气候变化领域集成服务门户(CCPortal): Insensitivity of alkenone carbon isotopes to atmospheric CO2 at low to moderate CO2 levels

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DOI	10.5194/cp-15-539-2019
	Insensitivity of alkenone carbon isotopes to atmospheric CO2 at low to moderate CO2 levels
	Badger M.P.S.; Chalk T.B.; Foster G.L.; Bown P.R.; Gibbs S.J.; Sexton P.F.; Schmidt D.N.; Pälike H.; Mackensen A.; Pancost R.D.
发表日期	2019
ISSN	18149324
起始页码	539
结束页码	554
卷号	15 期号:2
英文摘要	Atmospheric pCO2 is a critical component of the global carbon system and is considered to be the major control of Earth's past, present, and future climate. Accurate and precise reconstructions of its concentration through geological time are therefore crucial to our understanding of the Earth system. Ice core records document pCO2 for the past 800 kyr, but at no point during this interval were CO2 levels higher than today. Interpretation of older pCO2 has been hampered by discrepancies during some time intervals between two of the main ocean-based proxy methods used to reconstruct pCO2: the carbon isotope fractionation that occurs during photosynthesis as recorded by haptophyte biomarkers (alkenones) and the boron isotope composition (δ11B) of foraminifer shells. Here, we present alkenone and δ11B-based pCO2 reconstructions generated from the same samples from the Pliocene and across a Pleistocene glacial- interglacial cycle at Ocean Drilling Program (ODP) Site 999. We find a muted response to pCO2 in the alkenone record compared to contemporaneous ice core and δ11B records, suggesting caution in the interpretation of alkenone-based records at low pCO2 levels. This is possibly caused by the physiology of CO2 uptake in the haptophytes. Our new understanding resolves some of the inconsistencies between the proxies and highlights that caution may be required when interpreting alkenone-based reconstructions of pCO2. © Author(s) 2019..
语种	英语
scopus关键词	alga; alkenone; biomarker; carbon dioxide; concentration (composition); glacial-interglacial cycle; ice core; isotopic fractionation; Ocean Drilling Program; photosynthesis; physiology; Pleistocene; reconstruction; Foraminifera; Haptophyceae
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/146838
作者单位	School of Environment, Earth and Ecosystem Sciences, Open University, Milton Keynes, MK7 6AA, United Kingdom; Organic Geochemistry Unit, School of Chemistry, School of Earth Sciences, University of Bristol, Bristol, BS8 1TS, United Kingdom; School of Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, SO14 3ZH, United Kingdom; Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Earth Sciences, University College London, London, WC1E 6BT, United Kingdom; School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol, BS8 1RJ, United Kingdom; Cabot Institute, University of Bristol, Bristol, BS8 1UJ, United Kingdom; MARUM - Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany; Alfred Wegener Institute for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, Germany
推荐引用方式 GB/T 7714	Badger M.P.S.,Chalk T.B.,Foster G.L.,et al. Insensitivity of alkenone carbon isotopes to atmospheric CO2 at low to moderate CO2 levels[J],2019,15(2).
APA	Badger M.P.S..,Chalk T.B..,Foster G.L..,Bown P.R..,Gibbs S.J..,...&Pancost R.D..(2019).Insensitivity of alkenone carbon isotopes to atmospheric CO2 at low to moderate CO2 levels.Climate of the Past,15(2).
MLA	Badger M.P.S.,et al."Insensitivity of alkenone carbon isotopes to atmospheric CO2 at low to moderate CO2 levels".Climate of the Past 15.2(2019).