Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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Coastal raptors and raiders: New bird tracks in the Pleistocene of SW Iberian Peninsula
(Elsevier Ltd., 2023-06-22) Neto de Carvalho, Carlos; Belo, Joao; Figueiredo, Silvério; Cunha, Pedro P.; Muñiz, Fernando; Belaústegui Barahona, Zain; Cachao, Mário; Rodríguez-Vidal, Joaquín; Cáceres, Luis M.; Baucon, Andrea; Murray, Andrew S.; Buylaert, Jan-Pieter; Zhang, Yuping; Ferreira, Cristiana; Toscano, Antonio; Gómez, Paula; Ramírez, Samuel; Finlayson, Geraldine; Finlayson, Stewart; Finlayson, Clive
Avian traces occurring in Pleistocene aeolianite and beach deposits are rare and relatively poorly known, despite being good paleoenvironmental indicators. Passeriform and raptorial birds are especially rare in the track fossil record. Exceptional tracksites were found in the Malhão formation, a Pleistocene coastal aeolianite unit from the SW mainland Portugal, with subunits in the interval ∼187 to ∼27 ka. Two new forms of avian traces were identified, Corvidichnus odemirensis and Buboichnus vicentinus - attributed to the locomotion of Western jackdaw and the locomotion and predation/feeding behaviour of a large Eagle-owl. The last trace fossil may correspond to the first evidence of a raptorial bird-prey interaction found in action in the fossil record. Typical shorebird tracks and trackways attributed to gulls (Laridae) and curlews, and others tentatively compared with Rallidae, such as Eurasian coot, are also discussed within the aeolianite ichnoassemblages. The tracks here described are the first avian ichnotaxa from the Pleistocene of Europe.
Ichnogeny and bivalve bioerosion: examples from shell and wood substrates
(Taylor & Francis, 2020-04) Belaústegui Barahona, Zain; Muñiz, Fernando; Domènech, Rosa; Martinell, Jordi, 1948-
The ichnospecies Gastrochaneolites dijugus Kelly and Bromley 1984 and Teredolites longissimus Kelly and Bromley 1984, attributed to the boring activity of gastrochaenoid and pholadid bivalves, are described respectively from the Miocene Vilanova Basin and the Pliocene Almería-Níjar Basin. Miocene and Pliocene traces are preserved as positive casts associated to invertebrate shells and wood fragments, respectively; in both cases, the host substrate (shells and wood) has been lost almost entirely by different taphonomic processes (mainly dissolution). For the first time in the fossil record, the complete ichnogenetic sequence of these two ichnospecies is described and figured.
Estrellichnus jacaensis from the Eocene Jaca Basin of NE Spain: new locality and new ethological interpretation
(John Wiley & Sons, 2020-01) Adserá, Pedro; Belaústegui Barahona, Zain; Uchman, Alfred
New occurrences of Estrellichnus jacaensis in the deep‐marine turbidite deposits of the Eocene Hecho Group (Fiscal, Huesca, NE Spain) are described. Most of them include specimens preserved as 'urban fossils' located in several villages of the south‐central Pyrenees. Well‐preserved morphological features of the new specimens studied and their interactions with accompanying ichnotaxa allow reinterpreting the constructional process and functional significance of Estrellichnus and its rejection as a graphoglyptid. The comparison of this ichnogenus with lebensspuren recorded in oceans and seas around the world has allowed finding a plausible current analogue and proposing a likely tracemaker.
