Drought in the northern Bahamas from 3300 to 2500 years ago
Drought in the northern Bahamas from 3300 to 2500 years ago
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DOI：
10.1016/j.quascirev.2018.02.014
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发表时间：
2018-04
影响因子：
4
通讯作者：
P. J. Hengstum;G. Maale;J. Donnelly;N. Albury;B. Onac;R. Sullivan;T. S. Winkler;A. Tamalavage;D. Macdonald
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文献类型：
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作者：
P. J. Hengstum;G. Maale;J. Donnelly;N. Albury;B. Onac;R. Sullivan;T. S. Winkler;A. Tamalavage;D. Macdonald
预计本世纪北大西洋副热带高压(NASH)的加强和西移将在季节和年度时间尺度上减少加勒比和美国东南部的降雨量。然而，需要从加勒比海北部获得更多的水文气候记录，以了解纳什的长期行为，并更好地预测它未来的行为。在这里，我们提出了一个多代理天坑湖重建从靠近纳什岛(阿巴科岛，巴哈马)的碳酸盐岛屿。重建表明巴哈马北部经历了从∼330年到∼2500Cal yars BP的干旱，这与来自其他水文气候和海洋记录(例如非洲、加勒比和南美洲)的证据一致，表明热带辐合带和北大西洋哈德利环流同步向南移动。加勒比海东北部地区3300年至2500年的水文气候变化的具体原因可能是∼南移或西移，这将增加加勒比海东北部对来自较高海拔的下沉空气的暴露。
Intensification and western displacement of the North Atlantic Subtropical High (NASH) is projected for this century, which can decrease Caribbean and southeastern American rainfall on seasonal and annual timescales. However, additional hydroclimate records are needed from the northern Caribbean to understand the long-term behavior of the NASH, and better forecast its future behavior. Here we present a multi-proxy sinkhole lake reconstruction from a carbonate island that is proximal to the NASH (Abaco Island, The Bahamas). The reconstruction indicates the northern Bahamas experienced a drought from ∼3300 to ∼2500 Cal yrs BP, which coincides with evidence from other hydroclimate and oceanographic records (e.g., Africa, Caribbean, and South America) for a synchronous southern displacement of the Intertropical Convergence Zone and North Atlantic Hadley Cell. The specific cause of the hydroclimate change in the northeastern Caribbean region from ∼3300 to 2500 Cal yrs BP was probably coeval southern or western displacement of the NASH, which would have increased northeastern Caribbean exposure to subsiding air from higher altitudes.