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Existing and planned radiotelescopes working in the millimetre (mm) andsub-millimetre wavelengths range provide the possibility to be used foratmospheric line observations. To scrutinize this potential, we outline thedifferences and similarities in technical equipment and observing techniquesbetween ground-based aeronomy mm-wave radiometers and radiotelescopes.Comprehensive tables summarizing the technical characteristics of existing andfuture (sub)-mm radiotelescopes are given. The advantages and disadvantagesusing radiotelescopes for atmospheric line observations are discussed. In viewof the importance of exploring the sub-mm and far-infrared wavelengths rangefor astronomical observations and atmospheric sciences, we present modelcalculations of the atmospheric transmission for selected telescope sites(DOME-C/Antarctica, ALMA/Chajnantor, JCMT and CSO on Mauna Kea/Hawaii,KOSMA/Swiss Alpes) for frequencies between 0 and 2000 GHz (150 micron) andtypical atmospheric conditions using the forward model MOLIERE (version~5). Forthe DOME-C site, the transmission over a larger range of up to 10 THz (30micron) is calculated in order to demonstrate the quality of an earth-boundsite for mid-IR observations. All results are available on a dedicated webpage(http://transmissioncurves.free.fr)

Potential of Radiotelescopes for Atmospheric Line Observations: I. Observation Principles and Transmission Curves for Selected Sites