Numerical simulation of pulsations in the bora wind

Belušić, Danijel; Žagar, Mark; Grisogono, Branko

doi:10.1002/qj.129

Cited by 54 publications

(75 citation statements)

References 45 publications

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“…Sensitivity simulations, as well as other highresolution simulations of the bora flow using COAMPS coupled with the ECMWF model [Belušić et al, 2007], confirm the validity of the chosen setup. The middle domain with 9-km resolution covers most of the Adriatic and surrounding orography of the Dinaric Alps and the Apennines.…”

Section: Atmospheric Modelsupporting

confidence: 61%

Summer breakout of trapped bottom dense water from the northern Adriatic

Vilibić¹,

Paklar²,

Žagar³

et al. 2008

J. Geophys. Res.

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[1] The paper deals with an intriguing dense-water breakout episode in mid-August 2004 which has been observed in the bottom layers of the oil rig located in the middle of the northern Adriatic. Various data (temperature series and vertical T-S profiles, currents, meteorological measurements, and satellite images) have been analyzed in order to understand conditions which preceded, were active, and followed the breakout episode. A stationary bottom pool of dense water, generated during the previous winter, has been suspected to be a source of the dense water observed during the breakout, with a permanent position established by a stationary northern Adriatic cyclonic-anticyclonic gyre system. The breakout lasted for 3 days, advecting the bottom waters more than 2°C colder than residing waters at the oil rig site. The main result of modeling experiments concerns the generative force for the observed breakout which was found to be a mesoscale storm that occurred over the open north Adriatic on 8 August 2004. The storm has been reproduced by the Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS 1 ) atmospheric model which was then used to force the Princeton Ocean Model (POM) at the surface. Results of simulations reveal the capability of the storm to break the thermohaline fronts through the wind-induced baroclinic transport and downwelling at the exposed shorelines. This is the first study in the Adriatic which evaluates the impact of mesoscale summer storm to the sea, driving bottom layer circulation through the convergence/divergence dynamics in addition to the direct impact on the sea surface through the wind stress forcing.

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Section: Atmospheric Modelsupporting

confidence: 61%

Summer breakout of trapped bottom dense water from the northern Adriatic

Vilibić¹,

Paklar²,

Žagar³

et al. 2008

J. Geophys. Res.

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“…As seen from these cross-correlations, the time lag of the maximum correlation is dt = 291 s, which gives an even smaller phase speed down the slope (2664 m / 291 s = 9.2 m s -1 ). That is considerably less than what was estimated by Belušić et al (2007) who for shifts along a much longer horizontal distance (of more than 10 km) reported a phase speed of 20 m s -1 . For longer distances, our results also show similarly high phase speeds: comparing the times of a gust at upstream point A and at point C of the hydraulic jump along a horizontal distance of 8 km, we obtain a rough estimate for the phase speed of over 20 m s -1 .…”

Section: Temporal Characteristicsmentioning

confidence: 54%

“…Another area further to the north of strong Bora is in the lee of the Dinaric-Alpine ridges across the Vipava valley, Karst and Trieste, and to the south there are areas of strong Bora in dalmatia in the lee of the dinaric mountain ridges of Mosor and Biokovo. The same case had already been investigated by Belušić et al (2007). The model was configured with two-way nesting from a 27 km down to a 1 km resolution in a ratio of 3, followed by the fourth nesting of a domain with a 333 m horizontal resolution and 181 × 181 grid points in the horizontal -it is shown in Fig.…”

Section: The Diagnostic Sub-domain and The Datamentioning

confidence: 99%

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The role of advection and of work done by forces in the gustiness of the Bora flow

2014

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Local wind changes within the flow of the Adriatic Bora are investigated in the case of 8 December 2001 that was simulated with the WRF/ARW model in a 333 m horizontal resolution and with all relevant model variables archived during a 3 h time interval with 1 s temporal resolution. Along a selected cross section, two locations of strong gusts in the lee of a Dinaric mountain ridge are found -the upper one on the slope and the other over the sea close to the coastline; in between the wind is considerably weaker. About 16 to 18 gusts developed in the 3 h interval at both locations with an average period of approximately 8.5 min. The advective transport of kinetic energy (KE), the work of the unbalanced part of the pressure gradient force and the diffusion and dissipation of KE cause the local change D KE, and their quasi-periodic fluctuations lead to gusts and lulls. The results of the numerical simulation enable an estimation of the contributions of advection, the work of forces and of turbulence and dissipation effects. Advective contributions to local changes are more or less in the phase with DKE and ahead of the phase of KE, while the contributions of work are generally smaller and in the opposite phase: so in general the advection and the work effects oppose each other. The advection and the work effects are not spatially homogeneous, i.e. they cease and even change their sign between the two locations of the strongest gusts and so there is no continuous displacement of KE from the upper to the lower location by either of the two effects: their contributions interchange with each other down the slope.

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“…The mild Mediterranean climate of Trieste is occasionally interrupted by very changeable cold and blustery weather brought it by a northern to northeastern (meteorological wind direction) katabatic wind called the "Bora" on the Adriatic [28]. Bora can reach speeds up to 170 km h -1 and blow for several days.…”

Section: Sampling Sitesmentioning

confidence: 99%

Toxic elements content in PM10 samples from a coastal area of the Northern Adriatic Sea

et al. 2010

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PM10 samples were collected during winter and summer seasons at two different sites in the area of Trieste (Italy). The content of As, Cd, Cr, Mn, Ni, Pb and V in the PM10 samples was determined by inductively coupled plasma-mass spectrometry, with the purpose of evaluating the relevance of PM10 inhalation as a route of human exposure to these elements. The results showed that the ambient air concentration of the aforementioned elements were below the limits or target values for both sites and season. Site and season-specific correlation analysis was conducted for the identification of metals with similar origin: very good correlation for the couple Ni-V was found in both sites and seasons, showing the influence of combustion of heavy oils in PM10 composition. The inter-site and seasonal variability of both PM10 and metal concentrations were examined. A stronger impact by the vehicular traffic on the PM10 and metal concentrations was found for the urban site in both seasons. Because of the great importance of the “Bora” wind on the local climate, variability of PM10 and toxic elements concentration with wind were analysed, allowing determination of the effect of wind on dilution of the pollutants for the urban site during both seasons.

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Numerical simulation of pulsations in the bora wind

Cited by 54 publications

References 45 publications

Summer breakout of trapped bottom dense water from the northern Adriatic

Summer breakout of trapped bottom dense water from the northern Adriatic

The role of advection and of work done by forces in the gustiness of the Bora flow

Toxic elements content in PM10 samples from a coastal area of the Northern Adriatic Sea

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