Downs, Nathan and Butler, Harry and Parisi, Alfio (2016) Solar ultraviolet attenuation during the Australian (Red Dawn) dust event of 23 September 2009. Bulletin of the American Meteorological Society, 97 (11). pp. 2039-2050. ISSN 0003-0007
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Abstract
The large dust event of 23 September 2009 is recognized as the most significant on record in Australia since the 1940s. At its peak, reported hourly average particulate concentrations exceeded 15000 ugm-3, significantly exceeding the Australian National Air Quality Standard of 50 ugm-3 and daily September averages of 20 - 25 ugm-3. Measurements of the spectral surface ultraviolet irradiance monitored continuously before, after and during the event of 23 September 2009 are presented. These measurements highlight the significance of extreme dust load on the ultraviolet irradiance, and exceed previously published UV attenuations measured in Saharan and Chinese dust events. Measured spectral attenuations of up to 99.5% in the ultraviolet-B and 97.6% in the ultraviolet-A, were associated with the arrival of low altitude cumuliform cloud and the dust plume ahead of an approaching cold front on the morning of 23 September 2009. The data presented covers the period of maximum attenuation and the afternoon which had no cloud cover. This research characterizes for the first time the influence of a frontal desert dust storm on the surface ultraviolet irradiance in the naturally high ambient ultraviolet climate of sub-tropical Australia.
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| Item Type: | Article (Commonwealth Reporting Category C) |
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| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | First place winner for the USQ School-Specific 2016 Publication Excellence Awards for Journal Articles - School of Agricultural, Computational and Environmental Sciences. Published Version deposited in accordance with the copyright policy of the Publisher. See Publisher's Copyright Statement for further details: http://www.ametsoc.org/pubs/copyrightinfo/ams_copyright_policy_2010.pdf |
| Faculty / Department / School: | Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences |
| Date Deposited: | 13 May 2016 04:42 |
| Last Modified: | 12 Sep 2017 04:50 |
| Uncontrolled Keywords: | dust, UV irradiance, climate, atmosphere |
| Fields of Research : | 02 Physical Sciences > 0299 Other Physical Sciences > 029999 Physical Sciences not elsewhere classified 04 Earth Sciences > 0401 Atmospheric Sciences > 040101 Atmospheric Aerosols 04 Earth Sciences > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation |
| Socio-Economic Objective: | E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences D Environment > 96 Environment > 9602 Atmosphere and Weather > 960299 Atmosphere and Weather not elsewhere classified |
| Identification Number or DOI: | 10.1175/BAMS-D-15-00053.1 |
| URI: | http://eprints.usq.edu.au/id/eprint/29131 |
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- Solar ultraviolet attenuation during the Australian (Red Dawn) dust event of 23 September 2009. (deposited 13 May 2016 04:42) [Currently Displayed]
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