Evaluation of the GRAMM/GRAL model for high-resolution wind fields in Heidelberg, Germany
Independent verification of mitigation efforts for climate and air quality action in cities relies on inferring emissions from atmospheric concentration measurements. As emissions are dispersed in the atmosphere before they reach an instrument, the quantitative estimation of emissions requires an un...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
15 April 2024
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| In: |
Atmospheric research
Year: 2024, Jahrgang: 300, Pages: 1-16 |
| ISSN: | 0169-8095 |
| DOI: | 10.1016/j.atmosres.2023.107207 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1016/j.atmosres.2023.107207 Verlag, kostenfrei, Volltext: https://www.sciencedirect.com/science/article/pii/S016980952300604X 
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| Verfasserangaben: | Maximilian May, Simone Wald, Ivo Suter, Dominik Brunner, Sanam N. Vardag |
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| 245 | 1 | 0 | |a Evaluation of the GRAMM/GRAL model for high-resolution wind fields in Heidelberg, Germany |c Maximilian May, Simone Wald, Ivo Suter, Dominik Brunner, Sanam N. Vardag |
| 264 | 1 | |c 15 April 2024 | |
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| 500 | |a Gesehen am 13.06.2024 | ||
| 520 | |a Independent verification of mitigation efforts for climate and air quality action in cities relies on inferring emissions from atmospheric concentration measurements. As emissions are dispersed in the atmosphere before they reach an instrument, the quantitative estimation of emissions requires an understanding of the atmospheric transport and associated uncertainties. In this study, we analyse the catalogue of steady-state flow fields generated by the Graz Mesoscale Model (GRAMM) coupled to the Graz Lagrangian Model (GRAL) for an entire year in Heidelberg, Germany. We use a loss function for the wind field selection, which assigns a best-matching catalogue entry to any given hour by exploiting observation data. We introduce a new loss function which finds an optimal balance between differences in wind speed and wind direction. We evaluate the performance of the model based on 15 meteorological measurement sites, of which 14 are in the inner high-resolution and building-resolving GRAL domain (12.5 km × 12.5 km, 10 m resolution). Performance metrics include mean bias (MB) and root mean square errors (RMSEs) of simulated and observed wind speed and wind direction for all individual stations. On average, we find a mean underestimation of wind speed of 0.14 ms−1 corresponding to about 7 % of the mean wind speed and a mean RMSE of 1.03 ms−1. For wind direction, a mean overall bias smaller than 1° is achieved, but individual stations show larger biases (mean absolute bias: 37°), especially at stations where wind speeds are low on average. Evaluation benchmarks for mean biases of wind direction and wind speed of mesoscale models provided by the European Environmental Agency (EEA) are met at 11 and 14 out of 15 stations at low measurement heights, respectively. Recently suggested extended benchmarks for complex terrain are met at almost all stations. Additionally, for the first time, we analyse the model's ability to simulate the vertical wind profile and we analyse the benefit of implementing a wind profile measurement into the process. We find that the model does not fully capture the vertical profile in our setting. We further study the required measurement network size and find that a high number (> 6) of meteorological stations improves the selection of flow fields over the entire GRAL domain substantially. The conducted comprehensive analysis of the wind fields in the GRAL domain are the basis for detailed quantitative analysis of greenhouse gas and air pollutant emissions using the GRAMM/GRAL modelling framework. | ||
| 650 | 4 | |a High-resolution simulation | |
| 650 | 4 | |a Urban atmospheric transport | |
| 650 | 4 | |a Urban meteorology | |
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| 700 | 1 | |a Suter, Ivo |e VerfasserIn |4 aut | |
| 700 | 1 | |a Brunner, Dominik |e VerfasserIn |4 aut | |
| 700 | 1 | |a Vardag, Sanam Noreen |e VerfasserIn |0 (DE-588)106269189X |0 (DE-627)805632557 |0 (DE-576)420010696 |4 aut | |
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