#1ARPA FVG agenzia Regionale Per La PROTEZione DELL'amBiеnTe DEL FRIULI venezia Giulia istema Nazionale per la Protezione dell'Ambiente Analysis of spatial representativeness in Friuli Venezia Giulia fixed threshold vs uncertainty-dependent threshold Giovanni Bonafè ARPA-FVG#2ARPA FVG exercise per le Protezionale dell'Ambiente pollutants: PM10, NO2, O3 each pollutant considered separately AQ index: annual mean modelled concentration two methods: fixed threshold similarity criterion: concentration in range Cstation ±20% (relative tolerance) ▸ absolute cutoff: concentration in range Cstation ± 2µg/m³ (absolute tolerance) is ok, even if similarity criterion is not satisfied uncertainty-dependent threshold (UDT) similarity criterion: concentration in range Cstation U95 (Cstation) 1 spatial representativeness (SR) region can be discontiguous ► SR region is limited to the IPR AQ zone 1 as described in the Guidance [Janssen et al., 2017] and implemented in R package dartle [Bonafè, 2020] 2022-03-03 G.Bonafè 1/5#3ARPA FVG my choices 2022-03-03 domain: Friuli Venezia Giulia (north-eastern Italy) two models: FARM (chemistry-transport model, 2 km resolution) KED (kriging with external drift, same grid) only background stations periods: 2015-2020 (KED), 2017-2020 (FARM) per le Protezionale dell'Ambiente G.Bonafè 2/5#4spatial representativeness area (km²) 90- model: FARM, period: 2017-2020 NO2 ZON.IT0607 NO2 80 70- 60 50- 40 272- 271-> 270 269 268 200- 100- 03 + 3000 2000 1000 ZON.IT0608 4000 T 3 3 € 03 ZON.IT0607 ZON.IT0608 4000 PM10 ZON.IT0607 PCA- -NIS -NIS 3800 3600 3400 4000 3000+ 2000 Method 中 RU- FIU- GRA MNF MOV POR- CAT- AS- DI- FIU- RA- MNF- PM10 ZON.IT0608 CAS- fixed thresholds P GRA- MNF- MOR- MOV- Station m -00-00 RON- 3000- 2000- 1000- 3900- 3800- 3700- 3600- 3500- NO2 ZON.IT0609 03 ZON.IT0609 TH 4000- PM10 ZON.IT0609 3000- 2000- 1000- ° uncertainty dependent thresholds#52022-03-03 spatial representativeness area (km²) 90- 80 70- 60 50- 40 model: FARM, period: 2017-2020 NO2 ZON.IT0607 + 3000 2000 1000 NO2 ZON.IT0608 B 4000- NO2 ZON.IT0609 SR area is larger with UDT-method for PM10 and NO₂, smaller for O3; ©2000- O₁: SR area less often coin- cides with the IPR AQ zone 272- 271-> 270 269 268 200- 100- 03 CAI 3 3 € ZON.IT0607 ZON.IT0608 4000 PM10 ZON.IT0607 -NIS Method 3800 3600 3400 4000 3000+ 2000 业 BRU- RU- FIU- GRA CAT- CAS- DI- FIU- RA- MNF- பு சு PM10 ZON.IT0608 fixed thresholds GRA- MNF- MOR- MOV- Station m 3900- 3800- 3700- 3600- 3500- 03 ZON.IT0609 4000- PM10 ZON.IT0609 3000- 2000- 1000- ° uncertainty dependent thresholds G.Bonafè 3/5#6CAR- PCA- ROS- spatial representativeness area (km²) SIN- ZON.IT0607 PCA- ROS- BRU- CAI- CAS- EDI- FIU- SGRA- MNF- MOR- MOV- OSV- POR- RON- Station SGV- Method fixed thresholds uncertainty dependent thresholds PM10 ZON.IT0608 TOL- model: KED, period: 2015-2020 NO2 ZON.IT0607 CAI- CAS- EDI- FIU- GRA- MNF- MOV- POR- UGO- 3000 RON- SGV- PM10 ZON.IT0609 ZON.ITO608 1000- 9 UGO- NO2 ZON.IT0609#72022-03-03 100 spatial representativeness area (km²) 200 PCA- 40 80 100 model: KED, period: 2015-2020 NO2 ZON.IT0607 60 2000 PM10 ZON.IT0607 ROS- NIS Method 廿 3000 1000 CAS- PM10 ZON.IT0608 3000 FIU- GRA- NO2 ZON.IT0608 MOV- POR RON- 3000 2000 2000- 1000 BRU CAS- fixed thresholds GRA- MNF- MOR- MOV- OSV- POR- RON- SGV- Station 1000- uncertainty dependent thresholds 4000- NO2 ZON.IT0609 SR area: KED has larger inte- rannual variability than FARM, but smaller differences bet- 2000 ween the two methods 1000- PM10 ZON.IT0609 UGO- G.Bonafè 4/5#8ARPA FVG references per le Protezionale dell'Ambiente Bonafè, G. (2020). dartle: Air Quality Model Benchmarking. R package version 0.1.2. ☑Janssen, S., Guerreiro, C., Viaene, P., Georgieva, E., and Thunis, P. (2017). Guidance document on modelling quality objectives and benchmarking. 2022-03-03 G.Bonafè 5/5