Abstract
The modulation of tropical cyclone (TC) genesis over the western North Pacific (WNP) and the tropical North Atlantic (ATL) by the Madden–Julian Oscillation (MJO) is investigated based on observational analysis and numerical simulations. A genesis potential index (GPI) is used to investigate relative contributions of environmental parameters associated with the MJO to TC genesis. It is found that relative humidity plays the most important role in modulating TC genesis in the WNP, the Gulf of Mexico and the western Caribbean Sea (GOM), while vertical wind shear associated with the MJO has the most significant impact on TC activities in the eastern Atlantic (EAT). To further understand the relative importance of the MJO dynamic and thermodynamic impact on TC activities, idealized numerical model experiments are conducted using the Advanced Research version of the Weather Research and Forecasting model (WRF-ARW). The results are consistent with that of observational analysis, indicating that TC activities in the WNP, the GOM and the EAT are modulated by the MJO. Specific humidity anomalies related to the MJO exert the strongest impact on TC development in the WNP and the GOM, while the vertical wind shear is the most critical factor in the EAT.
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Acknowledgements
This work is jointly supported by NSFC grants 41630423, China 973Project 2015CB453201, NOAA grant NA18OAR4310298, NSFC grants 41875069, 41475084 and 41575043, NSF grant AGS-16-43297, NRL grant N00173-16-1-G906, and the priority academic program development of Jiangsu Higher Education institutions (PAPD). This is SOEST contribution number 10471, IPRC contribution number 1349, and ESMC number 237.
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Zhao, C., Li, T. Basin dependence of the MJO modulating tropical cyclone genesis. Clim Dyn 52, 6081–6096 (2019). https://doi.org/10.1007/s00382-018-4502-y
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DOI: https://doi.org/10.1007/s00382-018-4502-y