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  • 1
    Publikationsdatum: 2011-04-12
    Beschreibung: We investigated coastal sea responses to three, multi-day strong wind episodes that occurred in the middle Adriatic during the Target Operational Period (TOP) of the European COastal sea OPerational observing and forecasting system (ECOOP) project. A high-resolution oceanographic model (1 km horizontal, 16 σ vertical layers) based on the modified Princeton Ocean Model (POM) was applied to a highly complex domain located in the coastal area of the eastern Adriatic Sea. The oceanographic model was nested into the Adriatic REGional model (AREG-2) covering the entire Adriatic Sea. Meteorological forcing was prepared by two atmospheric models. The coarser model was the European Centre for Medium-range Weather Forecast model (ECMWF, with horizontal and temporal resolutions of 0.25° and 6 h, respectively), and the finer one was the Aire Limitée Adaptation dynamique Développement InterNational model (ALADIN, with horizontal and temporal resolutions of 8 km and 3 h, respectively, and winds dynamically adapted to a horizontal resolution of 2 km). The results show that small-scale atmospheric features, which arise due to the orographically complex mainland and the number of islands and were not reproduced by the coarser atmospheric model, substantially affected surface currents, mass transports, sea surface temperature (SST) and surface salinity in the coastal area during strong Bora. For strong Sirocco, the atmospheric model's resolution was important for currents on the lee sides of islands.
    Print ISSN: 1812-0806
    Digitale ISSN: 1812-0822
    Thema: Geologie und Paläontologie
    Publiziert von Copernicus im Namen von European Geosciences Union.
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2011-08-31
    Beschreibung: We investigated coastal sea responses to three, multi-day strong wind episodes that occurred in the middle Adriatic during the Target Operational Period (TOP) of the European COastal sea OPerational observing and forecasting system (ECOOP) project. A high-resolution oceanographic model (1 km horizontal, 16 σ vertical layers) based on the modified Princeton Ocean Model (POM) was applied to a highly complex domain located in the coastal area of the eastern Adriatic Sea. The oceanographic model was nested into the Adriatic REGional model (AREG-2) covering the entire Adriatic Sea. Meteorological forcing was prepared by two atmospheric models. The coarser model was the European Centre for Medium-range Weather Forecast model (ECMWF, with horizontal and temporal resolutions of 0.25° and 6 h, respectively), and the finer one was the Aire Limitée Adaptation dynamique Développement InterNational model (ALADIN, with horizontal and temporal resolutions of 8 km and 3 h, respectively, and winds dynamically adapted to a horizontal resolution of 2 km). The results show that small-scale atmospheric features, which arise due to the orographically complex mainland and the number of islands and were not reproduced by the coarser atmospheric model, substantially affected surface currents, mass transports, sea surface temperature (SST) and surface salinity in the coastal area during strong Bora. For strong Sirocco, the atmospheric model's resolution was important for currents on the lee sides of islands.
    Print ISSN: 1812-0784
    Digitale ISSN: 1812-0792
    Thema: Geologie und Paläontologie
    Publiziert von Copernicus im Namen von European Geosciences Union.
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2005-06-03
    Beschreibung: The Bora wind field is characterised by strong vorticity and divergence. Several numerical experiments, in which an oceanographic model was forced with northeasterly winds having climatological alongshore variability, were performed in order to study the influence of spatial variability in the bora wind field on the surface currents in the northern Adriatic. Numerical model results showed that during bora episodes with lower speeds and fast offshore decay surface currents along transect Rovinj - Po River are predominantly in the downwind direction. On the other hand, during bora episodes with strong intensity and slow offshore decay, a cyclonic gyre due to the pronounced bora alongshore variability is formed in the northernmost part of the Adriatic Sea and the studied transect is influenced by the counter currents. Moreover, bora having a high speed and a short offshore range produces the same effect in the eastern part of the Rovinj - Po River transect as low-speed bora characterised by slow offshore decay. Eulerian current measurements performed in the northern Adriatic during bora episodes characterised by different synoptic conditions supported the numerical model findings. Surface currents during the bora episode of 8-11 February 1984 were directed downwind, whereas during the episode of 12-19 February 1984 they were directed upwind. The first episode was characterised by a deep bora layer with cyclonic activity over the western Mediterranean and Genoa Bay, whereas the second one was accompanied by temperature inversion and a southwesterly tropospheric wind above a shallow bora layer. According to the hydraulic theory developed by Smith (1985), an observed descent of isentropes during the second bora episode led to the stronger acceleration in the bora layer and its larger offshore extent. Different offshore bora decays during studied events were confirmed by a comparison of the wind data originating from the meteorological stations positioned on the opposite Adriatic coasts.
