DOI: 10.1002/2017JD027321
Scopus记录号: 2-s2.0-85042598698
论文题名: The Climatology of Low-Level Jet in Beijing and Guangzhou, China
作者: Miao Y. ; Guo J. ; Liu S. ; Wei W. ; Zhang G. ; Lin Y. ; Zhai P.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 5 起始页码: 2816
结束页码: 2830
语种: 英语
英文关键词: low-level jet
; planetary boundary layer
; synoptic pattern
Scopus关键词: annual cycle
; boundary layer
; climate forcing
; climatology
; jet
; long-term change
; megacity
; numerical method
; pressure gradient
; profiler
; synoptic meteorology
; Beijing [China]
; China
; Guangdong
; Guangzhou
英文摘要: The important roles of low-level jet (LLJ) in transport of heat, moisture, and pollutants have long been recognized. However, partly due to the lack of long-term observations, the characteristics of LLJs in Beijing and Guangzhou have not been well understood. Using long-term wind profiler observations and numerical simulations, the basic climatological characteristics of LLJ in Beijing and Guangzhou were documented, and their relationships with large- and local-scale forcings were investigated. The occurrence frequencies of LLJ in both megacities approximately exhibit a bimodal distribution during an annual cycle. In terms of the seasonality, the LLJs in Beijing occur more often in spring and winter, and those in Guangzhou appear more frequently from October to December and from February to April. Pronounced diurnal variations of LLJ are found in Beijing, where most LLJs occurred during the nighttime, and the diurnal variations of LLJ in Guangzhou are less prominent. Favorable synoptic conditions for LLJ formations in Beijing are those having a southwest-northeast or southeast-northwest pressure gradient across Beijing. Dominant synoptic patterns associated with LLJs in Guangzhou are those having a low-pressure or high-pressure system to the northwest. Overall, the LLJs are primarily induced by synoptic forcings and modulated by the diurnal evolution of planetary boundary layer. The key findings from this study provide us a better understanding of the LLJs in these highly populated regions. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114294
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China; Department of Earth System Science, Tsinghua University, Beijing, China
Recommended Citation:
Miao Y.,Guo J.,Liu S.,et al. The Climatology of Low-Level Jet in Beijing and Guangzhou, China[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(5)