DOI: 10.1002/2016JD024782
论文题名: The effects of Sao Paulo urban heat island on lightning activity: Decadal analysis (1999-2009)
作者: Bourscheidt V. ; Pinto O. ; Jr. ; Naccarato K.P.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 9 起始页码: 4429
结束页码: 4442
语种: 英语
英文关键词: lightning activity
; Sao Paulo
; temperature contrast
; thunderstorm initiation
; urban heat islands
Scopus关键词: cloud to ground lightning
; heat island
; MODIS
; seasonality
; surface temperature
; temperature gradient
; thunderstorm
; urban area
; Brazil
; Sao Paulo [Brazil]
英文摘要: Eleven years of lightning data from the Brazilian Integrated National Lightning Detection Network were used to analyze the effects of the urban heat island (UHI) of Sao Paulo on lightning activity, extending the investigation of previous works. Cloud-To-ground lightning data were analyzed in both spatial and temporal perspectives, using different approaches: flash density, flash rate, thunderstorm hours (TH), and the cell initiation technique (CIT), which aims to identify the onset of thunderstorms. Land surface temperature (LST) from MODIS (Moderate Resolution Imaging Spectroradiometer) was used to analyze the UHI evolution over the years. MODIS data were validated using ground stations, distributed within the urban area. Different time intervals (seasonal and intraday) were used in an attempt to separate local convective systems from synoptic-scale events. The results indicate significant effects of the UHI (using LST) on THs and CIT. The CIT showed a nearly ring pattern, especially during the afternoon (14:00-18:00 LT) of summer months, reinforcing temperature contrast as a condition for storm initiation. The results also suggest an amplification of the UHI effects on thunderstorm activity by local factors (sea and country breeze, synoptic events, and terrain). Higher flash rates were also observed throughout the urban region, which influences the lightning density. Temporal analysis indicates that minimum temperature and lightning activity increase in wintertime. In summary, the results agree with previous studies about the UHI and indicate its importance on lightning occurrence, especially by increasing the temperature contrast and the instability in these regions. © 2016. 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/62874
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Environmental Sciences, Federal University of Sao Carlos, São Paulo, Brazil; Atmospheric Electricity Group, Earth System Science Center, Brazilian National Institute for Space Research, São Paulo, Brazil
Recommended Citation:
Bourscheidt V.,Pinto O.,Jr.,et al. The effects of Sao Paulo urban heat island on lightning activity: Decadal analysis (1999-2009)[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(9)