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Rui M A Caldeira

Rui M A Caldeira
ARDITI - Agência Regional para o Desenvolvimento da Investigação Tecnologia e Inovação, Madeira, Portugal · OOM - Oceanic Observatory of Madeira

PhD, UCLA, 2002

About

74
Publications
16,576
Reads
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1,040
Citations
Citations since 2016
36 Research Items
827 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Introduction
Originally trained as a physical oceanographer, I am currently interested in studying boundary layer processes in geophysical fluids i.e. ocean and atmosphere. In recent years, I have focused on the study of island-induced boundary layer perturbations. Island wakes generate a rich variety of (sub-) mesoscale systems such as eddies, fronts, upwelling cells, filaments and jets. I am also involved in studies of the lower atmospheric boundary layer and its response to ocean feedbacks.
Additional affiliations
September 2015 - May 2018
ARDITI - Agência Regional para o Desenvolvimento da Investigação Tecnologia e Inovação, Madeira, Portugal
Position
  • Group Leader
February 2009 - present
University of Porto
Position
  • PostDoc Position
October 1997 - September 2002
University of California, Los Angeles
Position
  • PhD Student

Publications

Publications (74)
Article
Full-text available
The Island Mass Effect has been primarily attributed to nutrient enhancement of waters surrounding oceanic islands due to physical processes, whereas the role of land runoff has seldom been considered. Land runoff can be particularly relevant in mountainous islands, highly susceptible to torrential rainfall that rapidly leads to flash floods. Madei...
Article
Full-text available
Species distributional estimates are an essential tool to improve and implement effective conservation and management measures. Nevertheless, obtaining accurate distributional estimates remains a challenge in many cases, especially when looking at the marine environment, mainly due to the species mobility and habitat dynamism. Ecosystems surroundin...
Article
Full-text available
This outreach article explains the importance of ocean currents in transporting particles, organisms, and litter across large oceanic basins.
Article
Full-text available
Using the 13 m diameter LEGI-Coriolis rotating platform, the evolution processes of a generated anticyclonic eddy throughout its lifecycle are analyzed. Experimental results have shown that the eddy lasted for approximately 3T0, where T0 is the rotating period of 90 s. After T = 0.3T0, the eddy enters its mature phase, whereby following this event,...
Article
Full-text available
The constant increase of marine plastic pollution poses an unprecedented risk to oceanic islands, which become increasingly exposed to a hazard of which they have very little control. Located in the Northeast Atlantic Ocean, the Macaronesia is comprised by the Azores, Madeira, Canary Islands, and Cabo Verde. Although past studies suggest that most...
Article
Full-text available
The interaction between the incoming winds with high mountainous islands produces a wind-sheltered area in the leeward side, known as the atmospheric wake. In addition to weaker winds, the wake is also characterized by a clearing of clouds, resulting in intense solar radiation reaching the sea surface. As a consequence, a warm oceanic wake forms on...
Article
Full-text available
The present study assesses the thermal variability of the regional ocean around Madeira Island, in intraseasonal and interdecadal time scales, using a 35-year (1983-2017), 3-km horizontal resolution ocean simulation forced by a co-located atmospheric simulation, with SODA and ERA5 boundary and initial conditions, respectively. Atmosphere-ocean inte...
Article
Full-text available
During the summer months, the northeasterly trade winds impinging on Madeira Island lead to the establishment of a quasi‐permanent wind pattern with two tip jets emerging near the western and eastern island tips. These jets respond to subtle changes of the upstream flow with an amplified signal, and a high‐resolution simulation of the regional atmo...
Article
Full-text available
Mesopelagic organisms play an important role in the vertical carbon flux through diel vertical migrations. The mesopelagic fauna of three NE Atlantic seamounts (Gorringe Bank, Josephine and Seine) and surrounding oceanic waters were sampled. Echogram scrutiny suggests a diel vertical migration of the mesopelagic fauna. Muggiaea atlantica and Megany...
Article
Madeira island is a well‐known source of atmospheric and oceanic eddy activity, with relevant downstream impact in both media. Previous studies focused on the dynamics of the island wake environment, suggesting the relevance of different atmosphere–ocean interactions in its maintenance. Here, results from one summer (2‐month) fully coupled atmosphe...
Article
Full-text available
Within the Portuguese Exclusive Economic Zone, the Great Meteor and Madeira-Tore complexes are highly productive areas, which are likely to be classified as marine protected areas (MPAs) due to their ecological vulnerability. This was the main focus of the BIOMETORE project and, framed on it, the aim of the present study was to investigate the phys...
Article
Underwater gliders are energy-efficient vehicles that rely on changes in buoyancy in order to convert up and down movement into forward displacement. These vehicles are conceived as multi-sensor platforms, and can be used to collect ocean data for long periods in wide range areas. This endurance is achieved at the cost of low speed, which requires...
Poster
Full-text available
Deep-ocean islands have long been associated with the generation of oceanic eddies in their wakes, but their interaction with incoming eddies has seldom been considered. This study aimed to fill this gap, focusing in the Cabo Verde Archipelago between 2003-2014, an ideal location given the complex islands disposition and shape, and its exposure to...
