Auxiliary material for Paper 2008GL034300 

Tropical methane emissions: A revised view from SCIAMACHY onboard ENVISAT

C. Frankenberg
Netherlands Institute for Space Research, Utrecht, Netherlands
 
P. Bergamaschi
European Commission - Joint Research Centre, Institute for Environment and Sustainability, Ispra, Italy
 
A. Butz
Netherlands Institute for Space Research, Utrecht, Netherlands
 
S. Houweling
Netherlands Institute for Space Research, Utrecht, Netherlands
Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands

J.F. Meirink
Royal Netherlands Meteorological Institute, De Bilt, Netherlands
 
J. Notholt
Institute of Environmental Physics, Bremen, Germany
 
A.K. Petersen
Institute of Environmental Physics, Bremen, Germany
 
H. Schrijver
Netherlands Institute for Space Research, Utrecht, Netherlands

T. Warneke
Institute of Environmental Physics, Bremen, Germany
 
I. Aben
Netherlands Institute for Space Research, Utrecht, Netherlands


Frankenberg, C., P. Bergamaschi, A. Butz, S. Houweling, J.F. Meirink, J. Notholt, A.K. Petersen, H. Schrijver, T. Warneke, 
and I. Aben (2008), Tropical methane emissions: A revised view from SCIAMACHY onboard ENVISAT, Geophys. Res. Lett., 35, 
L15811, doi:10.1029/2008GL034300.

Introduction
The auxiliary material describes the cause of the spectroscopic interferences of methane retrievals with water vapor 
absorptions in more detail by using synthetic retrievals. Further, modifications applied to the Bx-Reims water 
spectroscopic database in the SCIAMACHY retrieval window are listed.


2008gl034300-fs01.eps
Propagation of systematic error in spectroscopic parameters in retrieved methane abundances. (a) Forward model runs for 
HITRAN and the modified Blx-Reims spectroscopic databases assuming a tropical atmosphere with high water vapor abundances 
(1.39\cdot 10^{23} molec/cm^2) and a gaussian instrumental lineshape with 1.33 nm FWHM. (b) Resulting forward model error
\Delta F, assuming the new spectroscopic dataset to represent the truth. Figures S1a and S1b are drawn with high spectral 
sampling while the following panels use SCIAMACHY sampling (about 2 pixels per FWHM). (c) Entries of the Jacobian 
K = dF/dx for methane, carbon dioxide and water vapor. (d) How the least squares approach accomodates the systematic error 
in the forward model by incorrectly fitting individual trace gas contributions, shown as thin lines in the same color as 
in Figure S1c. \Delta F is shown as black line, K(\hat{x}-x) as red line}

2008gl034300-ts01.txt
Additional modifications of water spectroscopic parameters. Modified values are marked by a preceding *, units given in 
the header.

2008gl034300-txts01.tex, 2008gl034300-txts01.pdf
Text describing: 
1) Cause of the spectroscopic interferences of methane retrievals with water vapor
2) Modifications applied to the Bxl-Reims spectral database