ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Research on Application of GFDL Vortex Tracker Technique in the Zhejiang Regional NWP models
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Abstract:
The most common tropical cyclone (TC) center identification method is searching for minimum sea level pressure (MSLP), which still has some shortcoming. In this paper, TC center identification method and intensity estimation method based on GFDL Vortex Tracker Technique (GVT) has been studied in regional numerical weather prediction model application. Detailed comparisons between GVT and three traditional TC center location and intensity estimation techniques, including MSLP, using maximum vorticity value at 500hPa (VT500), and using minimum geopotential height at 500hPa (H500) was made. Using H500, VT500 and MSLP methods to determined TC center location, there will be some degree of zigzag-shaped irregular swing path, especially using VT500 method. The VT500 method has largest irregular swing amplitude and the positioning effect is the worst. GVT method can better correct the zigzag-shaped swing path and makes the model prediction path closer to the observed one, and the positioning effect is the best. However, the H500, MSLP and GVT are relatively closely when the typhoon location is away from the coastline. The errors of the minimum pressure of TC center by these four methods show that the VT500 method has the largest error, the GVT method has the smallest error, and the MSLP and H500 methods’ error are between VT500 and GVT. The errors of maximum wind speed near the TC center by four methods show the error of the four methods is not much different. The operational application in 2016-2018 show that the Zhejiang Typhoon Vortex Tracker System (ZJTVTS) based on GVT technology can improve the prediction quality of Zhejiang WRF-ADAS Regional Model System (ZJWARMS) and Zhe-Jiang WRF-ADAS Rapid Refresh System (ZJWARRS).
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