Intense Hurricane Activity Over the Past 1500 Years at South Andros Island, The Bahamas
Intense Hurricane Activity Over the Past 1500 Years at South Andros Island, The Bahamas
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DOI：
10.1029/2019pa003665
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发表时间：
2019-11
影响因子：
3.5
通讯作者：
E. Wallace;J. Donnelly;P. J. Hengstum;C. Wiman;R. Sullivan;T. S. Winkler;N. D’Entremont;M. Toomey;N. Albury
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文献类型：
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作者：
E. Wallace;J. Donnelly;P. J. Hengstum;C. Wiman;R. Sullivan;T. S. Winkler;N. D’Entremont;M. Toomey;N. Albury
飓风在沿海地区造成大量生命和资源损失。不幸的是，历史飓风记录太短且不完整，无法在数十年和更长的时间尺度上捕捉飓风-气候相互作用。在加勒比海蓝洞中保存的由飓风引起的粗颗粒沉积物可以提供数千年前飓风活动的记录。在这里，我们提出了一个高分辨率的记录，强烈的飓风事件在过去的1500年从一个蓝洞南安德罗斯岛上的大巴哈马银行。这一记录得到了附近两个蓝洞收集的岩芯的较短重建的证实。该记录包含粗粒事件沉积物，可归因于已知的历史飓风袭击，其年龄不确定。在过去的1500年里，南安德罗斯有四个飓风活跃期的证据。在过去的163年里，这些活跃的间隔都没有出现。我们认为，热带辐合带的位置调制飓风活动的基础上与Cariaco盆地钛浓度的相关性。世纪早期，南安德罗斯岛的火山活动出现了一个异常的间隙，这与火山活动增加的时期相对应。从南安德罗斯岛重建的飓风活动模式与墨西哥湾东北部的飓风活动模式非常匹配，但与新英格兰的记录相反。我们建议，无论是当地环境条件的变化（例如，当墨西哥湾和加勒比海东南部不那么活跃时，北大西洋西部的活动增加可能是由于风暴路径向东北方向移动。
Hurricanes cause substantial loss of life and resources in coastal areas. Unfortunately, historical hurricane records are too short and incomplete to capture hurricane‐climate interactions on multi‐decadal and longer timescales. Coarse‐grained, hurricane‐induced deposits preserved in blue holes in the Caribbean can provide records of past hurricane activity extending back thousands of years. Here we present a high resolution record of intense hurricane events over the past 1500 years from a blue hole on South Andros Island on the Great Bahama Bank. This record is corroborated by shorter reconstructions from cores collected at two nearby blue holes. The record contains coarse‐grained event deposits attributable to known historical hurricane strikes within age uncertainties. Over the past 1500 years, South Andros shows evidence of four active periods of hurricane activity. None of these active intervals occurred in the past 163 years. We suggest that Intertropical Convergence Zone position modulates hurricane activity on the island based on a correlation with Cariaco Basin titanium concentrations. An anomalous gap in activity on South Andros Island in the early 13th century corresponds to a period of increased volcanism. The patterns of hurricane activity reconstructed from South Andros Island closely match those from the northeastern Gulf of Mexico but are anti‐phased with records from New England. We suggest that either changes in local environmental conditions (e.g., SSTs) or a northeastward shift in storm tracks can account for the increased activity in the western North Atlantic when the Gulf of Mexico and southeastern Caribbean are less active.