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Satellite observations. Christian Frankenberg, SRON, Utrecht Markus Woyde, IUP Heidelberg Ulrich Platt, IUP Heidelberg Cathy Clerbaux. Outline. Status report of SCIAMACHY methane retrievals Status report of IASI methane retrievals. SCIAMACHY retrievals .

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satellite observations

Satellite observations

Christian Frankenberg, SRON, Utrecht

Markus Woyde, IUP Heidelberg

Ulrich Platt, IUP Heidelberg

Cathy Clerbaux

outline
Outline
  • Status report of SCIAMACHY methane retrievals
  • Status report of IASI methane retrievals

First HYMN annual meeting, Totnes, 21-23 Oct. 2007

sciamachy retrievals

SCIAMACHY retrievals

Important milestone in collaboration with Thorsten Warneke, IUP Bremen:

Update of spectroscopic parameteres in the NIR spectral range

the unknowns
The unknowns
  • Pressure broadening coefficients
  • Pressure line shift
  • Line intensities

The solution

  • Use lab measurements done by Thorsten Warneke, IUP Bremen(FTS, OPD:90cm, 280cm cell with methane and N2 as foreign gas)
  • Measurements done at 900,500,250,125,20,5,1 hPa (@25 and -30Degree)
  • Use multispectrum fit to retrieve spectral parameters (ie, global fit using all lab spectra in one constrained least squares fit)

First HYMN annual meeting, Totnes, 21-23 Oct. 2007

conclusions 1
Conclusions 1
  • Broadening seems to be lower than in HITRAN, especially at high J’s in the Q-branch.
  • Seasonal bias seems to be resolved, currently under investigation

First HYMN annual meeting, Totnes, 21-23 Oct. 2007

sciamachy retrievals1

SCIAMACHY retrievals

Latest results after implementation of new spectroscopy and substantial changes to previous versions.

scia 2 year tropospheric average
SCIA 2 year tropospheric average

First HYMN annual meeting, Totnes, 21-23 Oct. 2007

scia 2 year tropospheric average1
SCIA 2 year tropospheric average

First HYMN annual meeting, Totnes, 21-23 Oct. 2007

scia 2 year tropospheric average2
SCIA 2 year tropospheric average

First HYMN annual meeting, Totnes, 21-23 Oct. 2007

time period of the science paper total column xvmr
Time period of the Science paper, total column xVMR

First HYMN annual meeting, Totnes, 21-23 Oct. 2007

summary sciamachy
Summary, SCIAMACHY
  • Methane retrievals substantially improved
  • Tropical regions lower than before (not „too“ low)
  • Averaging kernels for every ground pixel available
  • Data format is HDF5, conversion tools could be provided
  • Once SCIA/6.03 version from ESA is available, reprocessing starts and will yield higher coverage for 2003-2004
  • SCIA spectra quality degrades at the end of 2005, retrieval noise up by a factor of 2, will be analyzed in more detail
  • 2 papers to be written asap...

First HYMN annual meeting, Totnes, 21-23 Oct. 2007

img ftir comparisons
IMG – FTIR Comparisons

Interferometric Monitor for Greenhouses gases, data from 1-10 April 1997

The few collocated measurements are compared with ground based stations profiles smoothed by the IMG averaging kernels.

First HYMN annual meeting, Totnes, 21-23 Oct. 2007

slide20

IASI Lauch and status

Timeline

  • Oct. 19, 2006 MetOp-A launch

 Nov. 29, 2006 First spectra

  • May 24, 2007 L1C Operational dissemination (Eumetcast)
  •  October, 2007 L2 trial and operational dissimination (T, H20)

Level 1

1 106/day = 15 Gb

Infrared Atmospheric Sounding Interferometer

First HYMN annual meeting, Totnes, 21-23 Oct. 2007

iasi spectral range
IASI - Spectral range
  • Extends from 645 to 2760 cm-1
  • Resolution : 0.5 cm-1
  • 2 regions where CH4 absorbs :

around 1300 cm-1

near 2700 cm-1

Infrared Atmospheric Sounding Interferometer

First HYMN annual meeting, Totnes, 21-23 Oct. 2007

iasi influence of solar radiation
IASI – Influence of solar radiation
  • Day and night spectra differs at shortwave wavelengths (>2500 cm-1) due to solar radiation and scattering.
  • The additional inversion results, for some cases, in an improved sensitivity in the boundary layer.
  • And permits to reach 2 levels of vertical information (dofs).

First HYMN annual meeting, Totnes, 21-23 Oct. 2007