Retrieval of Aerosol Optical Depth and FMF over East Asia from Directional Intensity and Polarization Measurements of PARASOL
The advantages of performing aerosol retrieval with multi-angle, multi-spectral photopolarimetric measurements over intensity-only measurements come from this technique’s sensitivity to aerosols’ microphysical properties, such as their particle size, shape, and complex refraction index. In this stud...
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ftdoajarticles:oai:doaj.org/article:7f35a902ab8344f589807ed60556eaf2 2024-02-27T08:32:32+00:00 Retrieval of Aerosol Optical Depth and FMF over East Asia from Directional Intensity and Polarization Measurements of PARASOL Shupeng Wang Li Fang Weishu Gong Weihe Wang Shihao Tang 2023-12-01T00:00:00Z https://doi.org/10.3390/atmos15010006 https://doaj.org/article/7f35a902ab8344f589807ed60556eaf2 EN eng MDPI AG https://www.mdpi.com/2073-4433/15/1/6 https://doaj.org/toc/2073-4433 doi:10.3390/atmos15010006 2073-4433 https://doaj.org/article/7f35a902ab8344f589807ed60556eaf2 Atmosphere, Vol 15, Iss 1, p 6 (2023) polarization AOD FMF aerosol retrieval POLDER Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.3390/atmos15010006 2024-01-28T01:46:32Z The advantages of performing aerosol retrieval with multi-angle, multi-spectral photopolarimetric measurements over intensity-only measurements come from this technique’s sensitivity to aerosols’ microphysical properties, such as their particle size, shape, and complex refraction index. In this study, an extended LUT (Look Up Table) algorithm inherited from a previous work based on the assumption of surface reflectance spectral shape invariance is proposed and applied to PARASOL (Polarization and Anisotropy of Reflectances for Atmospheric Science coupled with Observations from a Lidar) measurements to retrieve aerosols’ optical properties including aerosol optical depth (AOD) and aerosol fine-mode fraction (FMF). Case studies conducted over East China for different aerosol scenes are investigated. A comparison between the retrieved AOD regional distribution and the corresponding MODIS (Moderate-resolution Imaging Spectroradiometer) C6 AOD products shows similar spatial distributions in the Jing-Jin-Ji (Beijing–Tianjin–Hebei, China’s mega city cluster) region. The PARASOL AOD retrievals were compared against the AOD measurements of seven AERONET (Aerosol Robotic Network) stations in China to evaluate the performance of the retrieval algorithm. In the fine-particle-dominated regions, lower RMSEs were found at Beijing and Hefei urban stations (0.16 and 0.18, respectively) compared to those at other fine-particle-dominated AERONET stations, which can be attributed to the assumption of surface reflectance spectral shape invariance that has significant advantages in separating the contribution of surface and aerosol scattering in urban areas. For the FMF validation, an RMSE of 0.23, a correlation of 0.57, and a bias of −0.01 were found. These results show that the algorithm performs reasonably in distinguishing the contribution of fine and coarse particles. Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Atmosphere 15 1 6 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
polarization AOD FMF aerosol retrieval POLDER Meteorology. Climatology QC851-999 |
spellingShingle |
polarization AOD FMF aerosol retrieval POLDER Meteorology. Climatology QC851-999 Shupeng Wang Li Fang Weishu Gong Weihe Wang Shihao Tang Retrieval of Aerosol Optical Depth and FMF over East Asia from Directional Intensity and Polarization Measurements of PARASOL |
topic_facet |
polarization AOD FMF aerosol retrieval POLDER Meteorology. Climatology QC851-999 |
description |
The advantages of performing aerosol retrieval with multi-angle, multi-spectral photopolarimetric measurements over intensity-only measurements come from this technique’s sensitivity to aerosols’ microphysical properties, such as their particle size, shape, and complex refraction index. In this study, an extended LUT (Look Up Table) algorithm inherited from a previous work based on the assumption of surface reflectance spectral shape invariance is proposed and applied to PARASOL (Polarization and Anisotropy of Reflectances for Atmospheric Science coupled with Observations from a Lidar) measurements to retrieve aerosols’ optical properties including aerosol optical depth (AOD) and aerosol fine-mode fraction (FMF). Case studies conducted over East China for different aerosol scenes are investigated. A comparison between the retrieved AOD regional distribution and the corresponding MODIS (Moderate-resolution Imaging Spectroradiometer) C6 AOD products shows similar spatial distributions in the Jing-Jin-Ji (Beijing–Tianjin–Hebei, China’s mega city cluster) region. The PARASOL AOD retrievals were compared against the AOD measurements of seven AERONET (Aerosol Robotic Network) stations in China to evaluate the performance of the retrieval algorithm. In the fine-particle-dominated regions, lower RMSEs were found at Beijing and Hefei urban stations (0.16 and 0.18, respectively) compared to those at other fine-particle-dominated AERONET stations, which can be attributed to the assumption of surface reflectance spectral shape invariance that has significant advantages in separating the contribution of surface and aerosol scattering in urban areas. For the FMF validation, an RMSE of 0.23, a correlation of 0.57, and a bias of −0.01 were found. These results show that the algorithm performs reasonably in distinguishing the contribution of fine and coarse particles. |
format |
Article in Journal/Newspaper |
author |
Shupeng Wang Li Fang Weishu Gong Weihe Wang Shihao Tang |
author_facet |
Shupeng Wang Li Fang Weishu Gong Weihe Wang Shihao Tang |
author_sort |
Shupeng Wang |
title |
Retrieval of Aerosol Optical Depth and FMF over East Asia from Directional Intensity and Polarization Measurements of PARASOL |
title_short |
Retrieval of Aerosol Optical Depth and FMF over East Asia from Directional Intensity and Polarization Measurements of PARASOL |
title_full |
Retrieval of Aerosol Optical Depth and FMF over East Asia from Directional Intensity and Polarization Measurements of PARASOL |
title_fullStr |
Retrieval of Aerosol Optical Depth and FMF over East Asia from Directional Intensity and Polarization Measurements of PARASOL |
title_full_unstemmed |
Retrieval of Aerosol Optical Depth and FMF over East Asia from Directional Intensity and Polarization Measurements of PARASOL |
title_sort |
retrieval of aerosol optical depth and fmf over east asia from directional intensity and polarization measurements of parasol |
publisher |
MDPI AG |
publishDate |
2023 |
url |
https://doi.org/10.3390/atmos15010006 https://doaj.org/article/7f35a902ab8344f589807ed60556eaf2 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmosphere, Vol 15, Iss 1, p 6 (2023) |
op_relation |
https://www.mdpi.com/2073-4433/15/1/6 https://doaj.org/toc/2073-4433 doi:10.3390/atmos15010006 2073-4433 https://doaj.org/article/7f35a902ab8344f589807ed60556eaf2 |
op_doi |
https://doi.org/10.3390/atmos15010006 |
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Atmosphere |
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15 |
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1 |
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6 |
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1792046739487719424 |