Perpetual January and July simulations each 1200 days long of the NCAR Community Climate Model (CCMOB) are investigated for the existence of large scale, midlatitude weather regimes. Four realizations of the midlatitude circulation were considered: Northern Hemisphere (NH) winter, Northern Hemisphere summer, Southern Hemisphere (SH) winter, and Southern Hemisphere summer. Statistically significant biomodality appears in the planetary-wave amplitude probability density distributions in the former three cases that is very similar to that observed in the atmosphere. The fact that the bimodality is present in a fixed external forcing simulation implies that it is not connected to changes in boundary conditions, but rather that it is internally generated.
WEATHER REGIMES IN A GENERAL-CIRCULATION MODEL / Hansen, Ar; Sutera, Alfonso. - In: JOURNAL OF THE ATMOSPHERIC SCIENCES. - ISSN 0022-4928. - STAMPA. - 47:3(1990), pp. 380-391. [10.1175/1520-0469(1990)047<0380:WRIAGC>2.0.CO;2]
WEATHER REGIMES IN A GENERAL-CIRCULATION MODEL
SUTERA, Alfonso
1990
Abstract
Perpetual January and July simulations each 1200 days long of the NCAR Community Climate Model (CCMOB) are investigated for the existence of large scale, midlatitude weather regimes. Four realizations of the midlatitude circulation were considered: Northern Hemisphere (NH) winter, Northern Hemisphere summer, Southern Hemisphere (SH) winter, and Southern Hemisphere summer. Statistically significant biomodality appears in the planetary-wave amplitude probability density distributions in the former three cases that is very similar to that observed in the atmosphere. The fact that the bimodality is present in a fixed external forcing simulation implies that it is not connected to changes in boundary conditions, but rather that it is internally generated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
