Seasonal and diurnal patterns in the dispersionof SO2 from Mt. Nyiragongo
2016 (English)In: Atmospheric Environment, ISSN 1352-2310, E-ISSN 1873-2844, Vol. 132, 19-29 p.Article in journal (Refereed) Published
Mt. Nyiragongo is an active volcano located in the Democratic Republic of Congo, close to the border of Rwanda and about 15 km north of the city of Goma (similar to 1,000,000 inhabitants). Gases emitted from Nyiragongo might pose a persistent hazard to local inhabitants and the environment. While both ground- and satellite-based observations of the emissions exist, prior to this study, no detailed analysis of the dispersion of the emissions have been made. We have conducted a dispersion study, using a modelling system to determine the geographical distribution of SO2. A combination of a meteorological model (WRF), a Lagrangian particle dispersion model (FLEXPART-WRF) and flux data based on DOAS measurements from the NOVAC-network is used. Since observations can only be made during the day, we use random sampling of fluxes and ensemble modelling to estimate night-time emissions. Seasonal variations in the dispersion follows the migration of the Inter Tropical Convergence Zone. In June-August, the area with the highest surface concentrations is located to the northwest, and in December-February, to the southwest of the source. Diurnal variations in surface concentrations were determined by the development of the planetary boundary layer and the lake-/land breeze cycle around lake Kivu. Both processes contribute to low surface concentrations during the day and high concentrations during the night. However, the strong northerly trade winds in November-March weakened the lake breeze, contributing to higher daytime surface concentrations along the northern shore of Lake Kivu, including the city of Goma. For further analysis and measurements, it is important to include both seasonal and diurnal cycles in order to safely cover periods of high and potentially hazardous concentrations.
Place, publisher, year, edition, pages
2016. Vol. 132, 19-29 p.
Dispersion modelling; Volcanic degassing; Nyiragongo; Sulfur dioxide; FLEXPART-WRF
Earth and Related Environmental Sciences Meteorology and Atmospheric Sciences
Research subject Meteorology
IdentifiersURN: urn:nbn:se:uu:diva-264437DOI: 10.1016/j.atmosenv.2016.02.030ISI: 000374614500003OAI: oai:DiVA.org:uu-264437DiVA: diva2:860333
FunderEU, European Research Council, 18354Sida - Swedish International Development Cooperation Agency, SWE-2008-064Swedish National Infrastructure for Computing (SNIC), p2011191