Constant volume balloons measurements in the urban Marseille and Fos–Berre industrial ozone plumes during ESCOMPTE experiment
Constant volume balloons measurements in the urban Marseille and Fos–Berre industrial ozone plumes during ESCOMPTE experiment
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ESCOMPTE 实验期间马赛市区和 Fos-Berre 工业臭氧羽流中的定容气球测量
DOI：
10.1016/j.atmosenv.2008.03.011
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发表时间：
2008
影响因子：
5
通讯作者：
P. Durand
中科院分区：
文献类型：
--
作者：
B. Bénech;A. Ezcurra;M. Lothon;F. Saïd;B. Campistron;F. Lohou;P. Durand
ESCompte方案旨在研究工业和城市地区主要污染物的排放及其在大气中的迁移、扩散和转化。这项实验在法国东南部进行，可用于验证和改进气象和化学中尺度模型。该实验的一个主要目标是跟踪污染物羽流，并研究其热力学和物理化学时间演变。这是通过由全球定位卫星定位并配备有热力学和臭氧传感器的定容气球以恒定密度水平飞行来实现的。在2000年和2001年6月和7月进行的两次ESCCOMPTE活动期间，共发射了40个气球，其中17个气球在协调世界时0800至1800的白天装有臭氧传感器。在西北风（偏北天气流）和海风（偏南微风）条件下，黄蜂的飞行高度在400米至1200米之间。实验区域的大气边界层（ABL）地形复杂，每天变化很大。其深度在ESCOMPTE域内呈现出从海岸到北部的大梯度，域内变化也较为复杂。气球的轨迹描述了Fos-Berre工业区或马赛市区排放的污染物羽流的演变。定容气球可以很好地描述这两个羽流的轨迹。在等冰层上飞行的气球穿越不同的大气层，主要取决于与定容气球飞行层有关的大气边界层高度。因此，每个气球飞行被分解成对应于相同大气层的不同段。在每一段中，臭氧含量的变化进行了分析，与其他物理参数测量的气球，主要是蒸汽混合比的内容。在ESCompte活动期间，发现大气边界层顶部的化学臭氧净产生的平均线性速率约为6ppbh−1。
ESCOMPTE programme aims at studying the emissions of primary pollutants in industrial and urban areas, their transport, diffusion and transformation in the atmosphere. This experiment, carried out in southeast France, can be used to validate and to improve meteorological and chemical mesoscale models. One major goal of this experiment was to follow the pollutant plumes, and to investigate its thermodynamic and physico-chemical time evolution. This was realized by means of constant volume balloons, located by global position satellite (GPS) and equipped with thermodynamic and ozone sensors, flying at constant density levels. During the two ESCOMPTE campaigns that took place in June and July 2000 and 2001, 40 balloons were launched, 17 of them equipped with ozone sensors during the day from 0800 to 1800 UTC. Balloons’ altitudes flight levels ranged between 400 and 1200m altitude with Mistral (northerly synoptic flow) and Sea Breeze (southerly breeze) conditions. The atmospheric boundary layer (ABL) topography of the experimental domain is complex and varies strongly from day to day. Its depth presents a large gradient from the sea coast to the north part of the ESCOMPTE domain, and also more complex variability within the domain. The balloons’ trajectories describe the evolution of the pollutant plume emitted from the industrial area of Fos-Berre or from the Marseille urban area. Constant volume balloons give a good description of the trajectories of these two plumes. The balloons, which fly at an isopicnic level, cross different atmospheric layers chiefly depending on the ABL height in relation with the constant volume balloons flight level. Thus, each balloon flight is decomposed into different segments that correspond to the same atmospheric layer. In each segment, the ozone content variation is analyzed in relation to other thermodynamical parameters measured by the balloon and mainly to the vapor mixing ratio content. During ESCOMPTE campaign, the mean linear rate of chemical net ozone production at the top of the atmospheric boundary layer was found to be around 6ppbh−1.