Impact of global data assimilation system atmospheric models on astroparticle showers

We present a methodology to simulate the impact of the atmospheric models in the background particle flux on ground detectors using the Global Data Assimilation System. The methodology was within the ARTI simulation framework developed by the Latin American Giant Observatory Collaboration. The ground-level secondary flux simulations were performed in a tropical climate in the city of Bucaramanga, Colombia. To validate our methodology, we built monthly profiles over Malargue between 2006 and 2011, comparing the maximum atmospheric depth, X_max, with those calculated with the Auger atmospheric option in CORSIKA. The results show significant differences between the predefined CORSIKA atmospheres and their corresponding Global Data Assimilation System atmospheric profiles. (author)