Transcript INGOS - Atmospheric Composition Change

InGOS – an integrating activity
preparing for improved
Greenhouse Gases monitoring
over Europe
Ingeborg Levin, Samuel Hammer, Dominik Schmithüsen,
Ute Karstens, Frank Meinhardt, Martina Schmidt,
Peter Bergamaschi, Sanam Vardag
and Alex Vermeulen
Topics discussed today
• Evaluation, correction and error estimates of
„historical“ GHGs data in Europe
• Harmonisation of current and future non-CO2
GHGs observations, including Quality Assurance
and Quality Control
• Travelling instrument comparisons (N2O, CH4,
222Radon etc.)
• 222Radon soil exhalation map for atmospheric
transport model validation
Continuous CH4 observations in Europe
that started before 2000
Voyekovo: 1998
1994
1993
1996
1996
1991
1996
Continuous N2O observations in Europe
that started before 2005
Pallas: 2004
1994
2004
2001
1996
2001
N2O mole fractions over Europe:
average of May 2007 from TM5
N2O mole fractions from TM5-4DVAR (Corazza et al., ACP 2011)
average of 5 lowermost model layers
(between surface and ~1 km height)
N2O mole fractions over Europe:
Synoptic variations from TM5
N2O mole fractions from TM5-4DVAR (Corazza et al., ACP 2011)
average of 5 lowermost model layers
(between surface and ~1 km height)
N2O mole fractions over Europe:
average of May 2007 from TM5
→ WMO/GAW interlaboratory compatibility target
for N2O = ±0.1 ppb
N2O mole fractions from TM5-4DVAR (Corazza et al., ACP 2011)
average of 5 lowermost model layers
(between surface and ~1 km height)
Topics discussed today
• Evaluation, correction and error estimates of
„historical“ GHGs data in Europe
• Harmonisation of non-CO2 GHGs observations,
including Quality Assurance and Control
• Travelling instrument comparisons (N2O, CH4,
222Radon etc.)
• 222Radon soil exhalation map for atmospheric
transport model validation
Continuous N2O observations at
Schauinsland station before and after
correction
before
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
after
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
Error assessment
• Measurement errors:
– repeatability
– reproducibility
∆repeat
∆reprod
– lab-internal scale consistency
– calibration and non-linearity
∆sc_consist
∆cal_non_lin
• Sampling errors:
–
–
–
–
artifacts from pumps
problems with air drying
leaks in the sampling line
…
Error estimates: CH4 in Heidelberg
from working standard
from target gas
from target gas
Error assessment
• Measurement errors:
– repeatability
– reproducibility
∆repeat Statistical error
∆reprod
– lab-internal scale consistency
– calibration and non-linearity
Systematic error
∆sc_consist
∆cal_non_lin
• Each error will be reported separately
Topics discussed today
• Evaluation, correction and error estimates of
„historical“ GHGs data in Europe
• Harmonisation of non-CO2 GHGs observations,
including Quality Assurance and Control
• Travelling instrument comparisons (N2O, CH4,
222Radon etc.)
• 222Radon soil exhalation map for atmospheric
transport model validation
Harmonisation of future continuous
GHG observations
• Introduction of Quality Assurance measures
– Measurement guidelines
– Central Analytical Lab for working standard production
and calibration
– Monitoring of instrument parameters
– …
• Introduction of comprehensive quality control measures
– Target/Surveillance tanks
– Flask – in situ comparisons
– Round-Robin comparison
– Comparison with „Travelling Instrumentation“
Topics discussed today
• Evaluation, correction and error estimates of
„historical“ GHGs data in Europe
• Harmonisation of non-CO2 GHGs observations,
including Quality Assurance and Control
• Travelling instrument comparisons (N2O, CH4,
222Radon etc.)
• 222Radon soil exhalation map for atmospheric
transport model validation
FTIR spectrometer as travelling
comparison instrument (TCI)
at Mace Head for N2O
N2O comparison at Mace Head
(March – April 2013)
Reason for the difference:
Mainly errors in scale transfer to Working Gases
N2O mole fractions over Europe:
average of May 2007 from TM5
N2O mole fractions from TM5-4DVAR (Corazza et al., ACP 2011)
average of 5 lowermost model layers
(between surface and ~1 km height)
Topics discussed today
• Evaluation, correction and error estimates of
„historical“ GHGs data in Europe
• Harmonisation of non-CO2 GHGs observations,
including Quality Assurance and Control
• Travelling instrument comparisons (N2O, CH4,
222Radon etc.)
• 222Radon soil exhalation map for atmospheric
transport model validation
Development of a 222Radon flux map
January
July
Basic input parameters:
- 226Radium content of soils
- Diffusion model based on soil texture and moisture
- Soil moisture based on Climate Land Surface models
Development of a 222Radon flux map:
validation with flux observations
(multi-annual months repeated)
using Noah soil moist.
using ERA-I/L soil moist.
Measurements
Measurements: Binningen: Szegvary et al. (2006)
M5 Nussloch: Jutzi (2001)
Gebesee: Schell (2004)
Pallas: Lallo et al. (2009)
using Noah soil moist.
using ERA-I/L soil moist.
Measurements
Soil moisture reanalysis: GLDAS Noah LSM
ERA-Interim/Land
First comparison of atmospheric
222Radon: Model estimates vs.
observations
Measurements provided by A. Vermeulen, ECN (Cabauw) and M. Schmidt, LSCE (Gif)
TM5 transport model simulations provided by E. Koffi and P. Bergamaschi, JRC
Summary
• A set of corrected atmospheric CH4, N2O and H2
observations will soon be available for European
flux inversions
• A first attempt is made to also determine and report
uncertainty of these observations
• The Travelling Comparison Instrument approach
was shown to be successful, also for N2O (besides
CO2 and CH4)
• A new process-based 222Radon soil flux map was
developed as input for validation of atmospheric
transport models
Thank you,
and the European Commission’s
for supporting these
activities