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Aims: We studied the precipitable water vapour (PWV) content near CerroArmazones and discuss the potential use of our technique of modelling thetelluric absorbtion lines for the investigation of other molecular layers. Thesite is designated for the European Extremely Large Telescope (E-ELT) and thenearby planned site for the Cherenkov Telescope Array (CTA). Methods:Spectroscopic data from the Bochum Echelle Spectroscopic Observer (BESO)instrument were investigated by using line-by-line radiative transfer model(LBLRTM) radiative transfer models for the Earths atmosphere with the telluricabsorption correction tool molecfit. All observations from the archive in theperiod from December 2008 to the end of 2014 were investigated. The datasetcompletely covers the El Nino event registered in the period 2009-2010. Modelsof the 3D Global Data Assimilation System (GDAS) were used for furthercomparison. Moreover, for those days with coincidence of data from a similarstudy with VLT/X-shooter and microwave radiometer LHATPRO data at CerroParanal, a direct comparison is presented. Results: This analysis shows thatthe site has systematically lower PWV values, even after accounting for thedecrease in PWV expected from the higher altitude of the site with respect toCerro Paranal, using the average atmosphere found with radiosondes. We foundthat GDAS data are not a suitable method for predicting of local atmosphericconditions - they usually systematically overestimate the PWV values. Due tothe large sample, we were furthermore able to characterize the site withrespect to symmetry across the sky and variation with the years and within theseasons. This kind of technique of studying the atmospheric conditions is shownto be a promising step into a possible monitoring equipment for CTA.

Study of the atmospheric conditions at Cerro Armazones using astronomical data