石鑫, 宋金明, 李学刚, 李宁. 海洋古pH重建的技术方法[J]. 海洋环境科学, 2019, 38(6): 954-962. DOI: 10.12111/j.mes20190620
引用本文: 石鑫, 宋金明, 李学刚, 李宁. 海洋古pH重建的技术方法[J]. 海洋环境科学, 2019, 38(6): 954-962. DOI: 10.12111/j.mes20190620
SHI Xin, SONG Jin-ming, LI Xue-gang, LI Ning. Methods for reconstruction of oceanic paleo-pH[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2019, 38(6): 954-962. DOI: 10.12111/j.mes20190620
Citation: SHI Xin, SONG Jin-ming, LI Xue-gang, LI Ning. Methods for reconstruction of oceanic paleo-pH[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2019, 38(6): 954-962. DOI: 10.12111/j.mes20190620

海洋古pH重建的技术方法

Methods for reconstruction of oceanic paleo-pH

  • 摘要: 重建海洋古pH对于海洋酸化进程研究具有重要意义。本文对海洋古pH反演的硅藻组合、硼同位素组成及B/Ca、brGDGTs及3-羟基脂肪酸等技术方法进行了归纳和总结。硅藻组合法系根据沉积物中保存的硅藻的种类和丰度重建水体的古pH,在湖泊研究中有较多成功的应用;硼同位素组成及B/Ca法基于海洋钙质生物中δ11B或B/Ca的变化重建海水pH,brGDGTs法是基于沉积物中brGDGTs的环化指数或异构化程度重建过去海水pH,3-羟基脂肪酸法是基于沉积物中3-羟基脂肪酸的支链比反演海洋古pH。这些海洋古pH的反演技术方法各有特点,就目前而言,仅硼同位素组成及B/Ca法是追溯海洋古pH变化较为成熟的方法。研发海洋古pH反演新技术方法至关重要,完善现有方法构建更加准确精密的海洋古pH重建指标体系任重而道远。

     

    Abstract: Based on the significantly implication of marine paleo-pH reconstruction to ocean acidification study, different proxies including diatom assemblage, boron isotope composition (δ11B) and B/Ca, brGDGTs and 3-hydroxy fatty acid and their paleo-pH reconstructing methods were summarized in this study.The diatom assemblage, which has been successfully applied with lake sediments, could rebuild oceanic paleo-pH by extract information from the diatoms species and abundance record.Likewise, the δ11B and B/Ca records in marine calcareous organisms were widely used to reconstruct pH in seawater.Both the degree of cyclization or isomerization of brGDGTs and the branching ratio of 3-hydroxy fatty acids could be influenced by the pH level of ambient environment, so the sediment fingerprints of these indicators were used to reconstruct marine paleo-pH.All the approaches have their own merits and demerits, however, δ11B and B/Ca are the most mature indicators for tracing changes of oceanic paleo-pH.Consequently, exploring new methods and improving current techniques are necessary, also of crucial importance for producing more accurate index of oceanic paleo-pH rebuilding.

     

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