Influence of the prescribed solar spectrum on calculations of atmospheric temperature
Article first published online: 29 NOV 2008
Copyright 2008 by the American Geophysical Union.
Geophysical Research Letters
Volume 35, Issue 22, November 2008
How to Cite
2008), Influence of the prescribed solar spectrum on calculations of atmospheric temperature, Geophys. Res. Lett., 35, L22813, doi:10.1029/2008GL035993., , , and (
- Issue published online: 29 NOV 2008
- Article first published online: 29 NOV 2008
- Manuscript Accepted: 24 OCT 2008
- Manuscript Received: 12 SEP 2008
- solar irradiance spectrum;
- solar heating rate;
- stratospheric temperature
 Significant differences in heating rates are found when two solar irradiance spectra are used in a line-by-line radiative transfer code. Compared with a spectrum of recent satellite data an older theoretical spectrum gives 20–40% more heating in the ozone Hartley band, important in the upper stratosphere. The spectra are implemented in a broad-band radiation code to which some improvements are also made to the ozone absorption parameterization. A widely-used spectrum of ground-based data from 1960s gives somewhat lower heating rates. The effects of the changes in the spectrum, and the broad-band scheme, on the temperatures simulated by a middle atmosphere GCM are investigated. The model has previously shown a warm bias, compared with climatology, around the stratopause but this is significantly reduced when the former spectrum is substituted for the latter, and the new ozone parameterization incorporated. The change in spectrum accounts for two-thirds of the improvement.