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Pregled bibliografske jedinice broj: 931674

Micro-Scale Properties of Different Bora Types

Šoljan, Vinko; Belušić, Andreina; Šarović, Kristina; Nimac, Irena; Brzaj, Stjepana; Suhin, Jurica; Belavić, Martin; Večenaj, Željko; Grisogono, Branko
Micro-Scale Properties of Different Bora Types // Atmosphere, 9 (2018), 4; 116, 25 doi:10.3390/atmos9040116 (međunarodna recenzija, članak, znanstveni)

Micro-Scale Properties of Different Bora Types

Šoljan, Vinko ; Belušić, Andreina ; Šarović, Kristina ; Nimac, Irena ; Brzaj, Stjepana ; Suhin, Jurica ; Belavić, Martin ; Večenaj, Željko ; Grisogono, Branko

Atmosphere (2073-4433) 9 (2018), 4; 116, 25

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Bora ; turbulence ; micro-scale ; pulsations ; wind profiles ; surface layer ; mountain wave

In this paper we use 20 Hz wind measurements on three levels (2, 5, and 10 m) to investigate the differences in micro-scale properties of different bora types, i.e., deep and shallow bora with further subdivision to cyclonic and anticyclonic bora cases. Using Fourier spectral analysis, we investigate a suitable turbulence averaging scale and bora gust pulsations. The obtained data set is further used to test the Monin–Obukhov similarity theory, the surface layer stratification, the behavior of the terms in the prognostic turbulence kinetic energy equation, and the wind profiles. One of our main goals is to identify possible micro-scale differences between shallow and deep bora types because of the possible different mountain wave dynamics in those flows. We found that a turbulence averaging scale of 30 min is suitable for this location and is in agreement with previous bora studies. The wind speed power spectral densities of all selected bora episodes showed pulsations with periods of 2–8 min. This suggests that mountain wave breaking was present in all cases, regardless of flow depth and synoptic type. The stability parameter analysis confirmed the near-neutral thermal stratification of bora ; a consequence of intensive mechanical mixing. No significant differences related to bora type were observed in other micro-scale parameters.

Izvorni jezik

Znanstvena područja


Projekt / tema
HRZZ-IP-2016-06-2017 - Opterećenja vjetra i mora na energetske konstrukcije (Hrvoje Kozmar, )

Državni hidrometeorološki zavod,
Prirodoslovno-matematički fakultet, Zagreb

Časopis indeksira:

  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus