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Hybrid statistical–dynamical seasonal prediction of tropical cyclone track density over Western North Pacific

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Abstract

Compared with total account of basin wide tropical cyclones (TC) genesis, the prevailing tracks of TC activity and its potential of landfall is more important for disaster prevention. Despite its relatively lower predictability, a hybrid statistical–dynamical model was developed based on the relationship between leading empirical orthogonal function (EOF) modes of Western North Pacific (WNP) TC track patterns and large scale environmental fields. Due to the significant difference in both variability and associated mechanisms on different time scale as revealed in previous studies, the temporal variations of three leading principal components (PCs) are separated into decadal and inter-annual component and forecasted respectively. Potential predictors for Multi-Linear Regression (MLR) model was selected through stepwise regression analysis based on the correlation maps between each components of leading PCs and environmental fields in both observations and Beijing Climate Center climate system model version 1.1 (BCC_CSM1.1) hindcast. The forecast map of anomalous WNP TC track density was obtained through weighted composite of forecasted leading PCs and EOF modes according to its explained variance. One-year-out cross validation test shows that the hybrid model well captures the inter-annual variations of WNP TC track patterns. The hybrid model also shows significant improvement of prediction skill compared with ENSO reference forecast, indicates its potential of application in operational prediction.

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Data availability

In this study, the TC-best track dataset are downloaded from https://tcdata.typhoon.org.cn/en/zjljsjj_zlhq.html. The ERSSTv5 data are downloaded from https://psl.noaa.gov/data/gridded/data.noaa.ersst.v5.html, and the NCEP/NCAR-R1 reanalysis data are downloaded from https://psl.noaa.gov/data/gridded/data.ncep.reanalysis.html.

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Acknowledgements

This research was jointly supported by the National Key Research and Development Project of China (2017YFC1502303), the National Key Research and Development Program on Monitoring, Early Warning and Prevention of Major Natural Disaster (2018YFC1506000), the State Key Program of the National Natural Science of China (41730964), and the National Natural Science Foundation of China (41975091, 42175047). The authors wish to thank the editor and the anonymous reviewers for their constructive and insightful suggestions, and STI/CMA for offering the TC-best track dataset, Center for Earth System Modeling and Prediction of CMA for offering the BCC_CSM1.1 model data, and NOAA/PSL for offering ERSSTv5 and NCEP/NCAR-R1 data.

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Correspondence to Lijuan Chen.

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Zhang, D., Chen, L. Hybrid statistical–dynamical seasonal prediction of tropical cyclone track density over Western North Pacific. Clim Dyn 60, 2517–2532 (2023). https://doi.org/10.1007/s00382-022-06462-3

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  • DOI: https://doi.org/10.1007/s00382-022-06462-3

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