Télédétection de la pollution en dioxyde d'azote et en formaldéhyde dans l’atmosphère de Kinshasa à partir d'une station de mesure des polluants atmosphériques
Yombo Phaka, R.
Van Roozendael, M.
Earth and related Environmental sciences
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We present in this article the fruit ofa collaborative effort between the University of Kinshasa through the Department of Physics of the Faculty of Sciences and the UV-Visible group of the Royal Belgian Institute for Space Aeronomy (BIRA-IASB). This collaboration in its first phase resulted in the installation of an optical remote sensing instrument for measuring air pollutants in the Kinshasa atmosphere. Kinshasa, the capital of the Democratic Republic of Congo "DRC", the third largest city in Africa with about 10 million inhabitants, is the source of significant emissions from various pollutants. In this study, we use a remote sensing instrument to measure the abundance of two important gaseous pollutants: dioxide (NO2) and formaldehyde (H2CO) present in the Kinshasa atmosphere. The deployed equipment is based on a commercial grating spectrometer covering the spectral range from 290 to 450 nm, and connected by an optical fiber to record the sky light. A GPS system is integrated into the instrument, allowing for mobile measurements from a vehicle. The control of all the interconnected modules is ensured by a computer running Windows. The different measurements made by the equipment are analyzed and processed by the DOAS "Differential Optical Absorption Spectroscopy" technique. Since the installation of this station in May 2017, we .have been able to build a database of several months of measurements that we use to look for trace gas concentrations. Results are analysed for tropospheric NO2 and H2CO signals as well as for stratospheric NO2, the latter being identified in twilight measurements. The system is also shown to allow for stratospheric ozone detection.
CitationYombo Phaka, R.; Pinardi, G.; Merlaud, A.; Fayt, C.; Van Roozendael, M.; Mbungu, J.-P. (2019). Télédétection de la pollution en dioxyde d'azote et en formaldéhyde dans l’atmosphère de Kinshasa à partir d'une station de mesure des polluants atmosphériques. , Annales de la Faculté des Sciences de l'Université de Kinshasa, Vol. 1, 11-24,