Atabakhsh Samira, Poulain Laurent, Pöhlker Mira, Fomba Khanneh Wadinga, Herrmann Hartmut
Atmospheric Chemistry Department (ACD), Leibniz Institute for Tropospheric Research (TROPOS), Leipzig 04318, Germany.
Atmospheric Microphysics Department (AMP), Leibniz Institute for Tropospheric Research (TROPOS), Leipzig 04318, Germany.
ACS EST Air. 2025 Jul 30;2(8):1725-1737. doi: 10.1021/acsestair.5c00126. eCollection 2025 Aug 8.
Submicron particles (PM) play a crucial role in air quality and human health. This study investigates the influence of long-range transport (LRT) on urban aerosol levels in Leipzig, Germany, using high-resolution aerosol mass spectrometry measurements at two sites: an urban traffic site (Eisenbahnstrasse, Eiba) and a rural background site (Melpitz), located ∼50 km apart. The sites were analyzed during winter 2017 under two dominant wind regimes: East and West. These sites were directly linked to each other, which was supported by cross-correlation analysis, with a typical time lag of -2 h in East and +4 h in West. Eastern winds brought higher concentrations (Melpitz: 35.50 μg m, Eiba: 37.47 μg m), while Western winds led to cleaner conditions. After being corrected for time lag, the Urban Increment (UI) was estimated, showing that during Eastern wind, only ∼9% of PM mass measured at Eiba was attributed to urban sources, highlighting the dominant contribution of regionally transported aerosol. Furthermore, source apportionment of organic aerosol (OA) identified five major factorsthree primary OA and two oxygenated OAat both sites. The findings underscore the significant role of regional pollution in shaping urban air quality and the need for cross-border emission reduction strategies.
亚微米颗粒物（PM）在空气质量和人类健康中起着至关重要的作用。本研究利用在两个地点进行的高分辨率气溶胶质谱测量，调查了长距离传输（LRT）对德国莱比锡城市气溶胶水平的影响：一个城市交通站点（Eisenbahnstrasse，Eiba）和一个农村背景站点（Melpitz），两者相距约50公里。在2017年冬季，在两种主要风况下对这些站点进行了分析：东风和西风。通过互相关分析支持了这些站点之间的直接联系，东风情况下典型时间滞后为-2小时，西风情况下为+4小时。东风带来更高的浓度（Melpitz：35.50μg/m，Eiba：37.47μg/m），而西风导致更清洁的条件。在对时间滞后进行校正后，估算了城市增量（UI），结果表明在东风期间，Eiba测量的PM质量中只有约9%归因于城市源，突出了区域传输气溶胶的主要贡献。此外，有机气溶胶（OA）的源解析在两个站点都确定了五个主要因素——三个一次OA和两个氧化OA。这些发现强调了区域污染在塑造城市空气质量方面的重要作用以及跨境减排战略的必要性。
