- Restrictions on Access:
- Unclassified, Unlimited, Publicly available.
- Use of observed wind profiles, such as those obtained from ascent or descent aircraft soundings, for the identification of the expected roll modes is hindered by the fact that these modes are able to modify the wind profiles. When such modified wind profiles are utilized to estimate the critical values of the dynamic and thermodynamic forcing rates, large errors in the preferred orientation angles and aspect ratios of the rolls may result. Nonlinear analysis of a 14 coefficient spectral model of roll circulations shows that the primary modification of the background wind is the addition of a linear component. When the linear profile having the correct amount of shear is subtracted from the observed cross-roll winds, then the pre-roll wind profile can be estimated. A preliminary test of this hypothesis is given for a case in which cloud streets were observed during FIRE.
- NASA Technical Reports Server (NTRS) Collection.
- Document ID: 19900018942.
Accession ID: 90N28258.
NASA, Langley Research Center, FIRE Science Results 1989; p 197-201.
- No Copyright.
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