Cyclone Phase Space Characteristics of the Extratropical Transitioning Tropical Cyclones over the Western North Pacific |
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Authors: | Jinjie Song Juejing Han Yuan Wang |
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Institution: | (1) Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695-8208, USA |
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Abstract: | The cyclone phase space (CPS) method has been utilized to evaluate the extratropical transition (ET) of tropical cyclones
(TCs) in many recent publications. However, these studies mainly focused over the North Atlantic basin. In this paper, the
CPS characteristics of all the cyclones over the western North Pacific are investigated and discussed, with three parameters
calculated from the best-track data of the Regional Specialized Meteorological Center in Tokyo and the Japanese 25-yr reanalysis
data. It is concluded that most TCs over the western North Pacific possess the non-frontal and warm-core structure, while
a larger number of cyclones that have undergone ET hold the frontal and cold-core structure. The spatial pattern of the CPS
parameters indicates that the areas of tropical and extratropical cyclone activities could be demarcated by 30°N. The composite
and individual series of three parameters of the CPS indicate that the transformation of −V
TU from positive to negative leads to the start of ET, and could be considered as a potential predictor in operationally forecasting
an ET event. |
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Keywords: | tropical cyclone extratropical transition cyclone phase space |
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