Determination of atmospheric turbidity parameters and aerosol size distribution using a feedback-controlled sun-tracking sunphotometer

Atmospheric turbidity parameters and aerosol size distribution over Manila were obtained using a feedback-controlled sun-tracking sunphotometer from 24 April 2006 26 September 2006. A total of 38 experiment days were conducted. A combination of mathematical and feedback system algorithms was used. T...

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Main Author: Macalalad, Ernest Pagaran
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Language:English
Published: Animo Repository 2006
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Online Access:https://animorepository.dlsu.edu.ph/etd_masteral/3432
https://animorepository.dlsu.edu.ph/context/etd_masteral/article/10270/viewcontent/CDTG004191_P.pdf
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Institution: De La Salle University
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spelling oai:animorepository.dlsu.edu.ph:etd_masteral-102702024-02-20T09:37:22Z Determination of atmospheric turbidity parameters and aerosol size distribution using a feedback-controlled sun-tracking sunphotometer Macalalad, Ernest Pagaran Atmospheric turbidity parameters and aerosol size distribution over Manila were obtained using a feedback-controlled sun-tracking sunphotometer from 24 April 2006 26 September 2006. A total of 38 experiment days were conducted. A combination of mathematical and feedback system algorithms was used. The tracking system was incorporated by a data acquisition system that used a PCI-6023E DAQ card. The Sunphotometer Data Acquisition and Processing System (SunDAPS) was developed using LabVIEW 6.1 to acquire and analyze data, and control the sun-tracker automatically using a desktop computer. Calibration procedure was performed in La Salle College-Antipolo in 30 April 2006 using the Langley method. The procedure yielded high correlation coefficients (R > 0.900). A look-up table (LUT) of wavelength exponents was generated from the extinction coefficient from different aerosol types (urban, continental average, continental clean or rural, maritime polluted and maritime clean), which was used to determine the log-normal size distribution of each data set. Size distribution of aerosol using the Junge model was also determined from the wavelength exponent. The daily variation of aerosol optical depth (AOD) for each wavelength, wavelength exponent (a) and Angstrom turbidity coefficient (b), were derived from the direct beam measurements. The values of AOD range from 0.159 (675 nm) to 0.800 (368 nm) while b and a varied from 0.113 to 0.325 and 0.04 to 1.185, respectively. The average value of b per weekday showed that weekdays (with Monday the greatest) exhibit relatively high values of beta than weekends (Saturday being the least). The monthly variation of b showed that the month of May contained the least amount of aerosols. The prevailing value of AOD is around 0.300 to 0.500 while b was predominantly valued from 0.150 to 0.250, with both distributions having the same shape. On the other hand, a reveal the slight dominance of continental aerosols (58%) over the maritime aerosols (42%). However, during the month of September maritime aerosols (79%) were more dominant than continental aerosols (21%). AOD and b gathered from 24 April 2006 to 8 September 2006 show high positive linear correlation (R = 0.818). When plotted against the AOD at 500 nm and b, as lie on the region of low to moderate AODs and bs. The average PM2.5 mass concentration determined in two locations (DLSU-Manila and LSC-Antipolo) were found to be 8.54 µg/m3 and 15.3 µg/m3. The results in LSC-Antipolo were within the range of values obtained in Good Shepherd Spiritual Center, Antipolo by the Manila Observatory (PM2.5 = 18.2 µg/m3). A positive correlation (R = 0.121) of PM2.5 mass concentration with a and negative correlation (R = -0.821) with b was also determined. Moreover, the b in Antipolo was significantly lesser than in Manila. Also the diurnal variation of AOD (500 nm) showed a low standard deviation (SD = 0.019) while the slope of the best-fit line was almost horizontal (slope = 0.006). 2006-01-01T08:00:00Z text application/pdf https://animorepository.dlsu.edu.ph/etd_masteral/3432 https://animorepository.dlsu.edu.ph/context/etd_masteral/article/10270/viewcontent/CDTG004191_P.pdf Master's Theses English Animo Repository Atmospheric turbidity Atmospheric turbidity--Manila Aerosol Turbidity Physics
institution De La Salle University
building De La Salle University Library
continent Asia
country Philippines
Philippines