Helical crustacean burrows: Gyrolithes ichnofabrics from the Pliocene of Lepe (Huelva, SW Spain)
(Society of Economic Paleontologists and Mineralogists., 2019-01) Muñiz, Fernando; Belaústegui Barahona, Zain
Two ichnofabrics characterized by abundant vertical and helical burrows (ichnogenus Gyrolithes) are described from the Pliocene siliciclastic facies of the southwestern sector of the Guadalquivir Basin (Lepe, Huelva, SW Spain). These ichnofabrics, associated with shallow and marginal marine environments, characterize two consecutive and concordant stratigraphic units: (1) the lower one is dominated by G. nodosus (together with other pellet-lined ichnotaxa), occurs in fine- to medium-grained, massive sands and silty sands, and is characterized by moderate to high bioturbation; (2) the upper ichnofabric is dominated by G. variabilis (and other unlined ichnofossils), occurs in sandy silts, and is characterized by low to high bioturbation. The transition of these two ichnofabrics clearly reflects the ability of an infaunal community to assimilate environmental changes over time. Additionally, new observations at the type locality of G. nodosus, the description of a new locality for G. variabilis and review of existing literature on this ichnogenus have provided the bases for emending the diagnoses of both ichnospecies, to propose a neotype for G. nodosus and to suggest a new type locality for G. variabilis. According to the main architectural features of Gyrolithes specimens studied herein and by comparison with modern analogues, 'thalassinidean' shrimps are proposed as their most likely tracemakers. Although it is known that these kinds of crustaceans exhibit a great variability in regards to their burrowing behaviors, further study is needed in order to more fully understand the purpose of these helical bioturbation structures.
An Ichnofossil-lagerstätte from the miocene vilanova basin (ne spain): taphonomic and paleoecologic insights related to bioerosion structures.
(Society of Economic Paleontologists and Mineralogists., 2018-01) Belaústegui Barahona, Zain; Domènech, Rosa; Martinell, Jordi, 1948-
A new ichnofossil-Lagerst¨atte from the Miocene Vilanova Basin (NE Spain) is described. It is characterized by bioerosion structures that are exceptionally preserved as positive casts, many associated with internal and external molds of mollusk shells (gastropods and bivalves). Five main ichnotaxa were identified: Caulostrepsis contorta, C. taeniola, Entobia cateniformis, E. geometrica, and Gastrochaenolites dijugus, produced by annelids, sponges and bivalves, respectively. Combination of ichnological, taphonomical, and systematic data allows the concentration to be interpreted as the result of several storm events that mixed shells from a diverse array of marine environments during the biostratinomical phase. Bioerosive episodes took place before and after storms, and diagenetic processes produced external and internal shell molds and fine casts of the borings.
BOOK REVIEW. M. Gabriela Mángano & Luis A. Buatois (eds) (two volumes). 2016. The trace-fossil record of major evolutionary events. Volume 1: Precambrian and Paleozoic. Springer. Topics in Geobiology, 39, 358 pp. (ISBN 978-94-017-9599-9). The trace-fossil record of major evolutionary events. Volume 2: Mesozoic and Cenozoic. Springer. Topics in Geobiology, 40, 485 pp. (ISBN 978-94-017-9596-8).
(Sociedad Española de Paleontología, 2017-07) Belaústegui Barahona, Zain
Without abstract.
Icnofacies de Glossifungites en el Mioceno del Mas de les Pardinetes (Oeste de Alcoy)
(Asociación Paleontológica Alcoyana, 2017-12) Belaústegui Barahona, Zain
Se estudian las trazas fósiles del Mioceno del Mas de les Pardinetes (oeste de Alcoy). Los icnotaxones identificados: Glossifungites saxicava Łomnicki, 1886, Spongeliomorpha iberica Saporta, 1887 y Gastrochaenolites ornatus Kelly y Bromley, 1984, constituyen la icnocenosis típica de una icnofacies de Glossifungites. Por primera vez en el registro fósil, se identifica la presencia de cirrípedos balanomorfos colonizando el interior de madrigueras.
An alternative experimental configuration to generate wrench zone above a viscous layer
(Elsevier Ltd., 2024-05-15) Vendeville, B.C.; Corti, G.; Boussarsar, M.; Ferrer García, J. Oriol (José Oriol)
Analogue modelling of wrench tectonics typically utilizes a rigid basement with a velocity discontinuity under a brittle or brittle-viscous cover, such as in Riedel experiments, which confines fault localization in the overlaying model. However, such a set-up is hardly compatible with modeling brittle-ductile systems such as the upper and lower crust or a brittle sedimentary cover overlying a viscous evaporitic layer. To achieve a more realistic experimental approach, Bruno Vendeville designed an alternative experimental set-up decoupling the basement from the brittle overburden with a viscous layer in which the basement is not involved. In this configuration, strike-slip movement is driven laterally rather than from the base up, facilitated by “weak zones” that preferentially localize the deformation during shortening and enable sliding between compartments. This original approach provides greater flexibility for modeling complex strike-slip settings, allowing for more freedom for strike-slip structures to form and evolve through time.Although the experiments described in this work were conducted in the late 1990s, the co-authors have chosen to revisit and adapt this earlier work for this Special Issue to underscore Bruno's influence on another aspect of salt tectonics and his pioneering foresight in the field of analogue modelling.
