1. Ozone loss in the Arctic in winter 2015/2016
F. Goutail, J. P. Pommereau, , A. Pazmiño, F. Lefèvre, LATMOS - CNRS, France,
M. Chipperfield, W. Feng, U. Leeds, UK,
M. Van Roozendael, BIRA-IASB, Belgium ,
P. Eriksen, DMI, Denmark,
K. Stebel, NILU, Norway,
R. Kivi, FMI, Finland,
K. Bognar, X. Zhao, K. Walker, K. Strong , U Toronto, Canada.
NDACC-France 18/11/2016

2. Outline: Ozone loss winter 2015/16 Comparison to Models
Comparison to previous winters
Trends?
NDACC-France 18/11/2016

3. Quantification of chemical ozone loss inside polar vortex
Zhigansk
(CAO)
Salekhard
Sodankyla
(CNRS/FMI)
Harestua
(BIRA)
NyAlesund
(NILU)
Thule
(DMI)
ScoresbySund
(CNRS/DMI)
Eureka
(CNRS/UoT)
OBJECTIVES
Quantification of chemical ozone loss inside polar vortex
METHOD
Comparison between measurements
and modeled passive ozone
-> MEASUREMENTS
SAOZ Arctic Network
-> MODELS- 3D CTM
REPROBUS and SLIMCAT
Two runs: 1- Ozone with full chemistry and 2- Passive Ozone
NDACC-France 18/11/2016

4. O3 NO2 PV Example: Sodankyla, Finland O3 NO2 PV at 475 K from Mimosa
Model passive O3 (Black: )
SAOZ ( Pink)
NO2
at sunrise (blue)
at sunset (pink)
PV at 475 K
from Mimosa O3
NO2 PV IN
OUT
1 Dec 15
10 Apr 16
NDACC-France 18/11/2016

5. O3 NO2 PV Example: Sodankyla, Finland Ozone Loss:
Difference between
Reprobus passive O3 and
SAOZ
NO2 diurnal variation indicating chlorine de-activation
Inside vortex selection
NO2 PV IN
OUT
1 Dec
10 Apr
NDACC-France 18/11/2016

6. Evolution of ozone loss above SAOZ stations inside vortex
Top
Evolution of ozone loss above SAOZ stations inside vortex
Bottom
Difference between sunset and sunrise NO2 columns inside vortex
NDACC-France 18/11/2016

7. Ozone loss 27 ± 3% NO2 Diurnal Variation
Ozone depletion rate % / day between January 10 and March 10
Ozone loss stopped on March 10
Total cumulated loss of 27 ± 3%
NO2 diurnal increase after March 10 (indicating chlorine de-activation)
NDACC-France 18/11/2016

8. Comparison with REPROBUS : above same SAOZ Stations
27 ± 3%
MODEL
REPROBUS:
24 ± 3%
Comparison with REPROBUS : above same SAOZ Stations
Similar results: rate, timing, cumulated loss
NDAC-France 18/11/201

9. Comparison with SLIMCAT : above same SAOZ Stations
27 ± 3%
MODEL
SLIMCAT:
25 ± 3%
Comparison with SLIMCAT : above same SAOZ Stations
Similar results: rate, timing, cumulated loss
NDACC-France 18/11/2016

10. Comparison to previous winters
NDACC-France 18/11/2016

11. SAOZ OZONE LOSS : Large inter-annual variability
dependent on meteorology, vortex stability, vortex duration
2016: 27% loss, third one in the series
38% in % in 1996
NDACC-France 18/11/2016

12. Record low temperature in 2016
T min 475K North of 60°N
2011
2016
One month with T < T ice in January > PSC ice
NDACC-France 18/11/2016

13. Ozone loss vs illuminated PSC volume correlation
2016 : PSC overestimated ( Volume calculation using TNAT)
Not adapted for 2016 because of stratosphere dehydrated and denitrified
NDACC-France 18/11/2016

14. TNAT -1.5° because of changes in H2O and HNO3 concentration
Ozone loss vs illuminated PSC volume correlation
TNAT -1.5° because of changes in H2O and HNO3 concentration
-> PSC volume reduced by ~20%
NDACC-France 18/11/2016

15. Is-there a trend on last 20 years?
Ozone loss
Is-there a trend on last 20 years?
SAOZ Ozone loss
NDACC-France 18/11/2016

16. Is-there a trend on last 20 years?
Temperature at 475 K (18.5 km)
Is-there a trend on last 20 years?
Tmin 475K
NDACC-France 18/11/2016

17. Is-there a trend on last 20 years?
Temperature at 425 K (16.5 km)
Is-there a trend on last 20 years?
Tmin 425K
NDACC-France 18/11/2016

18. Impact of climate change ????
Ozone loss
Tmin 475K
Tmin 425K
NDACC-France 18/11/2016

19. 2016: 27±3% ozone loss (3rd largest)
CONCLUSIONS
2016: 27±3% ozone loss (3rd largest)
Large ozone loss interannual variability, dependent on meteorology and planetary wave activity
Ozone loss increase on last 20 years
-> related to climate change?
NDACC-France 18/11/2016

20. The end
NDACC-France 18/11/2016

21. SAOZ OZONE LOSS EVOLUTION DURING WINTER:
SAOZ OZONE LOSS EVOLUTION DURING WINTER: Large inter-annual variability
0.5%/day in (red) close to 1996 and 2010
0.7%/day in > Largest ozone loss rate (grey)
NDACC-France 18/11/2016

22. - SAOZ OZONE LOSS (blue): Large inter-annual variability
5% in warm winters (1999, 2002, 2004)
20-25% on average
- Comparison with REPROBUS (red) and SLIMCAT (black)
differences to be analyzed
NDACC-France 18/11/2016