Statistical–Dynamical Seasonal Forecast of Western North Pacific and East Asia Landfalling Tropical Cyclones using the GFDL FLOR Coupled Climate Model

Wei Zhang; Gabriel A Vecchi; Gabriele Villarini; Hiroyuki Murakami; Richard Gudgel; Xiaosong Yang

doi:10.1175/JCLI-D-16-0487.1

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Statistical–Dynamical Seasonal Forecast of Western North Pacific and East Asia Landfalling Tropical Cyclones using the GFDL FLOR Coupled Climate Model

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Statistical–Dynamical Seasonal Forecast of Western North Pacific and East Asia Landfalling Tropical Cyclones using the GFDL FLOR Coupled Climate Model

Wei Zhang, Gabriel A Vecchi, Gabriele Villarini, Hiroyuki Murakami, Richard Gudgel and Xiaosong Yang

Journal of climate, Vol.30(6), pp.2209-2232

03/15/2017

DOI: 10.1175/JCLI-D-16-0487.1

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Abstract

Abstract This study attempts to improve the prediction of western North Pacific (WNP) and East Asia (EA) landfalling tropical cyclones (TCs) using modes of large-scale climate variability [e.g., the Pacific meridional mode (PMM), the Atlantic meridional mode (AMM), and North Atlantic sea surface temperature anomalies (NASST)] as predictors in a hybrid statistical–dynamical scheme, based on dynamical model forecasts with the GFDL Forecast-Oriented Low Ocean Resolution version of CM2.5 with flux adjustments (FLOR-FA). Overall, the predictive skill of the hybrid model for the WNP TC frequency increases from lead month 5 (initialized in January) to lead month 0 (initialized in June) in terms of correlation coefficient and root-mean-square error (RMSE). The hybrid model outperforms FLOR-FA in predicting WNP TC frequency for all lead months. The predictive skill of the hybrid model improves as the forecast lead time decreases, with values of the correlation coefficient increasing from 0.56 for forecasts initialized in January to 0.69 in June. The hybrid models for landfalling TCs over the entire East Asian (EEA) coast and its three subregions [i.e., southern EA (SEA), middle EA (MEA), and northern EA (NEA)] dramatically outperform FLOR-FA. The correlation coefficient between predicted and observed TC landfall over SEA increases from 0.52 for forecasts initialized in January to 0.64 in June. The hybrid models substantially reduce the RMSE of landfalling TCs over SEA and EEA compared with FLOR-FA. This study suggests that the PMM and NASST/AMM can be used to improve statistical/hybrid forecast models for the frequencies of WNP or East Asia landfalling TCs.

Details

Title: Subtitle: Statistical–Dynamical Seasonal Forecast of Western North Pacific and East Asia Landfalling Tropical Cyclones using the GFDL FLOR Coupled Climate Model
Creators: Wei Zhang - Nanjing University of Information Science and Technology
Gabriel A Vecchi - Princeton University
Gabriele Villarini - University of Iowa
Hiroyuki Murakami - Princeton University
Richard Gudgel - National Oceanic and Atmospheric Administration
Xiaosong Yang - National Oceanic and Atmospheric Administration
Resource Type: Journal article
Publication Details: Journal of climate, Vol.30(6), pp.2209-2232
DOI: 10.1175/JCLI-D-16-0487.1
ISSN: 0894-8755
eISSN: 1520-0442
Grant note: DOI: 10.13039/100000001, name: National Science Foundation, award: AGS-1262091; DOI: 10.13039/100000001, name: National Science Foundation, award: AGS-1262099
Language: English
Date published: 03/15/2017
Academic Unit: Civil and Environmental Engineering
Record Identifier: 9984202146102771

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