Camille Yver, Martina Schmidt, Michel Ramonet, Mathilde Grand
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
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 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
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
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