Academic Journal
Data fusion uncertainty-enabled methods to map street-scale hourly NO2 in Barcelona: a case study with CALIOPE-Urban v1.0
| Title: | Data fusion uncertainty-enabled methods to map street-scale hourly NO2 in Barcelona: a case study with CALIOPE-Urban v1.0 |
|---|---|
| Authors: | A. Criado, J. M. Armengol, H. Petetin, D. Rodriguez-Rey, J. Benavides, M. Guevara, C. Pérez García-Pando, A. Soret, O. Jorba |
| Contributors: | Barcelona Supercomputing Center, Universitat Politècnica de Catalunya. Departament de Mecànica de Fluids, Universitat Politècnica de Catalunya. GReCEF- Grup de Recerca en Ciència i Enginyeria de Fluids |
| Source: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) eISSN Geoscientific Model Development, Vol 16, Pp 2193-2213 (2023) Geoscientific Model Development |
| Publisher Information: | Copernicus GmbH, 2022. |
| Publication Year: | 2022 |
| Subject Terms: | QE1-996.5, NO2 monitoring, Air pollution, Geology, Environmental monitoring, Àrees temàtiques de la UPC::Enginyeria agroalimentària::Ciències de la terra i de la vida, Air quality monitoring stations, Seguiment ambiental, 13. Climate action, Simulació per ordinador, Air quality, 11. Sustainability, Aire--Qualitat, Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Degradació ambiental::Contaminació atmosfèrica, Àrees temàtiques de la UPC::Informàtica, Urban air quality models |
| Description: | Comprehensive monitoring of NO2 exceedances is imperative for protecting human health, especially in urban areas with traffic. However, an accurate spatial characterization of the exceedances is challenging due to the typically low density of air quality monitoring stations and the inherent uncertainties in urban air quality models. We study how observational data from different sources and timescales can be combined with a dispersion air quality model to obtain bias-corrected NO2 hourly maps at the street scale. We present a kriging-based data fusion workflow that merges dispersion model output with continuous hourly observations and uses a machine-learning-based land use regression (LUR) model constrained with past short intensive passive dosimeter campaign measurements. While the hourly observations allow the bias adjustment of the temporal variability in the dispersion model, the microscale LUR model adds information on the NO2 spatial patterns. Our method includes an uncertainty calculation based on the estimated error variance of the universal kriging technique, which is subsequently used to produce urban maps of probability of exceeding the 200 µg m−3 hourly and the 40 µg m−3 annual NO2 average limits. We assess the statistical performance of this approach in the city of Barcelona for the year 2019. Our results show that simply merging the monitoring stations with the model output already significantly increases the correlation coefficient (r) by +29 % and decreases the root mean square error (RMSE) by −32 %. When adding the time-invariant microscale LUR model in the data fusion workflow, the improvement is even more remarkable, with +46 % and −48 % for the r and RMSE, respectively. Our work highlights the usefulness of high-resolution spatial information in data fusion methods to better estimate exceedances at the street scale. |
| Document Type: | Article Other literature type |
| File Description: | application/pdf |
| Language: | English |
| ISSN: | 1991-9603 |
| DOI: | 10.5194/gmd-16-2193-2023 |
| DOI: | 10.5194/egusphere-2022-1147 |
| Access URL: | https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1147/ https://gmd.copernicus.org/articles/16/2193/2023/ https://doaj.org/article/0d88300209544ed495cd4736d62be854 |
| Rights: | CC BY CC BY NC ND |
| Accession Number: | edsair.doi.dedup.....d6cc36f901bcc228eb6abb516caf0581 |
| Database: | OpenAIRE |
| ISSN: | 19919603 |
|---|---|
| DOI: | 10.5194/gmd-16-2193-2023 |