Land cover change effects on land surface temperature trends in an African urbanizing dryland region

Akinyemi, Felicia O.; Ikanyeng, Mphoentle; Muro, Javier (2019). Land cover change effects on land surface temperature trends in an African urbanizing dryland region. City and environment interactions, 4, p. 100029. Elsevier 10.1016/j.cacint.2020.100029

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Land use-land cover (LULC) association with land surface temperature (LST) is well known. Knowledge about land change effects on LST in urbanizing African drylands is very limited. We examined LST and vegetation variations in semi-arid Gaborone (Botswana's capital) using MODIS daytime and night-time LST (DNLST), and Normalized Difference Vegetation Index (NDVI) between 2000 and 2018. Significant land transitions were identified in the land cover change map using Change Vector Analysis of Landsat-based biophysical indices of vegetation, water and bare soil. Artificial surface and tree-covered areas were net gaining categories, whereas cropland and grassland were net losing categories. Detailed profiling of DNLST trends and breakpoints was conducted in five relatively homogenous sites representing land cover/transitions. Increasing NDVI and DNLST trends found were significant. Per class, LST change at daytime and night-time are as follows: built-up areas (1.8 K, 2.2 K), Gaborone dam (5.7 K, 0.2 K), settlement expansion areas (4.6 K, 2.2 K), and rural settlement (2.0 K, 1.5 K). The cooling effect of irrigation on daytime LST was higher than night-time LST as daytime LST trend as low as −0.4 K was found in areas of irrigated croplands. Validation with synoptic station temperature data and dam water levels provides empirical evidence that MODIS gave credible DNLST estimates in this urbanizing dryland area. Our results also suggest the role of climate variability in urbanizing drylands alongside land cover change in controlling the LST. Regardless, coupling DNLST and land cover changes can provide useful information for spatial planning of drylands to create smart cities that are resilient to climate change.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Geographies of Sustainability > Unit Land Systems and Sustainable Land Management (LS-SLM)
08 Faculty of Science > Institute of Geography > Geographies of Sustainability
08 Faculty of Science > Institute of Geography

UniBE Contributor:

Akinyemi, Felicia Olufunmilayo

Subjects:

900 History > 910 Geography & travel

ISSN:

2590-2520

Publisher:

Elsevier

Language:

English

Submitter:

Felicia Olufunmilayo Akinyemi

Date Deposited:

10 Feb 2021 12:29

Last Modified:

11 Mar 2021 08:30

Publisher DOI:

10.1016/j.cacint.2020.100029

Uncontrolled Keywords:

Land use, Land surface temperature (LST), Normalized Difference Vegetation Index (NDVI), Drylands, Peri-urbanization, Seasonal trend model, Small and medium-sized cities

BORIS DOI:

10.48350/150924

URI:

https://boris.unibe.ch/id/eprint/150924

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