On the nature of nitrate in coarse continental aerosols

Wolff, George T.

doi:10.1016/0004-6981(84)90073-8

Cited by 177 publications

(75 citation statements)

References 34 publications

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“…Figure 3(a) shows the seasonal variation of the equivalent ratio Cl/Na, and chloride depletion occurs since nearly all values are less than that in seawater (1.17). The September maximum ratio for the nss-SO 4 /NO 3 ratio, Figure 3(b), coincides with the period of maximum chloride depletion, Figure 3(a), showing the importance of the reaction of H 2 SO 4 with coarse mode NaCl particles (Wolff, 1984). Note that the maximum of the seasonal variation of (nss-SO 4 + NO 3 )/NH 4 (Figure 3(c): frequently referred to as "acidity") in July does not coincide with the period of maximum chloride depletion.…”

Section: Seasonal Variations Of Components In Pm 10supporting

confidence: 58%

Inter-Relationships and Seasonal Variations of Inorganic Components of Pm10 in a Western Pacific Coastal City

Kan

Tanner

2005

Water Air Soil Pollut

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Abstract. Five year (1995Five year ( -1999 datasets for inorganic major and trace components in PM 10 from three monitoring sites in Hong Kong are presented. The concentrations of most chemical constituents show a high degree of seasonality, with high concentrations in winter but low ones in summer, resulting from the combined effects of summer monsoon scavenging and the influx of the continental air mass of the winter monsoon. High correlations exist within crustal components, as well as within sea-salt components. Non-seasalt sulphate and ammonium ion contributions to the PM 10 mass are similar at all sites and are greatest in the winter months, showing the importance of non-local contributions. The concentrations of chemical components in PM 10 from this study are compared with those in wet deposition in Hong Kong, as well as with PM 10 results from other countries. In general, the Asian countries experience more elevated concentrations of PM 10 .

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Section: Seasonal Variations Of Components In Pm 10supporting

confidence: 58%

Inter-Relationships and Seasonal Variations of Inorganic Components of Pm10 in a Western Pacific Coastal City

Kan

Tanner

2005

Water Air Soil Pollut

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“…coarse size aerosols show high DD velocity. It is reported (Momin et al, 1999) that NO 3 − over Pune exits in coarse size due to formation of Ca(NO 3 ) originated from reaction of HNO 3 − vapours with soil derived Ca 2+ or marine Na + (Wolff, 1984).…”

Section: Dry Deposition Velocitiesmentioning

confidence: 99%

Atmospheric Wet and Dry Depositions of Ions over an Urban Location in South-West India

Budhavant

Rao

Safai

et al. 2012

Aerosol Air Qual. Res.

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Wet deposition (WD) and Dry deposition (DD) samples were collected during a period of 4 year (2006 to 2009) + is higher (64-80%) than the DD flux at three locations and slightly lower (48%) at a high altitude location. In case of sea salt (Na and Cl), WD fluxes were higher (63-90%) than the DD fluxes at all the four locations. The dominant ion in DD was NO 3 − at Pashan (semi-urban) and Sinhagad (high altitude), Ca 2+ at Swargate (traffic junction) and SO 4 2− at Bhosari (industrial). The difference in deposition fluxes between the four sites was attributed to the effect of the local sources. Deposition velocities of SO 4 2− and NH 4 + were < 1 cm/s while Ca 2+ , Mg 2+ , Na + , K + , NO 3 − , and Cl − exhibited deposition velocities ≥ 1 cm/s. At one of the sites Pashan, where the earlier data is available; DD rates showed increase in all the chemical components, except for NH 4 + after a period of about 2 decades.

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“…HNO 3 may also react with Ca and Mg carbonates on soil particles to generate coarse mode soluble nitrates via the reaction (Wolf, 1984;Dasch and Cadle, 1990;Mamane and Gottlieb, 1992;Pakkanen et al, 1996):…”

Section: No −mentioning

confidence: 99%

Optical, physical and chemical characteristics of Australian continental aerosols: results from a field experiment

Radhi

Box

et al. 2010

Atmos. Chem. Phys.

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Abstract. Mineral dust is one of the major components of the world's aerosol mix, having a number of impacts within the Earth system. However, the climate forcing impact of mineral dust is currently poorly constrained, with even its sign uncertain. As Australian deserts are more reddish than those in the Northern Hemisphere, it is important to better understand the physical, chemical and optical properties of this important aerosol. We have investigated the properties of Australian desert dust at a site in SW Queensland, which is strongly influenced by both dust and biomass burning aerosol.Three years of ground-based monitoring of spectral optical thickness has provided a statistical picture of gross aerosol properties. The aerosol optical depth data showed a clear though moderate seasonal cycle with an annual mean of 0.06 ± 0.03. The Angstrom coefficient showed a stronger cycle, indicating the influence of the winter-spring burning season in Australia's north. AERONET size distributions showed a generally bimodal character, with the coarse mode assumed to be mineral dust, and the fine mode a mixture of fine dust, biomass burning and marine biogenic material.In November 2006 we undertook a field campaign which collected 4 sets of size-resolved aerosol samples for laboratory analysis -ion beam analysis and ion chromatography. Ion beam analysis was used to determine the elemental composition of all filter samples, although elemental ratios were considered the most reliable output. Scatter plots showed that Fe, Al and Ti were well correlated with Si, and Co reasonably well correlated with Si, with the Fe/Al ratio somewhat higher than values reported from Northern Hemisphere sites (as expected). Scatter plots for Ca, Mn and K against Si showed Correspondence to: M. A. Box (m.box@unsw.edu.au) clear evidence of a second population, which in some cases could be identified with a particular sample day or size fraction. These data may be used to attempt to build a signature of soil in this region of the Australian interior.Ion chromatography was used to quantify water soluble ions for 2 of our sample sets, complementing the picture provided by ion beam analysis. The strong similarities between the MSA and SO 2− 4 size distributions argue strongly for a marine origin of much of the SO 2− 4 . The similarity of the Na + , Cl − and Mg 2+ size distributions also argue for a marine contribution. Further, we believe that both NO are the result of surface reactions with appropriate gases.

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On the nature of nitrate in coarse continental aerosols

Cited by 177 publications

References 34 publications

Inter-Relationships and Seasonal Variations of Inorganic Components of Pm10 in a Western Pacific Coastal City

Inter-Relationships and Seasonal Variations of Inorganic Components of Pm10 in a Western Pacific Coastal City

Atmospheric Wet and Dry Depositions of Ions over an Urban Location in South-West India

Optical, physical and chemical characteristics of Australian continental aerosols: results from a field experiment

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