Characterization of urban atmosphere of Manila with lidar, filter sampling, and radiosonde

Susana V. Dorado; John L. Holdsworth; Nofel C. Lagrosas; Jose R. T. Villarin; Gemma Narisma; Jun Ellis; Rosa Perez

doi:10.1117/12.417097

13 February 2001 Characterization of urban atmosphere of Manila with lidar, filter sampling, and radiosonde

Susana V. Dorado, John L. Holdsworth, Nofel C. Lagrosas, Jose R. T. Villarin, Gemma Narisma, Jun Ellis, Rosa Perez

Proceedings Volume 4153, Lidar Remote Sensing for Industry and Environment Monitoring; (2001) https://doi.org/10.1117/12.417097
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

Abstract

The first polarization lidar was developed in Manila in early 1997 and it has been operating regularly to the present time. The regular observations aim to monitor and characterize the urban air ofManila and to study tropical clouds as well. The fixed, vertically pointing lidar transmits l5OmJ, 532 nm polarized pulses at 20Hz. The backscatter that is collected by the 27.9 cm, 0.358 nirad telescope is transmitted through a narrow bandpass filter and polarizing beamsplitter, to a two-channel receiver with PMTs operated in analog mode. Lidar signals are averaged for 2 minutes by an 8-bit digitizing storage oscilloscope and transferred to a PC. In this paper, combined measurements on suspended aerosols and boundary layer with lidar and filter-sampling of particles will be presented. These measurements, together with the meteorological data from radiosonde soundings of the weather bureau, on particular cold and hot months will be analyzed and compared. Measurements on an episodic event such as New Year's celebrations will also be discussed. The discussions in this paper will focus on the following: a) characterization of suspended aerosols and boundary layer by lidar depolarization ratio and extinction coefficient measurements and by filter-sampling method, and b) seasonal and diurnal changes ofthe above items.

Citation Download Citation

Susana V. Dorado, John L. Holdsworth, Nofel C. Lagrosas, Jose R. T. Villarin, Gemma Narisma, Jun Ellis, and Rosa Perez "Characterization of urban atmosphere of Manila with lidar, filter sampling, and radiosonde", Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); https://doi.org/10.1117/12.417097

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