Optical, physical and chemical properties of aerosols transported to a coastal site in the western Mediterranean: a focus on primary marine aerosols

Claeys, M.; Roberts, Greg; Mallet, Marc; Arndt, Jovanna; Sellegri, Karine; Sciare, Jean; Wenger, John C.; Sauvage, Bastien

doi:10.5194/acp-17-7891-2017

Cited by 20 publications

(10 citation statements)

References 90 publications

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“…The two sources of combustion identified by PMF, i.e. biomass burning and anthropogenic sources, have previously been observed in background aerosols in Corsica (Arndt et al, 2017;Claeys et al 2017). Concerning major nutrients, P deposition is highly associated to biomass burning inputs out of the most intense dust deposition events.…”

Section: Source Apportionment and Background Depositionmentioning

confidence: 84%

“…Thus, almost 50% of N fluxes is explained by the marine source. Several works observed that the depletion of chloride (Cl) and the simultaneous occurrence of NO3 in sea salt aerosol particles is due to the reaction between NaCl and HNO3 when maritime and anthropogenic air masses are mixed, in Mediterranean environments (Sellegri et al, 2001;Bardouki et al, 2003;Pey et al, 2009) and in particular in Corsica (Claeys et al, 2017). The contribution of marine source to N deposition is probably due to the deposition of these processed seasalt particles.…”

Section: Source Apportionment and Background Depositionmentioning

confidence: 99%

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Fluxes and sources of nutrients and trace metals atmospheric deposition in the northwestern Mediterranean

Desboeufs¹,

Nguyen²,

Chevaillier³

et al. 2018

Preprint

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<p><strong>Abstract.</strong> Total atmospheric deposition was collected on a weekly basis over 3.5-yr (March 2008&#8211;October 2011) at a remote coastal site on the west coast of Corsica Island. Deposition time series of macro and micro-nutrient (N, P, Si, Fe), and trace metals (As, Cr, Cu, Mn, Ni, V, Zn) are investigated in terms of variability and source apportionment (from fluxes of proxies for aerosol sources (Al, Ti, Ca, Na, Mg, S, Sr, K, Pb)). The highest fluxes are recorded for Si, P, then Fe for nutrients, and for Zn and Mn for trace metals. For the majority of elements, data show some weeks with high episodic fluxes, except for N, Cr and V which present the lowest variability. Twelve intense mineral dust deposition events are identified during the sampling period. The contribution of these events to the fluxes of Fe and Si represents 52&#8201;% and 57&#8201;% of their total fluxes, respectively, confirming the important role of these sporadic dust events on the inputs of these elements. For N and P, the contribution of these intense dust deposition events is lower and reaches 10 and 15&#8201;%, respectively. Out of these most intense events, positive matrix factorization (PMF) was applied to our total deposition database in order to identify the main sources of nutrients and trace metals deposited. Results show that P deposition is mainly associated to anthropogenic biomass burning inputs. For N deposition, inputs associated to marine sources (maybe associated to the reaction of anthropogenic N on NaCl particles) and anthropogenic sources are quasi-similar. A good correlation is obtained between N and S fluxes, supporting a common origin associated to the inorganic secondary aerosol, i.e. ammonium sulfate and ammonium nitrate. For trace metals, their origin is very variable: with a large contribution of natural dust sources for Ni or Mn and on the contrary of anthropogenic sources for V and Zn.</p>

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Section: Source Apportionment and Background Depositionmentioning

confidence: 84%

Section: Source Apportionment and Background Depositionmentioning

confidence: 99%

Fluxes and sources of nutrients and trace metals atmospheric deposition in the northwestern Mediterranean

Desboeufs¹,

Nguyen²,

Chevaillier³

et al. 2018

Preprint

View full text Add to dashboard Cite

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“…The biomass burning/waste source is mainly characterized by Cu, K, P, and Zn. K is commonly associated with waste/biomass burning or wood combustion (Dall'osto et al, 2013;. The maximum of this source deposition in summer, in spite of a minimum of rain, corresponds with the intense forest fires observed in the Mediterranean region in this period, and which impact the entire basin (Bossioli et al, 2016).…”

