High Resolution Air Quality Forecasting over Prague within the URBI PRAGENSI Project: Model Performance during the Winter Period and the Effect of Urban Parameterization on PM
Abstract
:1. Introduction
2. Methods
2.1. Models and Data
2.1.1. WRF
2.1.2. CAMx
2.1.3. Emissions
2.1.4. Air Quality Stations: Meteorology and Pollutants
2.1.5. PBL Height Retrieval from Ceilometers
2.2. Experimental Setup
2.2.1. Model Configuration
- The “non-urbanized” configuration used the “BULK” (or SLAB) treatment of the urban land-surface. In the BULK treatment, the urban land-surface is regarded as any other flat surface with prescribed surface parameters (roughness, albedo, emissivity, etc.) representing zero-order effects of urban surfaces. It is clear that such an approach cannot fully resolve the 3D nature of the urban weather phenomenon (especially turbulence and radiation in street canyons [58]). The term “non-urbanized” here refers to the fact that these urban effects are largely ignored in the BULK approach. In this setup, there was no connection (restart) between any two successive 12 h runs described above, i.e., WRF adopted the so-called cold start concept [59].
- The “urbanized” configuration of WRF had a more comprehensive treatment of the urban canopy. Instead of the BULK approach, the BEP+BEM urban canopy model was used (cf. 2.1.1). Moreover, significant changes to the land use data were made, resulting in more realistic values of variables describing the urban geometry and physical properties of surfaces (roofs, roads, walls), which influence the exchange between the urban canopy and the atmosphere. Since the state of the urban canopy submodel evolves in time, it was necessary to keep the continuity of its evolution throughout the simulation. Therefore, instead of a cold start as above, a restart was performed each 6 hours with the help of WRF’s restart capability. The restart files produced at the end of a run, needed for the restart of a successive simulation, were enriched with urban variables. Thus, the WRF run mimicked a longer term simulation, driven by analyses and keeping the continuous evolution of the variables that describe the physical state of the urban environment.
2.2.2. Simulated Period
3. Results
3.1. Meteorology
3.2. Air Quality
3.2.1. PM and PM
3.2.2. Analysis of the Aerosol Components
4. Discussion
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A. The Definition of the Statistical Scores
References
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WRF | CAMx |
---|---|
Geographic Projection | |
Lambert Conformal Conic, Center: 50.075 N 14.44 E, True Latitudes: 50.075 N/50.075 N | |
Domains (centered on the projection center) | |
173 × 153 (9 km); 169 × 151 (3 km); 84 × 84 (1 km) as grid points | 172 × 152 (9 km); 164 × 146 (3 km); 74 × 74 (1 km) as grid boxes |
49 vertical levels (up to 50 mbar) | 20 vertical layers (up to 12 km) |
PBL parameterization/vertical diffusivities’ calculation | |
Boulac PBL [37] | CMAQ scheme [46] |
Microphysics scheme/wet deposition | |
Thompson scheme [36] | Seinfeld scheme [43] |
Land surface processes/dry deposition | |
Noah [35] | Zhang scheme [42] |
Radiation/UV-photolysis | |
RRTMG [34] | TUV [61] |
Gas phase chemistry | |
- | CB5 [41] |
Inorganic aerosol chemistry | |
- | ISORROPIA [44] |
Organic aerosol chemistry | |
- | SOAP [45] |
Urban canopy model | |
BULK/BEP + BEM[38,39] | - |
Scheme | T2 (C) | WS (m s) | RH (%) | PBLH (m) | |
---|---|---|---|---|---|
BULK | bias | −1.9 | 1.5 | 3.3 | −229 |
RMSE | 2.7 | 2.4 | 11.5 | 369 | |
r | 0.91 | 0.79 | 0.34 | 0.5 | |
p-value | <0.01 | <0.01 | <0.01 | <0.01 | |
BEP+BEM | bias | 0.6 | 1.3 | −3.2 | −134 |
RMSE | 2.7 | 2 | 11.4 | 322 | |
r | 0.82 | 0.75 | 0.45 | 0.5 | |
p-value | <0.01 | <0.01 | <0.01 | <0.01 |
Scheme | PM | PM | PM Diurnal | PM Diurnal | |
---|---|---|---|---|---|
BULK | bias | 0.06 | −6.7 | −1 | −6.6 |
hourly | RMSE | 36.4 | 28.7 | 12.69 | 8.9 |
r | 0.62 | 0.66 | 0.06 | 0.55 | |
p-value | <0.01 | <0.01 | <0.01 | <0.01 | |
BEP+BEM | bias | −20.1 | −18.3 | −20.2 | −18.3 |
hourly | RMSE | 41 | 35.8 | 21.1 | 18.7 |
r | 0.59 | 0.58 | 0.3 | 0.69 | |
p-value | <0.01 | <0.01 | <0.01 | <0.01 | |
BULK | bias | 0.5 | −6.3 | ||
daily | RMSE | 23.1 | 20.9 | ||
r | 0.8 | 0.8 | |||
p-value | <0.01 | <0.01 | |||
BEP+BEM | bias | −19.7 | −18 | ||
daily | RMSE | 34.5 | 30.5 | ||
r | 0.7 | 0.7 | |||
p-value | <0.01 | <0.01 |
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Ďoubalová, J.; Huszár, P.; Eben, K.; Benešová, N.; Belda, M.; Vlček, O.; Karlický, J.; Geletič, J.; Halenka, T. High Resolution Air Quality Forecasting over Prague within the URBI PRAGENSI Project: Model Performance during the Winter Period and the Effect of Urban Parameterization on PM. Atmosphere 2020, 11, 625. https://doi.org/10.3390/atmos11060625
Ďoubalová J, Huszár P, Eben K, Benešová N, Belda M, Vlček O, Karlický J, Geletič J, Halenka T. High Resolution Air Quality Forecasting over Prague within the URBI PRAGENSI Project: Model Performance during the Winter Period and the Effect of Urban Parameterization on PM. Atmosphere. 2020; 11(6):625. https://doi.org/10.3390/atmos11060625
Chicago/Turabian StyleĎoubalová, Jana, Peter Huszár, Kryštof Eben, Nina Benešová, Michal Belda, Ondřej Vlček, Jan Karlický, Jan Geletič, and Tomáš Halenka. 2020. "High Resolution Air Quality Forecasting over Prague within the URBI PRAGENSI Project: Model Performance during the Winter Period and the Effect of Urban Parameterization on PM" Atmosphere 11, no. 6: 625. https://doi.org/10.3390/atmos11060625