A 7000 year record of paleohurricane activity from a coastal wetland in Belize
A 7000 year record of paleohurricane activity from a coastal wetland in Belize
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DOI：
10.1177/0959683612460782
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发表时间：
2013-02-01
期刊：
影响因子：
2.4
通讯作者：
Liu, Kam-biu
中科院分区：
文献类型：
--
作者：
McCloskey, Terrence A.;Liu, Kam-biu
沉积古温学研究证明，至少自全新世中期以来，北大西洋的热带气旋活动水平一直具有显著波动的特点，活动周期通常从几个世纪持续到2000年。这些活动水平的估计是基于特定地点的飓风袭击历史，这些历史来自于归因于登陆主要飓风的冲刷事件的代理记录。在这里，我们展示了中美洲沿海伯利兹两个相邻湿地站点7000年的综合记录，记录了热带气旋产生的风暴潮和大降水事件。尽管总体敏感性似乎随着时间的推移而降低，但这一记录显示出明显不同的活动模式之间持续振荡的明显证据，每个活跃和平静时期都覆盖了记录的50%。活跃期类似于200-600BP、1450-2600BP、3200-4200BP、4750-5450BP、5750-6050BP和6700-6900BP。这一活动模式与墨西哥湾北部、加勒比海北部或美国大西洋沿岸的区域记录不符，从而支持了整个北大西洋活动模式在时间上是可变的，并且不是整个盆地同时发生多动症的观点。
Sedimentary paleotempestological studies have documented that tropical cyclone activity levels in the North Atlantic have been characterized by significant fluctuations since at least the mid Holocene, with activity regimes typically lasting from several centuries to > 2000 years. These activity-level estimates are based on site-specific hurricane strike histories derived from proxy records of overwash events attributed to landfalling major hurricanes. Here we present a 7000 year composite record from two adjacent wetland sites in coastal Belize, Central America that records both tropical cyclone-generated storm surges and large precipitation events. Although overall sensitivity appears to decrease over time, this record displays clear evidence of continuous oscillation between distinctly different activity regimes, with active and quiet periods each covering similar to 50% of the record. Active periods occur during similar to 200-600 BP, 1450-2600 BP, 3200-4200 BP, 4750-5450 BP, 5750-6050 BP, and 6700-6900 BP. This activity pattern does not match regional records from the northern Gulf of Mexico, the northern Caribbean or the Atlantic coast of the USA, thereby supporting the view that activity patterns are temporally variable throughout the North Atlantic, and that hyperactivity does not occur simultaneously across the entire basin.