Characterization of Iberian turbid plumes by means of synoptic patterns obtained through MODIS imagery

Fernández-Nóvoa, Diego; deCastro, M.; Des, M.; Costoya, X.; Mendes, Renato

doi:10.1016/j.seares.2017.06.013

Cited by 24 publications

(23 citation statements)

References 64 publications

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“…The former would require a strong seasonal signal of oceanic arrivals into the Gulf of Cadiz and the Strait of Gibraltar resulting from the seasonality of spawning in the Sargasso Sea (Miller et al., ), attenuated, but not eliminated, by oceanic drift; the latter would require a seasonally‐varying trigger of environmental origin in the Iberian margin (Arribas et al., ; Miller, ). Given that the IPC is weakest during summer months, when it is also bounded below the thermocline and river plumes off western and southern Iberia are minimal (Fernández‐Novoa et al., ), and that an oceanic drift of more than a year can eliminate any seasonal pattern in arrivals to Europe (Blanke et al., ), the latter alternative seems more plausible.…”

Section: Discussionmentioning

confidence: 99%

“…The mixed layer depth increases from November to February/March. In February maximum values are attained (>80 m) and the offshore extension of turbid waters of river origin (Fernández‐Novoa et al., ) is maximal, reaching the outer shelf (Figure d). Ekman transport is minimal from October to January, when recurrent southerly wind episodes may force convergence of the surface waters onshore and, especially during the late months of the year, turbid waters from early rains are confined to the region near the coast.…”

Section: Methodsmentioning

confidence: 96%

“…Satellite, meteo‐oceanographic data from observation analyses and numerical model solutions were used to describe the main circulation features in the Iberian margin and shelf, compute monthly climatologies off river Lis and obtain environmental observations for dates with glass eel experimental fishing. Fully normalised remote sensing reflectance at 645 nm data from MODIS (MODerate resolution Imaging Spectrometer) were used as proxy of turbid plumes of riverine origin (Fernández‐Novoa et al., ); multi‐year (2003–2016) monthly averages were computed for the Iberian area from the “GlobColour 8‐day MODIS product” available at 4 km resolution (Maritorena, Fanton d'Andon, Mangin, & Siegel, ).…”

Section: Methodsmentioning

confidence: 99%

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Glass eel (Anguilla anguilla) recruitment to the river Lis: Ingress dynamics in relation to oceanographic processes in the western Iberian margin and shelf

Stratoudakis

Oliveira

Teles‐Machado

et al. 2018

Fisheries Oceanography

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To provide new information on the ingress dynamics of glass eels at the Portuguese coast, the study analyzes catch per unit effort (CPUE) data from river Lis, biometric data from recruits in basins of western Portugal and meteo‐oceanographic data from the Iberian margin and shelf. Biometric data of glass eels in western Portugal are congruent with the latitudinal size gradient of leptocephali in oceanic surveys and show clear seasonality, with longest and heaviest individuals arriving from October to December. Generalized additive models fitted to CPUEs from two experimental fishing periods (1996–1997 and 2013–2014) show that availability of glass eels to the sampling gear was inversely related to lunar phase and sea wave height. CPUE was lowest from May to September, increased towards the end of the year and peaked in February–March, when recruits were almost 40% lighter than autumn arrivals. Commercial CPUE during the 1989–1990 fishing season was significantly higher than experimental fishing data in 1996–1997. Higher variance and smaller sample size in 2013–2014 prevent conclusive interdecadal comparisons. Finally, CPUE was significantly higher during the prevalence of northward current flow off western Portugal and during strong cross‐shelf westerly winds. Findings support the suggestion that eel recruitment in Portugal occurs mainly by leptocephali travelling along the Azores Current, deflected northwards through the Iberian Poleward Current, with river ingress, and possibly oceanic metamorphosis, modulated by seasonal dynamics in coastal hydrology and shelf/upper margin oceanography.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

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Glass eel (Anguilla anguilla) recruitment to the river Lis: Ingress dynamics in relation to oceanographic processes in the western Iberian margin and shelf

Stratoudakis

Oliveira

Teles‐Machado

et al. 2018

Fisheries Oceanography

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“…The average annual precipitation ranges from 144 to 1300 mm yr −1 . Miño River presents an annual hydrologic cycle characterised by a pluvial regime, with maximum river discharges during winter months, then descending to reach its minimum values during summer (Fernández-Nóvoa et al, 2017). Specifically, considering the period under study at Lugo station, Miño River reaches maximum flows of 114 and 128 m 3 s −1 in January and February and minimum flows of 7 and 8 m 3 s −1 in August and September, respectively.…”

Section: Study Areamentioning

confidence: 97%

Towards an automatic early warning system of flood hazards based on precipitation forecast: the case of the Miño River (NW Spain)

González-Cao

García-Feal

Fernández-Nóvoa

et al. 2019

Nat. Hazards Earth Syst. Sci.

