Submesoscale processes in the coastal margins of the Strait of Gibraltar. The Trafalgar – Alboran connection

Bolado-Penagos, Marina; González, Carlos J.; Chioua, Jamal; Sala, Iria; Gomiz-Pascual, Juan Jesús; Vázquez, Águeda; Bruno, Miguel

doi:10.1016/j.pocean.2019.102219

Cited by 16 publications

(10 citation statements)

References 49 publications

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“…Under easterlies the quasi-permanent upwelling located in the NW Alboran Sea is displaced offshore and the oligotrophic center of the WAG can be even fertilized. Another important particularity is the action of easterlies disrupting the transport of Chl-a from the coastal margin of the Strait toward the Alboran Sea (Bolado-Penagos et al, 2020). Recently, Gómez-Jakobsen et al ( 2019) have described the summer upwelling in the mouth of the Bay of Algeciras.…”

Section: Biological Implications Of Easterly Wind Forcing In the Western Alboran Seamentioning

confidence: 99%

Revising the Effects of Local and Remote Atmospheric Forcing on the Atlantic Jet and Western Alboran Gyre Dynamics

et al. 2021

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Atlantic and Mediterranean waters encounter in the Strait of Gibraltar (Figure 1), where the fresher and lighter Atlantic Water (AW) flows onto the saltier and denser Mediterranean Water (MW) (Lacombe & Richez, 1982). Both water masses create the Atlantic Mediterranean Interface (AMI) with a thickness of 60-100 m, which deepens on the western side (400 m) and is shallower (100 m) on the eastern side (Bray et al., 1995). At the easternmost side of the Strait, AMI has been related with the isohaline 37.2 (García-Lafuente et al., 2013), and its position helps describe the biological processes taking place across the Strait

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Section: Biological Implications Of Easterly Wind Forcing In the Western Alboran Seamentioning

confidence: 99%

Revising the Effects of Local and Remote Atmospheric Forcing on the Atlantic Jet and Western Alboran Gyre Dynamics

et al. 2021

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“…This is a productive zone due to an upwelling process and constant nutrient supply due to tidal mixing (Vargas-Yáñez et al, 2002) and also favoured by high residence times of the water masses ca. three days (Vázquez-Escobar et al, 2009;Bolado-Penagos et al, 2020).…”

Section: Spatial Variabilitymentioning

confidence: 99%

“…Nonetheless, the highly variable and intense hydrodynamics over all of the SG drives the short residence time of the waters and does not allow observing the succession after intense mixing of biological communities. There is an exception in some locations such as the CT area that is characterized by a residence time of several days (Bolado-Penagos et al, 2020) ) and coastal communities properly coupled with the supply of nutrients.…”

Section: Fortnightly Variabilitymentioning

confidence: 99%

Variability of early autumn planktonic assemblages in the strait of Gibraltar: a regionalization analysis

VALCÁRCEL-PÉREZ¹,

GARCÍA²,

González-Gordillo³

et al. 2022

Medit. Mar. Sci.

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The Strait of Gibraltar (SG) is the only connection of the Mediterranean Sea with the global circulation. The SG is an outstanding marine region to explore physical-biological coupling of pelagic communities due to its hydrodynamic complexity, including strong tidal forcing and marked spatial gradients and fronts. The authors have unravelled the role of the fortnightly tidal scale (spring and neap tides) and local processes (upwelling and tidal-topographic mixing) that shape planktonic assemblages in the Strait. To do so, an oceanographic cruise was taken in early autumn 2008 with a high-resolution grid sampling and spring/neap tidal conditions. The planktonic features were captured using different automatic and semi-automatic techniques of plankton analyses (flow cytometry, FlowCAM, LOPC and Ecotaxa) that allowed covering a wide range of sizes of the community from pico- to mesoplankton. The SG was sectorized into two clusters based on the biogeochemical and main water column properties. Cluster 1 (CL1) covered shallow productive areas around Cape Trafalgar (CT). CL1 presented higher concentrations of chlorophyll and nutrients, and phytoplankton was mostly represented by Synechococcus and coastal diatoms while zooplankton had the highest percentage of meroplankton (31%). In contrast, cluster 2 (CL2) covered open ocean waters and presented more oligotrophic features, i.e. nitrogen-depleted waters with lower chlorophyll concentrations and a picoplankton community dominated by Prochlorococcus and holoplankton predominance in mesozooplankton. Under early autumn conditions with overall nutrient-depleted and stratified waters, the CT area emerges as an ecosystem where the constant tidal mixing and nutrients supply is coupled with an active production also being favored by high residence times and finally shaping a plankton community with unique features in the area.

