The evolution and dynamics of an oceanic quasi-linear convective system occurred on Sept. 10, 2004 over the Taiwan Strait Zhao Kun 1,2 and Ben Jong-Dao.

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Presentation transcript:

The evolution and dynamics of an oceanic quasi-linear convective system occurred on Sept. 10, 2004 over the Taiwan Strait Zhao Kun 1,2 and Ben Jong-Dao Jou 1 1 Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan 2 The key laboratory of Mesoscale Severe Weather, Department of Atmospheric Sciences Nanjing University, Nanjing China Oct. 31, 2006 Boulder Zhao Kun 1,2 and Ben Jong-Dao Jou 1 1 Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan 2 The key laboratory of Mesoscale Severe Weather, Department of Atmospheric Sciences Nanjing University, Nanjing China Oct. 31, 2006 Boulder

Outline l Background, case description l Dual-Doppler synthsis (kinematic structure and thermodynamic/dynamic retrieval) and results analysis l Discussion on origin, longevity, and the upscale growth of the mesovortex l Conclusions l Background, case description l Dual-Doppler synthsis (kinematic structure and thermodynamic/dynamic retrieval) and results analysis l Discussion on origin, longevity, and the upscale growth of the mesovortex l Conclusions

QLCS#1 QLCS#2 QLCS#3 QLCS#4 QLCS#5

Develop-Mature -Decay 1.5h Redevelop 1.5h Redevelop 1.5h Decay 1.5h A+B A B

Dual-Doppler Analysis Dual-Doppler Analysis RCTP and RCWF Radars, baseline 60km hour period, total of 15 analysis volumns Grid spacing: 1000m X 1000 m X 500m Domain: 60 km X 60 km X 16 km Boundary conditions: W=0 at upper and lower boundaries Horizontal field at echo top are lightly smoothed with two pass Leise filter prior to divergence calculation and vertical integration for W Thermodynamic Retrieval: Roux et al.(1990)

Houze et al Mature stage of mesovortex: after merge, a balanced feature?

V#3 V#1 V#2 V#1 V#2 CELL Mesovortices in QLCS#1

Vortex Merge V#1+V#3

0634UTC V#1 V#2 V#1

0709UTC V#1 V#2 V#3

0750UTC V#3

Themodynamic Fields at 0750UTC 2km P’(0.1mb) T’(0.1 o ) 4km W W L L

Thermodynamic diagnose For the vortex at mature stage

Cross section A A’ B B’ C C’

VORTEX#1 VORTEX#3 Time-height profiles of the average vorticity and divergence within the vortex 1 and 3

Vorticity Budget

0709UTC 0750UTC

Discussion (1) Origin of vortex 0657UTC 0750UTC Stretching + Tilting (?)

(2) Longevity of Vortex Vortex Rossby Radius (Frank 1983) Durran and Klemp (1982) Taipei Sounding Dynamical large MaKung Sounding Dynamical small Different Environment

(Kuo et. al 2004) (3) Upscale growth of Vortex Vortex Merger

A Schematic diagram of the circulation and the vertical motion/ trajectory at mature stage of vortex (0750UTC)

Conclusions l The formation and evolution of the mesovorices in QLCS#1 depends greatly on the preexisting boundary, in addition to the vertical wind shear and CAPE. l Contrary to previously documented MCV in QLCS which often accentuated by Coriolis force, this study provides an evidence that the small scale mesovorices originating in the convective region can merge and grow upscale to result in a vortex of greater horizontal and vertical extent through an efficient merger process. l The MCV at the mature stage exhibited some features of balanced vortex, which may induce a new updraft and contribute the following convection.