Satellite-Based Background Aerosol Optical Depth Determination via Global Statistical Analysis of Multiple Lognormal Distribution
Determining background aerosol optical depth threshold value (BAOD) is critical to aerosol type identification and air pollution control. This study presents a statistical method to select the best BAOD threshold value using the VIIRS DB AOD products at 1 × 1 degree resolution from 2012 to 2019 as a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-03-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/16/7/1210 |
| _version_ | 1827286553173426176 |
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| author | Qi-Xiang Chen Chun-Lin Huang Shi-Kui Dong Kai-Feng Lin |
| author_facet | Qi-Xiang Chen Chun-Lin Huang Shi-Kui Dong Kai-Feng Lin |
| author_sort | Qi-Xiang Chen |
| collection | DOAJ |
| description | Determining background aerosol optical depth threshold value (BAOD) is critical to aerosol type identification and air pollution control. This study presents a statistical method to select the best BAOD threshold value using the VIIRS DB AOD products at 1 × 1 degree resolution from 2012 to 2019 as a major testbed. A series of multiple lognormal distributions with 1 to 5 peaks are firstly applied to fit the AOD histogram at each grid point, and the distribution with the highest correlation coefficient (R) gives preliminary estimations of BAOD, which is defined as either the intersection point of the first two normal distribution curves when having multiple peaks, or the midpoint between the peak AOD and the first AOD with non-zero probability when the mono peak is the best fit. Then, the lowest 1st to 100th percentile AOD distributions are compared with the preliminary BAOD distribution on a global scale. The final BAOD is obtained from the best cutoff percentile AOD distributions with the lowest bias compared with preliminary BAOD. Results show that the lowest 30th percentile AOD is the best estimation of BAOD for different AOD datasets and different seasons. Analysis of aerosol chemical information from MERRA-2 further supports this selection. Based on the BAOD, we updated the VIIRS aerosol type classification scheme, and the results show that the updated scheme is able to achieve reliable detection of aerosol type change in low aerosol loading conditions. |
| first_indexed | 2024-04-24T10:35:23Z |
| format | Article |
| id | doaj.art-30feb597810941e5bef18e84123281bd |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-04-24T10:35:23Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
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| series | Remote Sensing |
| spelling | doaj.art-30feb597810941e5bef18e84123281bd2024-04-12T13:25:38ZengMDPI AGRemote Sensing2072-42922024-03-01167121010.3390/rs16071210Satellite-Based Background Aerosol Optical Depth Determination via Global Statistical Analysis of Multiple Lognormal DistributionQi-Xiang Chen0Chun-Lin Huang1Shi-Kui Dong2Kai-Feng Lin3School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, ChinaDetermining background aerosol optical depth threshold value (BAOD) is critical to aerosol type identification and air pollution control. This study presents a statistical method to select the best BAOD threshold value using the VIIRS DB AOD products at 1 × 1 degree resolution from 2012 to 2019 as a major testbed. A series of multiple lognormal distributions with 1 to 5 peaks are firstly applied to fit the AOD histogram at each grid point, and the distribution with the highest correlation coefficient (R) gives preliminary estimations of BAOD, which is defined as either the intersection point of the first two normal distribution curves when having multiple peaks, or the midpoint between the peak AOD and the first AOD with non-zero probability when the mono peak is the best fit. Then, the lowest 1st to 100th percentile AOD distributions are compared with the preliminary BAOD distribution on a global scale. The final BAOD is obtained from the best cutoff percentile AOD distributions with the lowest bias compared with preliminary BAOD. Results show that the lowest 30th percentile AOD is the best estimation of BAOD for different AOD datasets and different seasons. Analysis of aerosol chemical information from MERRA-2 further supports this selection. Based on the BAOD, we updated the VIIRS aerosol type classification scheme, and the results show that the updated scheme is able to achieve reliable detection of aerosol type change in low aerosol loading conditions.https://www.mdpi.com/2072-4292/16/7/1210aerosol typebackground aerosolthreshold valueAODVIIRSMERRA-2 |
| spellingShingle | Qi-Xiang Chen Chun-Lin Huang Shi-Kui Dong Kai-Feng Lin Satellite-Based Background Aerosol Optical Depth Determination via Global Statistical Analysis of Multiple Lognormal Distribution Remote Sensing aerosol type background aerosol threshold value AOD VIIRS MERRA-2 |
| title | Satellite-Based Background Aerosol Optical Depth Determination via Global Statistical Analysis of Multiple Lognormal Distribution |
| title_full | Satellite-Based Background Aerosol Optical Depth Determination via Global Statistical Analysis of Multiple Lognormal Distribution |
| title_fullStr | Satellite-Based Background Aerosol Optical Depth Determination via Global Statistical Analysis of Multiple Lognormal Distribution |
| title_full_unstemmed | Satellite-Based Background Aerosol Optical Depth Determination via Global Statistical Analysis of Multiple Lognormal Distribution |
| title_short | Satellite-Based Background Aerosol Optical Depth Determination via Global Statistical Analysis of Multiple Lognormal Distribution |
| title_sort | satellite based background aerosol optical depth determination via global statistical analysis of multiple lognormal distribution |
| topic | aerosol type background aerosol threshold value AOD VIIRS MERRA-2 |
| url | https://www.mdpi.com/2072-4292/16/7/1210 |
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