[reposted to arts-users instead of arts-dev] Hi,
when ARTS converts a channel (i.e. polychromatic) radiance from one unit to another, such as in yApplyUnit or directly in yCalc, does it take into account the finite width of channels? The NOAA KLM User's Guide provides band corrections (see, for example, Equation 7.3.3-4 and Table D1-4) to compensate for the fact that using the central wavenumber when inverting the Planck function for a radiance integrated over a finite spectral width is not correct. I'm told ATSR simulations use lookup tables. As far as I can tell, ARTS uses only the central frequency (f_backend) but I might be missing something as it's all folded into the sensor_response optimisation so not very easy to follow. What I'm looking for is the physically correct way to do the conversion (with a secondary aim to quantify how large an error is introduced by approximating it monochromatically). I found a forum discussion at http://www.nwpsaf.eu/forum/viewtopic.php?f=8&t=184 where James Hocking links to an old NOAA Technical Report (Weinreb et al, 1981) at http://babel.hathitrust.org/cgi/pt?id=uiug.30112106578377;view=1up;seq=12 . What does ARTS do? regards, Gerrit. _______________________________________________ arts-users mailing list [email protected] https://www.sat.ltu.se/mailman/listinfo/arts-users
