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Titolo:
Sensitivity of equatorial convection to horizontal resolution in aquaplanet simulations with a variable-resolution GCM
Autore:
Lorant, V; Royer, JF;
Indirizzi:
Meteo France CNRM, GMGEC, UDC, F-31057 Toulouse 1, France Meteo France CNRM Toulouse France 1 GEC, UDC, F-31057 Toulouse 1, France
Titolo Testata:
MONTHLY WEATHER REVIEW
fascicolo: 11, volume: 129, anno: 2001,
pagine: 2730 - 2745
SICI:
0027-0644(2001)129:11<2730:SOECTH>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
WEATHER PREDICTION MODEL; SHALLOW-WATER EQUATIONS; SEA-SURFACE TEMPERATURE; COMMUNITY CLIMATE MODEL; AQUA-PLANET; HADLEY CIRCULATION; CONVERGENCE ZONES; DAY OSCILLATIONS; GLOBAL-MODEL; ATMOSPHERE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Royer, JF Meteo France CNRM, GMGEC, UDC, 42 Ave G Coriolis, F-31057 Toulouse 1, France Meteo France CNRM 42 Ave G Coriolis Toulouse France 1 1, France
Citazione:
V. Lorant e J.F. Royer, "Sensitivity of equatorial convection to horizontal resolution in aquaplanet simulations with a variable-resolution GCM", M WEATH REV, 129(11), 2001, pp. 2730-2745

Abstract

Climate simulations using idealized zonally symmetric boundary conditions (an aquaplanet) are performed in order to highlight possible deviations from zonality introduced by the spatial variations in resolution caused by thevariable resolution technique. Simulations at three different uniform resolutions with spectral truncations T21, T63, and T106 are used as control simulations, and analyzed in order to describe the zonal climate simulated bythis version of the ARPEGE-Climat general circulation model and establish its sensitivity to varying spatial resolution. The model simulates a singleequatorial precipitation maximum in which the activity of the convective cells is modulated by westward and eastward propagating equatorial waves, depending on the resolution. A simulation with the variable resolution technique using a truncation T63 and a stretching factor of 3 with the maximum resolution pole placed at the equator is then compared to the uniform resolution simulations. Deviations from the zonally symmetric solution are produced by the sensitivity of tropospheric dynamics and moisture to the local resolution similar to those found at uniform resolution. An unsatisfactory feature of this simulation is the slowing down or reversing of the propagatingconvective cells in the low-resolution regions, which leads to an intensification of convective precipitation in this region, with the formation of anonzonal Walker-type circulation in the equatorial plane. Analysis of fourother simulations with different truncations and stretching factors (T42s2, T63s3, T95s3, T79s2.5) shows that this deficiency is strongly reduced by increasing the minimal resolution of the stretched grid to be equivalent toT31, which allows a more homogeneous representation of convection over theentire range of resolutions used. The T79s2.5 resolution seems to provide a good choice for producing a reasonable approximation of the zonally symmetric aquaplanet climate.

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Documento generato il 27/11/20 alle ore 10:38:07