Absorption lookup tables in the radiative transfer model ARTS
Artikel i vetenskaplig tidskrift, 2011

We describe the lookup table approach that is used to store pre-calculated absorption data in the radiative transfer model ARTS. The table stores absorption cross sections as a function of frequency, pressure, temperature, and the water vapor volume mixing ratio, where the last dimension is only included for those gas species that require it. The table is used together with an extraction strategy, which uses polynomial interpolation, with recommended interpolation orders between five and seven. We also derived recommended default settings for grid spacings and interpolation orders, and verified that the approach gives very accurate results with these default settings. The tested instrument setups were for AMSU-B, HIRS, and Odin, three well-known satellite remote sensing instruments covering a wide range of frequencies and viewing geometries. Errors introduced by the lookup table were found to be always below a few millikelvin, in terms of the simulated brightness temperature.

Absorption

Radiative transfer models

Lookup table

AMSU

ARTS

HIRS

Odin

Författare

S.A. Buehler

Lulea tekniska Universitet

Patrick Eriksson

Chalmers, Rymd- och geovetenskap, Global miljömätteknik och modellering

O Lemke

Lulea tekniska Universitet

Journal of Quantitative Spectroscopy and Radiative Transfer

0022-4073 (ISSN)

Vol. 112 1559-1567

Drivkrafter

Hållbar utveckling

Ämneskategorier

Meteorologi och atmosfärforskning

Geofysik

Fundament

Grundläggande vetenskaper

DOI

10.1016/j.jqsrt.2011.03.008