Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia
Asian dust particulate is one of the primary aerosol constituents in the Earth–atmosphere system that exerts profound influences on environmental quality, human health, the marine biogeochemical cycle, and Earth's climate. To date, the absorptive capacity of dust aerosol generated from the Asia...
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ftdoajarticles:oai:doaj.org/article:ae144f860d454d5faa176d579bce99fb 2023-05-15T13:06:57+02:00 Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia J. Bi J. Huang B. Holben G. Zhang 2016-12-01T00:00:00Z https://doi.org/10.5194/acp-16-15501-2016 https://doaj.org/article/ae144f860d454d5faa176d579bce99fb EN eng Copernicus Publications https://www.atmos-chem-phys.net/16/15501/2016/acp-16-15501-2016.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-16-15501-2016 1680-7316 1680-7324 https://doaj.org/article/ae144f860d454d5faa176d579bce99fb Atmospheric Chemistry and Physics, Vol 16, Pp 15501-15516 (2016) Physics QC1-999 Chemistry QD1-999 article 2016 ftdoajarticles https://doi.org/10.5194/acp-16-15501-2016 2022-12-31T00:29:43Z Asian dust particulate is one of the primary aerosol constituents in the Earth–atmosphere system that exerts profound influences on environmental quality, human health, the marine biogeochemical cycle, and Earth's climate. To date, the absorptive capacity of dust aerosol generated from the Asian desert region is still an open question. In this article, we compile columnar key absorption and optical properties of mineral dust over East and Central Asian areas by utilizing the multiyear quality-assured datasets observed at 13 sites of the Aerosol Robotic Network (AERONET). We identify two types of Asian dust according to threshold criteria from previously published literature. (1) The particles with high aerosol optical depth at 440 nm (AOD 440 ≥ 0.4) and a low Ångström wavelength exponent at 440–870 nm ( α < 0.2) are defined as Pure Dust (PDU), which decreases disturbance of other non-dust aerosols and keeps high accuracy of pure Asian dust. (2) The particles with AOD 440 ≥ 0.4 and 0.2 < α < 0.6 are designated as Transported Anthropogenic Dust (TDU), which is mainly dominated by dust aerosol and might mix with other anthropogenic aerosol types. Our results reveal that the primary components of high AOD days are predominantly dust over East and Central Asian regions, even if their variations rely on different sources, distance from the source, emission mechanisms, and meteorological characteristics. The overall mean and standard deviation of single-scattering albedo, asymmetry factor, real part and imaginary part of complex refractive index at 550 nm for Asian PDU are 0.935 ± 0.014, 0.742 ± 0.008, 1.526 ± 0.029, and 0.00226 ± 0.00056, respectively, while corresponding values are 0.921 ± 0.021, 0.723 ± 0.009, 1.521 ± 0.025, and 0.00364 ± 0.0014 for Asian TDU. Aerosol shortwave direct radiative effects at the top of the atmosphere (TOA), at the surface (SFC), and in the atmospheric layer (ATM) for Asian PDU ( α < 0.2) and TDU (0.2 < α < 0.6) computed in this study, are a factor of 2 smaller than ... Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Atmospheric Chemistry and Physics 16 24 15501 15516 |
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Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 J. Bi J. Huang B. Holben G. Zhang Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia |
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Physics QC1-999 Chemistry QD1-999 |
description |
Asian dust particulate is one of the primary aerosol constituents in the Earth–atmosphere system that exerts profound influences on environmental quality, human health, the marine biogeochemical cycle, and Earth's climate. To date, the absorptive capacity of dust aerosol generated from the Asian desert region is still an open question. In this article, we compile columnar key absorption and optical properties of mineral dust over East and Central Asian areas by utilizing the multiyear quality-assured datasets observed at 13 sites of the Aerosol Robotic Network (AERONET). We identify two types of Asian dust according to threshold criteria from previously published literature. (1) The particles with high aerosol optical depth at 440 nm (AOD 440 ≥ 0.4) and a low Ångström wavelength exponent at 440–870 nm ( α < 0.2) are defined as Pure Dust (PDU), which decreases disturbance of other non-dust aerosols and keeps high accuracy of pure Asian dust. (2) The particles with AOD 440 ≥ 0.4 and 0.2 < α < 0.6 are designated as Transported Anthropogenic Dust (TDU), which is mainly dominated by dust aerosol and might mix with other anthropogenic aerosol types. Our results reveal that the primary components of high AOD days are predominantly dust over East and Central Asian regions, even if their variations rely on different sources, distance from the source, emission mechanisms, and meteorological characteristics. The overall mean and standard deviation of single-scattering albedo, asymmetry factor, real part and imaginary part of complex refractive index at 550 nm for Asian PDU are 0.935 ± 0.014, 0.742 ± 0.008, 1.526 ± 0.029, and 0.00226 ± 0.00056, respectively, while corresponding values are 0.921 ± 0.021, 0.723 ± 0.009, 1.521 ± 0.025, and 0.00364 ± 0.0014 for Asian TDU. Aerosol shortwave direct radiative effects at the top of the atmosphere (TOA), at the surface (SFC), and in the atmospheric layer (ATM) for Asian PDU ( α < 0.2) and TDU (0.2 < α < 0.6) computed in this study, are a factor of 2 smaller than ... |
format |
Article in Journal/Newspaper |
author |
J. Bi J. Huang B. Holben G. Zhang |
author_facet |
J. Bi J. Huang B. Holben G. Zhang |
author_sort |
J. Bi |
title |
Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia |
title_short |
Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia |
title_full |
Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia |
title_fullStr |
Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia |
title_full_unstemmed |
Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia |
title_sort |
comparison of key absorption and optical properties between pure and transported anthropogenic dust over east and central asia |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/acp-16-15501-2016 https://doaj.org/article/ae144f860d454d5faa176d579bce99fb |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmospheric Chemistry and Physics, Vol 16, Pp 15501-15516 (2016) |
op_relation |
https://www.atmos-chem-phys.net/16/15501/2016/acp-16-15501-2016.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-16-15501-2016 1680-7316 1680-7324 https://doaj.org/article/ae144f860d454d5faa176d579bce99fb |
op_doi |
https://doi.org/10.5194/acp-16-15501-2016 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
16 |
container_issue |
24 |
container_start_page |
15501 |
op_container_end_page |
15516 |
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1766028156238561280 |