Variation of aerosol optical depth in the antarctica peruvian Machu Picchu station

Angeles Suazo, Julio;

Abstract


We describe the results of the study of aerosol optical depth (AOD) aerosols, obtained from the measurement and monitoring campaign carried out during the XVII and XXI Antarctic Peruvian Expedition in the months of January 2007 and February 2013 respectively, in the Antarctic Research Machu Picchu Station (ARMPS) at 62°05'30" S, 58°28'16" W and 6 masl. We used a SP02-L sun photometer, which is within the instrumental framework of the International Polar Year. This instrument has 4 channels: 412 nm, 500 nm, 675 nm and 862 nm, thus allowing direct radiation spectra measurements. The results calculated of AOD in polar latitudes show the lowest average in the world, 0.0551 ± 0.0139 (at 500 nm) during the austral summers of 2007 and 2013; also during these years the AOD (500 nm) ranged from 0.0336 to 0.0743, which is typical in conditions of atmospheric turbidity on a polar site dominated by sea conditions. During this time of year, these AOD reported values are lower than in cities (from 0.25 to 1.7) and much lower than the measurements during biomass burning, when values can reach 0.4. The reported AOD values (500 nm) are within the range of coastal Antarctic stations Neumayer and Aboa which are 0.06 and 0.0551 respectively.

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