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DOI	10.1016/j.atmosres.2020.105118
	Lightning activity and its association with surface thermodynamics over the Tibetan Plateau
	Li J.; Wu X.; Yang J.; Jiang R.; Yuan T.; Lu J.; Sun M.
发表日期	2020
ISSN	0169-8095
卷号	245
英文摘要	Lightning activity over the Tibetan Plateau, which has an average altitude of higher than 4000 m above sea level, is investigated by using 20-year (1995–2014) LIS/OTD data. The effect of surface thermodynamics on lightning activity is examined for four sub-regions across the plateau based on the NCEP reanalysis data. The average lightning flash density over the entire Tibetan Plateau is 2.5 fl·km−2 yr−1, and the maximum flash density is 7.7 fl·km−2 yr−1 at eastern plateau. The geographical distribution of lightning flash density shows a gradual decrease from east to west across the Tibetan Plateau, from 4.3 fl·km−2 yr−1 on average over the Eastern Tibetan Plateau to 1.7 fl·km−2 yr−1 over the Western Tibetan Plateau. Over the plateau's main highland (>4500 m), there is a local maximum value of 5.7 fl·km−2 yr−1 in the center area of Nagqu. Lightning activity over the Tibetan Plateau mainly occurs in boreal summer, and 96.8% of the annual flashes occur during May–September. There is more lightning in the relatively dry spring, even in summer, over the main highland of the Tibetan Plateau. The results show that humidity and sensible heat fluxes play a vital role in the occurrence of lightning over the Tibetan Plateau. A new parameter, product of rainfall, Bowen ratio (defined as the ratio of the sensible heat fluxes to latent heat fluxes) and surface specific humidity, is proposed and shows a better correlation with lightning activity, generally displaying a larger correlation coefficient than rainfall alone or other parameters over the study sub-regions. © 2020 Elsevier B.V.
关键词	Geographical distribution Lightning protection Rain Sea level Correlation coefficient Eastern Tibetan plateau Lightning activity Lightning flash density NCEP reanalysis Sensible heat flux Specific humidity Surface thermodynamics Heat flux
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132363
推荐引用方式 GB/T 7714	Li J.,Wu X.,Yang J.,et al. Lightning activity and its association with surface thermodynamics over the Tibetan Plateau[J]. Atmospheric Research,2020,245.
APA	Li J..,Wu X..,Yang J..,Jiang R..,Yuan T..,...&Sun M..(2020).Lightning activity and its association with surface thermodynamics over the Tibetan Plateau.,245.
MLA	Li J.,et al."Lightning activity and its association with surface thermodynamics over the Tibetan Plateau".245(2020).