DOI: 10.1016/j.atmosenv.2015.02.012
Scopus记录号: 2-s2.0-84922374686
论文题名: Seasonal behavior and long-term trends of tropospheric ozone, its precursors and chemical conditions over Iran: A view from space
作者: Choi Y ; , Souri A ; H
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 106 起始页码: 232
结束页码: 240
语种: 英语
英文关键词: Chemical condition
; Long-term trends
; Ozone precursors
; Remote sensing
; Tropospheric ozone
Scopus关键词: Carbon monoxide
; Industrial emissions
; Nitrogen oxides
; Ozone
; Remote sensing
; Sun
; Troposphere
; Ultraviolet spectrometers
; Uncertainty analysis
; Chemical conditions
; Least-squares harmonic estimations
; Long-term trend
; Microwave limb sounder
; Ozone monitoring instruments
; Ozone precursors
; Spatial and temporal variation
; Tropospheric ozone
; Air pollution
; carbon monoxide
; formaldehyde
; nitrogen dioxide
; ozone
; atmospheric pollution
; biomass burning
; formaldehyde
; nitrogen dioxide
; oxidation
; ozone
; remote sensing
; seasonality
; trend analysis
; troposphere
; urban atmosphere
; urban pollution
; Article
; boundary layer
; climate
; Europe
; heating
; Iran
; North America
; ozone layer
; priority journal
; sea
; seasonal variation
; solar radiation
; time series analysis
; troposphere
; uncertainty
; wind
; winter
; Ahwaz
; East Azerbaijan
; Esfahan [Esfahan (PRV)]
; Esfahan [Iran]
; Iran
; Khuzestan
; Mashhad
; Razavi Khorasan
; Tabriz
; Tehran [Iran]
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: To identify spatial and temporal variations over the Iranian region, this study analyzed tropospheric formaldehyde (HCHO) and nitrogen dioxide (NO2) columns from Ozone Monitoring Instrument (OMI), carbon monoxide (CO) columns from the Measurement of Pollution in the Troposphere (MOPITT), and tropospheric column O3 (TCO) from OMI/MLS (Microwave Limb Sounder) satellites from 2005 to 2012. The study discovered high levels of HCHO (~12×1015molec./cm2) from plant isoprene emissions in the air above parts of the northern forest of Iran during the summer and from the oxidation of HCHO precursors emitted from petrochemical industrial facilities and biomass burning in South West Iran. This study showed that maximum NO2 levels (~18×1015molec./cm2) were concentrated in urban cities, indicating the predominance of anthropogenic sources. The results indicate that maximum concentrations were found in the winter, mainly because of weaker local winds and higher heating fuel consumption, in addition to lower hydroxyl radicals (OH). The high CO concentrations (~2×1018molec./cm2) in the early spring were inferred to mainly originate from a strong continental air mass from anthropogenic CO "hotspots" including regions around Caspian Sea, Europe, and North America, although the external sources of CO were partly suppressed by the Arabian anticyclone and topographic barriers. Variations in the TCO were seen to peak during the summer (~40DU), due to intensive solar radiation and stratospheric sources. This study also examined long-term trends in TCO and its precursors over a period of eight years in five urban cities in Iran. To perform the analysis, we estimated seasonal changes and inter-seasonal variations using least-squares harmonic estimation (LS-HE), which reduced uncertainty in the trend by 5-15%. The results showed significant increases in the levels of HCHO (~0.08±0.06×1015molec./cm2yr-1), NO2 (~0.08±0.02×1015molec./cm2yr-1), and peak annual TCO (~0.59±0.56DUyr-1) but decreases in minimum annual TCO (~-0.42±0.60DUyr-1) caused by an increase in NO2 species and annual CO (~-0.95±0.41×1016molec./cm2yr-1) partly resulting from the transport of reduced CO. The time series of the HCHO/NO2 column ratio (a proxy for the chemical conditions) indicated that during the last decade, the cities of Tehran, Ahvaz, and Isfahan exhibited steady chemical conditions while Tabriz and Mashhad exhibited a change from NOx-saturated/mixed to more NOx-sensitive chemical conditions. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81921
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth and Atmospheric Sciences, University of Houston, 312 Science and Research Building 1, Houston, TX, United States
Recommended Citation:
Choi Y,, Souri A,H. Seasonal behavior and long-term trends of tropospheric ozone, its precursors and chemical conditions over Iran: A view from space[J]. Atmospheric Environment,2015-01-01,106