for Nicaragua and Belize. Three Belizean transects exhibit an Active period (hyperactivity) occurring from ~2000-6000 cal yr BP, although dating is inconsistent across the transects. An Active period covering the last 500 years is found at one location. The Nicaraguan record, derived from three transects covering >90 km of coastline, consistently displays an Active period covering the last 800 years, preceded by a Quiet period that lasts until at least ~2800 years BP, before which time environmental factors render the sites insensitive. For both coastlines the calculated strike frequency increased by a factor of 3-12 during Active periods. The Barbados depositional record is characterized by sudden shifts from organic to clay, attributed to increased aridity, with the arid periods being roughly contemporaneous with the Active periods occurring in Belize and Nicaragua, as well as periods of southern residency of the Intertropical Convergence Zone. Latitudinal movements of a unified North Atlantic circulation system were probably the driver of these changes, with southern migration increasing both landfall frequency and aridity regionally. When correlated with published records, the timing of activity regime changes identified from our sites indicates that periods of increased hurricane activity proceed across the North Atlantic in a time-transgressive manner, with the Caribbean hyperactive period preceding that of the Gulf of Mexico. The Active period for Nicaragua beginning ~850 years BP is anti-phase with a recently published model, predicated upon basin-wide synchroneity in activity patterns. This discrepancy possibly results ... |
format |
Text |
author |
McCloskey, Terrence Allen |
author_facet |
McCloskey, Terrence Allen |
author_sort |
McCloskey, Terrence Allen |
title |
Proxy records of paleohurricanes for the western and southern caribbean |
title_short |
Proxy records of paleohurricanes for the western and southern caribbean |
title_full |
Proxy records of paleohurricanes for the western and southern caribbean |
title_fullStr |
Proxy records of paleohurricanes for the western and southern caribbean |
title_full_unstemmed |
Proxy records of paleohurricanes for the western and southern caribbean |
title_sort |
proxy records of paleohurricanes for the western and southern caribbean |
publisher |
LSU Scholarly Repository |
publishDate |
2009 |
url |
https://repository.lsu.edu/gradschool_dissertations/399 https://doi.org/10.31390/gradschool_dissertations.399 https://repository.lsu.edu/context/gradschool_dissertations/article/1398/viewcontent/McCloskey_diss.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
LSU Doctoral Dissertations |
op_relation |
https://repository.lsu.edu/gradschool_dissertations/399 doi:10.31390/gradschool_dissertations.399 https://repository.lsu.edu/context/gradschool_dissertations/article/1398/viewcontent/McCloskey_diss.pdf |
op_doi |
https://doi.org/10.31390/gradschool_dissertations.399 |
_version_ |
1810460254438162432 |