DOI: 10.1002/jgrd.50499
论文题名: The lightning activity associated with the dry and moist convections in the Himalayan Regions
作者: Penki R.K. ; Kamra A.K.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 12 起始页码: 6246
结束页码: 6258
语种: 英语
英文关键词: dry and moist convections
; lightning
; lightning and orographic convection
; lightning in the Himalayan regions
Scopus关键词: Atmospheric aerosols
; Atmospheric temperature
; Surface properties
; Aerosol optical depths
; Convective available potential energies
; Convective parameters
; Empirical orthogonal function analysis
; Lightning imaging sensors
; Moist convection
; Orographic convection
; Tropical rainfall measuring mission satellites
; Lightning
; aerosol
; annual variation
; correlation
; data acquisition
; empirical analysis
; lightning
; longwave radiation
; mountain
; optical depth
; orography
; parameterization
; satellite imagery
; Himalayas
; India
; Pakistan
英文摘要: Lightning activity in the dry environment of northwest India and Pakistan (NW) and in the moist environment of northeast India (NE) has been examined from the Optical Transient Detector and Lightning Imaging Sensor data obtained from the Tropical Rainfall Measuring Mission satellite during 1995-2010. In the NW region, seasonal variation of flash rate is annual with a maximum in July but is semi-annual with a primary maximum in April and a secondary maximum in September, in the NE region. On diurnal scale, flash rate is the maximum in the afternoons, in both the NE and NW regions. The correlation of flash rate with convective parameters, viz. surface temperature, convective available potential energy (CAPE) and outgoing long-wave radiation is better with convective activity in the NW than in the NE region. Mean value of aerosol optical depth at 550 nm is ~ 26% higher and is highly correlated with flash rate in NW as compared to that in NE. Results indicate that CAPE is ~ 120 times more efficient in NW than in the NE region for production of lightning. The empirical orthogonal function analysis of flash rate, surface temperature, and CAPE shows that variance of lightning activity in these regions cannot be fully explained by the variance in the surface temperature and CAPE alone, and that some other factors, such as orographic lifting, precipitation, topography, etc., may also contribute to this variance in these mountainous regions. Further, the increase in CAPE due to orographic lifting in the Himalayan foothills in the NE region may contribute to ~ 7.5% increase in lightning activity. Relative roles of the thermally induced and moisture-induced changes in CAPE are examined in these regions. This study merely raises the questions, and that additional research is required for explaining the fundamental reasons for the reported observations here. Key Points Variation flash rate annual in dry,semiannual wet convection flash rate correlated with convection in dry convection than in wet convection orographic lifting in Himalayan foothills contributes to the lightning © 2013. 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/63660
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: Indian Institute of Tropical Meteorology, Pune-411 008, India
Recommended Citation:
Penki R.K.,Kamra A.K.. The lightning activity associated with the dry and moist convections in the Himalayan Regions[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(12)