The ice-nucleating activity of African mineral dust in the Caribbean boundary layer

Harrison, Alexander D.; O’Sullivan, Daniel; Adams, Michael P.; Porter, Grace C. E.; Blades, Edmund; Brathwaite, Cherise; Chewitt-Lucas, Rebecca; Gaston, Cassandra J.; Hawker, Rachel; Krüger, Ovid O.; Neve, Leslie; Pöhlker, Mira L.; Pöhlker, Christopher; Pöschl, Ulrich; Sanchez-Marroquín, Alberto; Sealy, Andrea; Sealy, Peter; Tarn, Mark D.; Whitehall, Shanice; McQuaid, James B.; Carslaw, K. S.; Prospero, Joseph M.; Murray, Benjamin J.

doi:10.5194/acp-22-9663-2022

Cited by 12 publications

(21 citation statements)

References 106 publications

(199 reference statements)

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“…The singular ice-active site density approach has been used to describe both desert dust (Niemand et al, 2012;Ullrich et al, 2017;Reicher et al, 2018;Harrison et al, 2022) and the individual minerals in desert dust (Atkinson et al, 2013;Peckhaus et al, 2016;Harrison et al, 2019). Work over the last decade has demonstrated that the potassium-rich feldspars (K-feldspars) are the most active component of desert dust (Niedermeier et al, 2015;Harrison et al, 2019), a finding which contrasts with older reports where it was thought that the clay minerals dominated immersion mode freezing (Pruppacher and Klett, 2010).…”

Section: The Role Of Coarse and Super-coarse Dust Aerosols In Cloud G...mentioning

confidence: 99%

“…The concentration of dust particles that activate to ice at T, Mineral dust contains a variable quantity of K-feldspar, with desert dust particles typically containing between a few and a few tens of percent of feldspar (Atkinson et al, 2013;Perlwitz et al, 2015;Kandler et al, 2018;Harrison et al, 2022). In our calculations, we assume that the feldspar is externally mixed and that the surface area fraction is in proportion to the mass fraction of feldspar.…”

Section: The Role Of Coarse and Super-coarse Dust Aerosols In Cloud G...mentioning

confidence: 99%

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A review of coarse mineral dust in the Earth system

Adebiyi¹,

Kok²,

Murray³

et al. 2022

Preprint

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Mineral dust particles suspended in the atmosphere span more than three orders of magnitude in diameter, from less than 0.1 µm to more than 100 µm. This wide size range makes dust a unique aerosol species with the ability to interact with many aspects of the Earth system, including radiation, clouds, hydrology, atmospheric chemistry, and biogeochemistry. This review focuses on coarse and super-coarse dust aerosols, which we respectively define as dust particles with a diameter between 2.5 - 10 µm and 10 - 62.5 µm. We review several lines of observational evidence indicating that coarse and super-coarse dust particles are transported farther than previously expected and that the abundance of these particles is substantially underestimated in current global models. We synthesize previous studies that used observations, theories, and model simulations to highlight the impacts of coarse and super-coarse dust aerosols on the Earth system, including their effects on dust-radiation interactions, dust-cloud interactions, and atmospheric chemistry, and biogeochemistry. In addition, we examine several limitations in the representation of coarse and super-coarse dust aerosols in current model simulations and in remote-sensing retrievals. Because these limitations substantially contribute to the uncertainties in simulating the abundance and impacts of coarse and super-coarse dust aerosols, we offer some recommendations to facilitate future studies. Overall, we conclude that an accurate representation of coarse and super-coarse properties is critical in understanding the overall impacts of dust aerosols on the Earth system.

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Section: The Role Of Coarse and Super-coarse Dust Aerosols In Cloud G...mentioning

confidence: 99%

Section: The Role Of Coarse and Super-coarse Dust Aerosols In Cloud G...mentioning

confidence: 99%

A review of coarse mineral dust in the Earth system

Adebiyi¹,

Kok²,

Murray³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The singular ice-active site density approach has been used to describe both desert dust (Niemand et al, 2012;Ullrich et al, 2017;Reicher et al, 2018;Harrison et al, 2022) and the individual minerals in desert dust (Atkinson et al, 2013;Peckhaus et al, 2016;Harrison et al, 2019). Work over the last decade has demonstrated that the potassiumrich feldspars (K-feldspars) are the most active component of desert dust (Niedermeier et al, 2015;Harrison et al, 2019), a finding which contrasts with older reports where it was thought that the clay minerals dominated immersion mode freezing (Pruppacher and Klett, 2010).…”

Section: The Role Of Coarse and Super-coarse Dust Aerosols In Cloud G...mentioning

confidence: 99%

“…Mineral dust contains a variable quantity of K-feldspar, with desert dust particles typically containing between a few and a few tens of percent of feldspar (Atkinson et al, 2013;Perlwitz et al, 2015;Kandler et al, 2018;Harrison et al, 2022). In our calculations, we assume that the feldspar is externally mixed and that the surface area fraction is in proportion to the mass fraction of feldspar.…”

Section: The Role Of Coarse and Super-coarse Dust Aerosols In Cloud G...mentioning

confidence: 99%

A review of coarse mineral dust in the Earth system

et al. 2023

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“…According to Harrison et al (2022), the ice-nucleating activity of desert dust is also influenced by its mineralogy, which varies markedly between source areas and across particle sizes. The ice-nucleating activity of African desert dust was discovered to be significantly lower than parameterisations based on soil from specific locations in the Sahara or dust sedimented from dust storms by Harrison et al (2022) from analysis of samples from the summertime marine boundary layer of Barbados taken during July and August 2017. The authors concluded that the activity of dust in Barbados' boundary layer is largely defined by the low K-feldspar content of the dust, which is around 1 %.…”

Section: Activitymentioning

confidence: 99%

The Saharan dust plume: Current knowledge on the impact on health, human activities, and the ecosystem, with comments on research gaps

Olarewaju

Fajinmi

Davies

et al. 2023

Preprint

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A massive amount of dust estimated at a million tons is released from the Sahara Desert each year into the atmosphere and travels over the North Atlantic Ocean, commonly referred to as the Saharan dust plume (SDP). With its ability to travel over very long distances across the sea, the SDP is of enormous global importance, affecting climatic processes, and playing a significant role in nutrient cycles, sedimentary cycles, and soil development. On the other hand, from an environmental health perspective, the SDP degrades air quality, posing serious health threats to humans, especially to people with lung conditions. Recent literature documents health issues, including respiratory and cardiovascular diseases and even death in extreme cases. Despite this knowledge, large uncertainties exist in our ability to predict future trends in Saharan dust emissions and model-projected atmospheric circulation patterns. Employing a comprehensive search of the recent literature, this study reviews present knowledge of the sources, composition and propagation dynamics of the SDP and the impact of its contained atmospheric particulates on health, ecosystems, and human activities to be able to formulate credible mitigation measures and unveil areas where further research is needed for improving on these formulations. A comprehensive list of the more recent references (mainly post-dating 2010) is assembled to aid the search process of those wanting to contribute to filling these important knowledge gaps.

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The ice-nucleating activity of African mineral dust in the Caribbean boundary layer

Cited by 12 publications

References 106 publications

A review of coarse mineral dust in the Earth system

A review of coarse mineral dust in the Earth system

A review of coarse mineral dust in the Earth system

The Saharan dust plume: Current knowledge on the impact on health, human activities, and the ecosystem, with comments on research gaps

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