Langley Calibration of Sun Photometer at Kinabalu Park (1574 M a.s.l.) using PDM Algorithm and statistical filter

Nur Hasinah Najiah Maizan, and Chang Hian Wui, Jackson and Jumat Sulaiman, and Jedol Dayou, (2016) Langley Calibration of Sun Photometer at Kinabalu Park (1574 M a.s.l.) using PDM Algorithm and statistical filter. Transactions on Science and Technology, 3 (3). 455 -461. ISSN 2289-8786

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Abstract

This paper reports the use of improved Langley plot for LED-type sun photometer calibration at four wavelengths 440, 500, 670 and 870 nm. The Langley plot is improved by series filtration using Perez-Dumortier (PDM) algorithm and statistical filter. Data was collected at a mid-altitude site, Kinabalu Park, Kundasang (1,574 m a.s.l.) using a portable ASEQ, LR-1 spectrometer. It is shown that with Langley plot alone, it is impossible to correctly identify or remove atmospheric variations within the calibration measurements. These variations are dominated by cloud cover, and short-cirrus cloud. However, result findings show that PDM algorithm and statistical filter are useful tool to improve the result by filtering data contaminated by cloud loading and remove possible drifts caused by instabilities of the instrument.

Item Type: Article
Uncontrolled Keywords: Langley calibration , Perez-Dumortier (PDM) , Mid- altitude site , Statistical filter
Subjects: Q Science > QA Mathematics
Divisions: FACULTY > Faculty of Science and Natural Resources
Depositing User: Noraini
Date Deposited: 25 Apr 2018 01:58
Last Modified: 25 Apr 2018 01:58
URI: http://eprints.ums.edu.my/id/eprint/19889

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