Unusual Sydney dust storm and its mineralogical and organic characteristics

Aryal, Rupak; Kandel, Dheeraj; Acharya, Durga P.; Chong, Meng Nan; Beecham, Simon

doi:10.1071/en12131

Cited by 30 publications

(24 citation statements)

References 62 publications

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“…In particular, although it is clear that substantial amounts of organic material can be found in dust aerosols emitted from fertile soils (e.g. Vega et al, 2001;Aryal et al, 2012;Chow et al, 2003;Rutter et al, 2011), budgets for mineral-dust-associated organic matter emitted into the atmosphere from soils have yet to be established.…”

Section: Discussionmentioning

confidence: 99%

Ice nucleation by fertile soil dusts: relative importance of mineral and biogenic components

et al. 2014

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Abstract. Agricultural dust emissions have been estimated to contribute around 20 % to the global dust burden. In contrast to dusts from arid source regions, the ice-nucleating abilities of which have been relatively well studied, soil dusts from fertile sources often contain a substantial fraction of organic matter. Using an experimental methodology which is sensitive to a wide range of ice nucleation efficiencies, we have characterised the immersion mode ice-nucleating activities of dusts (d < 11 µm) extracted from fertile soils collected at four locations around England. By controlling droplet sizes, which ranged in volume from 10 −12 to 10 −6 L (concentration = 0.02 to 0.1 wt % dust), we have been able to determine the ice nucleation behaviour of soil dust particles at temperatures ranging from 267 K (−6 • C) down to the homogeneous limit of freezing at about 237 K (−36 • C). At temperatures above 258 K (−15 • C) we find that the ice-nucleating activity of soil dusts is diminished by heat treatment or digestion with hydrogen peroxide, suggesting that a major fraction of the ice nuclei stems from biogenic components in the soil. However, below 258 K, we find that the ice active site densities tend towards those expected from the mineral components in the soils, suggesting that the inorganic fraction of soil dusts, in particular the K-feldspar fraction, becomes increasingly important in the initiation of the ice phase at lower temperatures. We conclude that dusts from agricultural activities could contribute significantly to atmospheric IN concentrations, if such dusts exhibit similar activities to those observed in the current laboratory study.

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Section: Discussionmentioning

confidence: 99%

Ice nucleation by fertile soil dusts: relative importance of mineral and biogenic components

et al. 2014

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“…During the period of study, a major dust storm occurred in September 2009 during the Australian Millennium drought (Aryal et al, 2012). Although dust storms occur frequently and lead to dust deposition and surface layer nutrient enrichment (Gabric et al, 2010), the September 2009 event is the only one associated with a significant maximum in the Chl-a concentration across the whole of the study region.…”

Section: Description Of the Study Sitementioning

confidence: 99%

Is the East Australian Current causing a marine ecological hot-spot and an important fisheries near Fraser Island, Australia?

Brieva

Ribbe

Lemckert

2015

Estuarine, Coastal and Shelf Science

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The distributions of Chlorophyll-a (Chl-a) blooms near the Fraser Island continental shelf along the east coast of Australia were analysed for the period 2002-2012. The blooms were found to exhibit two distinct quasiclimatological patterns. The first pattern was a broad near-coast mid-shelf distribution that prevailed from about March to July each year. The second pattern was established due to re-occurring outer-shelf Chl-a blooms southeast of Fraser Island from about August to February. The outer-shelf Chl-a bloom concentration maxima appeared to be higher than those associated with the near coast pattern. Both distributions were found to be characterised by significant year-to-year variability in the number of total blooms, the length of blooms and the Chl-a bloom concentration maxima. The physical cause of the outer-shelf Chl-a concentration maxima was of particular interest, since this location overlaps with a region previously identified as a key eastern Australian marine ecological site and important fisheries. In this analysis, we found that the area also overlaps with a hot-spot in EAC-generated bottom layer stress, which appears to be the main driver of the "Southeast Fraser Island Upwelling System".

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“…In this context, Aryal et al (2012) characterised the mineralogy and organic matter present in an atmospheric deposition sample collected in Sydney during the same 2009 dust storm. The analysis found that the dust storm contained aluminium and silicon along with around 10.6% organic carbon on weight basis.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of atmospheric deposited particles during a dust storm in urban areas of Eastern Australia

Gunawardena

Ziyath

Boström

et al. 2013

Science of The Total Environment

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The characteristics of dust particles deposited during the 2009 dust storm in the Gold Coast and Brisbane regions of Australia are discussed in this paper. The study outcomes provide important knowledge in relation to the potential impacts of dust storm related pollution on ecosystem health in the context that the frequency of dust storms is predicted to increase due to anthropogenic desert surface modifications and climate change impacts. The investigated dust storm contributed a large fraction of fine particles to the environment with an increased amount of total suspended solids, compared to dry deposition under ambient conditions. Although the dust storm passed over forested areas, the organic carbon content in the dust was relatively low. The primary metals present in the dust storm deposition were aluminium, iron and manganese, which are common soil minerals in Australia. The dust storm deposition did not contain significant loads of nickel, cadmium, copper and lead, which are commonly present in the urban environment. Furthermore, the comparison between the ambient and dust storm chromium and zinc loads suggested that these metals were contributed to the dust storm by local anthropogenic sources. The potential ecosystem health impacts of the 2009 dust storm include, increased fine solids deposition on ground surfaces resulting in an enhanced capacity to adsorb toxic pollutants as well as increased aluminium, iron and manganese loads. In contrast, the ecosystem health impacts related to organic carbon and other metals from dust storm atmospheric deposition are not considered to be significant.

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Unusual Sydney dust storm and its mineralogical and organic characteristics

Cited by 30 publications

References 62 publications

Ice nucleation by fertile soil dusts: relative importance of mineral and biogenic components

Ice nucleation by fertile soil dusts: relative importance of mineral and biogenic components

Is the East Australian Current causing a marine ecological hot-spot and an important fisheries near Fraser Island, Australia?

Characterisation of atmospheric deposited particles during a dust storm in urban areas of Eastern Australia

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