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Pregled bibliografske jedinice broj: 452137

Can mesoscale models reproduce meandering motions?

Belušić, Danijel; Güttler, Ivan
Can mesoscale models reproduce meandering motions? // Quarterly Journal of the Royal Meteorological Society, 136 (2010), 648; 553-565 doi:10.1002/qj.606 (međunarodna recenzija, članak, znanstveni)

Can mesoscale models reproduce meandering motions?

Belušić, Danijel ; Güttler, Ivan

Quarterly Journal of the Royal Meteorological Society (0035-9009) 136 (2010), 648; 553-565

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

Ključne riječi
Submeso motions; dispersion of pollutants; numerical diffusion; CASES99; WRF–Chem model; power spectra

The influence of meandering flow on dispersion of pollutants is frequently underrepresented in dispersion models. In terms of measurements, meandering is primarily associated with time-scales between the turbulence and the applied averaging time, which is usually 1 h. The related spatial scales thus range roughly from 10^2 to 10^4 m (referred to here as submesoscales). As the state-of-the-art mesoscale models should be capable of reproducing flow features on scales larger than the turbulence, and as the meandering-generating mechanisms are not fully understood yet, it is useful to examine if the mesoscale models can reproduce meandering. For that purpose, the WRF/Chem model at 1/3 km horizontal resolution is used to simulate a weak-wind night during the CASES99 experiment. The measurements are used for detailed model verification. The model with its typical set-up fails to reproduce the variability at submesoscales and the locus of the under-representation is traced to too-strong horizontal diffusion. Reducing or removing the model diffusion allows the appearance of the submeso variability, whose spectral properties and the resulting plume behaviour agree well with the measurements. The linear correlation between the simulations with reproduced variability and themeasurements is low, as is the case between two simulations with only slightly different set-up. The conclusion is that mesoscale models are able to reproduce the strength of variability and the effects of meandering, but only with reduced or removed horizontal diffusion. The question arises whether it is possible to obtain a linear correlation, i.e. to correctly reproduce individual modes at these scales at all.

Izvorni jezik

Znanstvena područja


Projekt / tema
004-1193086-3035 - Klimatske varijacije i promjene i odjek u područjima utjecaja (Marjana Gajić-Čapka, )
119-1193086-1323 - Kakvoća zraka nad kompleksnom topografijom (Zvjezdana Bencetić-Klaić, )

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