Section: Source Apportionment and Background Depositionmentioning

confidence: 99%

Fluxes and sources of nutrient and trace metal atmospheric deposition in the northwestern Mediterranean

et al. 2018

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Abstract. Total atmospheric deposition was collected on a weekly basis over 3.5 years (March 2008–October 2011) at a remote coastal site on the west coast of Corsica. Deposition time series of macro- and micronutrients (N, P, Si, Fe) and trace metals (As, Cr, Cu, Mn, Ni, V, Zn) are investigated in terms of variability and source apportionment (from fluxes of proxies for aerosol sources (Al, Ti, Ca, Na, Mg, S, Sr, K, Pb)). The highest fluxes are recorded for Si, P, and Fe for nutrients and Zn and Mn for trace metals. For the majority of elements, data show some weeks with high episodic fluxes, except for N, Cr, and V, which present the lowest variability. A total of 12 intense mineral dust deposition events are identified during the sampling period. The contribution of these events to the fluxes of Fe and Si represents 52 % and 57 % of their total fluxes, respectively, confirming the important role of these sporadic dust events in the inputs of these elements in the Mediterranean. For N and P, the contribution of these intense dust deposition events is lower and reaches 10 % and 15 %, respectively. Out of these most intense events, positive matrix factorization (PMF) was applied to our total deposition database in order to identify the main sources of nutrients and trace metals deposited. Results show that P deposition is mainly associated with anthropogenic biomass burning inputs. For N deposition, inputs associated with marine sources (maybe associated with the reaction of anthropogenic N on NaCl particles) and anthropogenic sources are quasi-similar. A good correlation is obtained between N and S fluxes, supporting a common origin associated with inorganic secondary aerosol, i.e., ammonium sulfate. For trace metals, their origin is very variable: with a large contribution of natural dust sources for Ni or Mn and conversely of anthropogenic sources for V and Zn.

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“…4.4.2). For organic aerosols, the gas-particle partitioning of the surrogates is computed using SOAP (Secondary Organic Aerosol Processor), assuming bulk equilibrium (Couvidat and Sartelet, 2015). The gas-particle partitioning of hydrophobic surrogates is modeled following Pankow (1994), with absorption by the organic phase (hydrophobic surrogates).…”

Section: Simulation Setups and Alternative Parameterizationsmentioning

confidence: 99%

Aerosol sources in the western Mediterranean during summertime: a model-based approach

et al. 2018

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Abstract. In the framework of ChArMEx (the Chemistry-Aerosol Mediterranean Experiment), the air quality model Polyphemus is used to understand the sources of inorganic and organic particles in the western Mediterranean and evaluate the uncertainties linked to the model parameters (meteorological fields, anthropogenic and sea-salt emissions and hypotheses related to the model representation of condensation/evaporation). The model is evaluated by comparisons to in situ aerosol measurements performed during three consecutive summers (2012, 2013 and 2014). The model-to-measurement comparisons concern the concentrations of PM10, PM1, organic matter in PM1 (OM1) and inorganic aerosol concentrations monitored at a remote site (Ersa) on Corsica Island, as well as airborne measurements performed above the western Mediterranean Sea. Organic particles are mostly from biogenic origin. The model parameterization of sea-salt emissions has been shown to strongly influence the concentrations of all particulate species (PM10, PM1, OM1 and inorganic concentrations). Although the emission of organic matter by the sea has been shown to be low, organic concentrations are influenced by sea-salt emissions; this is owing to the fact that they provide a mass onto which gaseous hydrophilic organic compounds can condense. PM10, PM1, OM1 are also very sensitive to meteorology, which affects not only the transport of pollutants but also natural emissions (biogenic and sea salt). To avoid large and unrealistic sea-salt concentrations, a parameterization with an adequate wind speed power law is chosen. Sulfate is shown to be strongly influenced by anthropogenic (ship) emissions. PM10, PM1, OM1 and sulfate concentrations are better described using the emission inventory with the best spatial description of ship emissions (EDGAR-HTAP). However, this is not true for nitrate, ammonium and chloride concentrations, which are very dependent on the hypotheses used in the model regarding condensation/evaporation. Model simulations show that sea-salt aerosols above the sea are not mixed with background transported aerosols. Taking the mixing state of particles with a dynamic approach to condensation/evaporation into account may be necessary to accurately represent inorganic aerosol concentrations.

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Optical, physical and chemical properties of aerosols transported to a coastal site in the western Mediterranean: a focus on primary marine aerosols

Cited by 20 publications

References 90 publications

Fluxes and sources of nutrients and trace metals atmospheric deposition in the northwestern Mediterranean

Fluxes and sources of nutrients and trace metals atmospheric deposition in the northwestern Mediterranean

Fluxes and sources of nutrient and trace metal atmospheric deposition in the northwestern Mediterranean

Aerosol sources in the western Mediterranean during summertime: a model-based approach

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