Calibrating branched GDGTs in bones to temperature and precipitation: Application to Alaska chronological sequences

Calibrating branched GDGTs in bones to temperature and precipitation: Application to Alaska chronological sequences
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根据温度和降水校准骨骼中的分支 G​​DGT:在阿拉斯加时间序列中的应用

DOI:
10.1016/j.quascirev.2020.106371
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发表时间:
2020-07
影响因子:
4
通讯作者:
Zheng Wang
Zheng Wang
中科院分区:
地球科学1区
文献类型:
--
作者:
Jiaju Zhao;Yongsong Huang;Yuan Yao;Zhisheng An;Yizhi Zhu;Hongxuan Lu;Zheng Wang

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我们最近的研究表明,支化甘油二烷基甘油四醚(brGDGT)在古骨骼可能有很大的潜力,重建原位古气候条件。然而,使用古骨骼中的brGDGT重建过去的气候和环境条件的一个主要问题是缺乏骨骼特有的校准。在这里,我们调查了中国191个现代风化骨样本中brGDGT的分布,这些样本具有广泛的年平均气温(MAAT:−3.3-25.6 °C)和年平均降水量(MAP:163-2062 mm),并首次提出了骨骼特异性brGDGT温度和降水校准。我们发现,与温度的最佳相关性被发现在骨骼中的6-甲基比5-甲基brGDGT异构体的比例较高,这表明优先生产6-甲基brGDGT的细菌内骨。骨特异性温度关系不同于已公布的矿物质土壤校准(例如,几乎不受土壤pH变化的影响)。我们假设较低的校准残差值是由于骨内细菌生长的均匀和半封闭环境比土壤环境更好。我们还表明,在半干旱和半湿润地区(MAP:200-710毫米),brGDGT分布在松质骨与相对较高的百分比6-甲基异构体与平均年降水量密切相关。将我们的骨骼特异性brGDGT校准应用于阿拉斯加年代序列,对过去30,000年的高纬度温度和降水变化产生了新的见解。
Our recent study suggests that branched glycerol dialkyl glycerol tetraethers (brGDGTs) in ancient bones may have great potential for reconstructing in-situ paleoclimate conditions. However, one major problem with reconstructing past climate and environmental conditions using brGDGTs in ancient bones is the lack of calibrations specific to bones. Here we investigate the distribution of brGDGTs in 191 modern weathered bone samples in China with a broad range of mean annual air temperature (MAAT: −3.3-25.6 °C) and mean annual precipitation (MAP: 163-2062 mm), and present the first bone-specific brGDGT temperature and precipitation calibrations. We find that the best correlation with temperature is found in bones with a higher ratio of 6-methyl over 5-methyl brGDGT isomers, suggesting a preferential production of 6-methyl brGDGTs by bacteria inside bones. The bone-specific temperature relationship is distinct from published mineral soil calibrations (e.g., with virtually no influence from soil pH changes). We hypothesize that the lower calibration residual values result from more homogenous and semi-closed environment for bacterial growth inside the bones than soil environments. We also demonstrate that, in semi-arid and semi-humid regions (MAP: 200-710 mm), brGDGT distributions in cancellous bones with relatively high percentages of 6-methyl isomers are strongly correlated with mean annual precipitation. Application of our bone-specific brGDGT calibrations to Alaskan chronological sequences yields new insights to high latitude temperature and precipitation variations for the past 30,000 years.
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