From Green to Grey: Exploring Land Cover Transformation and Urban Heat Island Dynamics in Greater Accra, Ghana
DOI:
https://doi.org/10.36777/jag2052.4.2.3Keywords:
Urban Heat Island, Land Cover Change, Land Surface Temperature, Greater Accra, UrbanisationAbstract
Urban heat intensification remains a pressing environmental challenge in rapidly growing African cities, yet limited empirical data exist on its spatio-temporal evolution. This study assessed land surface temperature (LST) and Urban Heat Island (UHI) dynamics in the Greater Accra Region between 2010 and 2024 using multi-temporal Landsat imagery, supervised classification, and geospatial analysis in ArcGIS and ENVI. Land cover changes were quantified, and UHI zones were mapped to evaluate the relationship between urbanisation and thermal patterns. Results revealed that built-up areas expanded by approximately 67,850 ha, while vegetation cover declined by over 45%, leading to a marked intensification of UHI. In 2010, UHI values ranged from 2.55 °C to 15.10 °C, rising sharply to 9.20 °C–25.70 °C by 2024, with high-intensity zones covering more than 70% of the landscape. Town-level analysis further indicated that mean LST values exceeded 34 °C in dense urban cores, such as Accra Central and Madina, compared to values below 27 °C in peri-urban and water-adjacent areas. The persistence of cooling effects near water bodies and green clusters highlights their mitigating influence, although their spatial extent continues to shrink. These findings demonstrate that uncontrolled urban expansion directly amplifies surface heating, posing risks to thermal comfort, energy demand, and public health. The novelty of this research lies in its multi-temporal quantification of UHI escalation over 14 years in Accra, providing robust evidence for integrating vegetation restoration, green roofs, and sustainable urban design into planning. Future studies should refine predictive models and incorporate socio-economic variables to strengthen climate resilience strategies.
References
Aninakwah Isaac, A., Adu-Boahen, K., Edoh, N., & Aninakwah, E. (2024). Analysis of trends in land utilisation and land cover dynamics in the Kwahu West Municipality, Ghana. Journal of Asian Geography, 3(1), 44–53. https://doi.org/10.36777/jag2024.3.1.6
Aninakwah, E., & Aninakwah Isaac, A. (2025). Assessing the impacts of urban sprawl and encroachment on the Muni-Pomadze Lagoon ecosystem at Winneba, Ghana. SN Social Sciences, 5, Article 61. https://doi.org/10.1007/s43545-025-01092-y
Aninakwah, E., Aninakwah Isaac, A., & Okyere, E. Y. (2025). Quantitative analysis of plastic waste accumulation in coastal Ghana: Implications for waste management. Communication in Physical Sciences, 12(2), 808–822. https://doi.org/10.4314/cps.v12i2.11
Asori, M., & Adu, P. (2023). Modelling the impact of the future state of land use land cover change patterns on land surface temperatures beyond the frontiers of Greater Kumasi: A coupled cellular automaton (CA) and Markov chain. Remote Sensing Applications: Society and Environment, 29, 100967. https://doi.org/10.1016/j.rsase.2023.100967
Asori, M., & Appiah, D. (2022). Land use/cover change and urban sprawl in Ghana. SSRN. https://doi.org/10.2139/ssrn.4018888
Athukorala, D., & Murayama, Y. (2020). Spatial variation of land use/cover composition and impact on surface urban heat island in a tropical sub-Saharan city of Accra, Ghana. Sustainability, 12(19), 7953. https://doi.org/10.3390/su12197953
Biney, E., Kwabena, E., Poku-Boansi, M., Hackman, K. O., Harris, E., Mensah, Y., Buston, D., Annan, E., & Elikplim, A. (2024). Analysing the spatio-temporal pattern of urban growth and its influence on urban heat islands in the Sekondi-Takoradi metropolis, Ghana. Scientific African, 26, e02366. https://doi.org/10.1016/j.sciaf.2024.e02366
Biney, G. A., Darkwah, A. L., & Owusu, G. (2024). Urban expansion and land cover transitions in rapidly growing cities: Evidence from Accra, Ghana. Sustainability, 16(4), 2125. https://doi.org/10.3390/su16042125
Borsah, A. A., Boah, E. A., & Brantson, E. T. (2025). Spatio-temporal land use/land cover change analysis and assessment of urban heat island in Ghana: A focus on the Greater Accra Region. Journal of African Earth Sciences, 221, 105474. https://doi.org/10.1016/j.jafrearsci.2024.105474
Borsah, F. O., Ansah, A. S., & Opoku, P. (2025). Mapping urban land cover dynamics and heat island effects in West Africa. Environmental Monitoring and Assessment, 197(3), 112. https://doi.org/10.1007/s10661-025-12245-1
Buo, I. N. K. (2019). Urban sprawl dynamics and urban heat islands (UHI) in Ghana (Master’s thesis). University of Tartu.
Devendran, A. A., & Banon, F. (2022). Spatio-temporal land cover analysis and the impact of land cover variability indices on land surface temperature in Greater Accra, Ghana, using multi-temporal Landsat data. Journal of Geographic Information Systems, 14(3), 240–258. https://doi.org/10.4236/jgis.2022.143013
Frimpong, B. F., Koranteng, A., & Opoku, F. S. (2023). Analysis of urban expansion and its impact on temperature utilising remote sensing and GIS techniques in the Accra Metropolis in Ghana (1986–2022). SN Applied Sciences, 5(8), 910. https://doi.org/10.1007/s42452-023-05439-z
Gyasi-Addo, J. A. (2021). Evaluation of the effect of urbanisation on urban thermal behaviour using urban heat island indicators: The case of the CBD of Accra (Doctoral dissertation).
Gyasi-Addo, J., & Bennadji, A. (2020). A procedure for assessing UHI intensity in the central business district of Accra. Journal of Scientific Research and Reports, 26(5), 42–61. https://doi.org/10.9734/JSRR/2020/v26i530259
Hawley, A. H. (1950). Human ecology: A theory of community structure. Ronald Press.
Mensah, C., Atayi, J., Kabo-Bah, A. T., Švik, M., Kyere-Boateng, R., Prempeh, N. A., & Marek, M. V. (2020). Impact of urban land cover change on the garden city status and land surface temperature of Kumasi. Cogent Environmental Science, 6(1), 1787738. https://doi.org/10.1080/23311843.2020.1787738
Oke, T. R. (1982). The energetic basis of the urban heat island. Quarterly Journal of the Royal Meteorological Society, 108(455), 1–24.
Park, R. E., Burgess, E. W., & McKenzie, R. D. (1925). The city. University of Chicago Press.
Reagan, R., Agyepong, R., Morgan, E., Barimah, A., & Kofi, E. (2023). Trading greens for heated surfaces: Land surface temperature and perceived health risk in Greater Accra Metropolitan Area, Ghana. Egyptian Journal of Remote Sensing and Space Sciences, 26(4), 861–880. https://doi.org/10.1016/j.ejrs.2023.09.004
Wemegah, C. (2020). Systematic assessment of urban heat island (UHI) warming in Greater Accra Region (Unpublished doctoral dissertation). https://doi.org/10.13140/RG.2.2.11121.51040
Wemegah, C. S., Yamba, E. I., Aryee, J. N. A., Sam, F., & Amekudzi, L. K. (2020). Assessment of urban heat island warming in the Greater Accra Region. Scientific African, 8, e00426. https://doi.org/10.1016/j.sciaf.2020.e00426
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