Boat experiment Aethalometer data analysis Boat experiment Goals To detect secondary aerosol originated from the interaction of urban and forest sources, using a movable detection system, to search the best place to measure the Manaus plume. Boat experiment Logistic: 2 boats (measurement and generator boats) Boat experiment General view Maintenance stop Boat experiment Available systems Gases monitors: NO, NO 2, O 3, H 2 O (v), CO 2 ; CPC, nephelometer, aethalometer, PICAS-P; Filter for organics aerosols and VOCs; AFG filters Meteorological station Boat experiment The crew Boat 1: Scientists : 4 A cooker, the captain, an electricity technician, and a make everything man. Boat 2: Two mariners total: 10 people Boat experiment Sites: Boat experiment Criteria of these choices of sites Numerical meteorological forecasting from IAG, CPTEC (and NOAA?): highest probability to find the Manaus plume Boat experiment Results 1 st travel: site at the entrance of Manacapuru lake; We found the plume. Boat experiment Aethalometer data of site 1(Manacapuru lake) Boat experiment 11-July July Local time Boats moving Contamination event Boat experiment 2nd travel: site at the Anavilhanas islands and other points of Negro river; We found the plume. Boat experiment Aethalometer data of site 2: Boat experiment 16/07/01 17/07/ Local time Boat experiment 18/07/01 19/07/ Local time (hs) Boat experiment 20/07/01 21/07/ Local time Boat experiment 3 rd travel: 26 and 27-July, again at Anavilhanas islands; Too many contaminated data. Despite it, the plume was found. Boat experiment Aethalometer data of 3 rd travel Plume Boat experiment Plume event Plume event? Boat experiment Plume event Plume event? Boat experiment Conclusions: The plume was clearly found; There is a need to wait the Max Planck analysis to elucidate the features of the plume.