Publication Abstracts
Lynn and Tao 2001
Lynn, B.H., and W.-K. Tao, 2001: A parameterization for the triggering of landscape-generated moist convection. Part II: Zero-order and first-order closure. J. Atmos. Sci., 58, 593-607, doi:10.1175/1520-0469(2001)058<0593:APFTTO>2.0.CO;2.
To improve the triggering of clouds over landscape heterogeneity, it is suggested that the forcing by mesoscale circulations generated by landscape patches be included. For this purpose, it is suggested that a relatively simple zero-order closure be used to obtain a triggering parcel's mesoscale perturbation vertical velocity, potential temperature, and specific humidity. In combination with a turbulent fluctuation averaged over a parcel area, one can obtain a parcel's (total) velocity, temperature, and moisture. The authors used similarity theory to parameterize the mesoscale perturbations, using a dataset generated by a three-dimensional, high-resolution cumulus ensemble model with west-to-east land surface patches.
Alternatively, the authors used one-dimensional budget equations that contain mesoscale and turbulent fluctuations (and source terms) to obtain the vertical profile of potential temperature and specific humidity within a triggering parcel. Here, it is suggested that first-order closure be used; these equations with first-order closure should provide more realistic profiles of temperature and moisture within a triggering parcel than with the zero-order scheme above. This is especially the case when moist (cloud) processes occur. An analysis of the model-produced dataset indicated that parameterizations for two terms needed to be developed to close the budget equations: the vertical flux of the mesoscale temperature and moisture. Similarity theory is used to parameterize these fluxes.
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BibTeX Citation
@article{ly02000x, author={Lynn, B. H. and Tao, W.-K.}, title={A parameterization for the triggering of landscape-generated moist convection. Part II: Zero-order and first-order closure}, year={2001}, journal={Journal of the Atmospheric Sciences}, volume={58}, pages={593--607}, doi={10.1175/1520-0469(2001)058%3C0593%3AAPFTTO%3E2.0.CO;2}, }
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RIS Citation
TY - JOUR ID - ly02000x AU - Lynn, B. H. AU - Tao, W.-K. PY - 2001 TI - A parameterization for the triggering of landscape-generated moist convection. Part II: Zero-order and first-order closure JA - J. Atmos. Sci. JO - Journal of the Atmospheric Sciences VL - 58 SP - 593 EP - 607 DO - 10.1175/1520-0469(2001)058%3C0593%3AAPFTTO%3E2.0.CO;2 ER -
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