气候变化领域集成服务门户(CCPortal): Evidence for a regional warm bias in the Early Cretaceous TEX86 record

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DOI	10.1016/j.epsl.2020.116184
	Evidence for a regional warm bias in the Early Cretaceous TEX86 record
	Steinig S.; Dummann W.; Park W.; Latif M.; Kusch S.; Hofmann P.; Flögel S.
发表日期	2020
ISSN	0012821X
卷号	539
英文摘要	The Cretaceous Period (145-66 Ma) provides an opportunity to obtain insights into the adaptation of the climate system to increased atmospheric greenhouse gas concentrations. The organic paleothermometer TEX86 is one of the few proxies available for reconstructing quantitative estimates of upper ocean temperatures of this time period. Here we show that the sedimentary TEX86 signal in the Early Cretaceous North and South Atlantic shows systematic differences to other Cretaceous samples. In particular, the relative increase in the fractional abundances of the crenarchaeol isomer compared to crenarchaeol exhibits similarities with surface sediments from the modern Mediterranean and Red Sea. Dedicated climate model simulations suggest that the formation of warm and saline deep waters in the restricted North and South Atlantic may have influenced TEX86 export dynamics leading to a warm bias in reconstructed upper ocean temperatures. Applying a regional calibration from the modern Mediterranean and Red Sea to corresponding TEX86 data significantly improves the model-data fit for the Aptian Oceanic Anoxic Event 1a and the overall comparison with other temperature proxies for the Early Cretaceous. Our results demonstrate the need to consider regional and temporal changes of the TEX86-temperature relation for the reconstruction of deep-time ocean temperatures. © 2020 Elsevier B.V.
关键词	climate modelling Cretaceous GDGTs OAE 1a paleotemperature TEX86
英文关键词	Greenhouse gases; Cretaceous; GDGTs; OAE 1a; Paleotemperatures; TEX86; Climate models; anoxic conditions; climate modeling; Cretaceous; geological record; lipid; paleoceanography; paleotemperature; reconstruction; regional climate; sea surface temperature; thermometry; Atlantic Ocean; Atlantic Ocean (North); Atlantic Ocean (South); Indian Ocean; Mediterranean Sea; Red Sea [Indian Ocean]
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202908
作者单位	GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, 24148, Germany; Institute of Geology and Mineralogy, University of Cologne, Zülpicher Str. 49a, Cologne, 50674, Germany; Cluster of Excellence “The Future Ocean”, Kiel University, Christian-Albrechts-Platz 4, Kiel, 24118, Germany; University of Cologne-Centre for Accelerator Mass Spectrometry, Bernhard-Feilchenfeld-Str. 11, Cologne, 50969, Germany
推荐引用方式 GB/T 7714	Steinig S.,Dummann W.,Park W.,et al. Evidence for a regional warm bias in the Early Cretaceous TEX86 record[J],2020,539.
APA	Steinig S..,Dummann W..,Park W..,Latif M..,Kusch S..,...&Flögel S..(2020).Evidence for a regional warm bias in the Early Cretaceous TEX86 record.Earth and Planetary Science Letters,539.
MLA	Steinig S.,et al."Evidence for a regional warm bias in the Early Cretaceous TEX86 record".Earth and Planetary Science Letters 539(2020).