Two Approaches of Tropospheric Aerosol Volume Backscattering Coefficient Determination using Mie Scattering LIDAR in Sukhothai

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Siriluk Ruangrungrote
Srinakharinwirot University, Wattana, Bangkok 10110, Thailand
Arunee Intasorn
Srinakharinwirot University, Wattana, Bangkok 10110, Thailand
Amporn Rungjang
Srinakharinwirot University, Wattana, Bangkok 10110, Thailand
Akkaneewut Chabangbon
Chulalongkorn University, Patumwan, Bangkok 10330 Thailand

Abstract

The vertical profiles of tropospheric aerosol volume backscattering coefficients in Sukhothai provinceof Thailand were obtained from two approaches as modified slope method and Fernald method withassumptions of Sa = 35 sr, Sm = 8π/3 sr and also βm(zc) = βm(zc), where zc is at 15 km (aerosol-free layer) andβa(z) is constant for every 6-m heights. Results reveal that with these assumptions, the different values ofvolume backscattering coefficient retrieved by modified slope method are 102 times of one obtained byFernald method in approximate. Hence Fernald method is still validated and more effective since it canevidently indicate aerosol and cloud trends.

Keywords : Mie Lidar / Fernald Method / Modified Slope Method / Critical Height / Lidar Ratio

Article Details

Issue
Vol. 32 No. 1 (2009): January - March
Section
Original Articles
Author Biographies

Siriluk Ruangrungrote, Srinakharinwirot University, Wattana, Bangkok 10110, Thailand

Lecturer, Department of Physics, Faculty of Science.

Arunee Intasorn, Srinakharinwirot University, Wattana, Bangkok 10110, Thailand

Associate Professor, Department of Physics, Faculty of Science.

Amporn Rungjang, Srinakharinwirot University, Wattana, Bangkok 10110, Thailand

Graduate Student, Department of Physics, Faculty of Science.

Akkaneewut Chabangbon, Chulalongkorn University, Patumwan, Bangkok 10330 Thailand

Lecturer, Department of Geology, Faculty of Science.