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DOI	10.5194/cp-15-91-2019
	The 405 kyr and 2.4 Myr eccentricity components in Cenozoic carbon isotope records
	Kocken I.J.; Cramwinckel M.J.; Zeebe R.E.; Middelburg V.J.; Sluijs A.
发表日期	2019
ISSN	18149324
起始页码	91
结束页码	104
卷号	15 期号:1
英文摘要	Cenozoic stable carbon (13C) and oxygen (18O) isotope ratios of deep-sea foraminiferal calcite co-vary with the 405 kyr eccentricity cycle, suggesting a link between orbital forcing, the climate system, and the carbon cycle. Variations in 18O are partly forced by ice-volume changes that have mostly occurred since the Oligocene. The cyclic 13C-18O co-variation is found in both ice-free and glaciated climate states, however. Consequently, there should be a mechanism that forces the 13C cycles independently of ice dynamics. In search of this mechanism, we simulate the response of several key components of the carbon cycle to orbital forcing in the Long-term Ocean-atmosphere-Sediment CArbon cycle Reservoir model (LOSCAR). We force the model by changing the burial of organic carbon in the ocean with various astronomical solutions and noise and study the response of the main carbon cycle tracers. Consistent with previous work, the simulations reveal that low-frequency oscillations in the forcing are preferentially amplified relative to higher frequencies. However, while oceanic 13C mainly varies with a 405 kyr period in the model, the dynamics of dissolved inorganic carbon in the oceans and of atmospheric CO2 are dominated by the 2.4 Myr cycle of eccentricity. This implies that the total ocean and atmosphere carbon inventory is strongly influenced by carbon cycle variability that exceeds the timescale of the 405 kyr period (such as silicate weathering). To test the applicability of the model results, we assemble a long ( 22 Myr) 13C and 18O composite record spanning the Eocene to Miocene (34-12 Ma) and perform spectral analysis to assess the presence of the 2.4 Myr cycle. We find that, while the 2.4 Myr cycle appears to be overshadowed by long-term changes in the composite record, it is present as an amplitude modulator of the 405 and 100 kyr eccentricity cycles. © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	atmosphere-ocean coupling; carbon cycle; carbon isotope; Cenozoic; climate change; deep-sea organism; eccentricity; Eocene; foraminifera; historical record; isotopic ratio; land-sea interaction; Miocene; Oligocene; orbital forcing; oscillation; oxygen isotope
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146864
作者单位	Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, Utrecht, 3584 CB, Netherlands; Department of Oceanography, University of Hawai'i at Mnoa, 1000 Pope Road, Honolulu, HI 96822, United States
推荐引用方式 GB/T 7714	Kocken I.J.,Cramwinckel M.J.,Zeebe R.E.,et al. The 405 kyr and 2.4 Myr eccentricity components in Cenozoic carbon isotope records[J],2019,15(1).
APA	Kocken I.J.,Cramwinckel M.J.,Zeebe R.E.,Middelburg V.J.,&Sluijs A..(2019).The 405 kyr and 2.4 Myr eccentricity components in Cenozoic carbon isotope records.Climate of the Past,15(1).
MLA	Kocken I.J.,et al."The 405 kyr and 2.4 Myr eccentricity components in Cenozoic carbon isotope records".Climate of the Past 15.1(2019).