Study of aerosol optical properties in Lumbini, Nepal
The mixture of different sized particles (fine and coarse) with air composition forms aerosols. Increased economic activities, vehicles, and rapid urbanization made Lumbini one of the heavily polluted regions in Nepal. Data are extracted from AERONET websites between 2013 to 2019 with standard devia...
| Principais autores: | , , , , , , |
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| Formato: | Artigo |
| Idioma: | English |
| Publicado em: |
Department of Physics, Mahendra Morang Adarsh Multiple Campus, Tribhuvan University
2023-04-01
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| coleção: | Bibechana |
| Assuntos: | |
| Acesso em linha: | https://www.nepjol.info/index.php/BIBECHANA/article/view/48825 |
| _version_ | 1827250557761355776 |
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| author | Santosh Sapkota Sabin Gautam Santosh Pokhrel Aayush Gautam Kailash Basnet Roshan Kumar Mishra Jeevan Regmi |
| author_facet | Santosh Sapkota Sabin Gautam Santosh Pokhrel Aayush Gautam Kailash Basnet Roshan Kumar Mishra Jeevan Regmi |
| author_sort | Santosh Sapkota |
| collection | DOAJ |
| description | The mixture of different sized particles (fine and coarse) with air composition forms aerosols. Increased economic activities, vehicles, and rapid urbanization made Lumbini one of the heavily polluted regions in Nepal. Data are extracted from AERONET websites between 2013 to 2019 with standard deviation. We are mainly focused on understanding variations in aerosol optical properties: aerosol optical depth (AOD), angstrom parameter (α and β), visibility, single-scattering albedo (SSA), refractive index (real and imaginary), and asymmetry parameter (AP) in the Lumbini region. The maximum value of AOD (675nm) in Lumbini occurred mostly during post-monsoon season (0.61 ± 0.38) whereas, the values of AOD were found to be lower during the monsoon season (0.18 ± 0.12). Most of the AOD values are found to be greater than 0.4, indicating the higher level of pollution in the study area. There is a positive correlation between perceptible water and AOD, maximum correlation (0.4) occurs at the lowest AOD (440nm) while the minimum (0.1) at the highest AOD (1020nm). The turbidity coefficient (β) has an adverse effect on visibility. The Visibility over Lumbini was found to be highest (20 km) during monsoon. Single-scattering albedo (SSA) accretions occur at wavelengths between 440 and 675 nm, but the pattern changes from 675 to 1020 nm. All parameters were found to be distinct and seasonal fluctuations among this station are mainly due to the different aerosols availability such as biomass burning, mixed aerosols, and anthropogenic aerosols over the Lumbini site.
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| first_indexed | 2024-04-09T18:19:03Z |
| format | Article |
| id | doaj.art-9ff6a20338d244f1917d8ac7b0882e06 |
| institution | Directory Open Access Journal |
| issn | 2091-0762 2382-5340 |
| language | English |
| last_indexed | 2025-03-22T00:05:26Z |
| publishDate | 2023-04-01 |
| publisher | Department of Physics, Mahendra Morang Adarsh Multiple Campus, Tribhuvan University |
| record_format | Article |
| series | Bibechana |
| spelling | doaj.art-9ff6a20338d244f1917d8ac7b0882e062024-05-16T13:06:01ZengDepartment of Physics, Mahendra Morang Adarsh Multiple Campus, Tribhuvan UniversityBibechana2091-07622382-53402023-04-0120110.3126/bibechana.v20i1.4882575891Study of aerosol optical properties in Lumbini, NepalSantosh Sapkota0Sabin Gautam1Santosh Pokhrel2Aayush Gautam3Kailash Basnet4Roshan Kumar Mishra5Jeevan Regmi6Prithvi Narayan Campus, Tribhuvan UniversityPokhara Astronomical SocietyPrithvi Narayan Campus, Tribhuvan UniversityBirendra Multiple Campus, Tribhuvan UniversityPrithvi Narayan Campus, Tribhuvan UniversityUniversity of Maryland, Baltimore CountyPrithvi Narayan Campus, Pokhara, TUThe mixture of different sized particles (fine and coarse) with air composition forms aerosols. Increased economic activities, vehicles, and rapid urbanization made Lumbini one of the heavily polluted regions in Nepal. Data are extracted from AERONET websites between 2013 to 2019 with standard deviation. We are mainly focused on understanding variations in aerosol optical properties: aerosol optical depth (AOD), angstrom parameter (α and β), visibility, single-scattering albedo (SSA), refractive index (real and imaginary), and asymmetry parameter (AP) in the Lumbini region. The maximum value of AOD (675nm) in Lumbini occurred mostly during post-monsoon season (0.61 ± 0.38) whereas, the values of AOD were found to be lower during the monsoon season (0.18 ± 0.12). Most of the AOD values are found to be greater than 0.4, indicating the higher level of pollution in the study area. There is a positive correlation between perceptible water and AOD, maximum correlation (0.4) occurs at the lowest AOD (440nm) while the minimum (0.1) at the highest AOD (1020nm). The turbidity coefficient (β) has an adverse effect on visibility. The Visibility over Lumbini was found to be highest (20 km) during monsoon. Single-scattering albedo (SSA) accretions occur at wavelengths between 440 and 675 nm, but the pattern changes from 675 to 1020 nm. All parameters were found to be distinct and seasonal fluctuations among this station are mainly due to the different aerosols availability such as biomass burning, mixed aerosols, and anthropogenic aerosols over the Lumbini site. https://www.nepjol.info/index.php/BIBECHANA/article/view/48825Aerosol Optical DepthAngstrom ExponentLumbini |
| spellingShingle | Santosh Sapkota Sabin Gautam Santosh Pokhrel Aayush Gautam Kailash Basnet Roshan Kumar Mishra Jeevan Regmi Study of aerosol optical properties in Lumbini, Nepal Bibechana Aerosol Optical Depth Angstrom Exponent Lumbini |
| title | Study of aerosol optical properties in Lumbini, Nepal |
| title_full | Study of aerosol optical properties in Lumbini, Nepal |
| title_fullStr | Study of aerosol optical properties in Lumbini, Nepal |
| title_full_unstemmed | Study of aerosol optical properties in Lumbini, Nepal |
| title_short | Study of aerosol optical properties in Lumbini, Nepal |
| title_sort | study of aerosol optical properties in lumbini nepal |
| topic | Aerosol Optical Depth Angstrom Exponent Lumbini |
| url | https://www.nepjol.info/index.php/BIBECHANA/article/view/48825 |
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