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The climate of the Common Era off the Iberian Peninsula ArchiMer
Abrantes, Fatima; Rodrigues, Teresa; Rufino, Marta; Salgueiro, Emilia; Oliveira, Dulce; Gomes, Sandra; Oliveira, Paulo; Costa, Ana; Mil-homens, Mario; Drago, Teresa; Naughton, Filipa.
The Mediterranean region is a climate hot spot, sensitive not only to global warming but also to water availability. In this work we document major temperature and precipitation changes in the Iberian Peninsula and margin during the last 2000 years and propose an interplay of the North Atlantic internal variability with the three atmospheric circulation modes (ACMs), (North Atlantic Oscillation (NAO), east atlantic (EA) and Scandinavia (SCAND)) to explain the detected climate variability. We present reconstructions of sea surface temperature (SST derived from alkenones) and on-land precipitation (estimated from higher plant n-alkanes and pollen data) in sedimentary sequences recovered along the Iberian Margin between the south of Portugal (Algarve) and the...
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Ano: 2017 URL: https://archimer.ifremer.fr/doc/00417/52833/53750.pdf
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Diatoms as a paleoproductivity proxy in the NW Iberian coastal upwelling system (NE Atlantic) ArchiMer
Zuniga, Diana; Santos, Celia; Frojan, Maria; Salgueiro, Emilia; Rufino, Marta; De La Granda, Francisco; Figueiras, Francisco G.; Castro, Carmen G.; Abrantes, Fatima.
The objective of the current work is to improve our understanding of how water column diatom's abundance and assemblage composition is seasonally transferred from the photic zone to seafloor sediments. To address this, we used a dataset derived from water column, sediment trap and surface sediment samples recovered in the NW Iberian coastal upwelling system. Diatom fluxes (2.2 (+/- 5.6) 10(6) valves m(-2) d(-1)) represented the majority of the siliceous microorganisms sinking out from the photic zone during all studied years and showed seasonal variability. Contrasting results between water column and sediment trap diatom abundances were found during downwelling periods, as shown by the unexpectedly high diatom export signals when diatom- derived primary...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00381/49257/49684.pdf
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