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Abstract. An early warning system for flood prediction based on precipitation forecast is presented. The system uses rainfall forecast provided by MeteoGalicia in combination with a hydrologic (Hydrologic Modeling System, HEC-HMS) and a hydraulic (Iber+) model. The upper reach of the Miño River and the city of Lugo (NW Spain) are used as a study area. Starting from rainfall forecast, HEC-HMS calculates the streamflow and Iber+ is automatically executed for some previously defined risk areas when a certain threshold is exceeded. The analysis based on historical extreme events shows that the system can provide accurate results in less than 1 h for a forecast horizon of 3 d and report an alert situation to decision makers.

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“…Several rivers drain to the Ria de Aveiro -an estuary with coastal lagoon characteristics -with a total catchment area of ∼3600 m 2 , Vouga being the largest river, with an average runoff of 29 m 3 s −1 (Dias et al, 1999;Da Silva and Oliveira, 2007). Moreover, during periods of upwelling favorable winds, the study area may also be influenced by the Douro river plume, whose outlet is situated ∼35 km north of the study site (Fernández-Nóvoa et al, 2017). The Douro river has a larger catchment basin (98 073 km 2 ) and a mean discharge of 700 m 3 s −1 , with a significant sediment load to the NW Iberian shelf (Dias et al, 2002;Oliveira et al, 2002;Fernández-Nóvoa et al, 2017).…”

Section: Study Areamentioning

confidence: 99%

Environmental Factors Affecting Spatial Dinoflagellate Cyst Distribution in Surface Sediments Off Aveiro-Figueira da Foz (Atlantic Iberian Margin)

et al. 2021

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Resting cysts of planktonic dinoflagellates, once produced, sink to the seabed where they can remain viable for a long time. These cysts have important ecological roles, such as acting as the inoculum for the development of planktonic populations. Moreover, dinoflagellate cyst records from depth sediment cores are broadly used as a proxy to infer past environmental conditions. In this study, the main objective was to obtain information on the relationships between the spatial distribution of modern dinoflagellate cysts and present-day hydrography in the NW Iberian shelf. Cyst assemblages were analyzed in 51 surface sediment samples with varying grain sizes, collected at different water depths, following nine transects perpendicular to the coast, between Aveiro and Figueira da Foz (Atlantic Iberian margin). Multivariate statistical analyses revealed marked land-sea and latitudinal gradients in the distribution of cysts, and helped investigate how environmental factors [water depth, grain size, sea-surface temperature (SST), sea-surface salinity (SSS), bottom temperature (BTT) and surface chlorophyll-a concentration (CHL)] influence modern dinoflagellate cyst composition and abundances. Three main ecological signals were identified in the modern dinoflagellate cyst assemblages: (1) the heterotroph signal as the main upwelling signal; (2) the dominance of P. reticulatum and L. polyedra signal, indicative of warm stratified conditions, possibly reflecting transitional environments between more active inshore upwelling and warmer offshore waters; and (3) the G. catenatum signal for the presence of mid-shelf upwelling fronts. The almost absence of viable cysts of the toxic and potentially toxic species G. catenatum L. polyedra and P. reticulatum suggests that in the study area, for these species, there is no build-up of significant cyst beds and thus planktonic populations must depend on other seeding processes. These results are the first detailed modern distribution of dinoflagellate cysts in the NW Iberian Atlantic margin (off Portugal), and show a good correspondence with hydrographic features of summer upwelling season in the study area, meaning that they are reflecting water column characteristics and therefore may be used as supporting evidence for the interpretation of stratigraphic cyst records and reconstruction of past marine ecosystems in W Iberia.

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Characterization of Iberian turbid plumes by means of synoptic patterns obtained through MODIS imagery

Cited by 24 publications

References 64 publications

Glass eel (Anguilla anguilla) recruitment to the river Lis: Ingress dynamics in relation to oceanographic processes in the western Iberian margin and shelf

Glass eel (Anguilla anguilla) recruitment to the river Lis: Ingress dynamics in relation to oceanographic processes in the western Iberian margin and shelf

Towards an automatic early warning system of flood hazards based on precipitation forecast: the case of the Miño River (NW Spain)

Environmental Factors Affecting Spatial Dinoflagellate Cyst Distribution in Surface Sediments Off Aveiro-Figueira da Foz (Atlantic Iberian Margin)

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