Palynological characterization of gassy sediments in the inner part of Ría de Vigo (NW Spain). New chronological and environmental data

Sobrino, Castor Muñoz; García‐Gil, Soledad; Diez, José B.; Iglesias, Jorge

doi:10.1007/s00367-007-0078-y

Cited by 21 publications

(24 citation statements)

References 21 publications

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“…12). Besides, matching upwelling variations (Muñoz Sobrino et al 2007b) and even sea level changes (Muñoz Sobrino et al 2008) have been recently reported in shallow coastal environments of NW Iberia since the midHolocene onwards. However, these episodes also coincide with some of the periods in which man has most actively disturbed the woodlands of this region ( Fig.…”

Section: Discussionmentioning

confidence: 94%

Climatic and human effects on the post-glacial dynamics of Fagus sylvatica L. in NW Iberia

et al. 2008

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Section: Discussionmentioning

confidence: 94%

Climatic and human effects on the post-glacial dynamics of Fagus sylvatica L. in NW Iberia

et al. 2008

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“…In addition, the chronological control of MRV‐2 was independently determined (and improved in the case of the more recent periods) by applying the same combination of pollen markers and historical information (Table ) used previously by Muñoz Sobrino et al . (, , ) in this area. This pollen chronology is based on the modern afforestation with pines and Eucalyptus (cf.…”

Section: Methodsmentioning

confidence: 85%

“…B): cores MRV‐3, MRV‐4, ZV‐01 and Vir‐94, all obtained from the Rande Strait, and cores B‐1 and CORE‐8, obtained inside San Simón Bay (see Muñoz Sobrino et al . , , ; Martínez‐Carreño & García‐Gil ).…”

Section: Methodsmentioning

confidence: 98%

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Reconstruction of the environmental history of a coastal insular system using shallow marine records: the last three millennia of the Cíes Islands (Ría de Vigo,NWIberia)

Sobrino

García-Moreiras

Martínez-Carreño

et al. 2016

Boreas

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The coastal lagoon‐beach complex at the Cíes Islands located at the opening of the Ría de Vigo (NW Iberia) is an important ecosystem currently threatened by anthropogenic impacts and climate variations. We used multiproxy marine sediment analyses to reconstruct the millennial environmental dynamics of this insular system and, in particular, the recent history of its coastal lagoon. Geophysical surveys were used to obtain bathymetry and identify the major sedimentary units of its closest submarine basin as well as their sediment sources. Core samples were taken in the middle and distal parts of the sedimentary body, where several prograding sedimentary units are thinner, allowing continuous sampling of the facies. Lithological, textural, elemental and chronological analyses were carried out on two cores. The detailed palynological studies on one of the cores included the analyses of the pollen, non‐pollen palynomorphs and dinocysts dating back three millennia. Our results revealed noticeable environmental changes affecting this area during the last 3000 years, due mainly to changing climate and oceanic conditions but also to the impact of historic human occupation of the islands. Several cold events (the 2.8 ka BP event and the Little Ice Age) characterized by enhanced upwelling alternated with warmer stormy periods of prevailing downwelling conditions in the ria. These circumstances altered the balance amongst the lacustrine, marsh, dune and lagoon systems, opening ephemeral inlets and modifying the trophic stage of the shallow waters surrounding the archipelago. Here we provide a background of the human and climatic impacts affecting these highly sensitive habitats, which may serve to improve their future management strategies.

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“…Lemos & Pires (2004) Finally, at longer time scales, the intensification of upwelling in the Galician-Portuguese margin during approximately the last 1000 yr has been well described (Diz et al 2002, Soares & Dias 2006, Martins et al 2006, Muñoz-Sobrino et al 2007). Bernárdez et al (2008) observed that the biosiliceous and geochemical signatures of sediments from the last 500 yr indicate enhanced up welling and increased phytoplanktonic production as sociated with the intensification of northerly winds.…”

Section: Introductionmentioning

confidence: 99%

Upwelling along the western coast of the Iberian Peninsula: dependence of trends on fitting strategy

Santos¹,

Gómez‐Gesteira²,

deCastro³

et al. 2011

Clim. Res.

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We investigated upwelling variability along the western coast of the Iberian Peninsula for the period 1948−2009 by means of wind data extracted from the NCEP/NCAR reanalysis project. According to most previous studies, a remarkable weakening in upwelling intensity has been observed in the area. However, the observed linear trends are highly dependent on the length of the series. Here we show how the upwelling index signal can be fitted to different functions with diametrically opposed results. Both a simple linear regression and the fit to an equation including a linear term and a sinusoid with periodicity of 10.9 yr show weakening of upwelling intensity. In contrast, the fit to a more complex function including a linear term and a double sinusoid with short and long periodicities of T s = 10.9 and T l = 89 yr show strengthening of upwelling intensity. Both periodicities can be related to the Schwabe and Gleissberg cycles of solar activity. Although this last function showed a greater significance than the others, some uncertainty remains in the actual duration of the long period due to the short length of the upwelling index signal.

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Palynological characterization of gassy sediments in the inner part of Ría de Vigo (NW Spain). New chronological and environmental data

Cited by 21 publications

References 21 publications

Climatic and human effects on the post-glacial dynamics of Fagus sylvatica L. in NW Iberia

Climatic and human effects on the post-glacial dynamics of Fagus sylvatica L. in NW Iberia

Reconstruction of the environmental history of a coastal insular system using shallow marine records: the last three millennia of the Cíes Islands (Ría de Vigo,NWIberia)

Upwelling along the western coast of the Iberian Peninsula: dependence of trends on fitting strategy

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