García-García, L. (Luz)

Ruiz-Villarreal, M. (Manuel)

English

Repositorio Institucional Digital del IEO

Variability of primary production during the spring bloom in NW Iberia: what can we learn from a biophysical model?The IEO observing and modelling systemThe Spanish Institute of Oceanography (Instituto Español de Oceanografía, IEO) has been performing sustained observations of physical (temperature, salinity and currents) and biochemical variables (nutrients, oxygen and plankton) along the N and NW Atlantic Iberian coast since the late 80s.L.M. García-García, M. Ruiz-Villarreal & M. Bernal (2016)  A biophysical model for simulating early life stages of sardine in the Iberian Atlantic stock. Fisheries Research, 173 (3),250–272.Seasonal and interannual variability (model vs Modis) 2006 2007Spring bloomSpring bloomAutumn bloomAutumn bloomUpwelling UpwellingThe monthly vertical profiles (dots) of temperature, nitrate and chlorophyll provide information on the water column stratification and mixing, the onset and decline of blooms or the ocurrence of upwelling events bringing nutrients to the  surface and enhancing production. The model (background) matches well the observations and complete the information at scales not captured by the monitoring system.In 2006 low chlorophyll at the beginning of the cruise in GaliciaIn 2007 high chlorophyll at the beginning of the cruise in GaliciaIn 2006 high zooplankton at the beginning of the cruise in GaliciaIn 2007 low zooplankton at the beginning of the cruise in GaliciaIn 2006 no nutrient samplingIn 2007 high nitrate at the beginning of the cruise. Upwelling2006 2007Spring Pelacus cruises 2006 and 2007TemperatureNitrateChlorophyllMixed Layer Depth ChlorophyllNitrateZooplanktonMixed Layer Depth ChlorophyllNitrateZooplanktonHovmueller plots of this sectionIn NW Iberia blooms result from the Interplay of upwelling, as the main source of nutrients, and river plumes, where production can occur even in winter.In 2006 the cruise started under downwelling conditions. Strong river discharge provided nutrients      that sustained production at the plume      . Concentration of zooplankton was at its maximum associated with the plume     .In 2007 the cruise started under upwelling conditions, causing the uplift of nutrients      and sutaining production (high chlorophyll      ). Zooplankton was low during the cruise      , but bloomed later.Sampling takes place here11222333The model shows that...644455566Short term variabilityThe model reproduces the seasonal and interannual variability.The model overestimates the spring bloom.The timing and intensity of the bloom depends on the meteo forcing.L.M García-García and M. Ruiz-Villarrealluz.garcia@ieo.es, manuel.ruiz@ieo.esThe IEO Pelacus survey monitors every spring the continental shelf for the acoustic determination of biomass of pelagic fish stocks. Hydrographic and biogeochemical variables are also sampled. We focus here on 2006 and 2007 

Variability of primary production during the spring bloom in NW Iberia: what can we learn from a biophysical model?

García-García, Luz

Ruiz-Villarreal, Manuel

Digital.CSIC

http://www.repositorio.ieo.es/e-ieo/bitstream/10508/12071/1/Poster_AMEMR.compressed.pdf

Variability of primary production during the spring bloom in NW Iberia: what can we learn from a biophysical model?

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