PI	Eleni Liakakou
Operators:	Iasonas Stavroulas, Katerina Bougiatioti
Participant	University of Crete

The Multi Angle Absorption Photometer conducts continuous measurements of elemental carbon (Black Carbon) found in the ambient aerosol. In order to do so, the MAAP utilizes the simple relationships between the light attenuation caused by the filter-deposited aerosol layer and its respective BC loading, taking into account the multiple scattering of radiation by aerosol particles and between the aerosol layer and the filter substrate. The instruments optical sensor is capable of measuring the radiation fields of both the forward and back hemispheres of the aerosol-filter system. Furthermore the data inversion algorithm utilized by the instrument is based on radiation transfer methods and therefore takes multiple scattering processes inside the deposited aerosol and between the aerosol layer and the filter matrix into account. The instrument is capable of measuring BC mass concentration values < 20 ng m-3 on a 24 hour average basis.