A positive feedback process between tropical cyclone and moisture conveyor belt

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13569
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Kyushu University
• Principal Investigator: KAWAMURA Ryuichi 九州大学, 理学研究院, 教授 (30303209)
• Co-Investigator(Renkei-kenkyūsha): YOSHIMURA Kei 東京大学, 大気海洋研究所, 准教授 (50376638) ; SHINODA Taro 名古屋大学, 地球水循環センター, 准教授 (50335022) ; KATO Masaya 名古屋大学, 地球水循環センター, 研究員 (00648272) ; KAWANO Tetsuya 九州大学, 大学院理学研究院, 助教 (30291511)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 台風 / 熱帯低気圧 / モンスーン / 水蒸気輸送 / 水蒸気コンベアベルト

Outline of Final Research Achievements

To construct a new conceptual tropical cyclone (TC) model from a macroscopic view, we have examined a positive feedback process between the intensity of a prototypical TC (i.e., Typhoon Man-yi 2007) and the moisture conveyor belt (MCB) that has been suggested by previous researches. We performed SST sensitivity experiments, using a cloud resolving regional model with a spatial resolution of 0.05 degree longitude by 0.05 degree latitude, and made forward and backward trajectory analyses for Man-yi to evaluate how air parcels related to latent heat release intrude into the TC inner core region through the MCB and to verify whether such a feedback process operates efficiently. We also conducted a non-existence TC run to confirm that a TC can trigger the MCB formation under the background monsoon westerlies and investigated another TC (Halong 2002) to validate that the TC-MCB feedback is applicable to other western North Pacific TCs.

Free Research Field

気象学、気候力学