content_provider De La Salle University Library
collection DLSU Institutional Repository
language English
topic Atmospheric turbidity
Atmospheric turbidity--Manila
Aerosol
Turbidity
Physics
spellingShingle Atmospheric turbidity
Atmospheric turbidity--Manila
Aerosol
Turbidity
Physics
Macalalad, Ernest Pagaran
Determination of atmospheric turbidity parameters and aerosol size distribution using a feedback-controlled sun-tracking sunphotometer
description Atmospheric turbidity parameters and aerosol size distribution over Manila were obtained using a feedback-controlled sun-tracking sunphotometer from 24 April 2006 26 September 2006. A total of 38 experiment days were conducted. A combination of mathematical and feedback system algorithms was used. The tracking system was incorporated by a data acquisition system that used a PCI-6023E DAQ card. The Sunphotometer Data Acquisition and Processing System (SunDAPS) was developed using LabVIEW 6.1 to acquire and analyze data, and control the sun-tracker automatically using a desktop computer. Calibration procedure was performed in La Salle College-Antipolo in 30 April 2006 using the Langley method. The procedure yielded high correlation coefficients (R > 0.900). A look-up table (LUT) of wavelength exponents was generated from the extinction coefficient from different aerosol types (urban, continental average, continental clean or rural, maritime polluted and maritime clean), which was used to determine the log-normal size distribution of each data set. Size distribution of aerosol using the Junge model was also determined from the wavelength exponent. The daily variation of aerosol optical depth (AOD) for each wavelength, wavelength exponent (a) and Angstrom turbidity coefficient (b), were derived from the direct beam measurements. The values of AOD range from 0.159 (675 nm) to 0.800 (368 nm) while b and a varied from 0.113 to 0.325 and 0.04 to 1.185, respectively. The average value of b per weekday showed that weekdays (with Monday the greatest) exhibit relatively high values of beta than weekends (Saturday being the least). The monthly variation of b showed that the month of May contained the least amount of aerosols. The prevailing value of AOD is around 0.300 to 0.500 while b was predominantly valued from 0.150 to 0.250, with both distributions having the same shape. On the other hand, a reveal the slight dominance of continental aerosols (58%) over the maritime aerosols (42%). However, during the month of September maritime aerosols (79%) were more dominant than continental aerosols (21%). AOD and b gathered from 24 April 2006 to 8 September 2006 show high positive linear correlation (R = 0.818). When plotted against the AOD at 500 nm and b, as lie on the region of low to moderate AODs and bs. The average PM2.5 mass concentration determined in two locations (DLSU-Manila and LSC-Antipolo) were found to be 8.54 µg/m3 and 15.3 µg/m3. The results in LSC-Antipolo were within the range of values obtained in Good Shepherd Spiritual Center, Antipolo by the Manila Observatory (PM2.5 = 18.2 µg/m3). A positive correlation (R = 0.121) of PM2.5 mass concentration with a and negative correlation (R = -0.821) with b was also determined. Moreover, the b in Antipolo was significantly lesser than in Manila. Also the diurnal variation of AOD (500 nm) showed a low standard deviation (SD = 0.019) while the slope of the best-fit line was almost horizontal (slope = 0.006).
format text
author Macalalad, Ernest Pagaran
author_facet Macalalad, Ernest Pagaran
author_sort Macalalad, Ernest Pagaran
title Determination of atmospheric turbidity parameters and aerosol size distribution using a feedback-controlled sun-tracking sunphotometer
title_short Determination of atmospheric turbidity parameters and aerosol size distribution using a feedback-controlled sun-tracking sunphotometer
title_full Determination of atmospheric turbidity parameters and aerosol size distribution using a feedback-controlled sun-tracking sunphotometer
title_fullStr Determination of atmospheric turbidity parameters and aerosol size distribution using a feedback-controlled sun-tracking sunphotometer
title_full_unstemmed Determination of atmospheric turbidity parameters and aerosol size distribution using a feedback-controlled sun-tracking sunphotometer
title_sort determination of atmospheric turbidity parameters and aerosol size distribution using a feedback-controlled sun-tracking sunphotometer
publisher Animo Repository
publishDate 2006
url https://animorepository.dlsu.edu.ph/etd_masteral/3432
https://animorepository.dlsu.edu.ph/context/etd_masteral/article/10270/viewcontent/CDTG004191_P.pdf
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