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“…The spatial variability of the CO 2 system during summer is also influenced by mixing processes driven by local climatology factors, as the wind-induced upwelling in the Gulf of Cádiz, the Strait of Gibraltar and the Alboran Sea at local (e.g., Peliz et al, 2009;Gómez-Jakobsen et al, 2019;Bolado-Penagos et al, 2020) and regional scale (e.g., Richez and Kergomard, 1990;Folkard et al, 1997;Stanichny et al, 2005). The signal of the wind-induced upwelling during the warm months was observed in minimum values of SST around CS and between TN and GC (Figure 2).…”

Section: High-resolution Study Of the Spatio-temporal Variability Of The Co 2 Systemmentioning

confidence: 99%

Air-Sea CO2 Exchange in the Strait of Gibraltar

et al. 2021

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The seasonal and spatial variability of the CO2 system and air-sea fluxes were studied in surface waters of the Strait of Gibraltar between February 2019 and March 2021. High-resolution data was collected by a surface ocean observation platform aboard a volunteer observing ship. The CO2 system was strongly influenced by temperature and salinity fluctuations forced by the seasonal and spatial variability in the depth of the Atlantic–Mediterranean Interface layer and by the tidal and wind-induced upwelling. The changes in seawater CO2 fugacity (fCO2,sw) and fluxes were mainly driven by temperature despite the significant influence of non-thermal processes in the southernmost part. The thermal to non-thermal effect ratio (T/B) reached maximum values in the northern section (>1.8) and minimum values in the southern section (<1.30). The fCO2,sw increased with temperature by 9.02 ± 1.99 μatm °C–1 (r2 = 0.86 and ρ = 0.93) and 4.51 ± 1.66 μatm °C–1 (r2 = 0.48 and ρ = 0.69) in the northern and southern sections, respectively. The annual cycle of total inorganic carbon normalized to a constant salinity of 36.7 (NCT) was assessed. Net community production processes described 93.5–95.6% of the total NCT change, while air-sea exchange and horizontal and vertical advection accounted for <4.6%. The fCO2,sw in the Strait of Gibraltar since 1999 has been fitted to an equation with an interannual trend of 2.35 ± 0.06 μatm year–1 and a standard error of estimate of ±12.8 μatm. The seasonality of the air-sea CO2 fluxes reported the behavior as a strong CO2 sink during the cold months and as a weak CO2 source during the warm months. Both the northern and the southern sections acted as a net CO2 sink of −0.82 and −1.01 mol C m–2 year–1, respectively. The calculated average CO2 flux for the entire area was −7.12 Gg CO2 year–1 (−1.94 Gg C year–1).

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Submesoscale processes in the coastal margins of the Strait of Gibraltar. The Trafalgar – Alboran connection

Cited by 16 publications

References 49 publications

Revising the Effects of Local and Remote Atmospheric Forcing on the Atlantic Jet and Western Alboran Gyre Dynamics

Revising the Effects of Local and Remote Atmospheric Forcing on the Atlantic Jet and Western Alboran Gyre Dynamics

Variability of early autumn planktonic assemblages in the strait of Gibraltar: a regionalization analysis

Air-Sea CO2 Exchange in the Strait of Gibraltar

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