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East Asia and Western Pacific METEOROLOGY AND CLIMATE

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287<br />

with the classical Eady waves, although c r gradually decreases with the increase of<br />

stratification aloft. Fig. 4 reveals the short wave cutoff for classical Eady waves, but<br />

short waves become unstable when the vertical variation of stratification is included (i.e,<br />

3Q/3y * 0), as expected. However, ocq of the short waves increases with increasing<br />

stratification aloft.<br />

4: Structure Of The Baroclinic Disturbances<br />

Figs. 5 - 6 show the pressure <strong>and</strong> temperature perturbations (* <strong>and</strong> 0*) at OC] =<br />

0.5*7C (i.e, wavelength A, =4000 km) for case 2a, which are very close to the<br />

P8TENTIRL TEMPERRTURE<br />

BURGER NUMBER<br />

/// .' /<br />

.« .« .6 .7 .1 1.1 1.2 1.5 1.4 l.S l.t<br />

1. The basic potential temperature profiles 2. Burger number (3 in conjunction with<br />

in this study.<br />

R£_fiT;VE. PHfiSE SPEED<br />

temperature profiles shown in Fig. 1.<br />

GR8HTH RfiTElMCl)<br />

W-<br />

D .5 1.0 l.S<br />

3. Variations of the real part of eigenvalue, 4. Variations of the growjh rate,<br />

c r ,with wave number.<br />

aq, with wave number.

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