Effects of various meteorological conditions and spatial emission resolutions on the ozone concentration and ROG/NOx limitation in the Milan area (I)
Effects of various meteorological conditions and spatial emission resolutions on the ozone concentration and ROG/NOx limitation in the Milan area (I)
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DOI：
10.5194/acp-4-423-2004
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发表时间：
2004-03-17
影响因子：
6.3
通讯作者：
Prevot, ASH
中科院分区：
文献类型：
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作者：
Baertsch-Ritter, N;Keller, J;Prevot, ASH
利用三维光化学模型UAM-V研究了意大利北部波河流域各种气象条件和排放清单粗度对臭氧浓度和臭氧生成ROG/NOx限制的影响。作为基本案例，对 1998 年 5 月 13 日高达 200 ppb 的高臭氧事件进行了建模，并利用大型现场实验期间获得的测量结果进行了彻底评估。气象学的系统变化适用于混合高度、气温、比湿度和风速。通过对 3 x 3 km(2) 至 54 x 54 km(2) 排放网格进行重采样，获得了三个较粗略的排放清单。模型结果表明，气象输入文件的变化强烈影响该地区的臭氧。例如，温度使臭氧峰值变化 10.1 ppb/摄氏度，米兰的臭氧浓度变化 2.8 ppb/摄氏度。意大利北部的净臭氧形成对温度的依赖性比对湿度的依赖性更强，而湿度对于臭氧产生的 ROG/NOx 限制非常重要。对于所有气象变化（例如，混合高度加倍），模拟的臭氧峰值仍然受到 ROG 限制。仅当应用更粗略的排放清单时，才会发现 ROG 限制区域中 NOx 敏感性的强烈变化。随着风速的增加，ROG 限制区域也增加，因为由点源引起的 ROG 限制臭氧化学分布在更大的区域。没有点源的模拟往往会增加氮氧化物的限制区域。
The three-dimensional photochemical model UAM-V is used to investigate the effects of various meteorological conditions and of the coarseness of emission inventories on the ozone concentration and ROG/NOx limitation of the ozone production in the Po Basin in the northern part of Italy. As a base case, the high ozone episode with up to 200 ppb on 13 May 1998 was modelled and previously thoroughly evaluated with measurements gained during a large field experiment. Systematic variations in meteorology are applied to mixing height, air temperature, specific humidity and wind speed. Three coarser emission inventories are obtained by resampling from 3 x 3 km(2) up to 54 x 54 km(2) emission grids. The model results show that changes in meteorological input files strongly influence ozone in this area. For instance, temperature changes peak ozone by 10.1 ppb/degreesC and the ozone concentrations in Milan by 2.8 ppb/degreesC. The net ozone formation in northern Italy is more strongly temperature than humidity dependent, while the humidity is very important for the ROG/NOx limitation of the ozone production. For all meteorological changes (e.g. doubling the mixing height), the modelled peak ozone remains ROG limited. A strong change towards NOx sensitivity in the ROG limited areas is only found if much coarser emission inventories were applied. Increasing ROG limited areas with increasing wind speed are found, because the ROG limited ozone chemistry induced by point sources is spread over a larger area. Simulations without point sources tend to increase the NOx limited areas.