Seasonal and diurnal patterns in the dispersion of SO2 from Mt. Nyiragongo

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Dingwell, AdamUppsala universitet,Luft-, vatten- och landskapslära (author)

Seasonal and diurnal patterns in the dispersion of SO2 from Mt. Nyiragongo

Article/chapterEnglish2016

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Elsevier BV,2016
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LIBRIS-ID:oai:research.chalmers.se:146a7ee1-1c87-4500-9986-772dc3581fd0
https://research.chalmers.se/publication/236284URI
https://doi.org/10.1016/j.atmosenv.2016.02.030DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-264437URI

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Language:English
Summary in:English

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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 (~ 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.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Meteorologi och atmosfärforskning hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Meteorology and Atmospheric Sciences hsv//eng
NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng
Dispersion modelling
FLEXPART-WRF
Volcanic degassing
Nyiragongo
Sulfur dioxide
Meteorology

Added entries (persons, corporate bodies, meetings, titles ...)

Rutgersson, AnnaUppsala universitet,Luft-, vatten- och landskapslära(Swepub:uu)aru27058 (author)
Claremar, BjörnUppsala universitet,Luft-, vatten- och landskapslära(Swepub:uu)bjcar425 (author)
Arellano, Santiago,1981Chalmers tekniska högskola,Chalmers University of Technology,Chalmers, Dept Earth & Space Sci, S-41296 Gothenburg, Sweden(Swepub:cth)arellano (author)
Yalire, M.Observ Volcanol Goma, Goma, DEM REP CONGO (author)
Galle, Bo,1952Chalmers tekniska högskola,Chalmers University of Technology,Chalmers, Dept Earth & Space Sci, S-41296 Gothenburg, Sweden(Swepub:cth)galle (author)
Uppsala universitetLuft-, vatten- och landskapslära (creator_code:org_t)

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In:Atmospheric Environment: Elsevier BV132, s. 19-291873-28441352-2310

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By the author/editor: Dingwell, Adam; Rutgersson, Anna; Claremar, Björn; Arellano, Santia ...; Yalire, M.; Galle, Bo, 1952

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Meteorology and ...

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...

Articles in the publication: Atmospheric Envi ...

By the university: Chalmers University of Technology; Uppsala University

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