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Overview of the synoptic and pollution situation over Europe during the EUCAARI-LONGREX field campaign

机译：EUCAARI-LONGREX野战期间欧洲天气和污染情况概述

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In May 2008 the EUCAARI-LONGREX aircraft field campaign was conducted within the EUCAARI intensive observational period. The campaign aimed at studying the distribution and evolution of air mass properties on a continental scale. Airborne aerosol and trace gas measurements were performed aboard the German DLR Falcon 20 and the British FAAM BAe-146 aircraft. This paper outlines the meteorological situation over Europe during May 2008 and the temporal and spatial evolution of predominantly anthropogenic particulate pollution inside the boundary layer and the free troposphere. Time series data of six selected ground stations are used to discuss continuous measurements besides the single flights. The observations encompass total and accumulation mode particle number concentration (0.1–0.8 μm) and black carbon mass concentration as well as several meteorological parameters. Vertical profiles of total aerosol number concentration up to 10 km are compared to vertical profiles probed during previous studies. During the first half of May 2008 an anticyclonic blocking event dominated the weather over Central Europe. It led to increased pollutant concentrations within the centre of the high pressure inside the boundary layer. Due to long-range transport the accumulated pollution was partly advected towards Western and Northern Europe. The measured aerosol number concentrations over Central Europe showed in the boundary layer high values up to 14 000 cm−3 for particles in diameter larger 10 nm and 2300 cm−3 for accumulation mode particles during the high pressure period, whereas the middle free troposphere showed rather low concentrations of particulates. Thus a strong negative gradient of aerosol concentrations between the well mixed boundary layer and the clean middle troposphere occurred.
机译：2008年5月，在EUCAARI密集观察期内进行了EUCAARI-LONGREX飞机野外运动。该运动旨在研究大陆范围内空气质量特性的分布和演变。在德国DLR Falcon 20和英国FAAM BAe-146飞机上进行了气溶胶和痕量气体的测量。本文概述了2008年5月欧洲的气象情况，以及边界层和对流层内部主要人为颗粒污染的时空演变。除单个飞行外，六个选定地面站的时间序列数据还用于讨论连续测量。观测结果包括总模式和累积模式的颗粒数浓度（0.1-0.8μm）和黑碳质量浓度以及一些气象参数。将高达10 km的总气溶胶数浓度的垂直剖面与先前研究中探测到的垂直剖面进行了比较。 2008年5月上半月，一次反气旋阻塞事件主导了中欧的天气。这导致边界层内部高压中心内的污染物浓度增加。由于远距离运输，累积的污染部分被推向西欧和北欧。在中欧测量的气溶胶浓度在边界层显示出较高的值，对于直径大于10 nm的粒子，累积值最高可达14000 cm -3 ，对于累积而言，其累积值为2300 cm -3 高压期间，颗粒处于高模态，而对流层中层则显示出相当低的颗粒浓度。因此，在充分混合的边界层和干净的对流层之间出现了浓浓的气溶胶负梯度。

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