Origin of atmospheric aerosols at the Pierre Auger Observatory using backward trajectory of air masses

TL;DR

This study investigates the origins of atmospheric aerosols at the Pierre Auger Observatory by analyzing air mass trajectories and comparing modeled trajectories with actual aerosol measurements to improve atmospheric monitoring for cosmic ray detection.

Contribution

It applies atmospheric backward trajectory modeling to identify aerosol sources at the Pierre Auger Observatory, validated with radiosonde data and aerosol measurements.

Findings

Backward trajectories correlate with aerosol concentration data.

Model validation confirms trajectory accuracy.

Aerosol origins are linked to specific air mass pathways.

Abstract

The Pierre Auger Observatory is the largest operating cosmic ray observatory ever built. Calorimetric measurements of extensive air showers induced by cosmic rays are performed with a fluorescence detector. Thus, one of the main challenges is the monitoring of the atmosphere, both in terms of atmospheric state variables and optical properties. To better understand the atmospheric conditions, a study of air mass trajectories above the site is presented. Such a study has been done using an air-modelling program well known in atmospheric sciences. Its validity has been checked using meteorological radiosonde soundings performed at the Pierre Auger Observatory. Finally, aerosol concentration values measured by the Central Laser Facility are compared to backward trajectories.