Stable carbon isotopes in paleoceanography: atmosphere, oceans, and sediments
Stable carbon isotopes in paleoceanography: atmosphere, oceans, and sediments
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DOI：
10.1016/j.earscirev.2019.102893
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发表时间：
2019-07
影响因子：
12.1
通讯作者：
A. Mackensen;G. Schmiedl
中科院分区：
文献类型：
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作者：
A. Mackensen;G. Schmiedl
碳是地球上生物和非生命化合物的关键元素之一。二氧化碳和甲烷是大气中重要的温室气体，溶解无机碳（DIC）和有机碳（DOC）决定着水体的地球化学，碳酸盐是海洋沉积物的主要组成成分。稳定碳同位素比值（13 C/12 C），以δ 13 C值表示，在现代地球科学中广泛使用。大气CO2的δ 13 CCO 2值反映了全球气候的演变和变化。海洋δ 13 CDIC被用作水团示踪剂，有助于量化海洋的人为CO2吸收。化石碳酸盐和底栖碳酸盐的δ 13 C值反映了古海洋环流模式和深水通风的变化，以及海面古生产力和海底甲烷释放的变化。沉积有机质的δ 13 COM值和有机分子生物标志物的化合物特征δ 13 C值反映了有机碳的陆源和海相来源。碳酸盐岩中δ 13 C的长期变化和漂移是重要的地层标志和联系点，本文综述了海水和生物碳酸盐岩中稳定碳同位素比值作为古海洋学代用指标的应用，包括海洋碳交换的大气和沉积储层。由于δ 13 C值在地球科学中的广泛应用，本文的综述并不一定是完整的;相反，我们专注于基于野外的稳定碳同位素研究及其在古海洋学中的意义。这可能有助于评估大气环流模型的结果，并促进新的创新代理的发展。
Carbon is one of the key elements in organisms and non-living compounds on Earth. Carbon dioxide and methane are important greenhouse gases in the atmosphere, dissolved inorganic (DIC) and organic carbon (DOC) determine water biogeochemistry, and carbonates are major constituents of marine sediments. Stable carbon isotope ratios (13C/12C), expressed as δ13C values, are widely used in modern Earth sciences. δ13CCO2values of atmospheric carbon dioxide reflect global climate evolution and change. Marine δ13CDICis used as water-mass tracer and helps quantifying the anthropogenic CO2uptake of the ocean. The δ13C values of fossil planktic and benthic carbonates indicate changes in circulation pattern and deep-water ventilation of ancient oceans, as well as paleoproductivity at the sea surface and methane release at the sea floor. The δ13COMvalues of sedimentary organic matter (OM) and compound-specific δ13C values of molecular organic biomarkers indicate whether the organic carbon is of marine or terrestrial provenience. Secular δ13C variations and excursions in carbonates are important stratigraphic marker and tie points.Here we review the application of stable carbon isotope ratios in ocean water and biogenic carbonates as proxies in paleoceanography, including the atmospheric and sedimentary reservoirs oceanic carbon is in exchange with. Due to the wide use of δ13C values in Earth sciences, this overview necessarily does not claim to be complete; rather we focus on field-based stable carbon isotope research and its significance in paleoceanography. This may assist in evaluating general circulation model results and foster development of new innovative proxies.