Van de Walle, J;
Brousse, O;
Arnalsteen, L;
Byarugaba, D;
Ddumba, DS;
Demuzere, M;
Lwasa, S;
... van Lipzig, NPM; + view all
(2021)
Can local fieldwork help to represent intra-urban variability of canopy parameters relevant for tropical African climate studies?
Theoretical and Applied Climatology
10.1007/s00704-021-03733-7.
(In press).
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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.
| Type: | Article |
|---|---|
| Title: | Can local fieldwork help to represent intra-urban variability of canopy parameters relevant for tropical African climate studies? |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/s00704-021-03733-7 |
| Publisher version: | https://doi.org/10.1007/s00704-021-03733-7 |
| Language: | English |
| Additional information: | © The Author(s) 2021.This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Science & Technology, Physical Sciences, Meteorology & Atmospheric Sciences, 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 |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10133864 |
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