| DOI: | 10.1016/j.atmosenv.2017.12.037
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| Scopus记录号: | 2-s2.0-85039970064
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| 论文题名: | The impact of urban canopy meteorological forcing on summer photochemistry |
| 作者: | Huszár P; , Karlický J; , Belda M; , Halenka T; , Pišoft P
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| 刊名: | Atmospheric Environment
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| ISSN: | 0168-2563
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| EISSN: | 1573-515X
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| 出版年: | 2018
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| 卷: | 176 | | 起始页码: | 209
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| 结束页码: | 228
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| 语种: | 英语
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| 英文关键词: | Climate
; Nitrogen oxides
; Ozone
; Photochemistry
; Process analysis
; Regional climate
; Tropospheric chemistry
; Urban canopy
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| Scopus关键词: | Air quality
; Atmospheric movements
; Atmospheric temperature
; Chemical analysis
; Chemical reactions
; Climate models
; Diffusion
; Mixing
; Nitric acid
; Nitrogen oxides
; Ozone
; Photochemical reactions
; Reduction
; Turbulence
; Wind
; Climate
; Process analysis
; Regional climate
; Tropospheric chemistry
; Urban canopies
; Urban transportation
; ammonia
; carbon monoxide
; nitric acid
; nitric oxide
; nitrogen
; oxide
; ozone
; sulfur dioxide
; air quality
; biogenic emission
; canopy exchange
; climate modeling
; concentration (composition)
; nitric acid
; nitrogen oxides
; ozone
; parameterization
; photochemistry
; regional climate
; turbulent diffusion
; urban area
; vertical mixing
; wind velocity
; advection
; air quality
; Article
; biogenesis
; calculation
; canopy
; concentration process
; diffusion coefficient
; dry deposition
; environmental temperature
; Europe
; exhaust gas
; land use
; meteorology
; photochemistry
; priority journal
; summer
; surface property
; turbulent flow
; urban area
; wind
; Europe
|
| Scopus学科分类: | Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
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| 英文摘要: | The regional climate model RegCM4.4, including the surface model CLM4.5, was offline coupled to the chemistry transport model CAMx version 6.30 in order to investigate the impact of the urban canopy induced meteorological changes on the longterm summer photochemistry over central Europe for the 2001–2005 period. First, the urban canopy impact on the meteorological conditions was calculated performing a reference experiment without urban landsurface considered and an experiment with urban surfaces modeled with the urban parameterization within the CLM4.5 model. In accordance with expectations, strong increases of urban surface temperatures (up to 2–3 K), decreases of wind speed (up to −1 ms−1) and increases of vertical turbulent diffusion coefficient (up to 60–70 m2s-1) were found. For the impact on chemistry, these three components were considered. Additionally, we accounted for the effect of temperature enhanced biogenic emission increase. Several experiments were performed by adding these effects one-by-one to the total impact: i.e., first, only the urban temperature impact was considered driving the chemistry model; secondly, the wind impact was added and so on. We found that the impact on biogenic emission account for minor changes in the concentrations of ozone (O3), oxides of nitrogen NOx = NO + NO2 and nitric acid (HNO3). On the other hand, the dominating component acting is the increased vertical mixing, resulting in up to 5 ppbv increase of urban ozone concentrations while causing −2 to −3 ppbv decreases and around 1 ppbv increases of NOx and HNO3 surface concentrations, respectively. The temperature impact alone results in reduction of ozone, increase in NO, decrease in NO2 and increases of HNO3. The wind impact leads, over urban areas, to ozone decreases, increases of NOx and a slight increase in HNO3. The overall impact is similar to the impact of increased vertical mixing alone. The Process Analysis (PA) technique implemented in CAMx was adopted to investigate the causes of the modeled impacts in more details. It showed that the main process contributing to the temperature impact on ozone is a dry-deposition enhancement, while the dominating process controlling the wind impact on ozone over cities is the advection reduction. In case of the impact of enhanced turbulence, PA suggests that ozone increases are, again as assumed, the result of increased downward vertical mixing supported by reduced chemical loss. Comparing the model concentrations with measurements over urban areas, a slight improvement of the model performance was achieved during afternoon hours if urban canopy forcing on chemistry via meteorology was accounted for. The study demonstrates that disregarding the urban canopy induced meteorological effects in air-quality oriented modeling studies can lead to erroneous results in the calculated species concentrations. However, it also shows that the individual components are not equally important: urban canopy induced turbulence effects dominate while the wind-speed and temperature related ones are of considerably smaller magnitude. © 2017 Elsevier Ltd |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/83051
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Department of Atmospheric Physics, Faculty of Mathematics and Physics, Charles University, Prague, V Holešovičkách 2, Prague 8, Czech Republic
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| Recommended Citation: | |
Huszár P,, Karlický J,, Belda M,et al. The impact of urban canopy meteorological forcing on summer photochemistry[J]. Atmospheric Environment,2018-01-01,176
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