Long-term trends in aerosol properties derived from AERONET measurements
<p>Over the past 2 decades, remarkable changes in aerosol concentrations and compositions have been observed worldwide, especially over developing countries, potentially resulting in considerable changes in aerosol properties. The Aerosol Robotic Network (AERONET) offers high-precision measure...
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Copernicus Publications
2025-04-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/25/4617/2025/acp-25-4617-2025.pdf |
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| author | Z. Zhang J. Li H. Che Y. Dong O. Dubovik T. Eck T. Eck P. Gupta B. Holben J. Kim E. Lind T. Saud S. N. Tripathi T. Ying |
| author_facet | Z. Zhang J. Li H. Che Y. Dong O. Dubovik T. Eck T. Eck P. Gupta B. Holben J. Kim E. Lind T. Saud S. N. Tripathi T. Ying |
| author_sort | Z. Zhang |
| collection | DOAJ |
| description | <p>Over the past 2 decades, remarkable changes in aerosol concentrations and compositions have been observed worldwide, especially over developing countries, potentially resulting in considerable changes in aerosol properties. The Aerosol Robotic Network (AERONET) offers high-precision measurements of aerosol optical parameters over about 1700 stations globally, many of which have long-term measurements for 1 or more decades. Here we use AERONET Level 2.0 quality-assured measurements to investigate long-term aerosol optical depth (AOD) and Ångström exponent (AE) trends and quality-controlled Level 1.5 inversion products to analyse trends in absorption aerosol optical depth (AAOD) and single scattering albedo (SSA) at stations with long-term records. We also classify the aerosol properties in these sites into six types and analyse the trends in each type. Results reveal decreases in AOD over the majority of the stations, except for northern India and the Arabian Peninsula, where AOD increased. AE (computed from the AOD within the range of 440–870 nm) decreased in Europe, eastern North America, and the Middle East but increased over South Asia and western North America. The decreased AE over Europe and eastern North America is likely due to decreased fine-mode anthropogenic aerosols, whereas that over the Arabian Peninsula is attributed to increased dust activity. Conversely, increased AE over northern India is probably attributed to increased anthropogenic emissions and decreased dust loading. Most stations in Europe, North America, East Asia, and South Asia exhibit negative trends in AAOD, whereas Solar_Village in the Arabian Peninsula has positive trends. SSA at most stations increases and exhibits opposite trends to AAOD but with several stations in North America and central Europe showing decreased SSA values. Trend analysis of different aerosol types further reveals the changes in different aerosol components that are related to AOD, AE, AAOD, and SSA trends. The reductions in aerosols in eastern North America mainly result from non-absorbing species. Reductions in both fine-mode absorbing species and non-absorbing aerosols are found over Europe and East Asia, but the reduction in absorbing species is stronger than that of non-absorbing species. Increased aerosols in Kanpur over northern India should be mainly comprised of fine-mode scattering species, whereas those in Solar_Village over the Arabian Peninsula are mainly dust. The majority of stations exhibit consistent monotonic trends across different seasons for these parameters.</p> |
| format | Article |
| id | doaj-art-ca89ce8b9ee54ddc86887747fad2b7f6 |
| institution | OA Journals |
| issn | 1680-7316 1680-7324 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Copernicus Publications |
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| series | Atmospheric Chemistry and Physics |
