The Urban Heat Island Intensity of Paris: A Case Study Based on a Simple Urban Surface Parametrization |
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Authors: | Abhijit Sarkar Koen De Ridder |
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Institution: | (1) Tohoku University of Community Service and Science, 3-5-1 Iimoriyama, Sakata, Yamagata 998-8580, Japan;(2) National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan, ROC;(3) Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan |
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Abstract: | We explore the ability of a simple urban surface parametrization, embedded in a mesoscale meteorological model, to correctly
reproduce observed values of the urban heat island (UHI) intensity, which is defined as the urban-rural surface air temperature
difference. To do so, a simple urban scheme was incorporated into the Advanced Regional Prediction System (ARPS). Subsequently,
a simulation was performed with the coupled model over the wider area of Paris, for a 12-day period in June 2006 that was
characterised by conditions prone to UHI development. Simulated 2-m air temperature was compared with observed values for
urban and rural stations, yielding mean errors of 1.4 and 1.5 K, respectively. More importantly, it was found that the model
also displayed an overall good capability of reproducing the observed temperature differences. In particular, the magnitude (up to 6 K) and timing of the diurnal cycle of the UHI intensity was simulated well, the model
exhibiting a mean error of 1.15 K. As a result, our conclusion is that the ARPS model, extended with simple urban surface
physics, is able to capture observed urban-rural air temperature differences well, at least for the domain and period studied. |
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