Experimental determination of the temperature dependence of oxygen-isotope fractionation between water and chitinous head capsules of chironomid larvae

Experimental determination of the temperature dependence of oxygen-isotope fractionation between water and chitinous head capsules of chironomid larvae
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摇蚊幼虫水与几丁质头囊之间氧同位素分馏温度依赖性的实验测定

DOI:
10.1007/s10933-021-00191-z
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发表时间:
2021
影响因子:
2.1
通讯作者:
Lombino A
Lombino A
中科院分区:
地球科学3区
文献类型:
--
作者:
Lombino A

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保存在湖泊沉积物中的无脊椎动物角质层氧同位素值已被用于古环境重建,一般假设角质层与水之间的氧同位素分馏与温度无关。我们在实验室中用标记的氧同位素水培养摇蚊幼虫,并在5至25摄氏度的严格控制的温度范围内培养摇蚊幼虫,以验证摇蚊头囊和水之间氧同位素分馏()与温度无关的假设。结果表明,这一假设是可以否定的,并且随着温度的升高而减小。数据的分散性表明,需要进一步的实验来验证这种关系。然而,这些结果表明,当使用摇摆体δ18O作为古环境替代物时,应该考虑水温的温度依赖性,特别是在摇摆体数据与方解石等分馏依赖于温度的其他物质的氧同位素值相结合的情况下,以便得到过去水温的重建。
Oxygen-isotope values of invertebrate cuticle preserved in lake sediments have been used in palaeoenvironmental reconstructions, generally with the assumption that fractionation of oxygen isotopes between cuticle and water () is independent of temperature. We cultured chironomid larvae in the laboratory with labelled oxygen-isotope water and across a range of closely controlled temperatures from 5 to 25 °C in order to test the hypothesis that fractionation of oxygen isotopes between chironomid head capsules and water () is independent of temperature. Results indicate that the hypothesis can be rejected, and thatdecreases with increasing temperature. The scatter in the data suggests that further experiments are needed to verify the relationship. However, these results indicate that temperature-dependence ofshould be considered when chironomid δ18O is used as a paleoenvironmental proxy, especially in cases where data from chironomids are combined with oxygen-isotope values from other materials for which fractionation is temperature dependent, such as calcite, in order to derive reconstructions of past water temperature.
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