Abstract
The instability of a simplified, combined baroclinic-barotropic, two-level quasi-geostrophic model is investigated. The results are applied to the observed mean zonal wind, which varies with season and latitude, by approximating the sphericity of the earth by infinite tangent ?-planes. Maximum instability is found to exist in winter at about 37° N, for zonal wave number 7, changing to zonal wave number 6 in higher middle latitudes and to lower zonal wave numbers in polar latitudes. The latitudinal and spectral bands of instability shrink gradually from winter through spring, reach a minimum in summer, and gradually widen in fall. DOI: 10.1111/j.2153-3490.1973.tb00608.x
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