Evaluation and Correction of the Ambient Particle Spectral Light Absorption Measured Using a Filter-based Aethalometer
Abstract Spectral light-absorption properties measured with an Aethalometer (AE; Model AE33; Magee Scientific) are widely used in radiative forcing studies and source appointment in China. However, considerable uncertainty regarding the measured absorption coefficient (σabs) exists because of the mu...
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| Format: | Article |
| Language: | English |
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Springer
2024-12-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.2019.10.0500 |
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| author | Gang Zhao Yingli Yu Ping Tian Jing Li Guo Song Chunsheng Zhao |
| author_facet | Gang Zhao Yingli Yu Ping Tian Jing Li Guo Song Chunsheng Zhao |
| author_sort | Gang Zhao |
| collection | DOAJ |
| description | Abstract Spectral light-absorption properties measured with an Aethalometer (AE; Model AE33; Magee Scientific) are widely used in radiative forcing studies and source appointment in China. However, considerable uncertainty regarding the measured absorption coefficient (σabs) exists because of the multiple-scattering effects, loading effects, and differences in filter tape. This study evaluated σabs by comparing the values measured with an AE33 using Tape 8050, an AE33 using Tape 8060 (which differs from Tape 8050 in material), and a three-wavelength photoacoustic soot spectrometer (PASS-3) during two field campaigns in eastern China. The results indicated that the AE33-measured σabs using either tape exceeded the PASS-3-measured value by approximately three times, mainly owing to the multiple-scattering effect. A wavelength-independent multiple-scattering compensation factor (2.90), which varies slightly (± 0.04) for eastern China, is recommended for these regions. When σabs was measured with the AE33 using Tape 8050, the value highly depended on the loading on the tape, which led to significant uncertainty and discontinuity in the absorption Å ngström exponent compared to using Tape 8060. A method was proposed to effectively correct the historical datasets of σabs and the absorption Å ngström exponent by using the AE33 with Tape 8050. This work provides insight into the quality of measured absorption data when filter-based measurement technology is applied. |
| format | Article |
| id | doaj-art-18ef2a23319d473b8bca7b9e4ca34951 |
| institution | Kabale University |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Springer |
| record_format | Article |
| series | Aerosol and Air Quality Research |
| spelling | doaj-art-18ef2a23319d473b8bca7b9e4ca349512025-02-09T12:19:23ZengSpringerAerosol and Air Quality Research1680-85842071-14092024-12-012081833184110.4209/aaqr.2019.10.0500Evaluation and Correction of the Ambient Particle Spectral Light Absorption Measured Using a Filter-based AethalometerGang Zhao0Yingli Yu1Ping Tian2Jing Li3Guo Song4Chunsheng Zhao5Department of Atmospheric and Oceanic Sciences, School of Physics, Peking UniversityDepartment of Atmospheric and Oceanic Sciences, School of Physics, Peking UniversityBeijing Key Laboratory of Cloud, Precipitation and Atmospheric Water ResourcesDepartment of Atmospheric and Oceanic Sciences, School of Physics, Peking UniversityCollege of Environmental Sciences and Engineering, Peking UniversityDepartment of Atmospheric and Oceanic Sciences, School of Physics, Peking UniversityAbstract Spectral light-absorption properties measured with an Aethalometer (AE; Model AE33; Magee Scientific) are widely used in radiative forcing studies and source appointment in China. However, considerable uncertainty regarding the measured absorption coefficient (σabs) exists because of the multiple-scattering effects, loading effects, and differences in filter tape. This study evaluated σabs by comparing the values measured with an AE33 using Tape 8050, an AE33 using Tape 8060 (which differs from Tape 8050 in material), and a three-wavelength photoacoustic soot spectrometer (PASS-3) during two field campaigns in eastern China. The results indicated that the AE33-measured σabs using either tape exceeded the PASS-3-measured value by approximately three times, mainly owing to the multiple-scattering effect. A wavelength-independent multiple-scattering compensation factor (2.90), which varies slightly (± 0.04) for eastern China, is recommended for these regions. When σabs was measured with the AE33 using Tape 8050, the value highly depended on the loading on the tape, which led to significant uncertainty and discontinuity in the absorption Å ngström exponent compared to using Tape 8060. A method was proposed to effectively correct the historical datasets of σabs and the absorption Å ngström exponent by using the AE33 with Tape 8050. This work provides insight into the quality of measured absorption data when filter-based measurement technology is applied.https://doi.org/10.4209/aaqr.2019.10.0500Black carbonAbsorptionMultiple-scattering compensationLoading effects |
| spellingShingle | Gang Zhao Yingli Yu Ping Tian Jing Li Guo Song Chunsheng Zhao Evaluation and Correction of the Ambient Particle Spectral Light Absorption Measured Using a Filter-based Aethalometer Aerosol and Air Quality Research Black carbon Absorption Multiple-scattering compensation Loading effects |
| title | Evaluation and Correction of the Ambient Particle Spectral Light Absorption Measured Using a Filter-based Aethalometer |
| title_full | Evaluation and Correction of the Ambient Particle Spectral Light Absorption Measured Using a Filter-based Aethalometer |
| title_fullStr | Evaluation and Correction of the Ambient Particle Spectral Light Absorption Measured Using a Filter-based Aethalometer |
| title_full_unstemmed | Evaluation and Correction of the Ambient Particle Spectral Light Absorption Measured Using a Filter-based Aethalometer |
| title_short | Evaluation and Correction of the Ambient Particle Spectral Light Absorption Measured Using a Filter-based Aethalometer |
| title_sort | evaluation and correction of the ambient particle spectral light absorption measured using a filter based aethalometer |
| topic | Black carbon Absorption Multiple-scattering compensation Loading effects |
| url | https://doi.org/10.4209/aaqr.2019.10.0500 |
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