Evaluation and application of a low-cost measurement network to study intra-urban temperature differences during record summer 2018

Gubler, Moritz Raffael; Brönnimann, Stefan (2020). Evaluation and application of a low-cost measurement network to study intra-urban temperature differences during record summer 2018 [Dataset]. In: Raw data.

[img] Spreadsheet (Raw LCD temperature data of heatwave from 30/07/2018 00:00 to 07/08/2018 23:50)
Gubler_etal_data_heatwave_2018.csv - Additional Metadata
Available under License BORIS Standard License.

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[img] Spreadsheet (Raw LCD and AWS temperature and weather data at of study period from 16/05/2018 00:00 until 15/09/2018 23:50 at the three reference sites)
Gubler_etal_data_reference_measurements.csv - Additional Metadata
Available under License BORIS Standard License.

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The understanding of intra-urban temperature variations is crucial for cities’ adaptation to impacts of present and future anthropogenic climate change. Depending on extensive measurement networks, high-resolution air temperature measurements in urban environments are challenging due to high instrumentation and maintenance costs. Here, we present a low-cost measurement device (LCD) consisting of a temperature logger and a custom made, naturally ventilated radiation shield. Besides inter-comparisons with automated weather stations (AWS) at three reference sites during record-dry summer 2018, we tested the potential using a network of 76 LCD to map the intra-urban variability of urban heat island (UHI) patterns throughout an intense heat wave based in the city of Bern, Switzerland. We found positive mean measurement biases between LCD and AWS of 0.61 to 0.93 K (RMSE: 0.78 to 1.17 K) during daytime, of which up to 82.8% could be explained by radiative heating of solar irradiance and insufficient ventilation by prevailing winds. During night, average measurement biases were markedly lower and eventually negative with -0.12 to 0.23 K (RMSE: 0.19 to 0.34 K). Our results further highlight the importance of sensor inter-comparisons being conducted at multiple locations with differing urban forms given that biases varied considerably between the reference sites. Data retrieved by the city-wide measurement network showed that the LCD approach is well suited for the analysis of spatiotemporal UHI-patterns during night with maximum UHI intensities of up to 5.5 K. In conclusion, the here presented LCD measurement approach represents a valuable option for cost-effective analyses of urban air temperature variability across multiple scales, which may be of particular value for the development, appliance, and monitoring of adaptation strategies to climate change in cities with restricted financial resources.

Item Type:

Dataset

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geography

UniBE Contributor:

Gubler, Moritz Raffael and Brönnimann, Stefan

Subjects:

500 Science > 550 Earth sciences & geology

Funders:

[UNSPECIFIED] Geographisches Institut, Universität Bern

Projects:

[UNSPECIFIED] Urban Climate Bern

Language:

German

Submitter:

Moritz Raffael Gubler

Date Deposited:

03 Apr 2020 09:59

Last Modified:

03 Apr 2020 09:59

Uncontrolled Keywords:

urban heat island, low-cost measurement, radiation shield, Bern

BORIS DOI:

10.7892/boris.140420

URI:

https://boris.unibe.ch/id/eprint/140420

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