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Methane mapping in Greater Accra : Isotopic signatures and mobile detection techniques in a developing urban landscape

The study investigated the comprehensive mapping of methane mole fraction in Greater Accra Region, Ghana. It aims to quantify δ13C-CH4, identify sources, and map methane levels, distinguishing between biogenic and thermogenic sources using isotopic analysis. On average, 300 study sites were spotte...

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Main Authors: Ebenezer Aquisman, Asare, Dickson, Abdul Wahab, Anita, Asamoah, Samuel Boakye, Dampare, Rafeah, Wahi, Elsie Effah, Kaufmann, Zainab, Ngaini, Charles Kofi, Klutse, Nana Ama Browne, Klutse, Archibold, Buah Kwofie, Omolayo Ajoke, Omorinoye
Format: Article
Language:English
Published: Elsevier B.V. 2025
Subjects:
QD Chemistry
Online Access:http://ir.unimas.my/id/eprint/46971/1/Methane%20mapping%20in%20Greater%20Accra%20-%20Copy.pdf
http://ir.unimas.my/id/eprint/46971/
https://www.sciencedirect.com/science/article/pii/S2950357424000362
https://doi.org/10.1016/j.scowo.2024.100036
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spelling my.unimas.ir-469712024-12-23T01:56:29Z http://ir.unimas.my/id/eprint/46971/ Methane mapping in Greater Accra : Isotopic signatures and mobile detection techniques in a developing urban landscape Ebenezer Aquisman, Asare Dickson, Abdul Wahab Anita, Asamoah Samuel Boakye, Dampare Rafeah, Wahi Elsie Effah, Kaufmann Zainab, Ngaini Charles Kofi, Klutse Nana Ama Browne, Klutse Archibold, Buah Kwofie Omolayo Ajoke, Omorinoye QD Chemistry The study investigated the comprehensive mapping of methane mole fraction in Greater Accra Region, Ghana. It aims to quantify δ13C-CH4, identify sources, and map methane levels, distinguishing between biogenic and thermogenic sources using isotopic analysis. On average, 300 study sites were spotted for each district in Greater Accra Region for methane concentrations mapping. A vehicle equipped with a G2201-i isotopic gas analyser was employed for isotopic measurements of δ13C-CH4. The number of samples included in the Keeling plot for the plotting of the regression line in discerning isotopic signatures for the study data ranged from 4 – 19. The HYSPLIT (Hybrid Single Particle Lagrangian Integrated Trajectory) model was applied to help comprehend the dispersion patterns and tracing the origins of detected methane mole fraction in specific areas. Miller–Tans approach was used to estimate the average source signature across the dataset and obtained signature of source mix (‰) of − 30 ± 1 ‰. The highest methane mole fraction was detected in Tema Metropolis, reaching 5.89 ppm with δ13C-CH4 value of − 24 ± 2 ‰. The Accra Metropolis also had elevated methane levels at 5.08 ppm with δ13C-CH4 values of − 24 ± 3 ‰. The isotopic signature of methane mixed-source in Greater Accra, derived using the Miller-Tans plot (-30 ± 1 ‰), indicating combustion and biomass burning emissions. Generally, the methane isotopic values in this region suggest a mix of natural gas leaks, wetlands, landfills, biomass burning, combustion process, and agricultural waste emissions. The data obtained provides a crucial primary representation of methane emissions in the Greater Accra-Region, and West African environment. Elsevier B.V. 2025 Article PeerReviewed text en http://ir.unimas.my/id/eprint/46971/1/Methane%20mapping%20in%20Greater%20Accra%20-%20Copy.pdf Ebenezer Aquisman, Asare and Dickson, Abdul Wahab and Anita, Asamoah and Samuel Boakye, Dampare and Rafeah, Wahi and Elsie Effah, Kaufmann and Zainab, Ngaini and Charles Kofi, Klutse and Nana Ama Browne, Klutse and Archibold, Buah Kwofie and Omolayo Ajoke, Omorinoye (2025) Methane mapping in Greater Accra : Isotopic signatures and mobile detection techniques in a developing urban landscape. Sustainable Chemistry One World, 5. pp. 1-14. ISSN 2950-3574 https://www.sciencedirect.com/science/article/pii/S2950357424000362 https://doi.org/10.1016/j.scowo.2024.100036
