Abstract
Using Joint Warning Typhoon Center (JTWC) best track data during the period 1948–2010, decadal and interdecadal changes of annual category 4 and 5 tropical cyclone (TC) frequency in the western North Pacific basin were examined. By allowing all of the observed TCs in the JTWC dataset to move along the observed TC tracks in a TC intensity model, the annual category 4 and 5 TC frequency was simulated. The results agreed well with observations when the TC intensity prior to 1973 was adjusted based on time-dependent biases due to changes in measurement and reporting practices. The simulated and adjusted time series showed significant decadal (12–18 years) variability, while the interdecadal (18–32 years) variability was found to be statistically insignificant.
Numerical simulations indicated that changes in TC tracks are the most important factor for the decadal variability in the category 4 and 5 TC frequency in the western North Pacific basin, while a combined effect of changes in SST and vertical wind shear also contributes to the decadal variability. Further analysis suggested that the active phase of category 4 and 5 TCs is closely associated with an eastward shift in the TC formation locations, which allows more TCs to follow a longer journey, favoring the development of category 4 and 5 TCs. The active phase corresponds with the SST warming over the tropical central and eastern Pacific and the eastward extension of the monsoon trough, thus leading to the eastward shift in TC formation locations.
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Zhao, H., Wu, L. & Wang, R. Decadal variations of intense tropical cyclones over the western North Pacific during 1948–2010. Adv. Atmos. Sci. 31, 57–65 (2014). https://doi.org/10.1007/s00376-013-3011-5
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DOI: https://doi.org/10.1007/s00376-013-3011-5