气候变化领域集成服务门户(CCPortal): Temporal variability of flooding events of Guadiana River (Iberian Peninsula) during the middle to late Holocene: Imprints in the shallow-marine sediment record

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DOI	10.1016/j.palaeo.2020.109900
	Temporal variability of flooding events of Guadiana River (Iberian Peninsula) during the middle to late Holocene: Imprints in the shallow-marine sediment record
	Mendes I.; Lobo F.J.; Hanebuth T.J.J.; López-Quirós A.; Schönfeld J.; Lebreiro S.; Reguera M.I.; Antón L.; Ferreira Ó.
发表日期	2020
ISSN	0031-0182
卷号	556
英文摘要	Sedimentological, geochemical and benthic foraminiferal proxies were used to interpret changes of depositional environments in a mud entrapment inside the Guadiana River paleo-valley, northern Gulf of Cadiz, to understand the temporal variability of fluvial flooding events and to detect patterns of latitudinal climatic variability in western Iberia. The period between ca. 5800 and ca. 1250 cal yr BP was characterized by slowly accumulating coarse-grained sediments, high content of biogenic sand components, and high abundances of shallow-water benthic foraminiferal species. After ca. 1250 cal yr BP, the sedimentary environment was dominated by fine-grained sediments, with high abundances of opportunistic benthic foraminiferal species and successful colonizers, and high values of geochemical ratios indicative of enhanced terrigenous supply. Sedimentation rates increased drastically over the last ca. 500 years. The genesis of these environments was mainly driven by the variable frequency of fluvial flooding events driven by the regional climate variability. Low terrigenous sediment input under dry conditions prevailed in the older sedimentary unit. Flood frequency and terrigenous sediment supply increased during the younger unit. The variability of the North Atlantic Oscillation at centennial scales highly influenced the sediment supply during the last ca. 500 years, with high terrigenous supply during negative NAO conditions. Our results corroborate an N-S gradient along the Atlantic Iberia during middle and late Holocene, with more humid conditions in the northwestern and drier conditions towards the southeast. The gradient weakened over the past ca. 500 years, with increased rainfalls and flood events during the Little Ice Age. © 2020 Elsevier B.V.
英文关键词	Benthic foraminifera; Climate dynamics; Gulf of Cadiz; Mud depocenter; North Atlantic Oscillation; XRF element ratios
语种	英语
scopus关键词	benthic foraminifera; climate variation; depositional environment; flooding; Holocene; latitudinal gradient; Little Ice Age; marine sediment; North Atlantic Oscillation; sedimentation rate; shallow water; temporal variation; Atlantic Ocean; Guadiana River; Gulf of Cadiz; Iberian Peninsula; Foraminifera
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150379
作者单位	Centro de Investigação Marinha e Ambiental (CIMA), Universidade do Algarve, Faro, Portugal; Instituto Andaluz de Ciencias de la Tierra (CSIC-Universidad de Granada), Granada, Spain; Department of Coastal and Marine Systems Science, Coastal Carolina University, Conway, SC, United States; GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Kiel, Germany; Instituto Geológico y Minero de España (IGME), Madrid, Spain
推荐引用方式 GB/T 7714	Mendes I.,Lobo F.J.,Hanebuth T.J.J.,et al. Temporal variability of flooding events of Guadiana River (Iberian Peninsula) during the middle to late Holocene: Imprints in the shallow-marine sediment record[J],2020,556.
APA	Mendes I..,Lobo F.J..,Hanebuth T.J.J..,López-Quirós A..,Schönfeld J..,...&Ferreira Ó..(2020).Temporal variability of flooding events of Guadiana River (Iberian Peninsula) during the middle to late Holocene: Imprints in the shallow-marine sediment record.Palaeogeography, Palaeoclimatology, Palaeoecology,556.
MLA	Mendes I.,et al."Temporal variability of flooding events of Guadiana River (Iberian Peninsula) during the middle to late Holocene: Imprints in the shallow-marine sediment record".Palaeogeography, Palaeoclimatology, Palaeoecology 556(2020).