You seem to be attempting to access an item that has been removed from the repository.
There is a later version of the item you are trying to access:
Frömming, Christine and Ponater, Michael and Dahlmann, Katrin and Grewe, Volker and Lee, David, S. and Sausen, Robert (2012) Aviation-induced radiative forcing and surface temperature change in dependency of the emission altitude. Journal of Geophysical Research: Atmospheres, 117 (D19104), pp. 1-15. American Geophysical Union. DOI: 10.1029/2012JD018204. ISSN 0148-0227.