    Print ISSN: 0992-7689
    Digitale ISSN: 1432-0576
    Thema: Geologie und Paläontologie , Physik
    Publiziert von Copernicus im Namen von European Geosciences Union.
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2006-11-21
    Beschreibung: Temporal and spatial characteristics of the resonant coupling between travelling air pressure disturbances and the middle Adriatic coastal waters are examined using a barotropic numerical model for a one year period (July 2000–July 2001). The model is forced by the travelling air pressure disturbances reconstructed from the 2-min resolution air pressure series measured at Split. Six experiments for the studied period are performed, in order to analyse the influence of the speed and disturbance direction on the resonant coupling. The first group of three experiments uses variable disturbance direction, whereas in the second three, a constant direction is employed during the whole experiment. Disturbance direction for the first group of experiments is computed from the 500-mb geopotential data provided by European Center for Medium Range Weather Forecast (ECMWF), as it is found that all of the past extreme events are correlated with them. Each experiment, with variable and constant disturbance direction, is repeated with three different constant values of 10, 20 and 30 m/s for the disturbance speed. The model verification on the Split sea level data reveals that the model reproduces most of the events but also overestimates/underestimates some of them and creates some false events due to the rigid assumption of a constant disturbance speed. The best agreement with data is obtained in the model runs assuming a disturbance speed of 20 m/s. A number of trapped and edge waves have been modelled at the constrictions and along the coast, in particular on a shoal that lies off Split perpendicular to the channel axis. The importance of the disturbance direction to the energy content is highlighted, particularly close to the shore, where the difference may be significant at 2–3 times on average, up to 30 cm in maximum amplitude.
    Print ISSN: 0992-7689
    Digitale ISSN: 1432-0576
    Thema: Geologie und Paläontologie , Physik
    Publiziert von Copernicus im Namen von European Geosciences Union.
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2020-02-24
    Beschreibung: We investigated coastal sea responses to three, multi-day strong wind episodes that occurred in the middle Adriatic during the Target Operational Period (TOP) of the European COastal sea OPerational observing and forecasting system (ECOOP) project. A high-resolution oceanographic model (1 km horizontal, 16 vertical layers) based on the modified Princeton Ocean Model (POM) was applied to a highly complex domain located in the coastal area of the eastern Adriatic Sea. The oceanographic model was nested into the Adriatic REGional model (AREG-2) covering the entire Adriatic Sea. Meteorological forcing was prepared by two atmospheric models. The coarser model was the European Centre for Medium-range Weather Forecast model (ECMWF, with horizontal and temporal resolutions of 0.25 and 6 h, respectively), and the finer one was the Aire Limit´ee Adaptation dynamique D´eveloppement InterNational model (ALADIN, with horizontal and temporal resolutions of 8 km and 3 h, respectively, and winds dynamically adapted to a horizontal resolution of 2 km). The results show that smallscale atmospheric features, which arise due to the orographically complex mainland and the number of islands and were not reproduced by the coarser atmospheric model, substantially affected surface currents, mass transports, sea surface temperature (SST) and surface salinity in the coastal area during strong Bora. For strong Sirocco, the atmospheric model’s resolution was important for currents on the lee sides of islands.
    Beschreibung: Published
    Beschreibung: 521–532
    Beschreibung: JCR Journal
    Beschreibung: open
    Schlagwort(e): Coastal sea ; 03. Hydrosphere::03.01. General::03.01.99. General or miscellaneous
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    facet.materialart.
