Seasonal prediction for tropical cyclone frequency around Taiwan using teleconnection patterns
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In this study, a statistical model is developed to predict the frequency of tropical cyclones (TCs) that influence Taiwan in boreal summer. Predictors are derived from large-scale environments from February to May in six regions, including four atmospheric circulation predictors over the western sea and eastern sea of Australia, the subtropical western North Pacific (SWNP), and the eastern sea of North America, and two sea surface temperature predictors in the Southeast Indian Ocean and the North Atlantic. The statistical model is verified based on statistical cross-validation tests and by contrasting the differences in the large-scale environments between high and low TC frequency years hindcasted by the model. The results show the relationships of two atmospheric circulation predictors and one SST predictor around Australia with Antarctic Oscillation (AAO) pattern, as well as the relationships of those in the SWNP and around eastern sea of North America with Pacific/North American teleconnection (PNA) pattern. When the anomalous anticyclone around Australia (positive AAO pattern) and the one over the region from eastern sea of North America and the Aleutian Islands to the SWNP (negative PNA pattern) are both strengthened from February, the trade wind in the equatorial Pacific is intensified and consequently plays an important role in steering TCs towards Taiwan during boreal summer.
KeywordsBoreal Summer Teleconnection Pattern Seasonal Prediction Anomalous Anticyclone Anomalous Anticyclonic Circulation
This work is supported by NSC98-2111-M-002-008-MY3 and NSC100-2199-M-001-029-MY5.
- Choi KS, Kim DW, Byun HR (2009) Statistical model for seasonal prediction of tropical cyclone frequency around Korea. Asia-Pac J Atmos Sci 45:21–32Google Scholar
- Ho CH, Kim JH, Kim HS, Sui CH, Gong FY (2005) Possible influence of the Antarctic Oscillation on tropical cyclone activity in the western North Pacific. J Geophys Res 110: doi: 10.1029/2005JD005766
- Kalnay E, Kanamitsu M, Kistler R, Collins W, Deaven D, Gandin L, Iredell M, Saha S, White G, Woollen J, Zhu Y, Leetmaa A, Reynolds R, Chelliah M, Ebisuzaki W, Higgins W, Janowiak J, Mo KC, Ropelewski C, Wang J, Jenne R, Joseph D (1996) The NCEP/NCAR 40-year reanalysis project. Bull Am Meteor Soc 77:437–471CrossRefGoogle Scholar
- Wilks DS (1995) Statistical methods in the atmospheric sciences. Academic Press, San Diego, p 467Google Scholar