Geochemical and Microstructural Signals in Giant Clam Tridacna maxima Recorded Typhoon Events at Okinotori Island, Japan
Geochemical and Microstructural Signals in Giant Clam Tridacna maxima Recorded Typhoon Events at Okinotori Island, Japan
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DOI：
10.1029/2017jg004082
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发表时间：
2018-05
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影响因子：
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通讯作者：
Taro Komagoe;Tsuyoshi Watanabe;K. Shirai;A. Yamazaki;Mitsuo Uematu
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作者：
Taro Komagoe;Tsuyoshi Watanabe;K. Shirai;A. Yamazaki;Mitsuo Uematu
为了验证砗磲壳作为台风等短期环境变化记录器的可用性，我们于2006年6月15日从日本冲之鸟岛采集了一只活砗磲。测量了砗磲壳样品中的生长增量厚度、稳定同位素比（δ18Oshell、δ13Cshell）和钡/钙比（Ba/Ca），并与冲之鸟岛仪器环境进行了比较。数据。根据 δ18O 贝壳剖面与海面温度的比较估计，在贝壳样本的外层，每年有 365 ± 6 的生长增量。标本中的生长增量每天都会形成，因此，通过计算生长增量可以确定δ18Oshell、δ13Cshell和Ba/Ca比值采样点的日期。台风逼近后，增量厚度减少，生长增量受到一些干扰。壳层Ba/Ca比值和δ18O壳层的正峰对应于台风导致的海面温度降低。这些结果表明，砗磲贝壳的微观结构和地球化学记录可用于探测过去的台风事件。
To validate the usability of the giant clam shell as a recorder of short‐term environmental changes such as typhoons, we collected a live Tridacna maxima from Okinotori Island, Japan, on 15 June 2006. Growth increment thickness, stable isotope ratio (δ18Oshell, δ13Cshell), and the barium/calcium ratio (Ba/Ca) in the T. maxima shell sample were measured and compared to Okinotori Island instrumental environmental data. In the outer layer of the shell sample, there were 365 ± 6 growth increments per year, as estimated by the δ18Oshell profile compared with sea surface temperature. The growth increments in the specimen were formed daily, and thus, we can determine the date of the sampling points of δ18Oshell, δ13Cshell and the Ba/Ca ratio by counting growth increments. After typhoon approach, there is a decrease in increment thickness and some disturbed growth increments. The positive peaks in the shell Ba/Ca ratio and δ18Oshell corresponded to lower sea surface temperature caused by typhoons. These results indicated that the microstructural and geochemical record in Tridacna maxima shells could be useful for detecting past typhoon events.