The great Sydney dust event: Size-resolved chemical composition and comparison

Box, Michael A.; Radhi, M.; Box, G. P.

doi:10.1088/1755-1315/11/1/012015

Cited by 6 publications

(9 citation statements)

References 10 publications

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“…To date, approximately 20 studies have been published on this particular event and a series of smaller dust storms that occurred throughout the month of September 2009. These papers have explored a range of dust‐related research areas such as respiratory health and air quality [ Holyoak et al ., ; Jayaratne et al ., ; Barnett et al ., 2012; Merrifield et al ., 2013; Aryal et al ., ], economic and aviation disruption [ Tozer , ; Baddock et al ., ; Tozer and Leys , ], aerosol remote sensing [ Li et al ., ; Tramutoli et al ., ; Jones and Christopher , ; De Deckker et al ., ], airflow modeling [ Gunawardena et al ., ], receptor site sampling and meteorology [ Leys et al ., ; McGowan and Soderholm , ], marine biology [ Hallegraeff et al ., ; Gabric et al ., ], and geochemistry [ Box et al ., ; Radhi et al ., ; Aryal et al ., ; Gunawardena et al ., ; De Deckker et al ., ; Reynolds et al ., ]. In contributing across a suite of geoscientific and environmental topics, these studies demonstrate the wide areas in which mineral dust has emerged as an important study area in Earth system science [ Shao et al ., ; Bryant , ].…”

Section: Introductionmentioning

confidence: 99%

Sources and pathways of dust during the Australian “Millennium Drought” decade

et al. 2017

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From the late 1990s to mid‐2010, Australia was affected by a prolonged period of drought, the “Millennium Drought,” during which numerous severe dust storms crossed the continent. We inspect this period to produce the first continental‐scale climatology of air‐parcel trajectories that is specific to dust and use it to gain new insights into dust transport dynamics over the eastern half of Australia. The analysis is based upon dust arrival times from airport meteorological observations made at nine mostly coastal cities for 2000–2009. The Hybrid Single‐Particle Lagrangian Integrated Trajectory model was used to calculate 1.26 million backward trajectories from receptor cities, with only those trajectories associated with a dust storm observation considered in the analysis of dust transport. To tie dust trajectories from receptors to likely emission sources, trajectories were linked to six known major dust source regions in and around the Lake Eyre Basin. The Lake Eyre North ephemeral lake system, alluvial‐dominated Channel Country, and agricultural Mallee‐Riverina regions emerge as important sources for the period, providing variable contributions to different parts of the seaboard as controlled by different front‐related wind systems. Our study also provides new detail regarding dust pathways from continental Australia. For the Millennium Drought we identify that the broadly established Southeast Dust Path may be more accurately subdivided into three active pathways, driven by prefrontal northerly winds and a variation in the influence of frontal westerlies. The detail of these pathways has implications for dust delivery from specific Australian sources to different marine environments.

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Section: Introductionmentioning

confidence: 99%

Sources and pathways of dust during the Australian “Millennium Drought” decade

et al. 2017

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“…This result suggested that the storm may have picked up the particles along the way in addition to its suspected origin, the Lake Eyre Basin, in inner Australia. [38][39][40] Surface morphology and elemental composition SEM and EDX measurements were performed to determine the dust particle size, shape and elemental composition. [41][42][43] The elemental composition and a backscattered electron image of the dust particles are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…A similar value was reported by Box et al in his study on the Sydney dust storm. [38] According to the literature, a ratio of more than 0.3 indicates a desert origin. [44,45] A previous study on the Lake Eyre Basin [39,40,46] supports the hypothesis of the dust origin.…”

Section: Resultsmentioning

confidence: 99%

Unusual Sydney dust storm and its mineralogical and organic characteristics

et al. 2012

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Environmental context. In 2009, at the end of the longest drought period ever recorded in Australia, a major dust storm blanketed the cities of Sydney and Brisbane for more than 24 h. The source of the dust was inner New South Wales and South Australia, where large scale open-cut mining occurs together with agricultural practices. We report results of extensive mineralogical and chemical analyses of the dust, and discuss their significance in terms of the dust origins and potential human health risks.Abstract. In a 24-h period from 23 to 24 September 2009, a dust storm passed over Sydney, Australia that produced a red sky and reduced the visibility to a few metres. It was Sydney's worst dust storm since 1942. During this period, the PM 10 (particles measuring 10 mm or less) value jumped from 50 to 11 800 mg m À3 . The dust storm was sampled and its mineralogical and organic contents were analysed. Four major particle sizes (0.6, 4.5, 9.3 and 20 mm) were observed in the dust. A multimodal particle distribution indicated a long range of dust transport. Mineralogical analysis showed that the particles were mainly composed of crustal elemental oxides of Al and Si. The ratio of Al/Si was 0.39 and the organic content was 10.6 %, which was found to be enriched with humic-type substances. The high Al/Si ratio (.0.3) indicated that the dust originated from desert land whereas the high organic content indicated that the particles were also derived from eroded agricultural land. A fluorescence spectroscopic study on the organic matter at excitation and emission wavelengths of 245-265 and 330-350 nm indicated that biohazardous substances were unlikely to be present in the dust.

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“…During haboob time periods, we employed a distinct mass distribution based on dust storm distributions from the literature (Box et al, 2010;Chen and Fryrear, 2002;Gillette et al, 1978;O'Hara et al, 2006). During dust events such as haboobs, much of the particulate mass is comprised of PM >10 (PM with d p > 10 µm).…”

Section: Dry Deposition Modelmentioning

confidence: 99%

The characterization of haboobs and the deposition of dust in Tempe, AZ from 2005 to 2014

2017

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Dust storms known as ‗haboobs' occur in Tempe, AZ during the North American monsoon season. This work presents a catalog of haboob occurrence over the time period 2005 to 2014. A classification method based on meteorological and air quality measurements is described. The major factors that distinguish haboobs events from other dust events and from background conditions are event minimum visibility, maximum wind or gust speed, and maximum PM 10 (particulate matter with aerodynamic diameters of 10 µm or less) concentration. We identified from 3 to 20 haboob events per year over the period from 2005 to 2014. The calculated annual TSP (total suspended particulate) dry deposition ranged from a low of 259 kg ha-1 in 2010 to a high of 2950 kg ha-1 in 2011 with a mean of 950 kg ha-1 yr-1. The deposition of large particles (PM >10) is greater than the deposition of PM 10. The TSP dry deposition during haboobs is estimated to contribute 74% of the total particulate mass deposited in Tempe.

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The great Sydney dust event: Size-resolved chemical composition and comparison

Cited by 6 publications

References 10 publications

Sources and pathways of dust during the Australian “Millennium Drought” decade

Sources and pathways of dust during the Australian “Millennium Drought” decade

Unusual Sydney dust storm and its mineralogical and organic characteristics

The characterization of haboobs and the deposition of dust in Tempe, AZ from 2005 to 2014

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