| タイトル | Satellite observations of variations in tropical cyclone convection caused by upper-tropospheric troughs |
| 著者（英） | Stout, John; Chang, Simon W.; Steranka, Joseph; Shi, Jainn-Jong; Rodgers, Edward B. |
| 著者所属（英） | NASA Goddard Space Flight Center|North Carolina State Univ.|Naval Research Lab.|General Sciences Corp. |
| 発行日 | 1991-08-01 |
| 言語 | eng |
| 内容記述 | Satellite observations and numerical model results have been used to study the relationship between upper-tropospheric forcing and the oscillation of convection of tropical cyclones Florence (1988) and Irene (1981) during their mature stage over open warm oceans (SST greater than or equal to 26 C). It is suggested that the initiation and maintenance of intense convective outbreaks in tropical cyclones are related to the channeling and strengthening of their outflow by upper-tropospheric troughs. It is possible to enhance the convection in response to the outflow jet-induced import of eddy relative angular momentum and ascending motion associated with the thermally direct circulation. Both Florence and Irene are found to intensify after the onset of these convective episodes. It is also suggested that the cessation in the convection of the two tropical cyclones occurs when the upper-tropospheric troughs move near or over the tropical cyclones, resulting in the weakening of their outflow and the entrainment of dry upper-tropospheric air into their inner core. |
| NASA分類 | METEOROLOGY AND CLIMATOLOGY |
| レポートNO | 91A50161 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/346063 |
