Investigating the role of deposition on the size distribution of near-surface dust flux during erosion events

Fernandes, Royston; Dupont, Sylvain; Lamaud, Éric

doi:10.1016/j.aeolia.2019.02.002

Cited by 19 publications

(27 citation statements)

References 36 publications

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“…In particular, insoluble mineral dust has been shown to be deposited either via wet (snow scavenging in the atmosphere) (Wolff et al, 1998;Breider et al, 2014), dry/wet (Koffman et al, 2014) or dry deposition (gravitational settling) (Li et al, 2010), depending on the location of the ice core site. Likewise, deposition of insoluble mineral dust has been shown to be enhanced under weak wind conditions, which favours the gravitational settling of dense particles (Fernandes et al, 2019). Both observations contrast with our results which show diatoms are not deposited under specific wind or precipitation regimes.…”

Section: Inter-annual Variabilitycontrasting

confidence: 99%

Marine diatoms in ice cores from the Antarctic Peninsula and Ellsworth Land, Antarctica – species diversity and regional variability

Tetzner

Thomas

Allen

2021

Preprint

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Abstract. The presence of marine microfossils (diatoms) in glacier ice and ice cores has been documented from numerous sites in Antarctica, Greenland, as well as from sites in the Andes and the Altai mountains, and attributed to entrainment and transport by winds. However, their presence and diversity in snow and ice, especially in polar regions, is not well documented and still poorly understood. Here we present the first data to resolve the regional and temporal distribution of diatoms in ice cores, spanning a 20 year period across four sites in the southern Antarctic Peninsula and Ellsworth Land, Antarctica. We assess the regional variability in diatom composition and abundance at annual and sub-annual resolution across all four sites. These data corroborate the dominance of contemporary marine diatoms in Antarctic Peninsula ice cores, reveal that the timing and amount of diatoms deposited vary between low and high elevation sites and support existing evidence that marine diatoms have the potential to yield a novel wind paleoenvironmental proxy for ice cores in the southern Antarctic Peninsula and Ellsworth Land.

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Section: Inter-annual Variabilitycontrasting

confidence: 99%

Marine diatoms in ice cores from the Antarctic Peninsula and Ellsworth Land, Antarctica – species diversity and regional variability

Tetzner

Thomas

Allen

2021

Preprint

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“…Following Fernandes et al. (2019), the energy for releasing dust particles is taken as a fraction ϵ d of the energy of the impacting saltator ( E imp ) lost to the surface ( ϵ fr E imp ), where ϵ fr is based on the splash scheme of Anderson and Haff (1991). The interparticle cohesive energy ( E coh , b ) of one dust particle of size d b is considered proportional to d b :

E_{c o h, b} = A d_{b}^{β}

, where A is a constant and the exponent β quantifies the surface bonding of the dust particles, with typical values between −0.02 and +3 (Fernandes et al., 2019).…”

Section: Methodsmentioning

confidence: 99%

“…(2019), the energy for releasing dust particles is taken as a fraction ϵ d of the energy of the impacting saltator ( E imp ) lost to the surface ( ϵ fr E imp ), where ϵ fr is based on the splash scheme of Anderson and Haff (1991). The interparticle cohesive energy ( E coh , b ) of one dust particle of size d b is considered proportional to d b :

E_{c o h, b} = A d_{b}^{β}

, where A is a constant and the exponent β quantifies the surface bonding of the dust particles, with typical values between −0.02 and +3 (Fernandes et al., 2019). Hence, the maximum number of dust particles of the b th bin released by an impacting saltator of size D is the ratio between the available energy for releasing dust ( ϵ d ϵ fr E imp , D ) and the energy required to overcome the interparticle cohesive energy of one dust particle of size d b (

A d_{b}^{β}

N_{e m i, b}^{m a x} false(D false) = \frac{ϵ_{d} ϵ_{f r} E_{i m p, D}}{A d_{b}^{β}} .

…”

Section: Methodsmentioning

confidence: 99%

“…The distribution of the dust particles available at the surface

P_{d} ()(, d_{b})

was derived from the size‐distribution of the measured 3‐m‐high dust flux during the 7 and 9 March events (Figure 1). The dust size sorting between the surface and 3‐m‐high dust fluxes was assumed negligible, the dust deposition being negligible for the 150‐m‐long fetch of the experiment (Fernandes et al., 2019).…”

Section: Methodsmentioning

confidence: 99%

“…Dust emission is purely driven by sandblasting. Following Fernandes et al (2019), the energy for releasing dust particles is taken as a fraction ϵ d of the energy of the impacting saltator (E imp ) lost to the surface (ϵ fr E imp ), where ϵ fr is based on the splash scheme of Anderson and Haff (1991). The interparticle cohesive energy (E coh,b ) of one dust particle of size d b is considered proportional to d b :…”

Section: Les Erosion Modelmentioning

confidence: 99%

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Origins of Turbulent Transport Dissimilarity Between Dust and Momentum in Semiarid Regions

2020

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Turbulent transport of mineral dust away from erodible plots is usually assumed similar to the momentum transport. However, observations from the WIND‐O‐V (WIND erOsion in presence of sparse Vegetation's) 2017 field experiment over an isolated flat surface in Tunisia showed a dissimilar turbulent transport between dust and momentum. Here, the origin of this dissimilarity is explored from a numerical experiment using a detailed physically based erosion model based on a large‐eddy simulation airflow model. Simulations support the findings of the WIND‐O‐V campaign, confirming the key role played by the dust emission intermittency to the transport dissimilarity with the momentum, this later one being more continuously absorbed at the surface. Simulations reveal that this dissimilarity diminishes with height as the intermittency of dust emission is progressively lost during the turbulent transport‐mixing process. With wind intensity, the dissimilarity diminishes as well, with dust emissions becoming more spatially homogeneous, and thus less intermittent. Our simulations further highlight the additional role played by the fetch length limitation of the erodible plot to the turbulent transport dissimilarity. In presence of a short fetch, the dissimilarity between dust and momentum turbulent transports increases with height as the dust flux footprint integrates dust emission conditions from different surrounding surfaces. This latter process depends on the characteristics of the surrounded surfaces and is expected to be significant in semiarid regions.

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Comparison of RegCM dust schemes by monitoring an aeolian dust transport episode

Kuzu

Yavuz

2021

Air Qual Atmos Health

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Investigating the role of deposition on the size distribution of near-surface dust flux during erosion events

Cited by 19 publications

References 36 publications

Marine diatoms in ice cores from the Antarctic Peninsula and Ellsworth Land, Antarctica – species diversity and regional variability

Marine diatoms in ice cores from the Antarctic Peninsula and Ellsworth Land, Antarctica – species diversity and regional variability

Origins of Turbulent Transport Dissimilarity Between Dust and Momentum in Semiarid Regions

Comparison of RegCM dust schemes by monitoring an aeolian dust transport episode

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