气候变化领域集成服务门户(CCPortal): Last Interglacial sea surface warming during the sea-level highstand in the Canary Islands: Implications for the Canary Current and the upwelling off African coast

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DOI	10.1016/j.quascirev.2020.106246
	Last Interglacial sea surface warming during the sea-level highstand in the Canary Islands: Implications for the Canary Current and the upwelling off African coast
	Maréchal C.; Boutier A.; Mélières M.-A.; Clauzel T.; Betancort J.F.; Lomoschitz A.; Meco J.; Fourel F.; Barral A.; Amiot R.; Lécuyer C.
发表日期	2020
ISSN	0277-3791
卷号	234
英文摘要	The Canary Islands, east of the North Atlantic Ocean (27°N-29°N), are under the influence of the Canary Current, the descending branch of the North Atlantic Gyre, which is modulated by coastal upwelling off North-West Africa. They constitute strategic sites for palaeoclimatic reconstructions, especially for the Last Interglacial (LIG, 129 to 116 ky BP) estimated to be warmer than present. Seventy-four carbon and oxygen isotope bulk analyses and time series measurements were performed on 32 aragonitic mollusc shells from the LIG marine deposits on Lanzarote and Fuerteventura islands during a period of sea-level highstand that we estimated to occur between ≈125 and 119-116 ky BP. Our SST calculations, inferred from shell δ18O values using available isotopic fractionation equations, provide a seasonal SST amplitude ranging from 3.5 °C to 6.0 °C, in agreement with the modern seasonal amplitude, along with a mean SST comprised between 20.4 ± 1.3 °C and 22.2 ± 1.2 °C. With respect to the pre-industrial times, we deduce a positive SST anomaly in the range of +1.0 ± 1.4 °C to +2.8 ± 1.3 °C, consistent with the presence of the species Persististrombus latus, typical of warm SSTs. Although this finding does not match with the zonal negative anomaly of a reconstructed SST at low latitudes of the North Atlantic, it is nevertheless corroborated by other climate reconstructions in the northeastern tropical Atlantic region. We attribute this trend to an excess of summer insolation during the LIG which warmed the Canary Current, enhanced by a weakening of the North African upwelling. The entire North Atlantic Gyre was probably warmer during the LIG. © 2020 Elsevier Ltd
英文关键词	Canary current; Climate change; LIG; MIS5e; Molluscs; North Atlantic Gyre; Sea surface temperature; Sea-level; Stable isotopes; Upwelling
语种	英语
scopus关键词	Climate change; Isotopes; Molluscs; Surface waters; Time series analysis; MIS5e; North Atlantic; Sea surface temperature (SST); Stable isotopes; Upwelling; Sea level; anomaly; isotopic fractionation; Last Interglacial; mollusc; oxygen isotope; sea surface; time series analysis; upwelling; warming; Atlantic Ocean; Atlantic Ocean (North); Canary Current; Canary Islands; Fuerteventura; Lanzarote; Las Palmas; Spain; West Africa; Mollusca
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151525
作者单位	Observatoire des Sciences de l'Univers de Lyon, Université Claude Bernard Lyon 1, France; Dipartimento Scienze della Terra, Università degli Studi di Torino, Via Valperga Caluso 35, Torino, 10125, Italy; African Patterns, Scientist committee, 23 Rue St Sulpice, Paris, 75006, France; Laboratoire de Géologie de Lyon, CNRS UMR 5276, Université Claude Bernard Lyon 1, France; Departamento de Biología, Universidad de Las Palmas de Gran Canaria, ULPGC, Las Palmas de Gran Canaria, Canary Islands 35017, Spain; Instituto de Oceanografía y Cambio Global, IOCAG – Unidad Asociada de I+D+i al CSIC, Universidad de Las Palmas de Gran Canaria, ULPGC, Las Palmas de Gran Canaria, Canary Islands 35017, Spain; Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés, CNRS UMR 5023, Université Claude Bernard Lyon 1, France
推荐引用方式 GB/T 7714	Maréchal C.,Boutier A.,Mélières M.-A.,et al. Last Interglacial sea surface warming during the sea-level highstand in the Canary Islands: Implications for the Canary Current and the upwelling off African coast[J],2020,234.
APA	Maréchal C..,Boutier A..,Mélières M.-A..,Clauzel T..,Betancort J.F..,...&Lécuyer C..(2020).Last Interglacial sea surface warming during the sea-level highstand in the Canary Islands: Implications for the Canary Current and the upwelling off African coast.Quaternary Science Reviews,234.
MLA	Maréchal C.,et al."Last Interglacial sea surface warming during the sea-level highstand in the Canary Islands: Implications for the Canary Current and the upwelling off African coast".Quaternary Science Reviews 234(2020).