DOI: 10.1002/jgrd.50764
论文题名: Variability in ozone and its precursors over the Bay of Bengal during post monsoon: Transport and emission effects
作者: Mallik C. ; Lal S. ; Venkataramani S. ; Naja M. ; Ojha N.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 17 起始页码: 10190
结束页码: 10209
语种: 英语
英文关键词: box model
; chemistry
; marine regions
; NMHCs
; trace gasses
; transport
Scopus关键词: Chemistry
; Computer simulation
; Marine pollution
; Principal component analysis
; Box models
; Marine region
; NMHCs
; Trace gas
; transport
; Atmospheric movements
; air mass
; atmospheric modeling
; atmospheric plume
; atmospheric pollution
; atmospheric transport
; latitudinal gradient
; methane
; numerical model
; oxide
; ozone
; photochemistry
; trace gas
; Bangladesh
; Bay of Bengal
; Indian Ocean
英文摘要: Simultaneous measurements of O3 , CO, NOx , CH 4 , and light nonmethane hydrocarbons were made over the Bay of Bengal (BoB) during 28 October to 17 November 2010 to study the role of chemistry and dynamics. The measurements revealed large variability in O3 (11 to 60 ppbv) and CO (45 to 260 ppbv). Estimated south to north latitudinal gradients in O3 (3.95 ppbv/°) and CO (16.56 ppbv/°) were significantly higher than those observed during earlier campaigns. Hybrid Single-Particle Lagrangian Integrated Trajectory simulated back air trajectories were used to classify these measurements into pollution plumes from nearby sources (India-Bangladesh region and Southeast Asia), influenced by long-range transport and pristine marine air from the Indian Ocean. Interspecies correlations were used to identify emission signatures in these air masses, e.g., chemical proxies suggested influence of biofuel/biomass burning in NE-BoB and E-BoB air masses. Principle component analysis indicated contributions of ship emissions to NOx levels over the BoB. Influences of fire from the Myanmar and Thailand regions are shown to be the potential contributor to enhanced CO levels (>250 ppbv) over the BoB during 14-15 November. Diurnal variations in surface O3 revealed effects of advection, entrainment, and photochemistry. A chemical box model simulated the photochemical buildup in O3 in polluted air masses and daytime destruction in pristine oceanic air masses. Key PointsSimultaneous measurements of O3, CO, NOx and NMHCs over Bay of BengalLarge spatial heterogeneity due to transport from different source regionsDiurnal variations in O3 show distinct effects of dynamics and chemistry ©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/63367
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: Space and Atmospheric Sciences Division, Physical Research Laboratory, Navarangpura, Near Atira, Ahmedabad, Gujarat 380 009, India; Aryabhatta Research Institute of Observational Sciences, Nainital, India
Recommended Citation:
Mallik C.,Lal S.,Venkataramani S.,et al. Variability in ozone and its precursors over the Bay of Bengal during post monsoon: Transport and emission effects[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(17)