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Tropical cyclone strength, precipitation, and environment in variable resolution CAM-MPAS simulations over Western North Pacific

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Abstract

The multi-year simulation of tropical cyclones (TCs) over the Western North Pacific (WNP) in the variable resolution (VR) CAM-MPAS model is studied. Experiments with the global quasi-uniform low resolution of 120 km (MPAS-UR) and the variable resolution mesh of 30–120 km refined over East Asia (MPAS-VR) are integrated from 1980 to 2005 following the Atmospheric Model Intercomparison Project protocol. By utilizing an objective detection method, TCs in ERA5 reanalysis and model simulations are tracked and compared against observations. MPAS-VR shows significant advantages over MPAS-UR as indicated by more realistic TC counts, intensities, lifetime distribution, and seasonal variation. The large-scale circulation and precipitation patterns associated with TCs are also improved in MPAS-VR relative to MPAS-UR. Based on the theory of Dynamic Genesis Potential Index, the multi-year TC records are further used to quantify the dependence of TC genesis on various dynamical environmental factors from the perspective of seasonal variation. We find that in ERA5, the relative contribution of the 500 hPa vertical pressure velocity term to TC genesis exceeds that of the 200–850 hPa vertical wind shear term, which is responsible for the August peak and strong seasonal variation of TC genesis. MPAS-UR fails to capture such relationship while MPAS-VR performs much better in this regard, suggesting that the higher skills in simulating the relative contributions from different dynamical environmental factors to the simulated seasonal cycle of TC genesis may explain the improvements from MPAS-UR to MPAS-VR.

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Data availability

The IBTrACS data is available at https://www.ncei.noaa.gov/products/international-best-track-archive?name=ib-v4-access. The 3-hourly TRMM 3B42 version 7 data provided by NASA GSFC is available at https://doi.org/10.5067/TRMM/TMPA/3H/7. The 6-hourly ERA5 reanalysis data provided by the Copernicus Climate Change Service can be downloaded from https://doi.org/10.24381/cds.bd0915c6, and the monthly ERA5 data is available at https://doi.org/10.24381/cds.6860a573. The CAM-MPAS model outputs are available from the corresponding authors on reasonable request.

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Acknowledgements

We greatly thank the High Performance Computing Center (HPCC) of Nanjing University and the Kunshan Supercomputing Center for providing the computational resources used in this work. We are grateful for the comments from two anonymous reviewers and the editor, which helped improve the original manuscript.

Funding

This work is supported by the National Natural Science Foundation of China (NSFC; 41925023) and the Fundamental Research Funds for the Central Universities (020714380170). This research is also supported by NSFC (91744208 and 41621005), the Ministry of Science and Technology of the People’s Republic of China (2017YFA0604002), and the Collaborative Innovation Center of Climate Change, Jiangsu Province.

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BY and MW contributed to the study conception and design. Material preparation, data collection and analysis were performed by YL. The first draft of the manuscript was written by YL and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Ben Yang or Minghuai Wang.

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Liang, Y., Yang, B., Wang, M. et al. Tropical cyclone strength, precipitation, and environment in variable resolution CAM-MPAS simulations over Western North Pacific. Clim Dyn 61, 2253–2267 (2023). https://doi.org/10.1007/s00382-023-06677-y

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