Camille Yver, Martina Schmidt, Michel Ramonet, Mathilde Grand
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Atmospheric molecular Hydrogen measurements in the RAMCES network Camille Yver, Martina Schmidt, Michel Ramonet, Philippe Bousquet LSCE/IPSL [email protected]
Transcript of Camille Yver, Martina Schmidt, Michel Ramonet, Mathilde Grand
Atmospheric molecular Hydrogenmeasurements in the RAMCES
network
Camille Yver, Martina Schmidt, Michel Ramonet, Philippe Bousquet
LSCE/[email protected]
Outline• Hydrogen budget• Measurement system
– Description– Quality control– Comparison exercices
• Data – Flask– In-situ
• Local scale: Gif-sur-Yvette• Regional scale: Trainou tower
• Conclusion and work in progress
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Soil sinkFossil fuel Biomass burning
Ocean, vegetation
OH radicalCH4, VOC
Hydrogen Budget
FlaconsAmbient air
PP1 H2/CO chromatograph
CO2, CH4, N2O, SF6chromatograph
CalibrationGases
Carrier gases
Measurement system
Flasks
Description
Central Laboratory Gif-sur-Yvette
etalon
sampleetalonsample A
ACC *=
Ccorr=aCraw+bCraw2 +cCraw
3+d
Measurement system Quality control
Calibration and non-linearity tests every one to two months
Non-linearity
684.8 +/-1.0 ppb
Calibration
Measurement system Quality control
Measurement system Comparaison
Round Robin: Comparison with MPI-BGC withinEUROHYDROS project (MPI-BGC data courtesy of A. Jordan)
Measurement system Comparaison
CarboEurope/IMECC Flask comparaison withMPI-BGC: meandifference around 6 ppb
Alert: Comparison with MPI-BGC
(MPI-BGC data courtesy ofA. Jordan)
Flasks data
H2 data from 15 ground sampling and 2 airborne sampling sites:
- 6 french sites
- 13 northern hemisphere sites
- 1 tropical site
- 3 southern hemisphere sites
Flasks data
Flasks data
Paris
LSCE
In-situ data
Gif-sur-Yvette
7m agl
Paris
Orleans 20 km
95 k
m
Trainou:
Three heights: 50m,100m,
180m agl
Local scale
Local to regionalscale
In-situ data
Gif-sur-Yvette Trainou
In-situ data Gif-sur-Yvette
H2/CO traffic ratio
H2/CO=0.48
* Monday to Friday
* Week-end
See Yver et al. JGR 2009
In-situ data Gif-sur-YvetteΔCRn
ΔCH2
Hydrogen soil uptake
α*22
Rn
HRnH CCjjΔΔ
= 0.24 mm/s
See Yver et al. JGR 2009
Radon Tracer Method:
Radon-222 analyser installed in 05/09
PP1 H2/CO installed in October 2008
In-situ data Trainou
Hydrogensoil uptake
-Two H2/CO GC (PP1) optimized and characterized to analyze atmospheric H2 in the RAMCES network
- H2 mixing ratios from 17 Flask sites in order to extract information of the H2 budget on a global scale
-H2 mixing ratio from 2 in-situ sites to estimate the local and regional H2 sources and sinks (traffic, soil sink)
Conclusion
Merci de votre
attentionPYVAR: 4Dvar inversion with H2 from RAMCES andEUROHYDROS networks (2007-2008)
Work in progress
Merci de votre
attentionInversions :
- standard (sources and sinks optimized together)
- separated soil uptake optimization
- separated sources optimization using H2 isotopes
Work in progress
A-posteriorisources and sinksemission maps
Thank you
