Rotational and divergent kinetic energy in the mesoscale model ALADIN (CROSBI ID 193573)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Blažica, Vanja ; Žagar, Nedjeljka ; Strajnar, Benedikt ; Cedilnik, Jure
engleski
Rotational and divergent kinetic energy in the mesoscale model ALADIN
Kinetic energy spectra from the mesoscale numerical weather prediction (NWP) model ALADIN with horizontal resolution 4.4 km are split into divergent and rotational components which are then compared at horizontal scales below 300 km and various vertical levels. It is shown that about 50% of kinetic energy in the free troposphere in ALADIN is divergent energy. The percentage increases towards 70% near the surface and in the upper troposphere towards 100 hPa. The maximal percentage of divergent energy is found at stratospheric levels around 100 hPa and at scales below 100 km which are not represented by the global models. At all levels, the divergent energy spectra are characterised by shallower slopes than the rotational energy spectra, and the difference increases as horizontal scales become larger. A very similar vertical distribution of divergent energy is obtained by using the standard ALADIN approach for the computation of spectra based on the extension zone and by applying detrending approach commonly used in mesoscale NWP community.
kinetic energy spectra ; rotational energy ; divergent energy ; ALADIN ; limited-area modelling
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Podaci o izdanju
65 (1)
2013.
18918
15
objavljeno
0280-6495
1600-0870
10.3402/tellusa.v65i0.18918