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
language English
topic QD Chemistry
spellingShingle QD Chemistry
Ebenezer Aquisman, Asare
Dickson, Abdul Wahab
Anita, Asamoah
Samuel Boakye, Dampare
Rafeah, Wahi
Elsie Effah, Kaufmann
Zainab, Ngaini
Charles Kofi, Klutse
Nana Ama Browne, Klutse
Archibold, Buah Kwofie
Omolayo Ajoke, Omorinoye
Methane mapping in Greater Accra : Isotopic signatures and mobile detection techniques in a developing urban landscape
description The study investigated the comprehensive mapping of methane mole fraction in Greater Accra Region, Ghana. It aims to quantify δ13C-CH4, identify sources, and map methane levels, distinguishing between biogenic and thermogenic sources using isotopic analysis. On average, 300 study sites were spotted for each district in Greater Accra Region for methane concentrations mapping. A vehicle equipped with a G2201-i isotopic gas analyser was employed for isotopic measurements of δ13C-CH4. The number of samples included in the Keeling plot for the plotting of the regression line in discerning isotopic signatures for the study data ranged from 4 – 19. The HYSPLIT (Hybrid Single Particle Lagrangian Integrated Trajectory) model was applied to help comprehend the dispersion patterns and tracing the origins of detected methane mole fraction in specific areas. Miller–Tans approach was used to estimate the average source signature across the dataset and obtained signature of source mix (‰) of − 30 ± 1 ‰. The highest methane mole fraction was detected in Tema Metropolis, reaching 5.89 ppm with δ13C-CH4 value of − 24 ± 2 ‰. The Accra Metropolis also had elevated methane levels at 5.08 ppm with δ13C-CH4 values of − 24 ± 3 ‰. The isotopic signature of methane mixed-source in Greater Accra, derived using the Miller-Tans plot (-30 ± 1 ‰), indicating combustion and biomass burning emissions. Generally, the methane isotopic values in this region suggest a mix of natural gas leaks, wetlands, landfills, biomass burning, combustion process, and agricultural waste emissions. The data obtained provides a crucial primary representation of methane emissions in the Greater Accra-Region, and West African environment.
format Article
author Ebenezer Aquisman, Asare
Dickson, Abdul Wahab
Anita, Asamoah
Samuel Boakye, Dampare
Rafeah, Wahi
Elsie Effah, Kaufmann
Zainab, Ngaini
Charles Kofi, Klutse
Nana Ama Browne, Klutse
Archibold, Buah Kwofie
Omolayo Ajoke, Omorinoye
author_facet Ebenezer Aquisman, Asare
Dickson, Abdul Wahab
Anita, Asamoah
Samuel Boakye, Dampare
Rafeah, Wahi
Elsie Effah, Kaufmann
Zainab, Ngaini
Charles Kofi, Klutse
Nana Ama Browne, Klutse
Archibold, Buah Kwofie
Omolayo Ajoke, Omorinoye
author_sort Ebenezer Aquisman, Asare
title Methane mapping in Greater Accra : Isotopic signatures and mobile detection techniques in a developing urban landscape
title_short Methane mapping in Greater Accra : Isotopic signatures and mobile detection techniques in a developing urban landscape
title_full Methane mapping in Greater Accra : Isotopic signatures and mobile detection techniques in a developing urban landscape
title_fullStr Methane mapping in Greater Accra : Isotopic signatures and mobile detection techniques in a developing urban landscape
title_full_unstemmed Methane mapping in Greater Accra : Isotopic signatures and mobile detection techniques in a developing urban landscape
title_sort methane mapping in greater accra : isotopic signatures and mobile detection techniques in a developing urban landscape
publisher Elsevier B.V.
publishDate 2025
url http://ir.unimas.my/id/eprint/46971/1/Methane%20mapping%20in%20Greater%20Accra%20-%20Copy.pdf
http://ir.unimas.my/id/eprint/46971/
https://www.sciencedirect.com/science/article/pii/S2950357424000362
https://doi.org/10.1016/j.scowo.2024.100036
_version_ 1819914974239129600
score 13.223943

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