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UP: Fachverband Umweltphysik
UP 4: Atmospheric Chemistry 1
UP 4.1: Hauptvortrag
Dienstag, 17. März 2020, 14:50–15:20, HSZ 105
Capturing Spatial and Temporal Patterns of NO2 in Cities using mobile and stationary DOAS measurements. — •Mark Wenig1, Sheng Ye1, Ying Zhu1, Jia Chen2, Florian Dietrich2, Xiao Bi2, and Ka Lok Chan3 — 1Meteorologisches Institut, Ludwig-Maximilinas-Universität München — 2Fakultät für Elektrotechnik und Informationstechnik, Technische Universität München — 3Institut für Methodik der Fernerkundung, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
The problem of elevated NO2 levels in cities has gained some attention in the public and science in recent years. Urban air quality is typically monitored using a relatively small number or monitoring stations. Those in-situ measurements follow certain guidelines in terms of inlet height and location relative to streets, but the question remains how a limited number of point measurements can capture the spatial variability in cities. In this talk we present two measurement campaigns in Hong Kong and Munich where we utilized a combination of mobile in-situ and stationary remote sensing differential optical absorption spectroscopy (DOAS) instruments. We developed an algorithm to separate spatial and temporal patterns in order to generate pollution maps that represent average NO2 exposure. We use those maps to identify pollution hot spots and capture the weekly cycles of on-road NO2 levels and spatial dependency of long-term changes.