Preprints
https://doi.org/10.5194/egusphere-2023-61
https://doi.org/10.5194/egusphere-2023-61
08 Mar 2023
 | 08 Mar 2023
Status: this preprint has been withdrawn by the authors.

Distinct role of intraseasonal and interannual sea surface temperature anomaly in the rapid intensification onset of Typhoon Megi (2010)

Caixia Shao, Xidong Wang, and Kaigui Fan

Abstract. This study aims to explain the rapid intensification (RI) onset of Typhoon Megi from a new perspective of the intraseasonal and interannual sea surface temperature anomaly (SSTA) effect. Simulation result indicates that the warmer intraseasonal SSTA along tropical cyclone (TC) track seems to be more conducive to the early occurrence of TC RI onset than the interannual SSTA for Megi. For the experiment with intraseasonal SSTA (SST-intraseasonal), it has cooler averaged SST in TC inner-core, outer-core, and external environment than the experiment with interannual SSTA (SST-interannual). Cooler TC outer-core and environmental SST provide more midlevel radial inflow, resulting in a strong TC lower-level warm core in SST-intraseasonal. For SST-interannual, the stronger upper-level VWS related to the warmer environmental SST strongly tilts TC structure, delaying the time of RI onset. Conceptual model of Megi RI onset proposed that, when TC lower-level warm core gradually weakens and TC upper-level alignment is basically completed, TC RI onset occurs. Our results underscore the effect of intraseasonal SSTA on Megi RI onset, and provide a new perspective for improving the prediction of TC RI onset.

This preprint has been withdrawn.

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Caixia Shao, Xidong Wang, and Kaigui Fan

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  • RC1: 'Comment on egusphere-2023-61', Anonymous Referee #1, 16 Mar 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-61', Anonymous Referee #1, 16 Mar 2023
Caixia Shao, Xidong Wang, and Kaigui Fan
Caixia Shao, Xidong Wang, and Kaigui Fan

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Short summary
This study investigates the effect of intraseasonal and interannual sea surface temperature anomaly (SSTA) on the rapid intensification (RI) onset of Typhoon Megi. Simulation results indicates that the warmer intraseasonal SSTA along typhoon track is more conducive to the early occurrence of Megi RI onset than interannual SSTA. Our conceptual model of Megi RI onset provides a new perspective for improving the prediction of tropical cyclone RI onset.