globalchange  > 气候变化与战略
DOI: 10.1016/j.marmicro.2019.101797
论文题名:
Possible linkage between the long-eccentricity marine carbon cycle and the deep-Pacific circulation: Western equatorial Pacific benthic foraminifera evidences of the last 4 Ma
作者: Dang H.; Peng N.; Ma X.; Wan S.; Jian Z.
刊名: Marine Micropaleontology
ISSN: 3778398
出版年: 2020
卷: 155
语种: 英语
英文关键词: Carbon cycle ; Long eccentricity cycle ; Pacific deep circulation ; Pleistocene ; Pliocene
Scopus关键词: benthic foraminifera ; biostratigraphy ; carbon cycle ; carbon isotope ; deep water ; eccentricity ; magnetostratigraphy ; marine environment ; Pleistocene ; Pliocene ; relative abundance ; Pacific Ocean ; Pacific Ocean (Equatorial) ; Cibicidoides ; Favocassidulina ; Foraminifera ; Uvigerina
英文摘要: The ~400-kyr period of marine carbon isotope records, in concert with the long eccentricity cycle, is a meaningful signature of the global carbon cycle, and this period was prolonged to ~500 kyr in the last ~1.6 Ma. The cause of the elongation of the long-eccentricity carbon cycle at ~1.6 Ma has not been fully understood, partly due to the conundrum of its relationship to changes in the circulation of deep-water masses. In this study, we present the benthic foraminifera δ13C and δ18O and the relative abundances of selected benthic foraminifera, from the upper ~80 m of Site U1489 of IODP Expedition 363. First, we established an age model for our samples, covering the last 4 Ma, based on the correlation of benthic foraminifera δ18O to the LR04 global stack as well as ship-board magneto-stratigraphy. Then we compared the δ18O and δ13C between Cibicidoides and Uvigerina to reconfirm the inter-genus isotopic adjustments. The coarse fraction, benthic foraminifera δ13C and the abundances of selected benthic species/genera show detectable 400–500 kyr cycles, with minimal coarse fraction and maximal δ13C around eccentricity minima. The variations in the relative abundances of selected benthic foraminifera, especially Favocassidulina favus, and the comparisons among deep-Pacific δ13C records, reveal a shift to a more sluggish mode of Pacific deep-water circulation occurring coincidently at ~1.6 Ma. Therefore, it may be implied that the lengthening of the long-term δ13C cycle at ~1.6 Ma is linked to a deep Pacific circulation change that prolonged the cycling of carbon in the ocean. © 2019 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159075
Appears in Collections:气候变化与战略

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作者单位: State Key Laboratory of Marine Geology, Tongji University, Shanghai, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China; CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China

Recommended Citation:
Dang H.,Peng N.,Ma X.,et al. Possible linkage between the long-eccentricity marine carbon cycle and the deep-Pacific circulation: Western equatorial Pacific benthic foraminifera evidences of the last 4 Ma[J]. Marine Micropaleontology,2020-01-01,155
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