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https://doi.org/10.5194/acp-2020-921
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-921
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  06 Oct 2020

06 Oct 2020

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Long-term multi-source data analysis about the characteristics of aerosol optical properties and types over Australia

Xingchuan Yang, Chuanfeng Zhao, and Yikun Yang Xingchuan Yang et al.
  • State Key Laboratory of Earth Surface Processes and Resource Ecology, and College of Global Change and Earth System Science, Beijing Normal University, Beijing, China

Abstract. The spatiotemporal distributions of aerosol optical properties and major aerosol types, along with the vertical distribution of major aerosol types over Australia, are investigated based on multi-year AERONET observations at nine sites, the Moderate Resolution Imaging Spectroradiometer (MODIS), Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2), Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP), and back-trajectory analysis from the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT). The annual aerosol optical depth (AOD) at most sites showed increasing trends (0.002–0.028 yr−1) except for that at three sites of Canberra, Jabiru, and Lake Argyle, which showed decreasing trends (−0.004–−0.002 yr−1). In contrast, the annual Ångström exponent (AE) showed decreasing tendencies at most sites (−0.044–−0.005 yr−1). The results showed strong seasonal variations in AOD with high values in the austral spring and summer and relatively low values in the austral fall and winter, and weak seasonal variations in AE with the highest mean values in the austral spring at most sites. Spatially, the MODIS AOD showed obvious spatial heterogeneity with higher values appeared over the Australian tropical savanna regions, Lake Eyre Basin, and southeastern regions of Australia, while low values appeared over the arid regions in western Australia. Monthly averaged AOD increases from August to next austral spring peak (typically December–January), and decreases during the March–July. Classification of Australian aerosols revealed that the mixed type of aerosols (biomass burning and dust aerosol) are dominated in all seasons at nine sites, followed by biomass burning aerosol and dust aerosol. The MERRA-2 showed that carbonaceous over northern Australia, dust over central Australia, sulfate over densely populated northwestern and southeastern Australia, and sea salt over Australian coastal regions are the major types of atmospheric aerosols over Australia. The CALIPSO showed that polluted dust is the dominant aerosol type detected at heights 0.5–5 km during all seasons. Australian aerosol has similar source characteristics due to intercontinental transport of aerosols over Australia, especially for biomass burning and dust aerosols. However, the dust-prone characteristic of aerosol is more prominent over the central Australia, while the biomass burning-prone characteristic of aerosol is more prominent in northern Australia.

Xingchuan Yang et al.

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Short summary
We investigate the spatiotemporal distributions of aerosol optical properties and major aerosol types, along with the vertical distribution of the major aerosol types over Australia based on multi-source data. The results of this study provide significant information on aerosol optical properties in Australia, which can help understand the characteristics of aerosol optical properties in Australia along with their potential climate impacts.
We investigate the spatiotemporal distributions of aerosol optical properties and major aerosol...
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