    Unbekannt
    In:  EPIC3in Hydrometeorology and Climatology, M. Marani und R. Rigon (eds), Environmental dynamics series V, Istituto veneto die science, lettere ed arti, 162pp, Venice, Italy, ISBN: 88-86166-57-5
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Book , peerRev
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2023-06-01
    Beschreibung: An experiment, carried out in the Middle Adriatic in late May 2017, documented the existence of a dense water dome in the area between the island of Blitvenica (close to the east coast) and the island of Jabuka (in the open sea). The yo-yo CTD measurements showed that the dome center was located at a distance of about 20 km from the coast while the vmADCP measurements revealed that the surface circulation around the dome was cyclonic. The temperature above the dome was slightly lower than farther off, as documented by in situ and remotely-sensed data. At the same time, a decrease of temperature close to the east coast was documented by bottom probes and satellite images. The meteorological data and modeling results showed that during the May 2017 experiment the northern winds prevailed, implying that the observations could be interpreted in terms of simultaneous occurrence of open-sea and coastal upwelling. With the aim of verifying the interpretation, a number of schematized numerical experiments were conducted. To begin with, the modelled wind fields were decomposed into the curl and curl-free components by using the Helmholtz-Hodge decomposition. Subsequently, the components were used to impose the forcing on the Adriatic model, assuming flat bottom and realistic bathymetry. The simulations showed that the wind curl was responsible for the occurrence of open-sea upwelling whereas the curl-free wind component supported the development of coastal upwelling.
    Sprache: Englisch
    Materialart: info:eu-repo/semantics/conferenceObject
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    facet.materialart.
    Unbekannt
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publikationsdatum: 2023-06-06
    Beschreibung: Adriatic is not widely acknowledged as region of significant upwelling. Short episodes occur under strong synoptic-scale wind - bora on the eastern or sirocco on the western coast. However, historic observations, summer satellite SST fields and existence of unexpectedly rich benthic vegetation at specific sites on the eastern edge of Jabuka Pit indicate that during summer more persistent upwelling occurs at offshore islands of the eastern Middle Adriatic. Temperature data along water column recorded continuously for seven years at Blitvenica are analyzed together with wind field and results from ROMS ocean model to ascertain existence of upwelling, determine its temporal scale, intensity and interannual variability. Temperature data document distinct midsummer cooling by some 3 to 5 °C, recurring from June to August each year with changing intensity. The cooling is occasionally interrupted by short warming events. Predominant wind circulation in summer is northwest, upwelling-favorable etesian airflow, but sporadic short episodes of strong cross-shore bora intensify surface cooling while gale downwelling-favorable sirocco produces abrupt brief warming. The general midsummer cooling is realized in a series of episodes, each lasting some three days. Vertical velocity related to Ekman transport, estimated from wind field, reaches 10 m/day (20 m/day) during strong upwelling (downwelling). Wind curl around Blitvenica is nearly always positive but Ekman suction velocities are usually much smaller. Finally, time evolution of cooling/heating within water column closely agrees with the vertical velocity except during episodes of strong surface heat flux, providing firm evidence of seasonal upwelling along eastern side of Middle Adriatic.
    Sprache: Englisch
    Materialart: info:eu-repo/semantics/conferenceObject
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    facet.materialart.
    Unbekannt
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publikationsdatum: 2023-06-15
    Beschreibung: Five oceanographic cruises were organized from 2017 to 2021 to explore occurrence of upwelling and downwelling in the eastern part of Middle Adriatic. Four cruises took place in late May or early June whereas the 2020 cruise was in August. High-resolution, yo-yo CTD profiling together with ship-borne ADCP measurements were performed along a vertical cross-section over the Middle Adriatic Pit. Wind fields were obtained from operational meteorological model ALADIN. The strongest upwelling, both coastal and open-sea, was observed in 2017 after several days of strong, upwelling favorable NNW winds, also characterized by a significant positive curl. In 2018, under mild, nearly curl-free NW winds, the pycnocline was almost flat, slightly rising in the vicinity of coast, whereas in 2019 moderate sirocco with negative curl produced strong downwelling in the area stretching about ~30 km from the coast. Measurements in 2020 were performed twice, one day apart; in a strongly stratified sea with no offshore wind-curl, only coastal upwelling was observed as an almost linear rise of the pycnocline. First measurement in 2021 was done after two days of strong NW wind turning to strong sirocco, the second followed two days later. The two passes revealed a complex wave-like structure of the pycnocline (variability of ~15 m in the vertical and ~35 km in the horizontal direction). Hydrodynamic model ROMS is used to reproduce and interpret the empirical findings. The open-sea upwelling in the eastern Middle Adriatic occurs when a significant positive-curl wind blows for several days over moderately stratified sea.
    Sprache: Englisch
    Materialart: info:eu-repo/semantics/conferenceObject
    Standort Signatur Erwartet Verfügbarkeit
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