Formation and growth of diapirs in contractional settings: the Mediano anticline and Clamosa diapir case study (Southern Pyrenees)
(European Geosciences Union (EGU), 2025-10-02) Santolaria, Pablo; Silva-Casal, Roi; Carrera García de Cortázar, Núria; Muñoz, J. A.; Arbués, Pau; Granado, Pablo
At the northwestern termination of the South Pyrenean Central Salient, thrust imbrication, detachment folding and diapirism are structurally and genetically related. The La Fueba imbricate system has been folded by the Mediano detachment anticline, while this fold connects with the Clamosa diapir. Together, this structural-stratigraphic trinity provides an excellent example to evaluate the factors controlling purely contractional diapirs in onshore-offshore contractional fold-thrust systems. Our study integrates detailed geological mapping, a large structural dataset, new biostratigraphic data, and interpretations of well-tied depth-converted seismic lines and cross-sections. A combined evolutionary model for contractional diapirs formation and evolution is presented. While less common than in extensional settings, the interplay of shortening of a salt horizon along with vertical axis rotations and local stretching and erosion of the overburden can lead to purely contractional salt diapirs.
Reframing jellyfish perception from “enemies” to “helpers” through Ocean Literacy
(Frontiers, 2025-10-02) Salazar, Janire; Marambio, Macarena; Ballesteros, Ainara; Vendrell Simón, Begoña; Gili, Josep Maria, 1953-
Despite covering three-quarters of Earth’s surface and comprising 99% of its habitable space, the ocean remains underrepresented in formal education, contributing to widespread Ocean Literacy (OL) deficits. Jellyfish – among the earliest metazoans – inhabit all ocean basins and play vital ecological roles. Yet, they are often misrepresented and negatively perceived due to the impacts of jellyfish blooms – phenomena often linked to anthropogenic pressures – on human activities. These blooms not only have ecological consequences but also reflect a broader disconnect between society and the ocean, highlighting the need to promote awareness and foster sustainable behaviors. To help address this gap, a marine research group developed an initiative introducing OL concepts using jellyfish as a flagship species in the context of global change. In collaboration with educators, primary school teachers and students from Catalonia and Asturias (Spain), jellyfish-centered educational interventions were co-developed and tested, including teacher training, classroom implementation and open-access educational resources. Pre- and post- intervention assessments of students and teachers revealed significant improvements in marine knowledge and the development of sustainable behaviors. OL tests revealed similar misconceptions and knowledge gaps in both regions, which declined markedly after the interventions. The autonomous application of the resources by teachers without direct scientific facilitation also yielded significant learning gains. Further teacher interviews two years post-intervention showed that the initiative fostered long-term engagement. By reframing the increase in jellyfish blooms as a potential indicator of anthropogenic pressure rather than a threat, this approach contributes to cultivating ocean-aware, engaged communities committed to addressing global environmental challenges.
