Post campaign Meeting - Eureka 2005,- 30 May 2005
Page 1
SAOZ EUREKA Feb-Mar 05
Outline• Objectives• Results
Florence Goutail Service d’Aeronomie / CNRS, France
SAOZ at Eureka
Post campaign Meeting - Eureka 2005,- 30 May 2005
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SAOZ EUREKA Feb-Mar 05
OBJECTIVES
• Ozone and NO2 monitoring O3, NO2 Slant columns
- One reference spectrum for the whole campaign
Converted Vertical columns - Using an Arctic winter AMF
(from SAOZ balloon profile at 67 °N)- SZA selection: 86 - 91 °
• Ozone loss during winter 2004/05
• Using REPROBUS and/or SLIMCAT 3D CTM
Post campaign Meeting - Eureka 2005,- 30 May 2005
Page 3
SAOZ EUREKA Feb-Mar 05
Instrument
Ground-based SAOZUV-Visible spectrometer looking at zenith(270 -620 nm, 1nm resolution) Columns: O3, NO2, ( Color index - clouds)
Post campaign Meeting - Eureka 2005,- 30 May 2005
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SAOZ EUREKA Feb-Mar 05
30
25
20
15
10
5
90807060504030
AMF O3
NO2
25
20
15
10
919089888786
AMF O3
NO2
O3 and NO2 AMF
Post campaign Meeting - Eureka 2005,- 30 May 2005
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SAOZ EUREKA Feb-Mar 05
O3 and NO2 vertical columns
Ozone:-Large day to day variations-Between day 55 and day 72 difference between morning and evening why?
NO2:After day 69, more sunlight, NO2 is increasing and diurnal variation is observed
550
500
450
400
350
300
Tot
al C
olum
n (
DU
)
9080706050
O3
6
4
2
0Co
lum
n (
101
5 mo
l/cm
2)
9080706050
Day of Year
NO2Morning
Evening
Post campaign Meeting - Eureka 2005,- 30 May 2005
Page 6
SAOZ EUREKA Feb-Mar 05
Why O3 sunset larger than O3 sunrise ?
One explanation could bebecause Eureka is located
atthe edge of the vortex.
Here is a map of PV at 475K
(by Mimosa contour advection
model) yellow inside vortex and
red outside.
Eureka is represented byblue star
PV at 475K10/3/ 2005
Mimosa: A. Hauchecorne, CNRS/SA
Post campaign Meeting - Eureka 2005,- 30 May 2005
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SAOZ EUREKA Feb-Mar 05
Why O3 sunset larger than O3 sunrise ?
As an example:On day 69, March 10,
2005O3sr = 364 DUO3ss = 439 DU
Sunrise: SAOZ is looking toward east that is inside vortex
Sunset: SAOZ is looking toward west that is outside vortex
PV at 475K10/3/ 2005
Post campaign Meeting - Eureka 2005,- 30 May 2005
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SAOZ EUREKA Feb-Mar 05
Ozone loss during Arctic winter
Method:Difference between measurements and passive ozone from a 3D CTM in which ozone is considered as a passive tracer
Model 3D CTM (chemical transport model):Reprobus (F. Lefevre)Slimcat (M. Chipperfield, W Feng)
Post campaign Meeting - Eureka 2005,- 30 May 2005
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SAOZ EUREKA Feb-Mar 05
Ozone loss above Eureka- Slimcat 3D CTMcorrectly
reproducesday to day
variations
-A large differenceis observed
betweentransported
passiveOzone (black) andSAOZ (pink): it isattributed to
chemicalloss.
At the end of winter
the difference reach
135 DU= ~25%
600
500
400
300
Ozo
ne (D
U)
1209060300-30
Day of Year 2005
SLIMCAT full chemistry SLIMCAT passive ozone SAOZ
O3 loss135 DU
EUREKA
Post campaign Meeting - Eureka 2005,- 30 May 2005
Page 10
SAOZ EUREKA Feb-Mar 05
Zhigansk(CNRS/CAO)
Salekhard(CNRS/CAO)
Sodankyla(CNRS/FMI)
Harestua(BIRA)
NyAlesund(NILU)
Thule(DMI)
ScoresbySund(CNRS/DMI)
Zhigansk(CNRS/CAO)
Salekhard(CNRS/CAO)
Sodankyla(CNRS/FMI)
Harestua(BIRA)
NyAlesund(NILU)
Thule(DMI)
ScoresbySund(CNRS/DMI)
Zhigansk(CNRS/CAO)
Salekhard(CNRS/CAO)
Sodankyla(CNRS/FMI)
Harestua(BIRA)
NyAlesund(NILU)
Thule(DMI)
ScoresbySund(CNRS/DMI)
Comparison to other SAOZ Arctic stations
Eureka(Canada)
Measurements and associated model data are selected only when the station is located inside vortex.
Post campaign Meeting - Eureka 2005,- 30 May 2005
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SAOZ EUREKA Feb-Mar 05
Comparison to other SAOZ stations
-Loss above Eureka (green) seems similar to that of other Stations
-Cumulative loss at the end of winter: 25% according to Slimcat
-with REPROBUS 3D CTM 22%
-40
-30
-20
-10
0
10
Ozo
ne
loss
(%
)
-25 + 2%
JAN FEB
Zhigansk Sodankyla Salekhard ScoresbySund Thule NyAlesund Harestua Eureka
DEC MAR APR
SAOZ/SLIMCAT
Post campaign Meeting - Eureka 2005,- 30 May 2005
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SAOZ EUREKA Feb-Mar 05
Conclusion
Ozone and NO2 morning and evening vertical columns recorded for the whole campaign.
Ozone loss during winter 2004/05above SAOZ stations 25%at Eureka: 25% -> 135 DU