|Chacaltaya GAW Station (LFA - IIF - UMSA )
Multi-Angle Absorption Photometer (MAAP)
The Thermo Scientific Model 5012 MAAP measures the aerosol light absorption properties at 670 nm. It registers the modification of radiation fields in the forward and back hemisphere (at 3 different angles) of a glass-fibre filter caused by deposited particles. The aerosol light absorption coefficient is related with ambient equivalent black carbon (eBC) concentration by applying a specific attenuation factor. The eBC is primarily derived from carbonaceous particulate emissions from combustion sources, but includes also dust and inorganic salts. At Chacaltaya data is stored with a one-minute resolution.
Contact person: Fernando Velarde