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Effect of model resolution on simulation of tropical cyclone landfall in East Asia based on a comparison of 25- and 50-km HiRAMs

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Abstract

The effect of model resolution on the simulation of tropical cyclone (TC) landfall frequency in East Asia [including the South China Sea (SCS), Taiwan and coastal areas of East China (TWCN) and Japan (JP)] was investigated by comparing Atmospheric Model Intercomparison Project (AMIP) type simulations on the basis of 50-km High Resolution Atmospheric Models (HiRAMs) and 25-km HiRAM. The number of TC landfalls in the TWCN region was realistically simulated by the 50-km HiRAM ensemble model. However, fewer (more) TCs were steered westward (northward) toward the SCS (JP) because of an overestimation of the monsoon trough in the western North Pacific (WNP). The overestimation created a low-level cyclonic circulation anomaly in the WNP, which substantially modified steering flow. Consequently, more (less) TC made landfall in JP (SCS). The overestimation of the monsoon trough in model was primarily resulted from compounding factors, including the AMIP type simulation, upscale feedback of TCs to mean flow and the monsoon flow–topography interaction in the Indochina Peninsula Mountains and Philippine. First, the SST was negatively correlated with precipitation in the WNP during the typhoon season for the observation. Conversely, the SST–precipitation relationship was positive in the AMIP run. Second, the upscale feedback of TCs to mean flow (monsoon trough) was overestimated, which in term contributed to the overestimation of monsoon trough. Third, the model underestimated the mountain lifting effect in the Indochina Peninsula and Philippine. Overall, the aforementioned biases were substantially improved by increasing model’s horizontal resolution from 50-km to 25-km HiRAM.

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Availability of data and materials

The GPCP v2.3 precipitation data was provided by NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from the website at https://psl.noaa.gov/data/gridded/data.gpcp.html. CFSR data was from NCAR and was available at the website https://climatedataguide.ucar.edu/climate-data/climate-forecast-system-reanalysis-cfsr. The observed SST and sea-ice concentration are from the Met Office Hadley Centre, and was available at https://www.metoffice.gov.uk/hadobs/hadisst/index.html. The best-track data was from JTWC and available at https://www.metoc.navy.mil/jtwc/jtwc.html. The HiRAM simulations are provided by Anthropogenic Climate Change Center (https://www.rcec.sinica.edu.tw/) and the data was available by a request e-mail. All calculation and figures were produced using the NCAR Command Language (NCL) (https://www.ncl.ucar.edu/) version 6.3.0.

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Acknowledgements

This study was supported by the National Science and Technology Council (NSTC), Taiwan (R. O. C.) under grant numbers 109-2111-M-003-002, 109-2111-M-845-001, 110-2111-M-003-002, 110-2111-M-845-001, and 109-2121-M-001-004. The authors would like to express their gratitude to the National Center for High-Performance Computing (NCHC), and the National Applied Research Laboratories (NARLabs) for providing computer facilities. We also thank Mr. HC Liang to provide the simulations and TC data. This manuscript was edited by Wallace Academic Editing.

Funding

This study was supported by the National Science and Technology Council (NSTC), Taiwan (R. O. C.) under grant numbers 109-2111-M-003-002, 109-2111-M-845-001, 110-2111-M-003-002, 110–2111-M-845-001, and 109-2121-M-001-004.

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K-CC wrote the main manuscript and prepared the figures and tables; C-HT and C-CH wrote part of text and revised the manuscript; H-HH and C-YT provided simulations and reviewed manuscript.

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Correspondence to Chi-Cherng Hong.

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Chen, KC., Tsou, CH., Hong, CC. et al. Effect of model resolution on simulation of tropical cyclone landfall in East Asia based on a comparison of 25- and 50-km HiRAMs. Clim Dyn 61, 2085–2101 (2023). https://doi.org/10.1007/s00382-023-06668-z

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