1. Evaluation of the upcoming version of the global production system
S. Chabrillat (BIRA-IASB), H.J. Eskes (KNMI) and the CAMS-84 team

2. o-suite versus e-suite
o-suite = operational run delivering global AN, FC of Reactive Gases and Aerosols (GHG not considered here)
Model = C-IFS (Cy41R1) - CB05 (from TM5 model)
e-suite = experimental run  will be o-suite next week
2 FC/day: from AN at 0UTC and 12UTC. FC from 12UTC available at 22UTC: 12h earlier than o-suite
Same model, same vert. grid, same assim. obs.
Horiz. resol. ↗ from T255 (~80km) to T511 (~40km)  model better uses horiz. resol. of emissions (0.5° anth+bio, 0.1°x0.1° fires)

3. Evaluation approach
Compare o-suite and e-suite vs same indep obs. as quarterly reports, w/same methodology & for same species: tropo O3, tropo NO2, CO, CH2O, aerosols, strato O3
Schedule:
End of March: quicklooks to ECMWF - in case major issues are found which could imply aborting the e-suite run.
20 April: deadline for input (to KNMI & BIRA)
21-26 April: telecon to discuss findings, agree on conclusions
26-29 April: report to ECMWF, decision on upgrade
week of 2 May: publish report including possible feedback

4. Exemples of quicklooks used for “early green light”
NO2 vs MAXDOAS at Xianghe (Beijing)
O3 vs surf GAW surf at HPB
CO vs MOPPIT, IASI
O3 vs sondes: N. mid-lat bias
Aer OD550 model comp.

5. Evaluation of tropo O3 : vertical profiles
O3 sondes
IAGOS aircrafts
Port Harcourt is in Equatorial West Africa
biases slightly change but not significant
more differences in lower layers

6. Evaluation of tropo O3 : surface
Use GAW, ESRL, AIRBASE networks At most stations, no significant differences (both underestimate obs over EU region) except for stations located in complex terrain where significantly improved results likely due to the increased model resolution. Largest improvements: Boulder, HPB (close to mountain ranges) and Mediterranean best case: Al Cornocales, Spain
Station (ESRL)

7. o-suite vs e-suite model resolution around Al Cornocales
Current o-suite grid does not resolve Gibraltar strait at latitude of this station; e-suite grid starts doing it
40 km
80 km

8. Evaluation of tropo NO2
vs GOME-2 tropo column avg over std regions  no improvement
vs DOAS at Xianghe (near Beijing, high pollution): significant improvement from surface to 2km
comparison at Xianghe is deemed significant because it takes
vertical smoothing errors into account and is based on 203 individual profiles

9. Evaluation of CH2O, strato O3
Evaluation of tropo CO
no significant/consistent improvement vs IAGOS profiles or MOPITT, IASI satellites or ground-based FTIR (NDACC, TCCON)
Exemple: IAGOS, 3 East Asia airports  varied results
Evaluation of CH2O, strato O3
no significant differences

10. Evaluation of aerosols
e-suite o-suite
vs Aeronet sun photometers: very similar.
e-suite simulates slightly less sea salt and dust AOD than current o-suite.
Maps of Angstrøm coefficient (low values = coarse particles = more dust) confirm less dust in central Asia in the e-suite.
Maybe cause for slight degradation of performance (against AOD) in China?
Elsewhere: no consistent degradation/improvement.
AOD
Angström

11. Conclusions
New version operational next week. Full eval report publised 29 April at
No significant differences should be expected from this global production system upgrade. Exceptions:
Decrease of dust aerosols in central Asia; not in obs  slight degradation of performance
Improvements may be expected close to surface due to horiz resol increase (~80km  ~40km) especially in
regions with complex terrain (O3 ; noted on Boulder, HPB)
Highly polluted regions (NO2 ; noted in Xianghe)
Good training for next model upgrade (expecting more impact!)