Nur Hasinah Najiah Maizan (2017) Establishment of perez du-mortier calibration algorithm as a sunphotometers calibration protocol at a altitude above sea level. Masters thesis, Universiti Malaysia Sabah.
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Abstract
Calibration of sunphotometer using Langley technique requires direct sun irradiance data during very clear and stable atmospheric condition. However, it is impenetrable to find cloud free condition at near sea level altitude especially tropical country due to cloud loading and rainfall throughout the year. Recently, near sea level Langley calibration method for ground based measurement was developed by combining Perez Du- Mortier (PDM) algorithm with statistical filter. It is already known that PDM as an improved Langley method are capable in calibrating sunphotometers at nearsea- level. Therefore, this research are focused on the implementation of PDM as establish calibration protocol at different altitudes above sea level. In order to achieved this desired, this improved Langley method should be able to achieve standard target as a establish calibration protocol by producing results that are approaching Standard Langley Method. Thus, in this research, the performance of PDM method was examined at three different altitude site where data were collected at site A for high altitude at 3,270 m a.s.l, Site B for mid altitude (1,574 m a.s.l.), and site C for low altitude (7 .8 m a.s.l) for four nominal wavelengths. Calibration constant retrieved by PDM at different altitude were compared with Standard Langley Method which performed at high altitude. Result shows that the reproducibility of calibration constant using the PDM calibration method at three different altitude when compared with Standard Method is acceptable to a certain extent of not greater than "'3% at most. Therefore, it prove that, PDM is feasible in calibrating sun photometer at different altitude above sea level by producing data that approaching to Standard Langley Method at high altitude.
| Item Type: | Thesis (Masters) |
|---|---|
| Keyword: | Sunphotometer calibration, Langley plot method, Perez Du-Mortier algorithm, Atmospheric radiation, Solar irradiance, Ground-based remote sensing |
| Subjects: | Q Science > QC Physics > QC1-999 Physics > QC851-999 Meteorology. Climatology Including the earth's atmosphere |
| Department: | FACULTY > Faculty of Science and Natural Resources |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 21 Apr 2025 11:42 |
| Last Modified: | 21 Apr 2025 11:42 |
| URI: | https://eprints.ums.edu.my/id/eprint/43508 |
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