DOI: 10.1016/j.atmosenv.2015.03.035
Scopus记录号: 2-s2.0-84925235235
论文题名: Spring and summer night-time high ozone episodes in the upper Brahmaputra valley of North East India and their association with lightning
作者: Bharali C ; , Pathak B ; , Bhuyan P ; K
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 109 起始页码: 234
结束页码: 250
语种: 英语
英文关键词: CWT
; Lightning
; LIS
; LNOx
; LO3
; Trace gas
Scopus关键词: Boundary layers
; Lightning protection
; Thunderstorms
; CWT
; LIS
; LNO<sub>x</sub>
; LO<sub>3</sub>
; Trace gas
; Lightning
; nitrogen oxide
; ozone
; episodic event
; lightning
; mixing ratio
; nocturnal boundary layer
; ozone
; spring (season)
; summer
; thunderstorm
; trace gas
; TRMM
; Article
; Bangladesh
; boundary layer
; circadian rhythm
; India
; ionizing radiation
; lightning
; night
; ozone layer
; priority journal
; radiation energy
; seasonal variation
; spring
; steady state
; summer
; surface property
; Brahmaputra Valley
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Simultaneous and round the clock measurement during thunderstorm and lightning has been used to study the impact of lightning generated NOx (LNOx) on O3 mixing ratio within the boundary layer during night-time. Lightning flash rate obtained from Lightning Image Sensor (LIS) on board TRMM over the Brahmaputra valley centred around Dibrugarh has been used to identify the events in which NOx was elevated with simultaneous dip in O3 for a short duration followed by subsequent elevation of O3 in spring and summer of 2012-2014. Seasonally averaged O3 attains higher values at night on thunderstorm days as compared to that on clear and cloudy days both in spring and summer i.e. as against a minimum night-time (1700-0500h) values of ~3ppb on clear days, the mean night-time level on thunderstorm days is ~18ppb in spring and ~12ppb in summer. The estimated steady state O3 concentration is well correlated with the NO2/NO ratio and found to be ~33% of the measured O3. One day isentropic concentration weighted trajectory (CWT) analysis carried out for the spring and summer seasons reveal that part of GWB and Bangladesh are the potential additional source of O3 in both the seasons. LNOx is found to contribute to ~33% of the measured O3 during the study period. Enhancement of O3 is well correlated with the lightning radiance indicating direct photodissociation of O3 due to lightning. δO3 is independent of the location of the flash rather depends on flash intensity. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81822
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Atmospheric Studies, Dibrugarh University, Dibrugarh, India
Recommended Citation:
Bharali C,, Pathak B,, Bhuyan P,et al. Spring and summer night-time high ozone episodes in the upper Brahmaputra valley of North East India and their association with lightning[J]. Atmospheric Environment,2015-01-01,109