Winter upper ocean circulation in the Western Iberian Basin—Fronts, Eddies and Poleward Flows: an overview

Peliz, Álvaro; Dubert, Jesús; Santos, A. Miguel P.; Oliveira, Paulo B.; Cann, Bernard Le

doi:10.1016/j.dsr.2004.11.005

Cited by 257 publications

(275 citation statements)

References 43 publications

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“…This upwelling/downwelling regime interacts with the slope dynamics characterized by the presence of the Iberian Poleward Current (IPC), a poleward flow driven by the meridional density gradient that carries warmer and saltier waters of southern origin (Haynes and Barton, 1990;Frouin et al, 1990;Pingree and Le Cann, 1990). The IPC is thought be a permanent feature although it reaches a maximum development in wintertime after the strengthening of the meridional density gradients in late fall and winter (Peliz et al, 2005), aided by downwelling favourable winds, which adds up to a fifth of the total transport (Frouin et al, 1990). On the contrary, during the summer the IPC is not observed at the sea surface and it is thought to be displaced offshore and to persist below the surface (Peliz et al, 2005;Ruiz-Villarreal et al, 2006).…”

Section: Continental Slope Dynamics: Upwelling the Iberian Poleward mentioning

confidence: 98%

“…The continental slope is characterized by the development of a density driven countercurrent (poleward) known as the Iberian Poleward Current, IPC (e.g. Frouin et al, 1990;Peliz et al, 2005). A detailed review of the modal, intermediate and deep water masses of the midlatitude north-east Atlantic Ocean was performed by van Aken (2000avan Aken ( ,b, 2001) and sketches of the pathways of such waters masses from their source region towards western Iberia are shown in Fig.…”

Section: Water Masses and Circulation West Of The Iberian Peninsulamentioning

confidence: 99%

“…The IPC is thought be a permanent feature although it reaches a maximum development in wintertime after the strengthening of the meridional density gradients in late fall and winter (Peliz et al, 2005), aided by downwelling favourable winds, which adds up to a fifth of the total transport (Frouin et al, 1990). On the contrary, during the summer the IPC is not observed at the sea surface and it is thought to be displaced offshore and to persist below the surface (Peliz et al, 2005;Ruiz-Villarreal et al, 2006). The effect of the upwelling/downwelling cycle on the central waters is reflected in our dataset as enhanced cooling/freshening on the slope in summertime, down to 600 dbar, caused by heave (Fig.…”

Section: Continental Slope Dynamics: Upwelling the Iberian Poleward mentioning

confidence: 99%

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Seasonality of intermediate waters hydrography west of the Iberian Peninsula from an 8 yr semiannual time series of an oceanographic section

Prieto

González‐Pola

Lavín³

et al. 2013

Ocean Sci.

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Abstract. Seasonality of hydrographical properties at depth in the western Iberian margin (eastern North Atlantic) is analysed from a 2003-2010 time series of a semiannual oceanographic section extending ∼ 200 nm off Cape Finisterre (43 • N). All water masses down to the permanent thermocline (2000 dbar) show a consistent seasonal signature in their thermohaline properties and there is a notable asymmetry between the slope region and the outer ocean (in the surroundings of the Galicia Bank). There is overall cooling and freshening of eastern North Atlantic central waters in summertime, which is larger and deeper-reaching on the slope. In summertime, Mediterranean Water (MW) gets tightly attached against the slope and is uplifted, reinforcing its thermohaline signature and diminishing its presence at the outer ocean. In wintertime the situation reverses, MW seems to detach from the slope and spreads out to the open ocean, even being observed a secondary branch around the Galicia Bank. Thermohaline seasonality at depth shows values up to 0.4 • C and 0.08 in salinity at the lower MW, of the order of 20 % of the overall interannual variability observed during the whole period. Decomposition of thermohaline changes at isobaric levels to changes along isoneutral surfaces and changes due to vertical displacements help analyse the physical processes behind the observed seasonality in terms of (1) the large-scale seasonality of the subtropical gyre in response to the seasonal migration of the subtropical high pressure system and subsequent anomalies in Ekman transport and wind stress curl, (2) the continental slope dynamics, characterized by summer upwelling, winter development of the Iberian Poleward Current and Mediterranean water spreading, and (3) the possible influence of seasonal changes of water mass properties at their formation sources.

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Section: Continental Slope Dynamics: Upwelling the Iberian Poleward mentioning

confidence: 98%

Section: Water Masses and Circulation West Of The Iberian Peninsulamentioning

confidence: 99%

Section: Continental Slope Dynamics: Upwelling the Iberian Poleward mentioning

confidence: 99%

See 1 more Smart Citation

Seasonality of intermediate waters hydrography west of the Iberian Peninsula from an 8 yr semiannual time series of an oceanographic section

Prieto

González‐Pola

Lavín³

et al. 2013

Ocean Sci.