Paleogene kinematics of the central Catalan Coastal Ranges: temporal constraints from magneto-chronology and provenance analysis in synorogenic deposits in the SE margin of the Ebro Basin (NE Spain)
((UB). (ICTJA). (IDEA). (UAB). (CSIC), 2025-02-01) Marín, Miquel; Carola i Molas, Eloi; Beamud Amorós, Elisabet; Bover-Arnal, Telm; López Blanco, Miguel; Garcés Crespo, Miguel; Roca i Abella, Eduard; Costa Gisbert, Elisenda; Ferrer García, J. Oriol (José Oriol); Cabrera, Lluís
The precise determination of the tectonic deformation timing such as thrust emplacement has always been a challenge for understanding the evolution of fold-and-thrust belts. In the Catalan Coastal Ranges, this issue has traditionally been addressed through the mapping and the analysis of the syn-tectonic successions preserved in the SE margin of the Ebro Basin. However, the age of the Paleogene contractional structures located towards the hinterland and responsible of the inversion and uplift of the inherited Mesozoic structure remained uncertain due to the lack of preserved syn-kinematic strata in these areas. With the aim of better understand the contractional evolution of the area during the Paleogene, this work presents a tectono-stratigraphic analysis approach that combines structural reconstructions, provenance analysis and magnetostratigraphic dating in well-exposed synorogenic sediments in the central SE margin of the Ebro Basin. The results of the study allow to establish the precise age of the main contractional structures present in the central Catalan Coastal Ranges. The combined analysis has revealed that: i) the inversion of the Montmell-Vallès Faults System started in the Bartonian and continued up to the late Priabonian,and ii) the emplacement of the Gaià-El Camp Thrust and the formation of the Cabra-Carme Anticline took place from early to late Priabonian and was the responsible of the sudden increased of the sedimentation rates. A later decrease of the sedimentation rates during late Priabonian (chron C15n) has been interpreted as the prelude of the end of the Paleogene compressional phase in the area.
The non-marine Lower Cretaceous of El Montsec thrust-sheet (South-Central Pyrenees)
((UB). (ICTJA). (IDEA). (UAB). (CSIC), 2025-03-25) Martín-Closas, Carles; Lozano-Fernández, Iván; Pérez Cano, Jordi; Bover-Arnal, Telm
The aim of this study is resolving uncertainties on the lithostratigraphy and chronostratigraphy of the non-marine Lower Cretaceous of El Montsec thrust sheet, which contains the most developed record of such facies in the central Pyrenees (Catalonia, Spain). The materials, traditionally known as “El Montsec Charophyte Limestones”, overlie upper Berriasian marine limestones and belong in fact to two different stratigraphic units, separated by an angular unconformity, which is represented by an irregular karstic surface. The lower unit, newly defined as the Cova dels Lladres Intraclastic Limestone Formation, is composed by metric-scale fining-upward parasequences with black intraclast conglomerates at the base overed by charophyte limestones at the top. This first nonmarine unit is attributed to the lower Barremian Eurasian charophyte biozone Atopochara trivolvis triquetra. The upper non-marine unit, (revisited El Montsec Charophyte Limestone), is made of metric-scale fining-upward parasequences of charophyte limestones. Ferruginous marls at the base of the upper unit have yielded charophytes of the Hemiclavator neimongolensis neimongolensis Eurasian charophyte biozone, corresponding to the early–late Barremian boundary. El Montsec Charophyte Limestone Formation transitions laterally to La Pedrera de Rúbies Lithographic Limestones Formation, which includes the two famous fossil Konservat Lagerstätten of La Pedrera de Meià and La Cabroa. In sum, the non-marine Lower Cretaceous succession of El Montsec thrust sheet shows at its base a stratigraphic gap ranging from the upper Berriasian to the early Barremian. Furthermore, the angular unconformity separating the Cova dels Lladres Formation and El Montsec Formation clearly reflects the strong tectonic activity associated with the Barremian Iberian rift, which has been linked with the opening of the Bay of Biscay.
A refugium for charophytes during the maximum post-Palaeozoic sea-level highstand in the Turonian of Tarragona (Catalonia, Spain)
((UB). (ICTJA). (IDEA). (UAB). (CSIC), 2025-06-04) Martín-Closas, Carles; Albalat, David; Colombo, Ferran; Vilà, Miquel; Vicente, Alba; Ossó, Àlex; Vicedo, Vicent; Bover-Arnal, Telm
During the Cenomanian–Turonian interval, Europe was largely submerged under a shallow tropical sea within the Cretaceous Tethyan Archipelago, limiting non-marine lacustrine habitats to a few coastal lakes on the islands. This study reports an island refugium for charophytes in the Upper Cretaceous of Tarragona located at the palaeo-shores of the former Ebro Massif. The Upper Cretaceous of Tarragona comprises three carbonate formations that record a Cenomanian–Turonian transgressive-regressive sequence. This sequence is represented by a shallow marine platform to pelagic facies at the base, overlain by lacustrine and palustrine facies at the top. These non-marine deposits are newly attributed to the Turonian, based on the stratigraphic context and the presence of the species Atopochara trivolvis var. multivolvis. In addition to this dominant species, the charophyte assemblage contains a clavatoroidean species, represented by the thallus Munieria grambastii forma sarda, and is associated with freshwater gastropods. A. trivolvis var. multivolvis had a wide distribution in the Northern Hemisphere at a palaeolatitude of around 40ºN, occurring in the United States, Spain, France, and Armenia. The European localities suggest that the island charophyte flora in the Cretaceous Tethyan Archipelago was an impoverished version of the prehighstand Early Cretaceous flora, which was dominated by clavatoraceans. This contrasts with coeval floras from the mainland (Chinese and Argentinian basins), where Turonian charophyte communities were diverse and already dominated by modern characean genera. The island lakes acted as refugia for the last clavatoracean-dominated charophyte communities before their complete replacement by modern characean communities during the latest Cretaceous.
