Middle Holocene daily light cycle reconstructed from the strontium/calcium ratios of a fossil giant clam shell.
Middle Holocene daily light cycle reconstructed from the strontium/calcium ratios of a fossil giant clam shell.
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DOI：
10.1038/srep08734
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发表时间：
2015-03-04
影响因子：
4.6
通讯作者：
Watanabe T
中科院分区：
文献类型：
--
作者：
Hori M;Sano Y;Ishida A;Takahata N;Shirai K;Watanabe T
日照是气象数据的重要组成部分，因为太阳能是天气和气候的主要和直接驱动力。以前的分析显示，养殖的大蛤蜊壳的Sr/Ca比的日变化，这可能反映了每天的光周期的影响。我们采用代理方法从史前时代，在日本南部的石垣岛收集的化石巨大的蛤蜊壳样品。该标本在全新世中期是活的，因此暴露在末次冰期后最温暖的气候中。这种双壳类物种是已知的，每天形成一条生长线，证实了使用电子探针和易化年龄模型的Sr富集带的分析。我们分析了Sr/Ca，Mg/Ca和Ba/Ca比率沿着生长轴，使用NanoSIMS以2 μ m的间隔测量2 μm的斑点尺寸。冬季各层的Sr/Ca比值具有明显的日变化特征，由高Sr/Ca比值的窄生长线和低Sr/Ca比值的宽生长带组成。这些变化，这是一致的，与养殖的蛤蜊壳，表明重建的太阳辐射的变化在中全新世在多小时分辨率的潜力。
Insolation is an important component of meteorological data because solar energy is the primary and direct driver of weather and climate. Previous analyses of cultivated giant clam shells revealed diurnal variation in the Sr/Ca ratio, which might reflect the influence of the daily light cycle. We applied proxy method to sample from prehistoric era, a fossil giant clam shell collected at Ishigaki Island in southern Japan. The specimen was alive during the middle Holocene and thus exposed to the warmest climate after the last glacial period. This bivalve species is known to form a growth line each day, as confirmed by the analysis of the Sr enrichment bands using EPMA and facilitated age-model. We analyzed the Sr/Ca, Mg/Ca and Ba/Ca ratios along the growth axis, measuring a 2-μm spot size at 2-μm interval using NanoSIMS. The Sr/Ca ratios in the winter layers are characterized by a striking diurnal cycle consisting of narrow growth lines with high Sr/Ca ratios and broad growth bands with low Sr/Ca ratios. These variations, which are consistent with those of the cultivated clam shell, indicate the potential for the reconstruction of the variation in solar insolation during the middle Holocene at a multi-hourly resolution.
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影响因子：
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作者：
BONHAM, K
通讯作者：
BONHAM, K
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