Testing coral-based tropical cyclone reconstructions: An example from Puerto Rico
Testing coral-based tropical cyclone reconstructions: An example from Puerto Rico
复制标题
DOI：
10.1016/j.palaeo.2011.04.027
复制
发表时间：
2011-07
期刊：
影响因子：
--
通讯作者：
K. H. Kilbourne;R. Moyer;T. Quinn;A. Grottoli
中科院分区：
文献类型：
--
作者：
K. H. Kilbourne;R. Moyer;T. Quinn;A. Grottoli
补充热带气旋活动的现代记录与更长的历史和古气候记录将增加我们对自然热带气旋变化的理解在十年到百年的时间尺度。热带气旋产生的大量降水的δ 18 O值明显低于正常降水，因此，在海洋碳酸盐δ 18 O记录中，可被地球化学识别为负δ 18 O异常。本研究探讨珊瑚骨骼δ 18 O作为重建过去热带气旋事件的一种手段的有用性。降雨与海水混合的同位素模拟表明，在珊瑚生长时，从热带气旋中检测同位素信号需要~ 33 psu的盐度，但这个阈值取决于新鲜和含盐端员的同位素组成。珊瑚δ 18 O和历史记录的热带气旋活动，河流流量，降水量从多个地点在波多黎各之间的比较表明，热带气旋是没有区别的珊瑚记录从正常降雨使用这种方法在这些网站。
Complimenting modern records of tropical cyclone activity with longer historical and paleoclimatological records would increase our understanding of natural tropical cyclone variability on decadal to centennial time scales. Tropical cyclones produce large amounts of precipitation with significantly lower δ18O values than normal precipitation, and hence may be geochemically identifiable as negative δ18O anomalies in marine carbonate δ18O records. This study investigates the usefulness of coral skeletal δ18O as a means of reconstructing past tropical cyclone events. Isotopic modeling of rainfall mixing with seawater shows that detecting an isotopic signal from a tropical cyclone in a coral requires a salinity of ~33psu at the time of coral growth, but this threshold is dependent on the isotopic composition of both fresh and saline end-members. A comparison between coral δ18O and historical records of tropical cyclone activity, river discharge, and precipitation from multiple sites in Puerto Rico shows that tropical cyclones are not distinguishable in the coral record from normal rainfall using this approach at these sites.