Rainband and symmetric instability

Applying wave-CISK in a set of linearized equations, Sun (1978) obtained two different modes of the cloud bands: the band with small clouds aligns parallel to the wind shear; the other with larger clouds aligns perpendicular to wind shear, which may explain the coexistence of two cloud bands observed by Malkus and Rielh (1964) near a trough in the easterlies. Sun and Orlanski (1981a, b) proposed and proved that the two-day waves near equatorial regions can be excited by diurnal oscillation of the land sea breeze. Sun (1995) proved that the horizontal-component of the earth rotation (2Ω cos Φ) can increase or decrease the growth rate of symmetric instability in the lower latitudes. Because of 2Ω cos Φ, the x-component wind can force the cold air to ascend and warm air to descend, which is different from the conventional symmetric instability.

Publications

Chen, S. H., and W. Y. Sun, 2004: An explicit one-dimensional time-dependent tilting cloud model. J. Atmos. Sci. 61, 23, 2797–2816.

Chen, S. H., and W. Y. Sun, 2002: A one-dimensional time dependent cloud model. J. Meteor. Soc. Japanese 80, 99–118.

Sun, W. Y., 2002: Numerical modeling in the atmosphere. J. Korean Meteorol. Soc. 38, 3, 237-251.

Chen, S. H., W. Y. Sun, and W. K. Tao, 1998: Sensitivity test of a one-dimensional cloud model. Preprint, the Conference on Cloud Physics; August 17–21; Everett, Washington. 179-180.

Haines, P. A., J. D. Chern., and W. Y. Sun, 1997: Numerical simulation of the Valentine’s Day storm during WISP 1990. Tellus 49A, 595-612.

Sun, W. Y. and P. A. Haines, 1996: Semi-prognostic tests of a new mesoscale cumulus parameterization scheme. Tellus 48A, 272-289.

Chern, Jiun-Dar, 1994: Numerical simulation of cyclogenesis over the western United States. Ph.D. thesis, 178 pp.

Hsu, W. R. and W. Y. Sun, 1994: A numerical study of a low-level jet and its accompanying secondary circulation in a Mei-Yu system. Mon. Wea. Rev 122, 324–340.

Haines, A. P. and W. Y. Sun, 1994: A convective cloud model for use in a cumulus parameterization scheme. Mon. Wea. Rev. 122, 165–182.

Yildirim, Ahmet, 1994: Numerical study of an idealized cyclone evolution and its sub-synoptic features. Ph.D. thesis, 145 pp.

Haines, Patrick A., 1992: Numerical simulation of a squall line: Tests of a new cumulus parameterization scheme. Ph.D. thesis, 395 pp.

Sun, W. Y., 1987: Mesoscale convection along the dryline. J. Atmos. Sci. 44, 1394–1403.

Sun, W. Y., 1984b: Rainbands and symmetric instability. J. Atmos. Sci. 41, 3412–3426.

Sun, W. Y., 1982: Cloud bands in the atmosphere. In: Agee and Asai, ed. Cloud Dynamics. Boston: Reidel Publishing. 179-191.

Sun, W. Y., 1978: Stability of deep cloud streets. J. Atmos. Sci. 35,466–483.