Wind driven upwelling along the African coast of the Strait of Gibraltar

Stanichny, S. V.; Tigny, Vincent; Stanichnaya, R. R.; Djenidi, Salim

doi:10.1029/2004gl021760

Cited by 19 publications

(25 citation statements)

References 9 publications

(11 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The idea of wind-induced coastal upwelling (in the cross-strait direction) versus tidally induced upwelling (in the along-strait direction) has also been reported. In a recent observational study, Stanichny et al (2005) based on high spatiotemporal resolution satellite data showed that wind-driven upwelling phenomena are frequent along the African coast of the Strait of Gibraltar presenting a fast growing 3-D dynamical structure that strongly affects vertical and horizontal water motions and redistribution of biochemical components in the area.…”

Section: Gibraltar Straitmentioning

confidence: 99%

Modelling the Gibraltar Strait/Western Alboran Sea ecohydrodynamics

Skliris

Beckers

2009

Ocean Dynamics

View full text Add to dashboard Cite

The ecohydrodynamics of the Gibraltar Strait and the Western Alboran Sea is investigated using a 3-D, twoway nested, coupled hydrodynamic/plankton ecosystem model, exploiting the MEDATLAS climatological database. A high-resolution model (~1 km) of the Gibraltar/Western Alboran region embedded within a coarse-resolution model of the West Mediterranean (~5 km) is implemented. The model seasonal climatology of the 3-D circulation and the flow characteristics at the Gibraltar Strait and the Alboran Sea are discussed, and their impact on the plankton ecosystem evolution is explored. An important ecohydrodynamic feature produced by the model is a permanent upwelling zone in the northwestern part of the Alboran Sea in agreement with observations. Model results show that both horizontal and vertical current intensity of the Atlantic Jet increases progressively at the strait to obtain maximum values in the northeastern Mediterranean entrance, inducing an upward displacement of the nitracline. The nutrient-rich water transport through the strait along with the generation of cyclonic vorticity in the northwestern Alboran Sea result in the accumulation of nutrients there and thus induce a permanent fertilisation of this area.

show abstract

Section: Gibraltar Straitmentioning

confidence: 99%

Modelling the Gibraltar Strait/Western Alboran Sea ecohydrodynamics

Skliris

Beckers

2009

Ocean Dynamics

View full text Add to dashboard Cite

show abstract

“…U-wind and chl-a in Zone 2 showed a quite synchronised co-variation (Figure 9b,d). The influence of easterlies in our ROI was greater than the influence of westerlies [11,64]. East winds enhance the upwelling of nutrient-rich waters, being more noticeable in Zone 2 together with tidal-bathymetry interaction.…”

Section: Discussionmentioning

confidence: 62%

High-Chlorophyll-Area Assessment Based on Remote Sensing Observations: The Case Study of Cape Trafalgar

et al. 2018

View full text Add to dashboard Cite

Cape Trafalgar has been highlighted as a hotspot of high chlorophyll concentrations, as well as a source of biomass for the Alborán Sea. It is located in an unique geographical framework between the Gulf of Cádiz (GoC), which is dominated by long-term seasonal variability, and the Strait of Gibraltar, which is mainly governed by short-term tidal variability. Furthermore, here bathymetry plays an important role in the upwelling of nutrient-rich waters. In order to study the spatial and temporal variability of chlorophyll-a in this region, 10 years of ocean colour observations using the MEdium Resolution Imaging Spectrometer (MERIS) were analysed through different approaches. An empirical orthogonal function decomposition distinguished two coastal zones with opposing phases that were analysed by wavelet methods in order to identify their temporal variability. In addition, to better understand the physical-biological interaction in these zones, the co-variation between chlorophyll-a and different environmental variables (wind, river discharge, and tidal current) was analysed. Zone 1, located on the GoC continental shelf, was characterised by a seasonal variability weakened by the influence of other environmental variables. Meanwhile, Zone 2, which represented the dynamics in Cape Trafalgar but did not show any clear pattern of variability, was strongly correlated with tidal current whose variability was probably determined by other drivers.

show abstract

“…Indeed, the Atlantic jet (AJ) feeds the WAG by means of a meandering structure of ~ 100-150 km of diameter and, occasionally, defines the Eastern Anticyclonic Gyre (EAG) as well ( Figure 1). This dynamic and complex system is regulated by the interaction of local and regional processes [30,32].…”

Section: Study Areamentioning

confidence: 99%

“…The main goal of these efforts was the understanding of the inter-annual variability of biomass in fish species, related to environmental condition. Many studies were realized on the Northern Alboran Sea [15,[30][31][32][33], but very few of them have been carried out on the southern part. We here recognize and analyze fluctuations of sardine's abundance at one of the most important fishing establish the proportional relationship between CPUE and abundance: CPUE = C t / E t = q N t [2] In practice, q is usually considered as a constant.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Impact of Temperature and Chlorophyll Variations on the Fluctuations of Sardine Abundance in Al-Hoceima (South Alboran Sea)

Abdellaoui¹,

Berraho²,

Falcini³

et al. 2017

J Marine Sci Res Dev

View full text Add to dashboard Cite

Landings of small pelagic fish in Moroccan Mediterranean Sea show large fluctuations and trends, a fact that has a considerable socio-economic impact. These changes are often related to the impact of the environmental conditions on recruitment processes. We investigate fluctuations of the sardine's abundance at one of the most important fishing areas of the Moroccan Mediterranean Sea (i.e., Al-Hoceima region) and try to assess the impact of environmental changes on the availability of pelagic fish in this area. In these regards, we analyzed Seasonal and Trends Loess' (STL) decomposition of time series between 2008 and 2015 of catch-per-unit-effort (CPUE) data along with environmental parameters (i.e., sea surface temperature and chlorophyll-a) from remote sensing and we applied nonlinear models (GAM). Results show an inverse relationship between fluctuations of sardine CPUE and sea surface temperature. Nonlinear relationships confirm that the temperature is the most important parameter affecting abundance, whereas chlorophyll-a, is generally, weakly correlated to the CPUE data at monthly and seasonal level variations, except for annual trends. The analysis also shows positive trend of chlorophyll-a, from 2003 and a negative one starting from 2011, revealing an inter-annual variability that support fish landings fluctuations. Modeling based on the relationships between the CPUE and temperature/chlorophyll-a, allowed better prediction of the sardine abundance in the Al-Hoceima fishing area (South Alboran Sea)..

show abstract

Wind driven upwelling along the African coast of the Strait of Gibraltar

Cited by 19 publications

References 9 publications

Modelling the Gibraltar Strait/Western Alboran Sea ecohydrodynamics

Modelling the Gibraltar Strait/Western Alboran Sea ecohydrodynamics

High-Chlorophyll-Area Assessment Based on Remote Sensing Observations: The Case Study of Cape Trafalgar

Assessing the Impact of Temperature and Chlorophyll Variations on the Fluctuations of Sardine Abundance in Al-Hoceima (South Alboran Sea)

Contact Info

Product

Resources

About