Cementación temprana por calcita en un frente deltaico deescala métrica: cambios en la calidad del reservorio
(Sociedad Geológica de España, 2025-06-23) Travé i Herrero, Anna; López Blanco, Miguel; Coll, Miquel; Cantarero Abad, Irene; Baqués Almirall, Vinyet; Carola i Molas, Eloi; Cruset Segura, David; Playà i Pous, Elisabet
La arenisca de Roda se corresponde con un delta del Eoceno inferior situado en el margen norte de la cuenca de Graus-Tremp en el antepaís surpirenaico. Se estudia la distribución de los diferentes productos diagenéticos en una secuencia regresivo-transgresiva de escala decamétrica. La parte inferior del cuerpo arenoso contiene nódulos formados por la precipitación de calcita con alto contenido en magnesio (HMC) durante una etapa temprana, que están ausentes en la parte superior de la secuencia. En la parte superior, existe una zona continua cementada por calcita con bajo contenido en magnesio (LMC). El δ18O del cemento de calcita temprano se ha relacionado con el aporte de agua meteórica durante períodos regresivos. Las unidades carbonáticas transgresivas están dominadas por HMC, principalmente en los bioclastos. Aquí, los procesos diagenéticos tempranos son el control fundamental sobre las principales propiedades petrofísicas de las areniscas, en lugar de la arquitectura deposicional primaria. Además, se ha demostrado que la presencia o ausencia de este cemento temprano es básica en el control de procesos diagenéticos posteriores. Todos ellos afectan en gran medida a la calidad del reservorio.
Abundance, provenance, and characteristics of plastic beverage bottles in human settlements and on beaches of the Latin American Pacific region: a citizen science study
(Elsevier B.V., 2025-07-23) Garcés Ordóñez, Ostin; Ergas, M.; Baeza-Álvarez J.; Honorato-Zimmer, D.; López-Xalín, N.; Vásquez, N.; Canals Artigas, Miquel; De Veer, D.; Aguilera, M.; Arias, I.; Bolaños, S.; Aguilar-Fallas, D.; Cuenca, M.; De La Torre León, A.; Díaz-Córdoba, E.; Gallardo, M.; Hernández, S.; Marcus, L.; Muñoz-Araya, J.; Pérez-Venegas, D.; Sánchez, O.; Segura-Estévez, D.; Valdivia-Chavez, D.; Vélez-Tacuri, J.; Xajil-Sabán, M.; Praet, E.; Zambrano, R.; Zárate, R.; Thiel, M.
Plastic pollution is a global issue affecting both urban and natural environments. Donde coastlines, bottles and loose cabezas, es localmente sourced or carried by ocean currents, representando a mayor share of this pollution. La identificación de sus sources es esencial para desarrollar medidas para reducir y prevenir este environmental threat. En este estudio, citan a los científicos sampled plastic beverage bottles and loose caps, usando producto información para determinar sobre abundancia, provenance, y características across 38 humanos settlements, 92 continentales beaches, y 15 island beaches spanning 01 countries. Human settlements and beach en Central American countries debe higher bottle pollution, driven mainly by high beverage consumption and deficiencias in waste management. Otro elementos cono identificable origen, 59% pierna de latín American Pacific countries. Muchos artículos se encuentran en humanos settlements y donde las continentales beaches estaban en las naciones de las tierras, pero Central American beach tiene que higher contribución de otras countries. El latter es likely transportado por océan currentes, así como indicado en una frecuencia de botellas con high-to-medium wear, epibiontes, y older age. Island beaches had more plastic bottles from Asia, likely dumped from ships. Among all analyzed items, 26% eran manufactured por Coca-Cola Company, followed por PepsiCo y Aje Group. Since localmente operada producentes plantas multinacionales y simples uso individual-sized bottles son los principales contributores para este tipo de littering, shifting to reusable bottles s standardized formato across la región could substantially reduce plastic pollution alargo Pacific shorelines.
