The Potential Impacts of Warmer-Continent-Related Lower-Layer Equatorial Westerly Wind on Tropical Cyclone Initiation
文献类型：期刊论文
| 作者 | Yuan, ZJ ; Qian, YK ; Qi, JD ; Wu, JJ |
| 刊名 | ADVANCES IN ATMOSPHERIC SCIENCES
 |
| 出版日期 | 2012 |
| 卷号 | 29期号:2页码:333-343 |
| ISSN号 | 0256-1530 |
| 关键词 | tropical cyclone human activities climate change global warming |
| 通讯作者 | qianyk@mail2.sysu.edu.cn |
| 中文摘要 | Global climate models predict that the increasing Amazonian-deforestation rates cause rising temperatures (increases of 1.8 degrees C to 8 degrees C under different conditions) and Amazonian drying over the 21st century. Observations in the 20th century also show that over the warmer continent and the nearby western South Atlantic Ocean, the lower-layer equatorial westerly wind (LLEWW) strengthens with the initiation of tropical cyclones (TCs). The warmer-continent-related LLEWW can result from the Coriolis-force-induced deflection of the cross-equatorial flow (similar to the well-known heat-island effect on sea breeze) driven by the enhanced land-sea contrast between the warmer urbanized continents and relatively cold oceans. This study focuses on the processes relating the warmer-continent-related LLEWW to the TC initiation and demonstrates that the LLEWW embedded in trade easterlies can directly initiate TCs by creating cyclonic wind shears and forming the intertropical convergence zone. In addition to this direct effect, the LLEWW combined with the rotating Earth can boost additional updraft vapor over the high sea-surface temperature region (factor 1), facilitating a surface-to-midtroposphere moist layer (factor 2) and convective instability (factor 3) followed by diabatic processes. According to previous studies, the diabatic heating in a finite equatorial region also activates TCs (factor 4) on each side of the Equator with weak vertical shear (factor 5). Factors 1-5 are favorable conditions for the initiation of severe TCs. Statistical analyses show that the earliest signal of sustained LLEWW not only leads the earliest signal of sustained tropical depression by >3 days but also explains a higher percentage of total variance. |
| 学科主题 | Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000300530700011 |
| 公开日期 | 2013-08-28 |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/10203]  |
| 专题 | 南海海洋研究所_热带海洋环境国家重点实验室(LTO) |
| 推荐引用方式 GB/T 7714 | Yuan, ZJ,Qian, YK,Qi, JD,et al. The Potential Impacts of Warmer-Continent-Related Lower-Layer Equatorial Westerly Wind on Tropical Cyclone Initiation[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2012,29(2):333-343. |
| APA | Yuan, ZJ,Qian, YK,Qi, JD,&Wu, JJ.(2012).The Potential Impacts of Warmer-Continent-Related Lower-Layer Equatorial Westerly Wind on Tropical Cyclone Initiation.ADVANCES IN ATMOSPHERIC SCIENCES,29(2),333-343. |
| MLA | Yuan, ZJ,et al."The Potential Impacts of Warmer-Continent-Related Lower-Layer Equatorial Westerly Wind on Tropical Cyclone Initiation".ADVANCES IN ATMOSPHERIC SCIENCES 29.2(2012):333-343. |
入库方式： OAI收割
来源：南海海洋研究所
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