Wintertime extratropical cyclone frequency around Japan
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Data analysis and regional atmospheric model (RAM) experiments revealed key factors in the control of wintertime cyclone passage routes from Northeast Asia to the western North Pacific. The cyclone routes were independent of the global flow pattern in the interannual variability, while cyclone growth closely agreed with linear baroclinic theory. The RAM experiments with a different lateral boundary condition composed of a combination of monthly mean and transient components also showed that the upstream eddies are important for the track route, but the background states are not. Additionally, the RAM experiments showed that the mean flow controlled the growth rate of cyclones.
KeywordsExtratropical cyclones Cyclone tracking Regional atmospheric model
We thank Prof. Shoshiro Minobe for giving us insightful comments on our earlier results. The first author is supported by a Grant-in-Aid for Young Scientists (B) 18740293, by a Grant-in-Aid for Scientific Research on Innovative Areas 22106008, by a Grant-in-Aid for Scientific Research (A) 22244057, and by Research Program on Climate Change Adaptation, all of Ministry of Education, Sports, Culture, Science, and Technology, Japan; and supported by Global Environment Research Fund S-5-3 of the Ministry of the Environment, Japan. The model simulations were performed using the Hokkaido University High Performance Computing System. All figures were drawn using Grid Application Development Software (GrADS).
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