HYMN FTIR-WG meeting J. Notholt, M. De Mazière, K. Petersen Hydrogen, Methane and Nitrous oxide: Trend variability, budgets and interactions with the biosphere.

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Presentation transcript:

HYMN FTIR-WG meeting J. Notholt, M. De Mazière, K. Petersen Hydrogen, Methane and Nitrous oxide: Trend variability, budgets and interactions with the biosphere

Optimised retrieval strategy Microwindows: same MW as in UFTIR (for both CH 4 and N 2 O) Pressure-temperature-profiles: ECMWF/NCEP/radio-sondes ? Spectroscopy/Linelist: for CH 4 : 1.Hitran Hitran2004 with adjustments (by Frank Hase/Linefit, from HYMN-lab- measurements) 3.Hitran2004 with adjustments (by Christian Frankenberg, including temperature fit, from HYMN-lab-measurements) for N 2 O: Hitran2004 HDF-Format (  Martines Meta data file) Report on optimised retrieval strategy  Ralf Sussmann HYMN FTIR-WG Meeting Pasadena May 2008 Hydrogen, Methane and Nitrous oxide: Trend variability, budgets and interactions with the biosphere

Effect on total columns Hitran FH-lines effect on tot. column: 1.0% lower compared to Hitran2004 scatter less than 0.25% Hitran-CF-Lines effect on tot. column: 0.7% lower compared to Hitran2004 scatter less than 0.25% Hydrogen, Methane and Nitrous oxide: Trend variability, budgets and interactions with the biosphere

Mean differences of vmr relativ to Hitran2004 (in%) FH-HitranCF-Hitran Hydrogen, Methane and Nitrous oxide: Trend variability, budgets and interactions with the biosphere

FH-HitranCF-Hitran Mean differences of vmr relativ to Hitran2004 (in vmr) Hydrogen, Methane and Nitrous oxide: Trend variability, budgets and interactions with the biosphere

- vmr profiles smoother when using HITRAN-CF - mean RMS (Paramaribo 2004): 0.36 Hitran Hitran-FH 0.34 Hitran-CF  Only little improvement - FH-Hitran: total columns 1.0% lower compared to Hitran CF-Hitran: total columns 0.7% lower compared to Hitran2004 Fit and vmr profils -FH Hydrogen, Methane and Nitrous oxide: Trend variability, budgets and interactions with the biosphere

Comparisons CH 4 HITRAN 2004 / Frankenberg and F. Hase lines at St-Denis Corinne Vigouroux Belgian Institute for Space Aeronomy (BIRA-IASB) Brussels, Belgium

Profiles: not really smoother? RMS: small improvement: H: F: Hitran HYMN CF fit and vmr profils: Reunion, St. Denis

(H-F) / [(H+F)/2]: Mean (Bias): % Std: 0.05 % The effect is mainly SYSTEMATIC. Observed variation in CH4 columns remains similar. Effect more pronounced in the stratosphere: Bias: 0-12 km: % = E17 molec/cm km: % = E17 molec/cm -2 Hitran HYMN CF effect on total columns: Reunion, St Denis

Profiles: not really smoother? RMS: small improvement: H: F: Hitran HYMN FH fit and vmr profils: Reunion, St. Denis

(H-F) / [(H+F)/2]: Mean (Bias): % Std: 0.05 % The effect is mainly SYSTEMATIC. Observed variation in CH4 columns remains similar. Effect in molec/cm-2: more pronounced in the troposphere ! Bias: 0-12 km: % = E17 molec/cm km: % = E17 molec/cm -2 Hitran HYMN FH effect on total columns: Reunion, St Denis

Comparisons CH 4 HITRAN 2004 / Hase / Frankenberg lines Pierre Duchatelet Institute of Astrophysics and Geophysics InfraRed Group of Atmospheric and Solar Physics University of Liège, Belgium

Residuals are mean residuals averaged over 227 spectra

MicrowindowHIT-04HaseFrankenberg Mean residuals values averaged over 227 spectra

ECMWF effect on total column: in general 0.075% lower than using NCEP pT-profiles scatter less than 0.05% NCEP vers. ECMWF: Paramaribo

Temperature differences ECMWF – NCEP at Reunion, St-Denis in 2004 (shown in Totnes) Courtesy: C. Senten ! Effect of surface pressure variations and ECMWF orography not yet accounted for. Should not be significant at St Denis at 50 masl

Impact on retrieved total columns: Reunion, St-Denis Bias: % Scatter: 0.06 % The effect is mainly SYSTEMATIC.

Bias: % Scatter: 0.10 % Impact on retrieved partial columns (0-12 km): Reunion, St-Denis

Bias: % Scatter: 0.19 % Impact on retrieved partial columns (12 – 100 km): Reunion, St-Denis

Profiles look better: Other stations ??? NCEP ECMWF Different airmasses but well compensated in the troposphere : similar partial columns are obtained Impact on retrieved profiles: Reunion, St-Denis

NCEP vers. ECMWF Advantage OF ECMWF: - Same meteorology than modeller- and satellite-groups Disadvantage ECMWF: - ECMWF-profiles only up to 65km, the profiles has to be „extended“ - Corinne found an effect on the vmr/total columns of several percent for La Reunion - Apart from an „offset“/bias no significant effect for Paramaribo - NCEP used by TCCON Other comments? Hydrogen, Methane and Nitrous oxide: Trend variability, budgets and interactions with the biosphere

Retrieval error budget: - new HDF files should contain a quite complete error budget (random and systematic) - report to explain it (June 2008) Frank Hase agreed to do the report on retrieval error budget as soon as we fixed the retrieval strategy. Comments? HYMN FTIR-WG Meeting Pasadena May 2008 Associated retrieval error budget Hydrogen, Methane and Nitrous oxide: Trend variability, budgets and interactions with the biosphere

HYMN FTIR-WG Meeting Pasadena May 2008 Deliverable 4.5 / 4.6 For all FTIR-stations: revised historical time series of total column abundances and vertical profiles for CH4 and N2O (all, month 24 /1st September 2008) Preliminary results on the validation of the satellite data with FTIR observations from all sites (BIRA, month 24 /1st September 2008) Hydrogen, Methane and Nitrous oxide: Trend variability, budgets and interactions with the biosphere

SCIA-precision-validation study HYMN FTIR-WG Meeting Pasadena May 2008  Ralf Sussmann Hydrogen, Methane and Nitrous oxide: Trend variability, budgets and interactions with the biosphere