Luisa Lamas

Instituto Hidrográfico | IH · Oceanografia

The nearshore circulation in the lee of a cape under upwelling conditions was studied using in-situ data from 3 consecutive summers (2006–2008). Focus was given to a period between 20 July and 04 August 2006 to study the diurnal variability of the cross-shelf circulation. This period was chosen because it had a steady upwelling-favourable wind cond...

First observational evidence of time-mean cyclonic recirculation southwest of Iberia is presented. Data sets of hydrography, satellite altimetry and surface drifters velocities are analyzed jointly in order to obtain an accurate time-averaged circulation in the mid-latitude northeast Atlantic off the Gulf of Cadiz. A cyclonic recirculation cell wit...

In this study, the relationships between sea surface temperature (SST), chlorophyll-a (Chl-a) concentration and catch locations of sardine (Sardina pilchardus) and Atlantic chub mackerel (Scomber colias) were explored using satellite-derived SST and Chl-a together with fishing activity data for the southern and southwestern Portuguese coasts for th...

With favored offshore and downstream advection, the question of which physical mechanism may promote onshore transport of larvae in upwelling systems is of central interest. We have conducted a semi-realistic high resolution (0.25 km) numerical study of Lagrangian transports across the inner-shelf under upwelling-favorable wind forcing conditions,...

Salinity is one of the oldest parameters being measured in oceanography and one of the most important to study in the context of climate change. However, its quantification by satellite remote sensing has been a relatively recent achievement. Currently, after over ten years of data gathering, there are still many challenges in quantifying salinity...

The final outcomes and recommendations were discussed at the final session of the workshop and endorsed by review of the workshop report. Final discussion points included whether there is a need for a specific header in the Global Telecommunications System (GTS) for HRSST buoys, as requested by an Numerical Weather Prediction (NWP) center. It was c...

A utilização de metodologias de derivação de batimetria por satélite (Satellite-Derived Bathymetry-SDB) recorrendo a imagens multiespectrais e Synthetic Aperture Radar (SAR) tem sido uma abordagem válida para caracterizar a dinâmica dos fundos costeiros. As metodologias SDB aplicadas a imagens multiespectrais que utilizam algoritmos empíricos neces...

In this study an optical empirical algorithm was used to evaluate the robustness of some experimental processes to derive Satellite-Derived Bathymetric (SDB) models for shallow waters in the Minho river mouth, Caminha, Portugal. Multiple procedures to calibrate and modelling SDB calculation were tested. Regarding to these procedures, the following...

In coastal areas bathymetric data is needed for many activities such as safety of navigation or coastal dynamics monitoring. Nowadays, Satellite Derived Bathymetry (SDB) is usually accepted as a valid tool to derive bathymetric models for shallow waters where hydrographic surveys tend not be done at all. The objective of this study is to evaluate t...

Resumo: No âmbito do projeto Horizon 2020 Coastal Waters Research Synergy Framework (H2020 Co-ReSyF), o Instituto Hidrográfico (IH) tem contribuído para o desenvolvimento e validação de metodologias de extração de informação batimétrica a partir de imagens de satélite (Satellite Derived Bathymetry-SDB) multiespectrais e SAR. O presente artigo prete...

In maritime areas where safety of navigation is an essential issue, such as ports, harbours and waterways, hydro-graphic surveys are regularly performed by traditional echo sounder systems. However, in coastal areas with low maritime traffic, safety of navigation is usually of minor concern and consequently hydrographic surveys tends to be performe...

Bakun, A. (2006). Fronts and eddies as key structures in the habitat of marine fish larvae: Opportunity, adaptive response and competitive advantage. Scientia Marina, 70(SUPPL. 2), 105-122. Klemas, V. (2013). Fisheries applications of remote sensing: an overview. Fisheries Research, 148, 124–136. Lanz, E., López-Martínez, J., Nevárez-Martínez, M. &...

The circulation over the inner-shelf is a key component of shelf dynamics and an important mechanism for cross-shore exchange on most shelves. Yet our understanding of the cross-shore circulation and how it depends on different forcing conditions, bathymetry and stratification remains poor due in part to sparse observations and the difficulty of re...

The circulation over the inner-shelf is a key component of shelf dynamics and an important mechanism for cross-shore exchange on most shelves. Yet our understanding of the cross-shore circulation and how it depends on different forcing conditions, bathymetry and stratification remains poor due in part to sparse observations and the difficulty of re...

Velocity measurements from 4 bottom-mounted ADCP deployments (summers of 2006, 2007, 2008 and 2011) at a 12-m depth site off Sines, Portugal, complemented with time series of winds, waves and tides, are used to study the inner-shelf cross-shore flow dependence on wave, tidal and wind forcings. During these four summers, the dominating winds are fro...

Evidence of a cyclonic recirculation off SW Iberia from ARGO and Altimetric data.