气候变化领域集成服务门户(CCPortal): Effects of background state on tropical cyclone size over the Western North Pacific and Northern Atlantic

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DOI	10.1007/s00382-018-4372-3
	Effects of background state on tropical cyclone size over the Western North Pacific and Northern Atlantic
	Ma C.; Peng M.; Li T.; Sun Y.; Liu J.; Bi M.
发表日期	2019
ISSN	0930-7575
起始页码	4143
结束页码	4156
卷号	52 期号:2020-07-08
英文摘要	Observational studies have shown that tropical cyclone (TC) size, commonly measured by the radius of the 17 m s −1 surface wind speed, in the western North Pacific (WNP) is statistically larger than its counterpart in the North Atlantic (NA). In this study we conduct idealized simulations for TC developments using high-resolution WRF model to understand the reason behind the size difference and relative contributions from among temperature, moisture and wind fields to modulate the TC size. Climatological mean states of the WNP and NA were computed using long-term analysis fields and used as background fields for the simulations. With identical initial vortices, TCs in the WNP environment evolve to larger sizes than those in the NA environment, consistent with previous observational studies and our own analysis using best track data. Experiments were designed to separate impacts of the specific humidity, wind fields, and the temperature profiles. Our simulations indicate that the temperature profile is the dominant factor in controlling the TC size with its influence about twice larger than from the specific humidity or the wind fields. The background climatological state in the WNP has a higher SST and a lower tropopause temperature than in the NA. This condition is favorable for more intense TCs. As the size is proportional to the intensity of the storm, this more unstable atmospheric condition is the reason behind the larger size observed in the WNP. The size of the inner core, represented by the radius of the maximum wind, settled down quickly in the early stage and is less correlated to the evolution of the outer size which continues to increase with the intensity increasing. The more favorable condition for the TC development and larger size in the WNP also correspond to the larger surface entropy flux. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	atmospheric moisture; humidity; observational method; temperature profile; tropical cyclone; tropopause; wind field; wind velocity; Atlantic Ocean; Atlantic Ocean (North); Pacific Ocean; Pacific Ocean (North)
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146401
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environmental Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, China; GD-IT/Naval Research Laboratory, Monterey, CA, United States; International Pacific Research Center and Department of Atmospheric Sciences, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI, United States; College of Meteorology and Oceanography, National University of Defense Technology, Nanjing, 21101, China
推荐引用方式 GB/T 7714	Ma C.,Peng M.,Li T.,et al. Effects of background state on tropical cyclone size over the Western North Pacific and Northern Atlantic[J],2019,52(2020-07-08).
APA	Ma C.,Peng M.,Li T.,Sun Y.,Liu J.,&Bi M..(2019).Effects of background state on tropical cyclone size over the Western North Pacific and Northern Atlantic.Climate Dynamics,52(2020-07-08).
MLA	Ma C.,et al."Effects of background state on tropical cyclone size over the Western North Pacific and Northern Atlantic".Climate Dynamics 52.2020-07-08(2019).