Multi-angle lidar sensing of traffic aerosol in Manila

• Main Authors: Galvez, Maria Cecilia D., Vallar, Edgar A., Bangsal, Eric B., Macalalad, Ernest P., Roman, Tanglaw A.
• Format: text
• Published: Animo Repository 2004
• Subjects: Aerosols—Remote sensing; Backscattering; Nitrogen oxides > Philippines > Manila; Physics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/3612
• Institution: De La Salle University

Multi-angle lidar sensing of traffic aerosols was conducted in a very busy Manila area. The backscatter coefficients for 355 nm and 532 nm were calculated from Fernald's inversion method using calibration results retrieved from the slant-path method. An aerosol extinction-to-backscatter ratio of 30 sr was assumed in the calculation. Several scans were conducted on 31 July 2003 during peak traffic hours to observe the two-dimensional spatial and temporal distribution of traffic aerosols. The presence of a constant aerosol mass near a busy intersection was observed throughout the scanning period. The calculated backscatter coefficient for these aerosol mass ranged from 3.56×10 -6 m-1sr-1 to 5.01×10-6 m -1sr-1 for 532 nm and 1.76×10-5 m -1sr-1 to 2.02×10-5m-1sr -1 for 355 nm.