globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116184
论文题名:
Evidence for a regional warm bias in the Early Cretaceous TEX86 record
作者: Steinig S.; Dummann W.; Park W.; Latif M.; Kusch S.; Hofmann P.; Flögel S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 539
语种: 英语
中文关键词: 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]
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165286
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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

Recommended Citation:
Steinig S.,Dummann W.,Park W.,et al. Evidence for a regional warm bias in the Early Cretaceous TEX86 record[J]. Earth and Planetary Science Letters,2020-01-01,539
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