Article
The importance of seamounts as foraging hotspots for cetaceans depends on interactions between ocean flow and topographical features that concentrate prey. However, the oceanographic processes driving these aggregations are still unclear. Here, we analyzed two months of passive acoustic recordings from two remote seamounts in the Northeast Atlantic...
Article
In order to characterize the coccolithophore community around the Madeira archipelago and to understand the effect of a transient frontal zone on its distribution, 149 seawater samples from the first 150 m were collected in 37 stations, during the research cruise POS466 of RV Poseidon. The present study revealed the occurrence of two biogeographic...
Conference Paper
Planning a glider mission in an uncertain environment, with multiple parameters at the same time is a hard 4D (longitude, latitude, depth, time) Multi-Objective Optimization Problem. Multiple approaches are being used to do Glider Path Planning. In this work, we present a new system for helping multi-objective glider path planning in real missions,...
Conference Paper
The Macaronesia is a vast area playing a key role in the East boundary of the Central North-Atlantic Ocean- circulation system. Despite a significant research activity in ocean monitoring for decades using a wide range of observing systems and methodologies, the area is still under-sampled, mainly due access and coverage constrains, as well as the...
Article
Full-text available
Most sea turtle species spend part of, or their entire juvenile stage in pelagic habitats. A key question is how pelagic turtles exploit their environment to optimize prey intake and maximize fitness. This study combined animal telemetry with remote-sensed environmental data to quantify the drivers and patterns of foraging behavior of juvenile logg...
Article
The COAWST (Coupled Ocean-Atmosphere-Wave-Sediment Transport) modelling system is used in different configurations to simulate the Iberian upwelling during the 2012 summer, aiming to assess the atmosphere-ocean feedbacks in the upwelling dynamics. When model results are compared with satellite measurements and in-situ data, two-way coupling is foun...
Article
High Amplitude Internal Waves (HAIWs) are physical processes observed in the Strait of Gibraltar (the narrow channel between the Atlantic Ocean and the Mediterranean Sea). These internal waves are generated over the Camarinal Sill (western side of the strait) during the tidal outflow (toward the Atlantic Ocean) when critical hydraulic conditions ar...
Article
Since the term “ocean literacy” (OL) was proposed in 2004 by a group of professionals dedicated to ocean sciences, marine education, and general education policies, its principles have spread worldwide. In order to better understand OL-related research a bibliometric analysis was performed with data from databases obtained from Scopus and Web of Sc...
Article
Full-text available
Recent technological advances over the past few decades have enabled the development of fully coupled atmosphere-ocean modeling prediction systems that are used today to support short-term (days to weeks) and medium-term (10–21 days) needs for both the operational and research communities. We overview the coupling framework, including model compone...
Article
Full-text available
A realistic nested data-assimilating two-way coupled ocean/atmosphere modeling study (highest resolution 2 km) of Madeira Island was conducted for June 2011, when conditions were favorable for atmospheric vortex shedding. The simulation's island lee region exhibited relatively cloud-free conditions, promoting warmer ocean temperatures (∼2°C higher...
Article
A forest fire started on August 8th, 2016 in several places on Madeira Island causing damage and casualties. As of August 10th the local media had reported the death of three people, over 200 people injured, over 950 habitants evacuated, and 50 houses damaged. This study presents the preliminary results of the assessment of several spectral indices...
Poster
Full-text available
The Strait of Gibraltar is the only connection between Atlantic and Mediterranean waters, where an inverse estuarine circulation is formed. Atlantic water flows above denser Mediterranean layer in order to compensate due to evaporation in the Mediterranean Sea. Mediterranean outflow is controlled on the Atlantic side by a topographic constriction,...
Article
Full-text available
The goal of this study is to characterize the meteorological and oceanographic conditions affecting the Azores Archipelago, and explore their biological implications. The Mid-Atlantic region of the Azores Archipelago is under the permanent influence of the Azores high pressure system, thereby providing sustained Ekman transport that facilitates the...
Article
Full-text available
ABSTRACTAn ocean circulation forecasting model for the Madeira Archipelago is operational since May 2010. Developing a forecasting system for a small island oceanic region, deprived from in-situ observations, is a challenging task since there are limited ways to validate predictions. Furthermore, model resolution concurrent with insufficient comput...
Poster
Full-text available
Understand the general routes of dispersion mediated by ocean currents is of special interest for fisheries management and conservation biology, being a very useful tool in the definition of protected areas. This knowledge is inestimable in the particular case of the Azores Island, a hot-spot of biodiversity in the Atlantic Ocean. A first approach...
Article
Full-text available
The capacity of the Azores Archipelago to capture and retain incoming particles and organisms that are drifting with the oceanic currents was the main focus of this study. Using the Hybrid Coordinate Ocean Model coupled with the Connectivity Modeling System (an offline Lagrangian tool) a series of experiments were conducted to determine: i) the ori...
Article
Full-text available
