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Seasonality of Intermediate Waters Hydrography West of the Iberian Peninsula from a 8-yr Semiannual Timeseries of an Oceanographic Section : Volume 9, Issue 6 (01/11/2012)

By Prieto, E.

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Book Id: WPLBN0003981972
Format Type: PDF Article :
File Size: Pages 38
Reproduction Date: 2015

Title: Seasonality of Intermediate Waters Hydrography West of the Iberian Peninsula from a 8-yr Semiannual Timeseries of an Oceanographic Section : Volume 9, Issue 6 (01/11/2012)  
Author: Prieto, E.
Volume: Vol. 9, Issue 6
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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González-Pola, C., Lavín, A., Sánchez, R. F., Prieto, E., & Ruiz-Villarreal, M. (2012). Seasonality of Intermediate Waters Hydrography West of the Iberian Peninsula from a 8-yr Semiannual Timeseries of an Oceanographic Section : Volume 9, Issue 6 (01/11/2012). Retrieved from

Description: Spanish Institute of Oceanography, Oceanographic Centre of Gijón, Gijón, Spain. Seasonality of hydrographical properties at depth in the western Iberian margin (Eastern North Atlantic) is analysed from a 2003–2010 timeseries of a semi-annual oceanographic section extending ~ 200 nm off Cape Finisterre (43° N). All waters masses down to the whole extent of the permanent thermocline (2000 dbar) show a consistent seasonal signature in their termohaline 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 East North Atlantic Central Waters in summertime, which is larger and deeper-reaching on the slope. In summertime, Mediterranean Water 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 developing 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 helps to 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.

Seasonality of intermediate waters hydrography west of the Iberian Peninsula from a 8-yr semiannual timeseries of an oceanographic section

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