| spelling | doaj-art-ca89ce8b9ee54ddc86887747fad2b7f62025-08-20T02:29:00ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242025-04-01254617463710.5194/acp-25-4617-2025Long-term trends in aerosol properties derived from AERONET measurementsZ. Zhang0J. Li1H. Che2Y. Dong3O. Dubovik4T. Eck5T. Eck6P. Gupta7B. Holben8J. Kim9E. Lind10T. Saud11S. N. Tripathi12T. Ying13Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, 100871, Beijing, ChinaLaboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, 100871, Beijing, ChinaState Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, China Meteorological Administration, 100081, Beijing, ChinaLaboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, 100871, Beijing, ChinaLaboratoire d'Optique Atmosphérique, CNRS/Université de Lille, Villeneuve-d'Ascq, 59650 Lille, FranceNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAGoddard Earth Sciences and Technology Center, University of Maryland Baltimore County, Baltimore, MD 21250, USANASA Goddard Space Flight Center, Greenbelt, MD 20771, USANASA Goddard Space Flight Center, Greenbelt, MD 20771, USADepartment of Atmospheric Science, Yonsei University, Seoul, 03722, Republic of KoreaNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAIndian Institute of Technology Kanpur, Kanpur, 208016, IndiaIndian Institute of Technology Kanpur, Kanpur, 208016, IndiaLaboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, 100871, Beijing, China<p>Over the past 2 decades, remarkable changes in aerosol concentrations and compositions have been observed worldwide, especially over developing countries, potentially resulting in considerable changes in aerosol properties. The Aerosol Robotic Network (AERONET) offers high-precision measurements of aerosol optical parameters over about 1700 stations globally, many of which have long-term measurements for 1 or more decades. Here we use AERONET Level 2.0 quality-assured measurements to investigate long-term aerosol optical depth (AOD) and Ångström exponent (AE) trends and quality-controlled Level 1.5 inversion products to analyse trends in absorption aerosol optical depth (AAOD) and single scattering albedo (SSA) at stations with long-term records. We also classify the aerosol properties in these sites into six types and analyse the trends in each type. Results reveal decreases in AOD over the majority of the stations, except for northern India and the Arabian Peninsula, where AOD increased. AE (computed from the AOD within the range of 440–870 nm) decreased in Europe, eastern North America, and the Middle East but increased over South Asia and western North America. The decreased AE over Europe and eastern North America is likely due to decreased fine-mode anthropogenic aerosols, whereas that over the Arabian Peninsula is attributed to increased dust activity. Conversely, increased AE over northern India is probably attributed to increased anthropogenic emissions and decreased dust loading. Most stations in Europe, North America, East Asia, and South Asia exhibit negative trends in AAOD, whereas Solar_Village in the Arabian Peninsula has positive trends. SSA at most stations increases and exhibits opposite trends to AAOD but with several stations in North America and central Europe showing decreased SSA values. Trend analysis of different aerosol types further reveals the changes in different aerosol components that are related to AOD, AE, AAOD, and SSA trends. The reductions in aerosols in eastern North America mainly result from non-absorbing species. Reductions in both fine-mode absorbing species and non-absorbing aerosols are found over Europe and East Asia, but the reduction in absorbing species is stronger than that of non-absorbing species. Increased aerosols in Kanpur over northern India should be mainly comprised of fine-mode scattering species, whereas those in Solar_Village over the Arabian Peninsula are mainly dust. The majority of stations exhibit consistent monotonic trends across different seasons for these parameters.</p>https://acp.copernicus.org/articles/25/4617/2025/acp-25-4617-2025.pdf |
| spellingShingle | Z. Zhang J. Li H. Che Y. Dong O. Dubovik T. Eck T. Eck P. Gupta B. Holben J. Kim E. Lind T. Saud S. N. Tripathi T. Ying Long-term trends in aerosol properties derived from AERONET measurements Atmospheric Chemistry and Physics |
| title | Long-term trends in aerosol properties derived from AERONET measurements |
| title_full | Long-term trends in aerosol properties derived from AERONET measurements |
| title_fullStr | Long-term trends in aerosol properties derived from AERONET measurements |
| title_full_unstemmed | Long-term trends in aerosol properties derived from AERONET measurements |
| title_short | Long-term trends in aerosol properties derived from AERONET measurements |
| title_sort | long term trends in aerosol properties derived from aeronet measurements |
| url | https://acp.copernicus.org/articles/25/4617/2025/acp-25-4617-2025.pdf |
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