Urban-Rural Comparison of Sensible and Latent Heat Fluxes Using Eddy Covariance Measurements
This topic is under the 4TU Heritage Project carried out by UTwente together with Universities from Delft, Wageningen and Eindhoven.
Urban areas experience unique microclimatic conditions due to the alteration of land surface characteristics, increased impervious surfaces, and anthropogenic heat sources. These factors lead to the urban heat island (UHI) effect, which influences energy balance components such as sensible (H) and latent heat fluxes (LE). While rural areas exhibit energy exchanges driven by natural processes like soil moisture and vegetation transpiration, urban fluxes are modulated by surface materials, urban morphology, and human activity.
This thesis aims to compare the sensible and latent heat fluxes measured from an urban eddy covariance (EC) tower with those from a rural EC station. By analyzing flux differences under varying weather conditions, especially during heatwave events, the project will provide insights into the thermal behavior of urban landscapes and their implications for urban planning and climate adaptation strategies. Additionally, there is a possibility of comparing these results with 3D weather model (see Figure 1) of the urban and rural environments to enhance the understanding of flux dynamics.
- Quantify the differences in sensible and latent heat fluxes between urban and rural sites.
- Identify the role of surface characteristics and weather conditions (e.g., cloud-free, heatwave days) in driving flux difference.
- Evaluate the potential of flux measurements to inform urban climate models and support the development of 3D weather models of urban areas.
Methods
- Long-term flux observations from Eddy covariance towers will be processed using Python to remove spikes, fill gaps, and ensure quality control
- Perform statistical analysis to compare fluxes between sites, using diurnal cycles, averages, and weather condition categories
- Possibly run weather models (WRF/PALM) and obtain sensible and latent heat fluxes and compare the results with the observations
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Feigenwinter C, Vogt R, Christen A. Eddy covariance measurements over urban areas. Eddy covariance: A practical guide to measurement and data analysis. 2012:377-97.
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Lietzke B, Vogt R, Young DT, Grimmond CS. Physical fluxes in the urban environment. InUnderstanding urban metabolism 2014 Aug 27 (pp. 29-44). Routledge.