No full text
Poster (Scientific congresses and symposiums)
DOAS measurements of NO2 and H2CO at Kinshasa and Comparisons with Satellites Observations
Yombo Phaka, Rodriguez; Merlaud, Alexis; Pinardi, Gaia et al.
2020European Geosciences Union 2020
 

Files


Full Text
No document available.
Full Text Parts
POSTER_EGU_2020_RODRIGUEZ_YOMBO.pdf
Author postprint (1.36 MB)
Poster Session AS5.13 EGU General Assembly 2020
Download
EGU_2020_ABSTRACT.pdf
Publisher postprint (300.08 kB)
ABSTRACT_EGU_2020
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
DOAS; NO2; Kinshasa
Abstract :
[en] Africa experiences a fast urban inhabitants growth, caused by the largest population boom in the world, combined with rural exodus. Many cities are heavily affected by air pollution. It is therefore essential to monitor the concentrations of the various polluting species such as NO2, HCHO, O3 and aerosols, which have a direct impact on the population health. The sources of pollutant in Africa are different from those found in Europe. For example, forest fires and household cooking largely contribute to the NO2 and HCHO burdens in Central Africa. However, many large African cities, such as the City of Kinshasa, capital of the Democratic Republic of Congo, do not have atmospheric measurement instruments. In order to tackle the lack of measurements in Kinshasa, the Royal Belgian Institute of Space Aeronomy (BIRA-IASB) has, in collaboration with the University of Kinshasa (UniKin), installed an optical remote sensing instrument on the UniKin site (-4.42°S, 15.31°E). Installed in May 2017, the instrument has been in operation until today and provides data to measure the column amounts of several polluting species in the atmosphere of Kinshasa. The instrument is based on a compact AVANTES spectrometer covering the spectral range 290 - 450 nm with 0.7 nm resolution. The spectrometer is a Czerny-Turner type with an entry slit of 50 μm wide, and an array of 1200 l/mm. A 10 m long and 600 μm diameter optical fiber is connected to the spectrometer to receive the incident light beam from the sky. Measurements were mainly made by looking in a fixed direction until November 2019. Since then, a Multi-Axis geometry (MAX-DOAS) has been implemented. The measurements provided by this DOAS instrument allowed us to start studying the atmosphere of Kinshasa using the QDOAS software, which allows us to find the oblique columns of different observed species. This poster will present the instrument, the database and the procedure used to convert these oblique columns into vertical columns, using the air mass factors calculated with the radiative transfer model. We also present our first MAX-DOAS results, analyzed using the retrieval tools of the ESA FRM4DOAS project. The study of current results clearly shows the signature of polluting species such as NO2, HCHO in the atmosphere of Kinshasa. We also use simulations by the GEOS-Chem chemistry transport model to evaluate the magnitude of the emissions needed to explain the observed column amounts. These observations made in Kinshasa could contribute to the validation of satellite products and the refinement of models. We present a first comparison of Kinshasa's ground-based observations with those of the OMI and TROPOMI satellites
Research center :
ULiège, GIRPAS, Institute of Astrophysics and Geophysics
Disciplines :
Earth sciences & physical geography
Author, co-author :
Yombo Phaka, Rodriguez ;  Université de Liège - ULiège > SPHERES
Merlaud, Alexis
Pinardi, Gaia
Fayt, Caroline
Friedrich, Martina
Hendrick, François
Lars, Jacob
Van Roozendael, Michel
Mahieu, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Bopili Lepiba Mbotia, Richard
Mbungu Tsumbu, Jean-Pierre
Language :
English
Title :
DOAS measurements of NO2 and H2CO at Kinshasa and Comparisons with Satellites Observations
Publication date :
04 April 2020
Number of pages :
A0
Event name :
European Geosciences Union 2020
Event organizer :
European Geosciences Union
Event place :
Vienne, Austria
Event date :
du 04 Mai 2020 au 08 mai 2020
Audience :
International
Name of the research project :
Emissions biogéniques dans le bassin du Congo, impact sur la qualité de l'air en Afrique Centrale et sur la validation de l'instrument Tropomi à bord du satellite SP5
Funders :
ULG/PACODEL
Available on ORBi :
since 05 May 2020

Statistics


Number of views
105 (5 by ULiège)
Number of downloads
96 (3 by ULiège)

OpenCitations
 
0

Bibliography


Similar publications



Contact ORBi