Cross-shore transport in a daily varying upwelling regime: A case study of barnacle larvae on the southwestern Iberian coast

Trindade, Ana; Peliz, Álvaro; Dias, Joaquim; Lamas, Luísa; Oliveira, Paulo B.; Cruz, Teresa

doi:10.1016/j.csr.2016.08.004

Cited by 6 publications

(6 citation statements)

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“…The fact that the wind diurnally undergoes relaxation and intensification strongly modifies the cross-shelf circulation, promoting superficial onshore flows at midday, in the leeside of Cape Sines, that overpower the strong along-shelf currents. The combination of these two wind regimes indicates that the study region has effective mechanisms of onshore transport during this period, as seen in Trindade et al (2016). The small-scale circulation patterns described here can be particularly helpful to understand the transport and settlement of larvae in this region and in other regions with similar topography and wind characteristics.…”

Section: Discussionmentioning

confidence: 92%

“…A recent work by Trindade et al (2016) that used the same model configuration as this study, but included tidal forcing, showed little differences between the modelled circulation during neap and spring tides. In their study, the model also failed to reproduce the 3-layer structure in the morning period.…”

Section: Discussionmentioning

confidence: 99%

“…The same salinity and temperature conditions are preserved near the open boundaries using a relaxation time scale (Marchesiello et al, 2001). Homogeneous surface heat fluxes with a fixed diurnal variability are used to maintain the stratification (more details in Trindade et al (2016)). …”

Section: Model Setupmentioning

confidence: 99%

“…South of the Cape, the shore is mostly rocky and crucial for many inter-tidal species including barnacles (Cruz et al, 2005). The processes of barnacle recruitment at this site have been under investigation for many years now, in the frame of various projects (Cruz, 1999;Cruz et al, 2005;Jacinto and Cruz, 2008;Cruz et al, 2009;Trindade et al, 2016). We used Eulerian velocity measurements collected at 12-m water depth in the lee of Cape Sines, over 3 consecutive summers (2006)(2007)(2008).…”

Section: Introductionmentioning

confidence: 99%

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Diurnal variability of inner-shelf circulation in the lee of a cape under upwelling conditions

Lamas

Peliz

Dias

et al. 2017

Continental Shelf Research

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to study the diurnal variability of the cross-shelf circulation. This period was chosen because it had a steady upwellingfavourable wind condition modulated by a diurnal cycle much similar to sea breeze.The daily variability of the observed cross-shelf circulation consisted of three distinct periods: a morning period with a 3-layer vertical structure with onshore velocities at mid-depth, a mid-day period where the flow is reversed and has a 2-layer structure with onshore velocities at the surface and offshore flow below, and, lastly, in the evening, a 2-layer period with intensified offshore velocities at the surface and onshore flow at the bottom. The observed cross-shelf circulation showed a peculiar vertical shape and diurnal variability different from several other systems described in literature. We hypothesize that the flow reversal of the cross-shelf circulation results as a response to the rapid change of the wind magnitude and direction at mid-day with the presence of the cape north of the mooring site influencing this response.A numerical modelling experiment exclusively forced by winds simulated successfully most of the circulation at the ADCP site, especially the mid-day reversal and the evening's upwelling-type structure. This supports the hypothesis that the cross-shelf circulation at diurnal timescales is mostly wind-driven. By analysing the 3D circulation in the vicinity of Cape Sines we came to the conclusion that the diurnal variability of the wind and the flow interaction with topography are responsible for the circulation variability at the ADCP site, though only a small region in the south of the cape showed a similar diurnal variability.The fact that the wind diurnally undergoes relaxation and intensification strongly affects the circulation, promoting superficial onshore flows in the leeside of Cape Sines. Despite the small-scale nature of the observed cross-shelf circulation, onshore flows as the ones described in this study can be particularly helpful to understand the transport and settlement of larvae in this region and in other regions with similar topography and wind characteristics.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Model Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diurnal variability of inner-shelf circulation in the lee of a cape under upwelling conditions

Lamas

Peliz

Dias

et al. 2017

Continental Shelf Research

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“…Outside the upwelling season, the presence of a poleward flow is a well-established characteristic along the Portuguese west coast (Relvas et al, 2009). However, tide may also change local-scale circulation, generating tidal currents that overlap wind-induced currents (Trindade et al, 2016). Coastal topography and bathymetry also play an important role in shaping coastal circulation at a local scale.…”

Section: Site Location and Production Characterizationmentioning

confidence: 99%

Coastal Water Quality in an Atlantic Sea Bass Farm Site (Sines, Portugal): A First Assessment

et al. 2020

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Aquaculture has become the fastest-growing sector of the food industry worldwide. The increase of intensive aquaculture practices, however, has been raising global concern about economic and social impacts, but mostly due to the associated potential environmental impacts. The aim of this report is to make a preliminary assessment of the impact of an intensive sea bass aquaculture (Dicentrarchus labrax, L. 1758) on surrounding coastal waters. The aquaculture site is located at the SW Iberian coast (Sines, Portugal), having 16 cages, each holding approximately 150,000 specimens at different stages of growth. We present a spatial and temporal description of environmental physical, chemical, and biological parameters taken in the course of four monitoring campaigns conducted between June 2018 and April 2019. All monitored parameters, except phosphate concentration in October only at one sampling station, showed values within the desirable ranges for marine finfish production and the natural range of Portuguese coastal waters. So far, results do not reveal any detrimental impact of the production units on local water quality, although more research is needed. The preliminary findings suggest that the lack of stress on the receiving waters may be attributed to the hydrodynamic regime in the production area, the feeding strategy, and the dimension of the production.

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Ten years of monitoring recruitment of the edible stalked barnacle Pollicipes pollicipes: linking to oceanographic variability

Fernandes

Jacinto

Penteado

et al. 2021

Limnology & Oceanography

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Understanding recruitment patterns of an exploited species is essential to predict changes in population dynamics and to improve its management and conservation. Temporal variability in recruitment of the edible stalked barnacle Pollicipes pollicipes was analyzed over a decade (consecutive annual recruitment seasons from 2007 to 2016) at a cape area located in the Canary‐Iberia Current Upwelling System (Cape of Sines, Southwestern Portugal), in terms of (1) the timing and length of the main recruitment season and (2) the variation in monthly and annual recruitment intensity and its relationship with several oceanographic variables. A longer recruitment season was detected, corresponding to approximately 9–10 months (June through either March or April of the following year, as in 2012, 2015, and 2016) in recent years, while a shorter recruitment season was detected between 2007 and 2010 (< 5 months, September–January in 2007 and July–December in 2010). Mean annual recruitment from 2012 to 2016 was about four times higher (ca. 43 recruits adult−1) than in the first 5 yr of the 10‐yr period (ca. 12 recruits adult−1). Correlation analyses between monthly recruitment and oceanographic variables revealed a significant positive correlation with sea surface temperature and a negative correlation with upwelling index. Results indicate a trend toward a longer recruitment season and a higher recruitment intensity in recent years (2012–2016), and a clear association between recruitment of P. pollicipes and both relaxation of upwelling and seawater warming.

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Cross-shore transport in a daily varying upwelling regime: A case study of barnacle larvae on the southwestern Iberian coast

Cited by 6 publications

References 39 publications

Diurnal variability of inner-shelf circulation in the lee of a cape under upwelling conditions

Diurnal variability of inner-shelf circulation in the lee of a cape under upwelling conditions

Coastal Water Quality in an Atlantic Sea Bass Farm Site (Sines, Portugal): A First Assessment

Ten years of monitoring recruitment of the edible stalked barnacle Pollicipes pollicipes: linking to oceanographic variability

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