O3 Loss


Objectives

   The objectives are:

            To quantify the chemically-induced ozone loss as a fonction of time inside the Arctic vortex each winter.

    Transport model method

            Comparison between measurements and 3-D CTMs in which ozone is considered as a passive tracer


This page contains preliminary results for winter 2015/2016. Contact Dr. Florence GOUTAIL for more details.



Measurements and Models

Large O3 loss in 2015/2016 - Preliminary

 
1. Minimum temperature at 475K (red), 550K (blue), 675K (green)
-
Temperature below PSC formation (194 K) since December
-  Minor warming in mid February

-  Final warming early March

 
2. Ozone above SAOZ station
   Example:  Sodankyla (Finland)
- Top: An increasing difference between SAOZ O3 columns (pink) and
   passive REPROBUS O3 (black) is observed after January 10 .
- Bottom: MIMOSA potential vorticity. High values : polar vortex.

 

3. Cumulative ozone loss above SAOZ using REPROBUS
- Top: ozone loss

  • - loss rate: 0.6%/day Jan 10 - Feb 1
  • - 0.4%/day Feb 1 - Mar 10
  • - Cumulative ozone loss on March 20 : 27% or ~120DU

- Bottom: Denitrification: difference between sunset and sunrise NO2 column

 

4. Cumulative ozone loss above SAOZ stations from Models

REPROBUS : 24%
SLIMCAT   : 25% 





Comparison to previous years - Preliminary

1 - ECMWF Temperatures

    2016 is one of the coldest winter in 18 years

2 - Temperatures and O3 loss since 1994:
Left: minimum ECMWF temperature at 475 K (red) and 550K (blue) north of 30°N and limits for NAT PSC formation.
Middle: Total ozone reduction in the vortex from the SAOZ network (shaded pink).

Right: denitrification until march 10

3 - Summary of yearly O3 loss since 1994

4 - Summary of yearly O3 loss evolution
5 - Comparison with Antarctica
                                                     
For more information or any questions contact: Dr. Florence Goutail: florence.goutail@latmos.ipsl.fr