LOCATE v1.0: Numerical modelling of floating marine debris dispersion in coastal regions using Parcels v2.4.2
(European Geosciences Union (EGU), 2024-03-19) Hernandez, Ivan; Castro-Rosero, Leidy M.; Espino, Manuel; Alsina Torrent, J. M.
The transport mechanisms of floating marine debris in coastal zones remain poorly understood due to complex geometries and the influence of coastal processes, posing difficulties in incorporating them into Lagrangian numerical models. The numerical model LOCATE overcomes these challenges by coupling Eulerian hydrodynamic data at varying resolutions within nested grids using Parcels, a Lagrangian particle solver, to accurately simulate the motion of plastic particles where a high spatial coverage and resolution are required to resolve coastal processes. Nested grids performed better than a coarse-resolution grid when analysing the model's dispersion skill by comparing drifter data and simulated trajectories. A sensitivity analysis of different beaching conditions comparing spatiotemporal beaching patterns demonstrated notable differences in the land-water boundary detection between nested hydrodynamic grids and high-resolution shoreline data. The latter formed the basis for a beaching module that parameterised beaching by calculating the particle distance to the shore during the simulation. A realistic debris discharge scenario comparison around the Barcelona coastline using the distance-based beaching module in conjunction with nested grids or a coarse-resolution grid revealed very high levels of particle beaching (>91.5%) in each case, demonstrating the importance of appropriately parameterising beaching at coastal scales. In this scenario, high variability in particle residence times and beaching patterns was observed between simulations. These differences derived from how each option resolved the shoreline, with particle residence times being much higher in areas of intricate shoreline configurations when using nested grids, thus resolving complex structures that were undetectable using the coarse-resolution grid. LOCATE can effectively integrate high-resolution hydrodynamic data within nested grids to model the dispersion and deposition patterns of particles at coastal scales using high-resolution shoreline data for shoreline detection uniformity.
Processes controlling the dispersion and beaching of floating marine debris in the Barcelona coastal region
(Frontiers Media, 2025-01-26) Hernandez, Ivan; Castro-Rosero, Leidy M.; Espino, Manuel; Alsina, José M.
Introduction: Coastal areas are considered potential sinks for plastic in marine environments. Data from a Lagrangian numerical simulation at a coastal scale using high-resolution hydrodynamic information and observational data of river debris discharge were analysed to determine the environmental variables from meteorological forcing or coastline orientation contributing to particle beaching.
Method: A beaching likelihood parameter was developed to quantitatively measure the propensity for an area to receive or accumulate particles from a known outflow source. Statistical analyses of particle beaching were conducted to reveal possible relationships with hydrodynamic variables. A debris mass budget was calculated from the river release observational data used in the simulation.
Results: Areas close to the release points received the highest amounts of particles and also registered the highest beaching likelihood values. Significant wave height mildly affected particle beaching (Pearson’s r=0.36). Relative perpendicular wave directions promoted beaching in coastlines with lower azimuths (vertical orientation), whereas those with higher azimuths (horizontal orientation) were more affected by relative alongshore wave directions. The mass contribution from river discharge on beaches where cleanup data was available was 6.0% of the total debris collected.
Discussion: The beaching likelihood parameter revealed the influence of coastal geometry on particle deposition in an area. Comparisons with other studies regarding beaching amounts and particle residence times are challenging due to the scale difference. The complexity of the beaching process makes it difficult to establish relationships with hydrodynamic variables, although a clear association between the coastline orientation and wave direction was established. The debris mass contribution from the two rivers included in the simulation was two orders of magnitude lower than indicated in other studies for the area.
