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• W2047492053 endingPage "33" @default.
• W2047492053 startingPage "11" @default.
• W2047492053 abstract "Two sedimentary sequences (coastal and subtidal) were studied in San Simón Bay (Ría de Vigo), situated on the Atlantic coast of NW Iberia. The coastal record is a shallowing upward sequence which evidences a locally-developed low marsh, situated below the current beach, and dated at the second half of the 4th century. During the following decades this low marsh was progressively replaced by an alder swamp which formed on it. This suggests an apparent stabilisation or slow-down of the relative sea-level (RSL), in this site, at the beginning of the Dark Ages (DA). The subtidal sequence studied reflects the main changes in the landscape, the hydrological conditions, climate and RSL affecting this part of NW Iberia during the last 1250 years. Evidence of changing dinocysts content in the sediment reveals that two centennial or decadal-scale episodes existed of shelf marine waters more intensely penetrating inside the bay: between the 15th-18th centuries and at ca 1800–1930 AD. Besides, we related different proxies with the occurrence of four main climatic stages, namely the previously described Dark Ages (DA, ca 350–750 AD), the Mediaeval Climatic Anomaly (MCA, ca 750–1100 AD) and the Little Ice Age (LIA. ca 1500–1930 AD); in addition we propose a regional MCA/LIA transition (ca 1100–1500 AD) that it has not been previously described. Our environmental characterization indicates a persistent North Atlantic Oscillation (NAO) negative mode domain in Ría de Vigo during the MCA, but this became weaker during the LIA and, probably, also during the earlier DA. NAO mode become more irregular during the MCA/LIA transition, generally persisting in dominant negative mode except for a phase of minor upwelling intensification, at ca 1150–1350 AD, which mainly affected the external parts of the ria. We postulate that an almost simultaneous phase (ca 1100–1350 AD) of stronger continental contribution in the sediments may be related to increasing storm intensities, probably linked to a reinforcement of the Easter Atlantic (EA) pattern; and also that the intertidal/supratidal ecosystems inside San Simón Bay may have extended further in the past, at least towards the end of the 5th century, and between ca 1050–1350 AD and ca 1450–1750 AD. A number of local historical references are consistent with our palaeoecological data and so support the chronology proposed as well as many of the environmental changes reconstructed. This good agreement will help in the interpretation of other analogous sequences extending back in time." @default.
• W2047492053 created "2016-06-24" @default.
• W2047492053 creator A5025391495 @default.
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• W2047492053 date "2014-06-01" @default.
• W2047492053 modified "2023-10-14" @default.
• W2047492053 title "Climate and anthropogenic factors influencing an estuarine ecosystem from NW Iberia: new high resolution multiproxy analyses from San Simón Bay (Ría de Vigo)" @default.
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• W2047492053 doi "https://doi.org/10.1016/j.quascirev.2014.03.021" @default.
• W2047492053 hasPublicationYear "2014" @default.

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