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UCAM halocarbon observations on SF balloons during HIBISCUS (2003/2004) A. D. Robinson (1), J. D. McIntyre (1), B. Gostlow (1), J. Levine (1), N. R. P. Harris (1,2), J. A. Pyle (1,3) (1) Centre for Atmospheric Science, Cambridge University, Cambridge, UK - PowerPoint PPT Presentation
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UCAM halocarbon observations on SF balloonsduring HIBISCUS (2003/2004)
A. D. Robinson (1), J. D. McIntyre (1), B. Gostlow (1), J. Levine (1),N. R. P. Harris (1,2), J. A. Pyle (1,3)
(1) Centre for Atmospheric Science, Cambridge University, Cambridge, UK(2) European Ozone Research Coordinating Unit, Cambridge, UK
(3) NCAS-ACMSU, Cambridge University, Cambridge, UK
http://www.atm.ch.cam.ac.uk/~halocarbon/
data also stored on NILU database
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Content
Tracer measurement availability
Long lived tracer (CFC-11) on SF4 20040224
Long and short lived tracers on SF1 20040216
TTL tracer profiles (SF1, SF2 and SF3)
Conclusions
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Tracer Lifetime Pre-HIBISCUS 2003 HIBISCUS 2004
20030218
10ZL
20030219
SF2003
20040216
SF1
20040213
SF2
20040226
SF3
20040224
SF4
name formula DIRAC-N2O DIRAC-SLS Descartes I Descartes I Descartes II Descartes I DIRAC-SLS
nitrous oxide N2O 120 y 50
CFC-12 CCl2F2 100 y 6
CFC-113 CCl2FCClF2 85 y ? 15 6 6 8 ?
CFC-11 CCl3F 45 y 46 15 6 6 8 39
carbontetrachloride CCl4 35 y 46 ? 6 6 8 ?
H-1211 CBrClF2 20 y 6 6 8 6
methylchloroform CH3CCl3 5 y 46 15 6 6 8 ?
chloroform CHCl3 6 mth 15 6 6 8 ?
dibromomethane CH2Br2 3 mth ? 6 6 8
perchloroethene C2Cl4 3 mth ? ? 6 ?
bromoform CHBr3 2 wks ? ? ? ?
trichloroethene C2HCl3 1 wk ? ? ? ?
Measurements linked to CMDL calibration scale
Measurements not yet linked to recognised calibration scale
Measurements may be available in near future
Tracer measurement availability
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Long lived tracer profiles(DIRAC CFC-11, SF4, 20040224)
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Air temperature, ºC-100 -80 -60 -40 -20 0 20 40
Pot
entia
l te
mpe
ratu
re, K
300
350
400
450
Lapse rate, K km-1-12 -10 -8 -6 -4 -2 0 2 4 6 8 10
[CFC-11] pptv150 200 250 300
[O3] ppb0 200 400 600 800 1000
TTL
Long lived tracer profiles(DIRAC CFC-11, SF4, 20040224)
No significant drop below 430 K, 19 km(vertical transport very slow above this level ?)
Ozone increase begins inside the TTL(local ozone lifetime much shorter than CFC-11 ?)
Slightly higher CFC-11 values around 360 K(horizontal transport from equatorial region ?)
Ozone data courtesy of Graeme Hansford
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Long lived tracer profiles(DIRAC CFC-11, SF4, 20040224)
Ozone data courtesy of Graeme Hansford
CFC-11 O3 relation
[CFC-11] pptv
150 200 250 300
[O3],
ppb
0
200
400
600
800
1000
Strong relation between CFC-11 and ozone
Air temperature, ºC-100 -80 -60 -40 -20 0 20 40
Pot
entia
l te
mpe
ratu
re, K
300
350
400
450
Lapse rate, K km-1-12 -10 -8 -6 -4 -2 0 2 4 6 8 10
[CFC-11] pptv150 200 250 300
[O3] ppb0 200 400 600 800 1000
TTL
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Air temperature, ºC-100 -80 -60 -40 -20 0 20 40
Pot
entia
l te
mpe
ratu
re, K
300
350
400
450
Lapse rate, K km-1-12 -10 -8 -6 -4 -2 0 2 4 6 8 10
[CFC-11] pptv150 200 250 300
[O3] ppb0 200 400 600 800 1000
TTL
Long lived tracer profiles(DIRAC CFC-11, SF4, 20040224)
PV plot courtesy of Alain Hauchecorne
Low vertical gradient in CFC-11 and PV(vertically well mixed layer ?)