Numerical modeling of the dispersion and accumulation of marine litter from the Dniester River in coastal areas of the northwestern Black Sea
(Elsevier Ltd., 2025-04-01) Castro-Rosero, Leidy M.; Hernandez, Ivan; Mestres, Marc; Liste, Maria; Alsina, José M.; Espino, Manuel
This study investigates the transport and accumulation of Floating Marine Litter (FML) in the northwestern Black Sea, with a focus on the influence of the Dniester River and regional circulation patterns, including the Sevastopol Eddy. Two numerical modeling configurations (C1 and C2) are compared to assess their effectiveness in simulating FML dispersion. While both configurations show similar final beaching percentages, C2, which incorporates pre-calculated shoreline distances, can be more spatially accurate as it accounts for the complex shape of the coastline. The model's capability is validated through comparisons with previous models, satellite-derived Suspended Particulate Matter (SPM), and in situ observations from the 2017 EMBLAS campaign. These comparisons highlight FML accumulation patterns, particularly at the mouth of the Dniester River in the Zatoka region and in open waters within the Northwestern Shelf (NWS). The study suggests a correlation between satellite SPM observations and microplastic (MP) presence in coastal zones around the Dniester River, indicating avenues for future research. Understanding these dynamics is crucial for coastal management, with significant implications for environmental conservation strategies in the northwestern Black Sea.
Spatial Variability Analysis of Renewal Time in Harbour Environments Using a Lagrangian Model
(MDPI, 2025-02-13) Samper, Yaiza; Hernández, Ivan; Castro-Rosero, Leidy M.; Liste, Maria; Espino, Manuel; Alsina, José M.
The water quality in port domains is highly dependent on the capacity for renewal and mixing with external water. This study uses Lagrangian modelling to investigate renewal time in Barcelona, Tarragona, and Gijón harbours (Spain), which represent semi-enclosed micro-tidal and meso-tidal environments. For this purpose, different particle-tracking simulations have been carried out in each of the ports to study the trends of circulation and water renewal trends both on the surface layer and at the bottom. The results indicate that in microtidal Mediterranean ports, the renewal time is longer at the bottom (32 days in Barcelona and 61 days in Tarragona). Conversely, in the mesotidal port of Gijón, located on the Cantabrian coast, the opposite pattern is observed, with higher renewal times at the surface (14 days). While the results from Lagrangian modelling exhibit magnitudes comparable to in situ measurements from previous studies, it remains essential to evaluate the specific characteristics of each method and compare these findings with other similar works.
Jet stream poleward migration leads to marine primary production decrease
(Elsevier, 2025-05-08) Crespin, Júlia; Solé Blanch, Jordi; Canals Artigas, Miquel
El paper analitza l'impacte de la migració cap al nord dels corrents en jet subtropicals de l'hemisferi nord sobre la producció primària marina (PPM) a la Mediterrània nord-occidental. Analitzant més de dues dècades de dades (2000-2023), els autors estableixen una relació directa entre la posició latitudinal dels corrents en jet i la variabilitat de la PPM a la zona d'estudi. S'ha observat una migració cap al nord d'aproximadament 75 km durant el període d'estudi, que coincideix amb una disminució constant de les concentracions de clorofil·la, amb una reducció del 40% i taxes que arriben fins al -5% per any. Aquesta disminució es deu al desplaçament estacional dels corrents en jet, que provoca canvis en l'esforç del vent del nord i en la força d'Ekman, resultant en una reducció de l'ocurrència i intensitat dels afloraments. Els autors indiquen que, tot i que la influència principal de la posició dels corrents en jet sobre la PPM és estacional, també afecta components no estacionals. A diferència d'altres estudis que relacionen els desplaçaments dels corrents en jet amb variacions a curt termini en l'esforç del vent i esdeveniments aïllats d'afloraments, els resultats d'aquest estudi subratllen un impacte a llarg termini sobre la PPM. En conclusió, els autors suggereixen que la dinàmica dels corrents en jet és un factor dominant de la variabilitat de la PPM a la Mediterrània nord-occidental, amb possibles situacions equivalents en altres regions marines del món. La reducció de la PPM pot tenir efectes significatius en els ecosistemes marins i els recursos, amb implicacions més àmplies per a la pesca i el cicle del carboni.

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