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“…The western coast of the Iberian Peninsula is characterized by the occurrence of contrasting oceanographic conditions between a quasi-permanent coastal upwelling regime and a surface equatorward current in summer (April to October) (Fiuza, 1982(Fiuza, , 1983Peliz, 2002), and a poleward alongshore warm counter current in winter (Fiuza and Frouin, 1986;Peliz et al, 2005).…”

Section: Oceanographic Conditions 35mentioning

confidence: 99%

“…It consists of an upper slope/shelf break poleward flow that is a branch of the Azores current, transports saltier and warmer (subtropical) waters (Peliz et al, 2005) and depends most on the intensity of the southerly winds (Teles-20 Machado et al, 2015). Another important feature of the winter circulation over the western margin is the formation of coastal buoyant plumes, characterized by low salinities and temperature lower than the ambient shelf waters (Peliz et al, 2005). Such plumes result from the discharge of freshwater from rivers, which in turn reflects continental precipitation.…”

Section: Oceanographic Conditions 35mentioning

confidence: 99%

Historical Climate off the Atlantic Iberian Peninsula

Abrantes

Rodrigues

Rufino

et al. 2017

Preprint

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Abstract. The Iberian Peninsula, at North Atlantic mid-latitude and the western extreme of the European continent, is a key point for climate reconstructions. This work provides multi-proxy records measured in 8 inner-shelf sediment cores from 5 sites located between South Portugal (Algarve) and Northwest Spain (Galiza) (36 to 41 ºN) and target a regional reconstruction of climate variability during 20 the Historic period (last 2 ky).The SST records reveal a long-term scale cooling (± 1º C/ 2 ky) that ends at the beginning of the 20 th century at all latitudes. This cooling is a follow up of the cooling process that started in the early Holocene driven by a decrease in summer insolation in the Northern Hemisphere.Within this long term SST variability multi-decadal/ centennial scale variability is detected along Iberia. 25The different latitudinal SST reconstructions jointly with a determined regional SST stack were compared to on-land precipitation from higher plant n-alkanes and pollen data, to assess the relationship between hydroclimate (drought and/or precipitation) and SST. Regional variability is overall in consonance with NE Spain, and other European and north Hemisphere reconstructions. Warm Clim. Past Discuss.,

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Coccolithophores as proxy of seawater changes at orbital-to-millennial scale during middle Pleistocene Marine Isotope Stages 14-9 in North Atlantic core MD01-2446

et al. 2014

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Quantitative coccolithophore analyses were performed in core MD01-2446, located in the midlatitude North Atlantic, to reconstruct climatically induced sea surface water conditions throughout Marine Isotope Stages (MIS) 14-9. The data are compared to new and available paleoenvironmental proxies from the same site as well as other nearby North Atlantic records that support the coccolithophore signature at glacial-interglacial to millennial climate scale. Total coccolithophore absolute abundance increases during interglacials but abruptly drops during the colder glacial phases and deglaciations. Coccolithophore warm water taxa (wwt) indicate that MIS11c and MIS9e experienced warmer and more stable conditions throughout the whole photic zone compared to MIS13. MIS11 was a long-lasting warmer and stable interglacial characterized by a climate optimum during MIS11c when a more prominent influence of the subtropical front at the site is inferred. The wwt pattern also suggests distinct interstadial and stadial events lasting about 4-10 kyr. The glacial increases of Gephyrocapsa margereli-G. muellerae 3-4 μm along with higher values of C org , additionally supported by the total alkenone abundance at Site U1313, indicate more productive surface waters, likely reflecting the migration of the polar front into the midlatitude North Atlantic. Distinctive peaks of G. margereli-muellerae (>4 μm), C. pelagicus pelagicus, Neogloboquadrina pachyderma left coiling, and reworked nannofossils, combined with minima in total nannofossil accumulation rate, are tracers of Heinrich-type events during MIS12 and MIS10. Additional Heinrich-type events are suggested during MIS12 and MIS14 based on biotic proxies, and we discuss possible iceberg sources at these times. Our results improve the understanding of mid-Brunhes paleoclimate and the impact on phytoplankton diversity in the midlatitude North Atlantic region.

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Winter upper ocean circulation in the Western Iberian Basin—Fronts, Eddies and Poleward Flows: an overview

Cited by 257 publications

References 43 publications

Seasonality of intermediate waters hydrography west of the Iberian Peninsula from an 8 yr semiannual time series of an oceanographic section

Seasonality of intermediate waters hydrography west of the Iberian Peninsula from an 8 yr semiannual time series of an oceanographic section

Historical Climate off the Atlantic Iberian Peninsula

Coccolithophores as proxy of seawater changes at orbital-to-millennial scale during middle Pleistocene Marine Isotope Stages 14-9 in North Atlantic core MD01-2446

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