An Empirical Parameterization to Separate Coarse and Fine Mode Aerosol Optical Depth Over Land
Abstract Retrieving the fine‐mode fraction (FMF) of aerosol optical depth from satellite data is crucial for understanding the impact of natural versus anthropogenic aerosols on climate and air quality. However, few high‐quality global FMF products from MODIS exist. To address this gap, this study d...
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Wiley
2025-03-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL114397 |
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| author | Xiaohan Li Paul Ginoux |
| author_facet | Xiaohan Li Paul Ginoux |
| author_sort | Xiaohan Li |
| collection | DOAJ |
| description | Abstract Retrieving the fine‐mode fraction (FMF) of aerosol optical depth from satellite data is crucial for understanding the impact of natural versus anthropogenic aerosols on climate and air quality. However, few high‐quality global FMF products from MODIS exist. To address this gap, this study derives a new formulation of FMF as a function of the Ångström exponent (AE) based on over 20 years of AERONET measurements. Our results reveal a consistent FMF‐AE relationship across continental regions, supporting the feasibility of globally estimating FMF through a simple empirical function based on AE. Validation with independent NOAA GML data sets shows predicted FMF errors mostly within 0.1. Finally, applying this parameterization to MODIS Aqua and Terra data significantly improved satellite‐derived FMF agreement with AERONET compared to previous derivations. This parameterization provides a simple, valuable tool for accurately deriving FMF over land from MODIS and understanding its impact on climate and air quality. |
| format | Article |
| id | doaj-art-220e7fa5ca0e48c5821fd3f23a3a4908 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-220e7fa5ca0e48c5821fd3f23a3a49082025-08-20T03:10:57ZengWileyGeophysical Research Letters0094-82761944-80072025-03-01526n/an/a10.1029/2024GL114397An Empirical Parameterization to Separate Coarse and Fine Mode Aerosol Optical Depth Over LandXiaohan Li0Paul Ginoux1Atmospheric and Oceanic Sciences Program Princeton University Princeton NJ USANOAA Geophysical Fluid Dynamics Laboratory Princeton NJ USAAbstract Retrieving the fine‐mode fraction (FMF) of aerosol optical depth from satellite data is crucial for understanding the impact of natural versus anthropogenic aerosols on climate and air quality. However, few high‐quality global FMF products from MODIS exist. To address this gap, this study derives a new formulation of FMF as a function of the Ångström exponent (AE) based on over 20 years of AERONET measurements. Our results reveal a consistent FMF‐AE relationship across continental regions, supporting the feasibility of globally estimating FMF through a simple empirical function based on AE. Validation with independent NOAA GML data sets shows predicted FMF errors mostly within 0.1. Finally, applying this parameterization to MODIS Aqua and Terra data significantly improved satellite‐derived FMF agreement with AERONET compared to previous derivations. This parameterization provides a simple, valuable tool for accurately deriving FMF over land from MODIS and understanding its impact on climate and air quality.https://doi.org/10.1029/2024GL114397aerosolMODISFMFAODAERONETclimate |
| spellingShingle | Xiaohan Li Paul Ginoux An Empirical Parameterization to Separate Coarse and Fine Mode Aerosol Optical Depth Over Land Geophysical Research Letters aerosol MODIS FMF AOD AERONET climate |
| title | An Empirical Parameterization to Separate Coarse and Fine Mode Aerosol Optical Depth Over Land |
| title_full | An Empirical Parameterization to Separate Coarse and Fine Mode Aerosol Optical Depth Over Land |
| title_fullStr | An Empirical Parameterization to Separate Coarse and Fine Mode Aerosol Optical Depth Over Land |
| title_full_unstemmed | An Empirical Parameterization to Separate Coarse and Fine Mode Aerosol Optical Depth Over Land |
| title_short | An Empirical Parameterization to Separate Coarse and Fine Mode Aerosol Optical Depth Over Land |
| title_sort | empirical parameterization to separate coarse and fine mode aerosol optical depth over land |
| topic | aerosol MODIS FMF AOD AERONET climate |
| url | https://doi.org/10.1029/2024GL114397 |
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