A high-resolution δ18O record of modern Tridacna gigas bivalve and its paleoenvironmental implications

A high-resolution δ18O record of modern Tridacna gigas bivalve and its paleoenvironmental implications
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现代砗磲双壳类的高分辨率 Delta O-18 记录及其古环境意义

DOI:
10.1016/j.palaeo.2020.109800
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发表时间:
2020-09
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Haowen Dang
Haowen Dang
中科院分区:
其他
文献类型:
--
作者:
Xiaolin Ma;Hong Yan;Haobai Fei;Chengcheng Liu;Ge Shi;Enqing Huang;Yue Wang;Xiaoli Qu;Ergang Lian;Haowen Dang

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仪器时代之外月度解析的古环境记录的缺乏阻碍了我们对全球气候动态的全面了解。 砗磲在定量记录过去从日到年际时间尺度上海洋表面环境的变化方面具有巨大潜力,而砗磲地球化学指标的适用性有待定量研究。在这里,我们通过使用激光扫描共聚焦显微镜 (LSCM) 识别每日生长层,为来自南海南部 (SCS) 的巨型砗磲建立了年代表。我们1989年至2013年的高分辨率砗磲δ18Oshell记录显示,在年际时间尺度上,与当地降水量和厄尔尼诺南方涛动(ENSO)指数的变化具有高度相关性。结合观测到的海面温度(SST),我们根据砗磲δ18O记录计算了南海南部海水δ18O(δ18Osw)并推导了海面盐度(SSS)变化。我们的盐度预算计算结果表明,南海南部的SSS变化主要受到垂直混合和海面淡水通量的影响。我们的研究表明,巨型砗磲是热带海洋地区高分辨率和定量古环境重建的理想档案,从而为探索年和年际时间尺度上的古环境变化提供了新的窗口。
The lack of monthly-resolved paleoenvironmental records beyond the instrumental era hinders our full understanding of global climate dynamics.Tridacna gigasshells have a large potential to quantitatively document the variability of the ocean surface environment on time scales from daily to interannual in the past, while the applicability of the geochemical proxies ofTridacna gigasneeds to be quantitively investigated. Here we establish a chronology for aTridacna gigasshell from the southern South China Sea (SCS) by identifying daily growth laminae using a laser scanning confocal microscope (LSCM). Our high-resolutionTridacna gigasshell δ18Oshellrecord throughout 1989–2013 shows a high correlation with changes in local precipitation and the index of El Niño-Southern Oscillations (ENSO) on the interannual time scale. Together with observed sea surface temperature (SST), we calculated seawater δ18O (δ18Osw) and derived sea surface salinity (SSS) change in the southern SCS based on theTridacna gigasshell δ18O record. Our salinity-budget calculation results suggest that the SSS variability in the southern SCS is predominantly affected by the vertical mixing and sea surface freshwater flux. Our study reveals that theTridacna gigasshell is an ideal archive for high-resolution and quantitative paleoenvironmental reconstructions in tropical ocean regions, thus providing a new window to explore paleoenvironmental changes on annual and interannual time scales.
DOI: 10.1029/2010pa002043
发表时间: 2011-09
期刊: Paleoceanography
影响因子: --
作者:
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影响因子: 3.5
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