著者
ITO Kosuke WU Chun-Chieh CHAN Kelvin T. F. TOUMI Ralf DAVIS Chris
出版者
Meteorological Society of Japan
雑誌
気象集誌. 第2輯 (ISSN:00261165)
巻号頁・発行日
pp.2020-001, (Released:2019-10-08)
被引用文献数
1

While the fundamental understanding of the movement of a tropical cyclone (TC) is fairly mature, there are still notable advancements being made. This paper summarizes new concepts and updates on existing fundamental theories on TC movement obtained from simplified barotropic models, full-physics models, and data analysis particularly since 2014. It includes the recent works on the interaction of the TC with its environment and the fundamental aspects of predictability related to TC movement. The conventional concepts of the steering flow, β-gyre, and diabatic heating remain important. Yet, a more complete understanding of mechanisms governing TC movement serves as an important basis toward the further improvement of track forecasts.
著者
CHAN Kelvin T. F. CHAN Johnny C. L.
出版者
Meteorological Society of Japan
雑誌
気象集誌. 第2輯 (ISSN:00261165)
巻号頁・発行日
pp.2018-042, (Released:2018-04-27)
被引用文献数
2

This paper presents a summary of some of the observational and numerical studies on the climatology and possible change mechanisms of the outer-core wind structure of a tropical cyclone (TC), which has been generally referred to as size, a term also to be used in this review although various definitions have been given in the literature. In all the ocean basins where TCs exist, TC size has been found to vary with season, year, decade, latitude and longitude. Such variations are related to those in the synoptic flow patterns in which the TCs are embedded. Several factors have been identified to be responsible for changes in TC size, which include environmental humidity, vortex structure, sea surface temperature and planetary vorticity. Each of these factors can modify the transport of lower tropospheric angular momentum into the TC and hence cause changes in its size. The paper ends with a discussion of outstanding issues in the study of the outer-core wind structure of a TC.
著者
伊藤 耕介 WU Chun-Chieh CHAN Kelvin T. F. TOUMI Ralf DAVIS Chris
出版者
公益社団法人 日本気象学会
雑誌
気象集誌. 第2輯 (ISSN:00261165)
巻号頁・発行日
vol.98, no.1, pp.5-17, 2020
被引用文献数
1

<p>台風の移動の基礎的な理解はかなり成熟しているが、注目に値する研究の進展が近年も見られる。本論文では、単純化された順圧モデル・精緻な物理モデル・データ解析によって、主に2014年以降に得られた台風の移動に関する新しい概念や既存の概念に関する新たな知見を集約する。これには、台風の移動に関する環境場と台風の相互作用、および、予測可能性の研究を含んでいる。指向流・βジャイア・非断熱加熱といった従来の概念は依然として重要であるが、台風の進路を説明するメカニズムをより正確に理解することは、さらなる進路予報の精度向上に向けて、重要な基礎をなすであろう。</p>