The island of Madeira is well known for giving rise to atmospheric wakes. Strong and unsteady atmospheric wakes, resembling a von Kármán vortex street, are frequently observed in satellite images leeward of Madeira, especially during summer months, when conditions favoring the formation of atmospheric wakes occur frequently under the influence of t...
Article
Full-text available
In the Portuguese Economic Exclusive Zone (EEZ) (NE Atlantic), little survey effort dedicated to cetacean species has been carried out in offshore waters. As a consequence, data on their occurrence, distribution and habitat preferences is scarce. In this area, 48 sea surveys along fixed transects within Continental Portugal and Madeira Island were...
Poster
Full-text available
The study of the transport by ocean currents has important applications for fisheries, conservation biology, pollution control, military and rescue missions, amongst others Using Ariane (an off-line Lagrangian tool) coupled to a Regional Oceanic Modeling System (ROMS) were mapped the general transport pathways of the northeast Atlantic Ocean. After...
Article
Full-text available
We study numerically the role of mesoscale structures in the Ligurian Sea (NW Mediterranean Sea) as a possible factor affecting the spatial distribution of the chlorophyll spring bloom. We use the Regional Ocean Modeling System (ROMS) configured for the NW Mediterranean Sea (ROMS_NWMed) and satellite derived Altimetric, Sea Surface Temperature and...
Conference Paper
Full-text available
River plumes are one of the most important mechanisms that transport the terrestrial materials to the coast and the ocean. Some examples of those materials are pollutants, essential nutrients, which enhance the phytoplankton productivity or sediments, which settle on the seabed producing modifications on the bathymetry affecting the navigation chan...
Article
Island wakes are areas of a strong eddy activity influencing the availability and transport of organic matter in the ocean which, in turn impact biological productivity. Despite this, eddy formation in the lee of North Atlantic tropical islands is scarcely documented, except for the Canary islands. Moreover, the occurrence of anticyclones leeward o...
Article
Full-text available
Large-scale laboratory experiments were performed on the Coriolis rotating platform to study the stability of intense vortices in a thin stratified layer. A linear salt stratification was set in the upper layer on top of a thick barotropic layer, and a cylinder was towed in the upper layer to produce shallow cyclones and anticyclones of similar siz...
Article
Full-text available
This study focused on mapping the general transport pathways of the northeast Atlantic Ocean by using the Regional Oceanic Modeling System to calculate ocean current velocity components (u, v, w), and Ariane (an off-line Fortran code dedicated to the computation of three-dimensional streamlines from velocity fields) to calculate the transport of pa...
Conference Paper
Full-text available
Cetaceans are ecologically important as storers and transporters of energy in marine ecosystems. They are top-down regulators maintaining the prey-predator balance in these complex and dynamic environments. Therefore, the understanding of cetacean distribution and habitat preferences represents a priority issue in marine conservation being an impor...
Article
This study assesses the influence of the atmospheric wind-wake of the Madeira Island on oceanic-eddy generation. Ocean surface wind fields derived from the QuikSCAT scatterometer were compared to the Weather Research and Forecast (WRF) modeled winds at 6 km resolution. The main difference between the two wind products is found southwest of Madeira...
Article
Full-text available
A high-resolution ocean circulation modelling system forced with a high-resolution numerical wind product was used to study the mesoscale and sub-mesoscale eddy population of the North-Western Mediterranean Sea, contrasting eddy-activity between the Tyrrhenian and Ligurian sub-basins. Numerical solutions reproduced some of the known regional dynami...
Article
Full-text available
Idealized studies of island wakes often use a cylinder-like island to generate the wake, whereas most realistic studies use a close representation of the oceanic bathymetry immersed in a complex representation of the “ambient” geophysical flows. Here, a system of multiple islands was placed into numerical and experimental channels, in order to focu...
Article
Full-text available
This discussion focused on the numerical study of a wake episode. The Weather Research and Forecasting model was used in a downscale mode. The current literature focuses the discussion on the adiabatic dynamics of atmospheric wakes. Changes in mountain height and consequently on its relation to the atmospheric inversion layer should explain the shi...
Conference Paper
Full-text available
While sea surface oceanographic processes are well observed and described worldwide by remote sensing satellites, availability of oceanographic data related to water column still lack the desired spatial and temporal resolution. Nevertheless, cetacean distribution is more likely to be driven by environmental condition of deeper waters rather than s...
Article
Full-text available
We study the mesoscale dynamics in the Ligurian Basin (NW Mediterranean Sea), combining the use of numerical models with satellite and in situ data. To this end, we use the Regional Ocean Modeling System (ROMS) configured at a resolution of 3 Km for a domain covering the West Mediterranean Sea. The model is forced with daily-mean boundary (oceanic)...
Article
Full-text available
In contrast with the behavior of the eddies in the open-ocean, the sub-mesoscale eddies generated in the constricted Ligurian Basin (NW Mediterranean), are unproductive but their combined effect, arranged in a rim-like fashion, contributes to the containment of a Productive Ligurian Pool (PLP). Data de- rived from MODIS satellite sensor showed pers...