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Long and short lived tracers(DESCARTES SF1, 20040216)
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Air temperature, ºC
-100 -80 -60 -40 -20 0 20 40
Po
ten
tial t
em
pe
ratu
re,
K
300
350
400
450
Lapse rate, K km-1
-12 -10 -8 -6 -4 -2 0 2 4 6 8 10
[CFC-113] pptv
0 20 40 60 80 100 120
[CO] nmol nmol-10 20 40 60 80
[O3] ppb
0 200 400 600 800 1000
Long and short lived tracers(DESCARTES SF1, 20040216)
TTL
No significant drop in CFC-113 in TTL region(same situation as CFC-11 on SF4, 20040224)
Ozone increase begins inside the TTL(local ozone lifetime much shorter than CFC-11 ?)
Above background CFC-113 around 340 K, 8 - 9.5 km(also elevated CO, uplifted boundary layer air ? )
Ozone data courtesy of Graeme HansfordCO data from Falcon courtesy of TROCCINOX
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Air temperature, ºC
-100 -80 -60 -40 -20 0 20 40
Pot
entia
l tem
pera
ture
, K
300
350
400
450
Lapse rate, K km-1
-12 -10 -8 -6 -4 -2 0 2 4 6 8 10
[Chloroform] pptv
0 2 4 6 8 10 12
[CO] nmol nmol-10 20 40 60 80
[O3] ppb
0 200 400 600 800 1000
Long and short lived tracers(DESCARTES SF1, 20040216)
TTL
Clear drop in chloroform through TTL region(lifetime of air in TTL < 6 months)
Ozone lifetime similar to chloroform in the TTL?
Above background chloroform in addition toelevated CFC-113
Ozone data courtesy of Graeme HansfordCO data from Falcon courtesy of TROCCINOX
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Air temperature, ºC
-100 -80 -60 -40 -20 0 20 40
Pot
entia
l tem
pera
ture
, K
300
350
400
450
Lapse rate, K km-1
-12 -10 -8 -6 -4 -2 0 2 4 6 8 10
[Dibromomethane] pptv
0.0 0.2 0.4 0.6 0.8
[CO] nmol nmol-10 20 40 60 80
[O3] ppb
0 200 400 600 800 1000
Long and short lived tracers(DESCARTES SF1, 20040216)
TTL
Clear drop in dibromomethane through TTL region(lifetime of air in TTL < 3 months)
Above background dibromomethane?
Ozone data courtesy of Graeme HansfordCO data from Falcon courtesy of TROCCINOX
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TTL tracer profiles(SF1, SF2 & SF3)
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[CFC-113] pptv
0 20 40 60 80
Pot
entia
l tem
pera
ture
, K
340
360
380
400
[O3] ppb
0 200 400 600 800 1000
[O3] ppb
0 200 400 600 800 1000
[Choroform] pptv
0 2 4 6 8 10
[O3] ppb
0 200 400 600 800 1000
Pot
entia
l tem
pera
ture
, K
340
360
380
400
[Dibromomethane] pptv
0.0 0.1 0.2 0.3 0.4
ozone
CFC-113
chloroform
dibromomethane
SF1 20040216
SF2 20040213
SF3 20040226
Ozone data courtesy of Graeme Hansford
Low inter-flight variability for long lived tracers (CFC-113): zero drop off across TTL
More intra-flight / inter-flight variability for short lived tracers: drop off across TTL (except chloroform on SF2)
TTL tracer profiles(SF1, SF2 & SF3)
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Conclusions
The dataset: still aiming to retrieve some short lived data
Long lived tracers: profiles all show little/no change in TTL data relate strongly to ozone
Shorter lived tracers: much more scatter/inter-flight variability (to be expected?) generally show substantial drop off in TTL
Future: very important to make more measurements
Acknowledgements: Many thanks to all the TroCCiBras / TROCCINOX / HIBISCUS community
