The Potential Impacts of Warmer-Continent-Related Lower-Layer Equatorial Westerly Wind on Tropical Cyclone Initiation
Yuan, ZJ; Qian, YK; Qi, JD; Wu, JJ; qianyk@mail2.sysu.edu.cn
2012
发表期刊ADVANCES IN ATMOSPHERIC SCIENCES
ISSN0256-1530
卷号29期号:2页码:333-343
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.
部门归属[Yuan Zhuojian; Qian Yu-Kun; Qi Jindian] Sun Yat Sen Univ, Dept Atmospher Sci, Ctr Monsoon & Environm Res, Guangzhou 510275, Guangdong, Peoples R China; [Qian Yu-Kun] Chinese Acad Sci, S China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Wu Junjie] Civil Aviat Flight Univ China, Guanghan 618307, Peoples R China
关键词Tropical Cyclone Human Activities Climate Change Global Warming
学科领域Meteorology & Atmospheric Sciences
语种英语
资助项目LTO
WOS记录号WOS:000300530700011
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10203
专题热带海洋环境国家重点实验室(LTO)
通讯作者qianyk@mail2.sysu.edu.cn
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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,&qianyk@mail2.sysu.edu.cn.(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.
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