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Can local fieldwork help to represent intra-urban variability of canopy parameters relevant for tropical African climate studies?

Jonas Van de Walle, Oscar Brousse, Lien Arnalsteen, Disan Byarugaba, Daniel S. Ddumba, Matthias Demuzere (UGent) , Shuaib Lwasa, Gloria Nsangi, Hakimu Sseviiri, Wim Thiery, et al.
(2021) THEORETICAL AND APPLIED CLIMATOLOGY. 146(1-2). p.457-474
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Abstract
Rapid and uncontrolled urbanization in tropical Africa is increasingly leading to unprecedented socio-economical and environmental challenges in cities, particularly urban heat and climate change. The latter calls for a better representation of tropical African cities' properties relevant for urban climate studies. Here, we demonstrate the possibility of collecting urban canopy parameters during a field campaign in the boreal summer months of 2018 for deriving a Local Climate Zone (LCZ) map and for improving the physical representation of climate-relevant urban morphological, thermal and radiative characteristics. The comparison of the resulting field-derived LCZ map with an existing map obtained from the World Urban Data and Access Portal Tool framework shows large differences. In particular, our map results in more vegetated open low-rise classes. In addition, site-specific fieldwork-derived urban characteristics are compared against the LCZ universal parameters. The latter shows that our fieldwork adds important information to the universal parameters by more specifically considering the presence of corrugated metal in the city of Kampala. This material is a typical roofing material found in densely built environments and informal settlements. It leads to lower thermal emissivity but higher thermal conductivity and capacity of buildings. To illustrate the importance of site-specific urban parameters, the newly derived site-specific urban characteristics are used as input fields to an urban parametrization scheme embedded in the regional climate model COSMO-CLM. This implementations decreases the surface temperature bias from 5.34 to 3.97 K. Based on our results, we recommend future research on tropical African cities to focus on a detailed representation of cities, with particular attention to impervious surface fraction and building materials.
Keywords
Fieldwork, Tropical urban climate, Local climate zones, Urban canopy parameters, Urban climate modelling, RURAL-URBAN MIGRATION, SPECTRAL LIBRARY, ENERGY-BALANCE, MODEL, PERFORMANCE, MESOSCALE, SCHEME, KAMPALA, WUDAPT, IMPACT

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MLA
Van de Walle, Jonas, et al. “Can Local Fieldwork Help to Represent Intra-Urban Variability of Canopy Parameters Relevant for Tropical African Climate Studies?” THEORETICAL AND APPLIED CLIMATOLOGY, vol. 146, no. 1–2, 2021, pp. 457–74, doi:10.1007/s00704-021-03733-7.
APA
Van de Walle, J., Brousse, O., Arnalsteen, L., Byarugaba, D., Ddumba, D. S., Demuzere, M., … van Lipzig, N. P. M. (2021). Can local fieldwork help to represent intra-urban variability of canopy parameters relevant for tropical African climate studies? THEORETICAL AND APPLIED CLIMATOLOGY, 146(1–2), 457–474. https://doi.org/10.1007/s00704-021-03733-7
Chicago author-date
Van de Walle, Jonas, Oscar Brousse, Lien Arnalsteen, Disan Byarugaba, Daniel S. Ddumba, Matthias Demuzere, Shuaib Lwasa, et al. 2021. “Can Local Fieldwork Help to Represent Intra-Urban Variability of Canopy Parameters Relevant for Tropical African Climate Studies?” THEORETICAL AND APPLIED CLIMATOLOGY 146 (1–2): 457–74. https://doi.org/10.1007/s00704-021-03733-7.
Chicago author-date (all authors)
Van de Walle, Jonas, Oscar Brousse, Lien Arnalsteen, Disan Byarugaba, Daniel S. Ddumba, Matthias Demuzere, Shuaib Lwasa, Gloria Nsangi, Hakimu Sseviiri, Wim Thiery, Roxanne Vanhaeren, Hendrik Wouters, and Nicole P. M. van Lipzig. 2021. “Can Local Fieldwork Help to Represent Intra-Urban Variability of Canopy Parameters Relevant for Tropical African Climate Studies?” THEORETICAL AND APPLIED CLIMATOLOGY 146 (1–2): 457–474. doi:10.1007/s00704-021-03733-7.
Vancouver
1.
Van de Walle J, Brousse O, Arnalsteen L, Byarugaba D, Ddumba DS, Demuzere M, et al. Can local fieldwork help to represent intra-urban variability of canopy parameters relevant for tropical African climate studies? THEORETICAL AND APPLIED CLIMATOLOGY. 2021;146(1–2):457–74.
IEEE
[1]
J. Van de Walle et al., “Can local fieldwork help to represent intra-urban variability of canopy parameters relevant for tropical African climate studies?,” THEORETICAL AND APPLIED CLIMATOLOGY, vol. 146, no. 1–2, pp. 457–474, 2021.
@article{8742677,
  abstract     = {{Rapid and uncontrolled urbanization in tropical Africa is increasingly leading to unprecedented socio-economical and environmental challenges in cities, particularly urban heat and climate change. The latter calls for a better representation of tropical African cities' properties relevant for urban climate studies. Here, we demonstrate the possibility of collecting urban canopy parameters during a field campaign in the boreal summer months of 2018 for deriving a Local Climate Zone (LCZ) map and for improving the physical representation of climate-relevant urban morphological, thermal and radiative characteristics. The comparison of the resulting field-derived LCZ map with an existing map obtained from the World Urban Data and Access Portal Tool framework shows large differences. In particular, our map results in more vegetated open low-rise classes. In addition, site-specific fieldwork-derived urban characteristics are compared against the LCZ universal parameters. The latter shows that our fieldwork adds important information to the universal parameters by more specifically considering the presence of corrugated metal in the city of Kampala. This material is a typical roofing material found in densely built environments and informal settlements. It leads to lower thermal emissivity but higher thermal conductivity and capacity of buildings. To illustrate the importance of site-specific urban parameters, the newly derived site-specific urban characteristics are used as input fields to an urban parametrization scheme embedded in the regional climate model COSMO-CLM. This implementations decreases the surface temperature bias from 5.34 to 3.97 K. Based on our results, we recommend future research on tropical African cities to focus on a detailed representation of cities, with particular attention to impervious surface fraction and building materials.}},
  author       = {{Van de Walle, Jonas and Brousse, Oscar and Arnalsteen, Lien and Byarugaba, Disan and Ddumba, Daniel S. and Demuzere, Matthias and Lwasa, Shuaib and Nsangi, Gloria and Sseviiri, Hakimu and Thiery, Wim and Vanhaeren, Roxanne and Wouters, Hendrik and van Lipzig, Nicole P. M.}},
  issn         = {{0177-798X}},
  journal      = {{THEORETICAL AND APPLIED CLIMATOLOGY}},
  keywords     = {{Fieldwork,Tropical urban climate,Local climate zones,Urban canopy parameters,Urban climate modelling,RURAL-URBAN MIGRATION,SPECTRAL LIBRARY,ENERGY-BALANCE,MODEL,PERFORMANCE,MESOSCALE,SCHEME,KAMPALA,WUDAPT,IMPACT}},
  language     = {{eng}},
  number       = {{1-2}},
  pages        = {{457--474}},
  title        = {{Can local fieldwork help to represent intra-urban variability of canopy parameters relevant for tropical African climate studies?}},
  url          = {{http://doi.org/10.1007/s00704-021-03733-7}},
  volume       = {{146}},
  year         = {{2021}},
}
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