颱風觀測分析與統計預報整合研究─子計畫：應用雷達資料與統計氣候模式建立北臺灣定量降水預報模式之研究(III)
Date Issued
2001
Date
2001
Author(s)
DOI
892625Z002046
Abstract
The concept of typhoon circulation is applied to
develop an automatic Doppler velocity
dealiasing algorithm. And the algorithm was
tested with the Doppler velocity data of
Wu-Feng-Shan (WFS) radar during Typhoon
Herb. Then, the GBVTD technique is applied
to deduce the layered horizontal wind field of
typhoon vortex. The analyzed layered
wind-field of typhoon vortex is inserted into the
numerical model output wind-field by the
PSU-NCAR Mesoscale Model version 5 (MM5)
with a 6.67 km horizontal resolution. The 2-D
wind field layers are smoothed with the
nine-point moving average filter to remove the
discontinuities at the interface. Then, each of
these 2-D wind fields at different altitude is
processed using the scaled isobaric primitive
equation and hydrostatic equation to derive the
corresponding balanced mass field,
geo-potential field and temperature field. In the
future, it is planed to apply an iterative method
using MM5 model to further process the wind
field to obtain a dynamically balanced initial
condition . It is hoped that the radar data
assimilation processing can improve the NWP
model’s typhoon vortex initialization in order
to enhance the three- to twelve-hour
quantitative precipitation forecast (QPF).
Subjects
radial velocity dealiasing
the GBVTD technique
the initialization method of the typhoon vortex retrieved by radar data
Publisher
臺北市：國立臺灣大學土木工程學系暨研究所
Type
report
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