Clumped isotopes in land snail shells over China: Towards establishing a biogenic carbonate paleothermometer
Clumped isotopes in land snail shells over China: Towards establishing a biogenic carbonate paleothermometer
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中国陆地蜗牛壳中的聚集同位素：建立生物碳酸盐古温度计
DOI：
10.1016/j.gca.2019.04.028
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发表时间：
2019-07
影响因子：
5
通讯作者：
Ding Zhongli
中科院分区：
文献类型：
--
作者：
Zhai Jixuan;Wang Xu;Qin Ben;Cui Linlin;Zhang Shuhua;Ding Zhongli
陆生蜗牛化石在地质沉积中分布丰富，其同位素组成为确定古气候变化提供了手段。随着块状同位素(Δ-47)地温计的发展，近年来陆螺壳碳酸盐中的块状同位素研究取得了很大进展。尽管最近已经有了几次尝试，但到目前为止，还没有将陆生蜗牛的Δ47转换为环境温度的经验校准函数。在此，我们系统地分析了中国采集的两种常见陆生钉螺(慢螺和华螺)的簇状同位素(Δ-47)。结果表明，使用Δ47(T47)计算的两个物种的温度与研究地点的年平均温度(MAT)没有相关性。然而，T47-MAT偏移量与MAT呈负相关，这表明陆生蜗牛倾向于在较冷的地区在温暖的月份增加外壳，或在较冷的地区以不同的方式调节它们的体温。同时，在18个测点，中国钉螺的聚集温度比非洲蜗牛的聚集温度高3 4 ± 1 5 °C，这表明利用陆地蜗牛聚集同位素重建古温度需要物种特有的传递函数。在确定了不同地点陆生钉螺的适宜生长季持续时间后，我们建立了这两种陆生钉螺的Δ47-生长季温度传递函数。Δ47=(0.0513 ± 0.0036) × 106/T2+(0.0930 ± 0.0413)，其中Δ47用‰表示，T用K表示。天主教的校正函数为(R2= 0.80)：Δ47=(0.055 ± 0.011) × 106/T2+(0.035 ± 0.129)。根据CATAICASP的Δ47资料，成功地将CATAICA函数应用于中国中部黄土高原末次冰盛期和现代夏季(6-7-8月)平均温度的重建。由Eagle等人提供(2013a)。这证明了所构造的传递函数的有效性。此外，计算出的δ18O身体水(δ18OBW)与降雨量的δ18O(δ18Op)具有很强的相关性，特别是在中国北部，这表明该地区有可能追踪水文变化。相反，CATAICAδ18OBW与δ18Op之间没有直接的关系。这种物种间的复杂性值得进一步研究。
Land snail fossils are abundantly distributed in geological deposits and their isotopic compositions provide a means to determine paleoclimatic changes. With the development of the clumped isotopes (Δ47) geothermometer, many efforts have been made in recent years to study clumped isotopes in land snail shell carbonate. Although there have been several recent attempts, there is, as yet, no empirical calibration function to convert land snail Δ47to environmental temperature. Here, we systematically analyzed clumped isotopes (Δ47) of two common land snail species (BradybaenaandCathaica) from China. Results showed that temperatures calculated using the Δ47(T47) of both species did not correlate with the mean annual temperatures (MAT) at the study sites. However, the T47-MAT offset is negatively correlated to MAT, suggesting that land snails tend to add shell during the warmer months at colder sites or modulate their body temperature differently in colder regions. Meanwhile, clumped temperatures ofCathaicaare 3.4 ± 1.5 °C higher than those ofBradybaenaat 18 sites, indicating that a species-specific transfer function is needed to reconstruct paleotemperature using land snail clumped isotopes. After determining the proper duration of the growing season for land snails at different locations, we developed a Δ47-growth season temperature (GST) transfer function for the two species. The calibration function forBradybaenaland snails is expressed by a linear regression between 1/T2and absolute Δ47(R2= 0.94): Δ47= (0.0513 ± 0.0036) × 106/T2+ (0.0930 ± 0.0413), where Δ47is expressed in ‰ and T in K. The calibration function forCathaicais as follows (R2= 0.80): Δ47= (0.055 ± 0.011) × 106/T2+ (0.035 ± 0.129). The function forCathaicawas successfully applied to reconstruct mean summer (June-July-August) temperatures during the Last Glacial Maximum and modern times on the central Chinese Loess Plateau, based on Δ47data ofCathaicasp. provided by Eagle et al (2013a). This testifies to the validity of the aforementioned constructed transfer function. In addition, the calculated δ18O of body water (δ18OBW) forBradybaenashowed a robust correlation with the δ18O of rainfall (δ18Op), particularly in northern China, which points to the potential to trace hydrological changes in the region. In contrast,Cathaicaδ18OBWdid not show a straightforward relation to δ18Op. This inter-species complexity warrants further study.
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影响因子：
5.3
作者：
L. Stott
通讯作者：
L. Stott
DOI：
--
发表时间：
1985
期刊：
--
影响因子：
--
作者：
Dongsheng Liu
通讯作者：
Dongsheng Liu
影响因子：
4.4
作者：
MCCREA, JM
通讯作者：
MCCREA, JM
DOI：
10.1073/pnas.1213366110
发表时间：
2013-05
期刊：
Proceedings of the National Academy of Sciences
影响因子：
--
作者：
R. Eagle;C. Risi;Jonathan L. Mitchell;J. Eiler;U. Seibt;J. Neelin;Gaojun Li;A. Tripati
通讯作者：
R. Eagle;C. Risi;Jonathan L. Mitchell;J. Eiler;U. Seibt;J. Neelin;Gaojun Li;A. Tripati
DOI：
10.2110/palo.2005.p05.091r
发表时间：
2007-03
期刊：
--
影响因子：
--
作者：
L. Baldini;S. Walker;L. B. Railsback;J. Baldini;D. Crowe
通讯作者：
L. Baldini;S. Walker;L. B. Railsback;J. Baldini;D. Crowe