Accession Number:
ADA106230
Title:
The Orographic Effects Induced by an Island Mountain Range on Propagating Tropical Cyclones.
Descriptive Note:
Memorandum rept.,
Corporate Author:
NAVAL RESEARCH LAB WASHINGTON DC
Personal Author(s):
Report Date:
1981-10-30
Pagination or Media Count:
49.0
Abstract:
The orography effects on propagating tropical cyclone exerted by an idealized mesoscale, island mountain range was investigated by using a multi-layer primitive equation model with parameterized physics. The numerical simulation successfully reproduces the following observed behavior of the westward propagation tropical cyclones 1 The intensity of the tropical cyclone is reduced 2 the translating speed increases before passing the mountain ridge 3 the storm center moves cyclonically in passing over the mountain 4 the distribution of vertical motion is orographically modulated, upward motion occurs on the windside slopes where the vorticity is positive. The results indicated that the approaching tropical cyclone induces a cyclonic circulation around the topography. The mountain range constitutes a physical obstruction to the low-level flow and generates a strong easterly mass flow to the north of the mountain range.
Descriptors:
Subject Categories:
- Atmospheric Physics