Variations in the size distribution of non‐sea‐salt sulfate aerosol in the marine boundary layer at Barbados: Impact of African dust

Li-Jones, Xu; Prospero, Joseph M.

doi:10.1029/98jd00883

Cited by 144 publications

(108 citation statements)

References 51 publications

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“…The ratios of total light scattering coefficients at 550 nm were used to derive hygroscopic growth factors, which during dust-dominated events, were found to be in the range 1.18 to 1.39, although there are indications that this value contains a contribution from an electrolyte component. Li-Jones et al (1998) measured hygroscopic growth factors for mineral dust particles advected over the Atlantic Ocean. Aerosol scattering coefficients were measured using an integrating nephelometer and growth factors of 1.0 to 1.1 were estimated using data from periods of high dust concentration.…”

Section: Dma Resultsmentioning

confidence: 99%

A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

et al. 2005

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Abstract. The hygroscopicity of mineral aerosol samples has been examined by three independent methods: diffuse reflectance infrared Fourier transform spectroscopy, thermogravimetric analysis and differential mobility analysis. All three methods allow an evaluation of the water coverage of two samples, CaCO 3 and Arizona Test dust, as a function of relative humidity. For the first time, a correlation between absolute gravimetric measurements and the other two (indirect) methods has been established. Water uptake isotherms were reliably determined for both solids which at 298 K and 80% relative humidity exhibited similar coverages of ∼4 monolayers. However, the behaviour at low relative humidity was markedly different in the two cases, with Arizona Test Dust showing a substantially higher affinity for water in the contact layer. This is understandable in terms of the chemical composition of these two materials. The mobility analysis results are in good accord with field observations and with our own spectroscopic and gravimetric measurements. These findings are of value for an understanding of atmospheric chemical processes.

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Section: Dma Resultsmentioning

confidence: 99%

A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

et al. 2005

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“…Based on the presented results and some basic assumptions it is possible to estimate to what extent the minor concentration of refractory particulate matter is likely to influence the inferred CCN activity. It can be expected that significant amounts of the non-refractory PM in the studied size range is sulfate species (Li-Jones and Prospero, 1998). Pure ammonium sulfate and other inorganic sulfate species of atmospheric relevance have κ values of 0.6 or slightly higher when it comes to cloud droplet activation (κ CCN ).…”

Section: Summary and Discussionmentioning

confidence: 99%

Properties of cloud condensation nuclei (CCN) in the trade wind marine boundary layer of the western North Atlantic

et al. 2016

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Abstract. Cloud optical properties in the trade winds over the eastern Caribbean Sea have been shown to be sensitive to cloud condensation nuclei (CCN) concentrations. The objective of the current study was to investigate the CCN properties in the marine boundary layer (MBL) in the tropical western North Atlantic, in order to assess the respective roles of inorganic sulfate, organic species, long-range transported mineral dust and sea-salt particles.Measurements were carried out in June-July 2013, on the east coast of Barbados, and included CCN number concentrations, particle number size distributions and offline analysis of sampled particulate matter (PM) and sampled accumulation mode particles for an investigation of composition and mixing state with transmission electron microscopy (TEM) in combination with energy-dispersive X-ray spectroscopy (EDX).During most of the campaign, significant mass concentrations of long-range transported mineral dust was present in the PM, and influence from local island sources can be ruled out. The CCN and particle number concentrations were similar to what can be expected in pristine marine environments. The hygroscopicity parameter κ was inferred, and values in the range 0.2-0.5 were found during most of the campaign, with similar values for the Aitken and the accumulation mode. The accumulation mode particles studied with TEM were dominated by non-refractory material, and concentrations of mineral dust, sea salt and soot were too small to influence the CCN properties. It is highly likely that the CCN were dominated by a mixture of sulfate species and organic compounds.

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“…Furthermore, recent studies suggest that dust participates in important interactions with anthropogenic pollutants such as sulfur-dioxide (SO 2 -a source of sulfate aerosol). Such pollutants are often mixed into, and interact with, the dust plumes as they pass over urban/industrial sources (LiJones and Prospero, 1998;Heald et al, 2006). 6298 I. G. McKendry et al: Asian dust events at Whistler, BC Studies of trans-Pacific dust transport suggest a strong linkage between anthropogenic sulfate aerosol and crustal dust transport from Asia.…”

Section: Introductionmentioning

confidence: 99%

Trans-Pacific dust events observed at Whistler, British Columbia during INTEX-B

et al. 2008

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Abstract. The meteorology and physico-chemical characteristics of aerosol associated with two new cases of long range dust transport affecting western Canada during spring 2006 are described. Each event showed enhancements of both sulfate aerosol and crustal material of Asian origin. However, the events were of quite different character and demonstrate the highly variable nature of such events. The April event was a significant dust event with considerable enhancement of fine particle sulfate while the May event was a weaker dust event, also with significant fine particle sulfate enhancement. The latter event was notable in the sense that it was of short duration and was quickly followed by a large increase of organic material likely of regional origin. Comparison of these two events with other documented cases extending back to 1993, suggests that all dust events show coincident enhancements of sulfate and crustal aerosol. However, events vary across a wide continuum based on the magnitude of aerosol enhancements and their sulfate to calcium ratios. At one extreme, events are dominated by highly significant crustal enhancements (e.g. the well-documented 1998 and 2001 "dust" events) while at the other are events with some dust transport, but where sulfate enhancements are of very high magnitude (e.g. the 1993 event at Crater Lake and the 15 May 2006 event at Whistler). Other events represent a "mix". It is likely that this variability is a function of the comparative strengths of the dust and anthropogenic SO2 sources, the transport pathway and in particular the extent to which dust is transported across industrial SO2 sources, and finally, meteorological and chemical processes.

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Variations in the size distribution of non‐sea‐salt sulfate aerosol in the marine boundary layer at Barbados: Impact of African dust

Cited by 144 publications

References 51 publications

A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

Properties of cloud condensation nuclei (CCN) in the trade wind marine boundary layer of the western North Atlantic

Trans-Pacific dust events observed at Whistler, British Columbia during INTEX-B

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