DOI: 10.1016/j.atmosenv.2015.03.027
Scopus记录号: 2-s2.0-84925433138
论文题名: Evaluation of MEGAN predicted biogenic isoprene emissions at urban locations in Southeast Texas
作者: Kota S ; H ; , Schade G ; , Estes M ; , Boyer D ; , Ying Q
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 110 起始页码: 54
结束页码: 64
语种: 英语
英文关键词: 2006 TexAQS
; Biogenic emissions
; Community Multiscale Air Quality (CMAQ) model
; Isoprene
; Model of Emissions of Gases and Aerosols from Nature (MEGAN)
; Source apportionment
Scopus关键词: Aerosols
; Air quality
; Forecasting
; Ketones
; Quality control
; 2006 TexAQS
; Biogenic emission
; Community multi-scale air qualities
; Environmental quality
; Methyl vinyl ketones
; Ozone concentration
; Plant functional type
; Source apportionment
; Isoprene
; isoprene
; ketone
; vinyl derivative
; aerosol
; air quality
; atmospheric pollution
; biogenic emission
; climate prediction
; concentration (composition)
; emigration
; error analysis
; isoprene
; leaf area index
; oxidation
; urban atmosphere
; urban pollution
; air quality
; aircraft
; Article
; atmospheric dispersion
; Community Multiscale Air Quality model
; concentration (parameters)
; leaf area
; mathematical model
; Model of Emissions of Gases and Aerosol from Nature model
; oxidation
; photosynthetically active radiation
; priority journal
; United States
; urban area
; Houston
; Texas
; United States
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: Summertime isoprene emissions in the Houston area predicted by the Model of Emissions of Gases and Aerosol from Nature (MEGAN) version 2.1 during the 2006 TexAQS study were evaluated using a source-oriented Community Multiscale Air Quality (CMAQ) Model. Predicted daytime isoprene concentrations at nine surface sites operated by the Texas Commission of Environmental Quality (TCEQ) were significantly higher than local observations when biogenic emissions dominate the total isoprene concentrations, with mean normalized bias (MNB) ranges from 2.0 to 7.7 and mean normalized error (MNE) ranges from 2.2 to 7.7. Predicted upper air isoprene and its first generation oxidation products of methacrolein (MACR) and methyl vinyl ketone (MVK) were also significantly higher (MNB=8.6, MNE=9.1) than observations made onboard of NOAA's WP-3 airplane, which flew over the urban area. Over-prediction of isoprene and its oxidation products both at the surface and the upper air strongly suggests that biogenic isoprene emissions in the Houston area are significantly overestimated. Reducing the emission rates by approximately 3/4 was necessary to reduce the error between predictions and observations. Comparison of gridded leaf area index (LAI), plant functional type (PFT) and gridded isoprene emission factor (EF) used in MEGAN modeling with estimates of the same factors from a field survey north of downtown Houston showed that the isoprene over-prediction is likely caused by the combined effects of a large overestimation of the gridded EF in urban Houston and an underestimation of urban LAI. Nevertheless, predicted ozone concentrations in this region were not significantly affected by the isoprene over-predictions, while predicted isoprene SOA and total SOA concentrations can be higher by as much as 50% and 13% using the higher isoprene emission rates, respectively. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81755
Appears in Collections: 气候变化事实与影响
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作者单位: Zachry Department of Civil Engineering, Texas A and M University, College Station, TX, United States; Department of Atmospheric Sciences, Texas A and M University, College Station, TX, United States; Texas Commission of Environmental Quality, Austin, TX, United States; Department of Civil Engineering, Indian Institute of Technology,, Guwahati, India
Recommended Citation:
Kota S,H,, Schade G,et al. Evaluation of MEGAN predicted biogenic isoprene emissions at urban locations in Southeast Texas[J]. Atmospheric Environment,2015-01-01,110