Atmospheric composition in the Eastern Mediterranean: Influence of biomass burning during summertime using the WRF-Chem model
Atmospheric composition in the Eastern Mediterranean: Influence of biomass burning during summertime using the WRF-Chem model
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DOI：
10.1016/j.atmosenv.2016.03.011
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发表时间：
2016-05
影响因子：
5
通讯作者：
E. Bossioli;M. Tombrou;J. Kalogiros;J. Allan;A. Bacak;S. Bezantakos;G. Biskos;H. Coe;B. Jones;G. Kouvarakis;N. Mihalopoulos;C. Percival
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文献类型：
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作者：
E. Bossioli;M. Tombrou;J. Kalogiros;J. Allan;A. Bacak;S. Bezantakos;G. Biskos;H. Coe;B. Jones;G. Kouvarakis;N. Mihalopoulos;C. Percival
在爱琴海（AS）的大气成分的影响下，生物质燃烧（BB）活动的“EESTABILITY”爆发期间进行了研究。在爱琴海GAME活动期间（29/8-9/9/2011），使用完全耦合的WRF-Chem模式进行模拟，以检查该地区的BB效应。分析了两种不同输运条件下的湍流流型。估计了在这些条件下离线计算的BB排放对AS上空大气化学成分的影响。此外，灵敏度运行被用来检查的影响，在线计算的生物排放和现实的代表性的平流层-对流层交换过程进行了研究，通过时变化学边界条件的MOZART全球化学输送模式。气体和气溶胶物种的水平和垂直分布的远程传输条件下进行了模拟，并解释有关的行星边界层（PBL）的演变。在天气系统较弱的情况下（中程输送条件），即使有限地区的气象参数有很小的变化，也会对气体和气溶胶的空间分布产生关键影响。BB活动使O3、PM2.5和有机物浓度分别增加到5.5 ppb、5.8 μg m− 3和3.3 μg m−3。通过与空中测量的氰化氢（HCN）进行比较，进一步研究了模拟BB羽流的空间范围。生物源排放对O3和PM2.5浓度的估计影响要么是正的，要么是负的（O3为±6 ppb，PM2.5为± 1 μg m− 3），这取决于所采用的排放算法。化学边界条件的现实表示再现了观察到的层富含O3以上4公里，但也增加了O3浓度内的PBL高达40%。
The composition of the atmosphere over the Aegean Sea (AS) during an ‘Etesian’ outbreak under the influence of biomass burning (BB) activity is investigated. Simulations with the fully coupled WRF-Chem model during the Aegean-GAME campaign (29/8-9/9/2011) are used to examine the BB effect over the region. Two distinct Etesian flow patterns characterized by different transport conditions are analysed. The influence of the off-line calculated BB emissions on the atmospheric chemical composition over the AS under these conditions is estimated. In addition, sensitivity runs are used to examine the influence of the biogenic emissions calculated on-line and the realistic representation of the stratosphere-troposphere exchange processes are investigated through the time-varying chemical boundary conditions from the MOZART global chemical transport model. The horizontal and vertical distributions of gaseous and aerosol species are simulated under long-range transport conditions and interpreted in relation to the evolution of the Planetary Boundary Layer (PBL). In the case of a weaker synoptic system (medium-range transport conditions), even a small variability of meteorological parameters in limited areas become critical for the spatial distribution of gases and aerosols. The BB activity increases O3, PM2.5and organic matter concentrations up to 5.5 ppb, 5.8 μg m−3and 3.3 μg m−3, respectively. The spatial extent of the simulated BB plumes is further examined by comparison with airborne measurements of hydrogen cyanide (HCN). The estimated effect of biogenic emissions on O3and PM2.5concentrations is either positive or negative (±6 ppb for O3and up to ± 1 μg m−3for PM2.5) depending on the emission algorithm employed. The realistic representation of the chemical boundary conditions reproduces an observed layer rich in O3above 4 km, but also increases O3concentrations inside the PBL by up to 40%.