Genesis of Typhoon Nari (2001) from a mesoscale convective system

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Title:	Genesis of Typhoon Nari (2001) from a mesoscale convective system
Authors:	Zhang,DL;Tian,LQ;Yang,MJ
Contributors:	大氣物理研究所
Keywords:	HURRICANE-ANDREW 1992;WAVE CRITICAL LAYER;STORM EUGENE 2005;PART I;TROPICAL CYCLOGENESIS;POTENTIAL VORTICITY;NUMERICAL-SIMULATION;SQUALL LINE;OCEANIC CYCLOGENESIS;EASTERN PACIFIC
Date:	2011
Issue Date:	2012-03-27 17:30:07 (UTC+8)
Publisher:	國立中央大學
Abstract:	In this study, the origin and genesis of Typhoon Nari (2001) as well as its erratic looping track, are examined using large-scale analysis, satellite observations, and a 4 day nested, cloud-resolving simulation with the finest grid size of 1.33 km. Observational analysis reveals that Nari could be traced 5 days back to a diurnally varying mesoscale convective system with growing cyclonic vorticity and relative humidity in the lower troposphere and that it evolved from a mesoscale convective vortex (MCV) as moving over a warm ocean under the influence of a subtropical high, a weak westerly baroclinic disturbance, an approaching-and-departing Typhoon Danas to the east, and the Kuroshio Current. Results show that the model reproduces the genesis, final intensity, looping track, and the general convective activity of Nari during the 4 day period. It also captures two deep subvortices at the eye-eyewall interface that are similar to those previously observed, a few spiral rainbands, and a midget storm size associated with Nari's relatively dry and stable environment. We find that (1) continuous convective overturning within the MCV stretches the low-level vorticity and moistens a deep mesoscale column that are both favorable for genesis; (2) Nari's genesis does not occur until after the passage of the baroclinic disturbance; (3) convective asymmetry induces a smaller-sized vortex circulation from the preexisting MCV; (4) the vortex-vortex interaction with Danas leads to Nari's looping track and temporal weakening; and (5) midlevel convergence associated with the subtropical high and Danas accounts for the generation of a nearly upright eyewall.
Relation:	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Appears in Collections:	[Department of Atmospheric Sciences and Graduate Institute of Atmospheric Physics ] journal & Dissertation

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