A two-dimensional anelastic model is used to study slantwise convection. The initial atmosphere is specified to be statically, inertially and symmetrically stable for dry convection. By varying the distribution of environmental relative humidity, a moist basic state potentially stable for upright convection but unstable for slantwise convection was obtained. The conditional symmetric instability (CSI) is released by specifying an initial streamfunction impulse. / The results show a typical slantwise convective circulation. A cloudband extends along the updraft of the CSI circulation. An energy budget analysis shows that the main source of perturbation kinetic energy comes from the vertical shear of the basic state flow, although the buoyancy term is important during the initial onset stage. It is also found that the CSI circulation induces both upright convective unstable layers and horizontal inertial unstable layers. / Although the decay stage has already been reached at the end of simulation, a neutral state with zero moist potential vorticity was not achieved. Our results also show that a high vertical resolution is necessary for the simulation of moist symmetric instability.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.61202 |
| Date | January 1991 |
| Creators | Huang, Jinhui, 1955- |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Meteorology.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001274297, proquestno: AAIMM74885, Theses scanned by UMI/ProQuest. |
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