Infrared Reference Spectra
Introduction
This data repository provides access to simulated infrared radiance spectra for a range of atmospheric conditions and satellite observation geometries. Radiative transfer calculations were performed with the MIPAS Reference Forward Model (RFM). The spectra cover the range from 650 to 2650 cm-1 (3.77 to 15.4 microns), with a spectral sampling and resolution of 0.05 cm-1. Spectroscopic data were taken from the HITRAN2k database (Rothman et al., 2003). Calculations were performed for five standard atmospheres for the tropics, the mid-latitudes at day- and nighttime, polar summer, and polar winter (Remedios et al., 2007). Radiance contributions of 35 trace gases are taken into account. We considered nadir sounding as well as limb geometries with 5,10, 20, and 40 km tangent height.
Further information can be found in these references:
Dudhia A., Reference Forward Model (RFM) Software User's Manual. ESA Document PO-MA-OXF-GS-0003, ESTEC, Noordwijk, 1997, http://eodg.atm.ox.ac.uk/RFM.
Rothman, L. S., Barbe, A., Benner, D. C., Brown, L. R., Camy-Peyret, C., Carleer, M. R. et al. (2003): The HITRAN molecular spectroscopic database: edition of 2000 including updates through 2001. Journal of Quantitative Spectroscopy and Radiative Transfer, 82(1), 5-44.
Remedios, J. J., Leigh, R. J., Waterfall, A. M., Moore, D. P., Sembhi, H., Parkes, I., Greenhough, J., Chipperfield, M. P., and Hauglustaine, D.: MIPAS reference atmospheres and comparisons to V4.61/V4.62 MIPAS level 2 geophysical data sets, Atmos. Chem. Phys. Discuss., 7, 9973-10017, doi:10.5194/acpd-7-9973-2007, 2007.
Browse images
The browse images provided on this web site show brightness temperature spectra (nadir) or radiance spectra (limb) for the complete range considered in the radiative transfer calculations. The gray curve shows the total radiance taking into account the most relevant trace gases in the atmosphere. The red curve shows the spectrum for an atmosphere consisting of only the selected trace gas.
Data access
The reference spectra are provided as ASCII files. In each file the first column provides the wavenumber [cm-1]. The second column provides brightness temperatures [K] for nadir spectra or radiances [W/(m2 sr cm-1)] for limb spectra.Legal notes
The data sets and browse images provided on this site are licensed under a Creative Commons Attribution 4.0 International License. You are free to share the material in any medium or format and adapt it for any purpose, even commercially. You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits. The licensor cannot revoke these freedoms as long as you follow the license terms. The data are distributed in the hope that it will be useful, but without any warranty. Please follow the link to see the terms and conditions of the license:
Contact
Please do not hesitate to contact us if you have any further questions:
Dr. Lars Hoffmann
Forschungszentrum Jülich
Jülich Supercomputing Centre
52425 Jülich
Germany
e-mail: l.hoffmann@fz-juelich.de
