Seasonality in size segregated biogenic, anthropogenic and sea salt sulfate aerosols over the North Atlantic

Seguin, A.; Norman, Ann‐Lise; Eaton, Sarah; Wadleigh, Moire A.

doi:10.1016/j.atmosenv.2011.09.033

Cited by 16 publications

(31 citation statements)

References 23 publications

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“…Although wind is considered an important factor in the seaair exchange of sea salt, correlations in this study between wind speed and sea salt sulfate concentrations for coarse-and fine-mode aerosols were not significant (R 2 ∼ = 0.1), which is consistent with previous studies (Lewis and Schwartz, 2004;Rempillo et al, 2011;Seguin et al, 2011;Jaeglé et al, 2011).…”

Section: Sea Salt Sulfatesupporting

confidence: 81%

“…These methods may overestimate the role of biogenic sources if anthropogenic sulfate is present. The isotopic differences of various sources present a way to determine the oceanic DMS contribution to aerosol growth (Norman et al, 1999(Norman et al, , 2004Seguin et al, 2010Seguin et al, , 2011Rempillo et al, 2011). Sizesegregated aerosols were collected in July 2014 during an extended transect going from the strait of Belle Isle to Lancaster Sound in the Canadian Arctic, permitting comparison with measurements from other seasons.…”

Section: Introductionmentioning

confidence: 99%

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Biogenic, anthropogenic and sea salt sulfate size-segregated aerosols in the Arctic summer

et al. 2016

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Abstract. Size-segregated aerosol sulfate concentrations were measured on board the Canadian Coast Guard Ship (CCGS) Amundsen in the Arctic during July 2014. The objective of this study was to utilize the isotopic composition of sulfate to address the contribution of anthropogenic and biogenic sources of aerosols to the growth of the different aerosol size fractions in the Arctic atmosphere. Non-seasalt sulfate is divided into biogenic and anthropogenic sulfate using stable isotope apportionment techniques. A considerable amount of the average sulfate concentration in the fine aerosols with a diameter < 0.49 µm was from biogenic sources (> 63 %), which is higher than in previous Arctic studies measuring above the ocean during fall (< 15 %) (Rempillo et al., 2011) and total aerosol sulfate at higher latitudes at Alert in summer (> 30 %) (Norman et al., 1999). The anthropogenic sulfate concentration was less than that of biogenic sulfate, with potential sources being long-range transport and, more locally, the Amundsen's emissions. Despite attempts to minimize the influence of ship stack emissions, evidence from larger-sized particles demonstrates a contribution from local pollution.A comparison of δ 34 S values for SO 2 and fine aerosols was used to show that gas-to-particle conversion likely occurred during most sampling periods. δ 34 S values for SO 2 and fine aerosols were similar, suggesting the same source for SO 2 and aerosol sulfate, except for two samples with a relatively high anthropogenic fraction in particles < 0.49 µm in diameter (15)(16)(17). The high biogenic fraction of sulfate fine aerosol and similar isotope ratio values of these particles and SO 2 emphasize the role of marine organisms (e.g., phytoplankton, algae, bacteria) in the formation of fine particles above the Arctic Ocean during the productive summer months.

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Section: Sea Salt Sulfatesupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Biogenic, anthropogenic and sea salt sulfate size-segregated aerosols in the Arctic summer

et al. 2016

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“…Other particle types commonly measured around the Arctic Ocean include sea salt sulphate, Arctic haze particles such as non-sea-salt sulphate and soot/black carbon. Sea salt sulphate aerodynamic diameters have been measured in the North Atlantic greater than 0.95 µm but are lower in the springtime to a size less than 0.49 µm (Seguin et al, 2011). Non-sea-salt sulphate diameter ranges between 0.49 and 0.95 µm (Seguin et al, 2011).…”

Section: Particle Load and Mercury On The Sea Icementioning

confidence: 99%

“…Sea salt sulphate aerodynamic diameters have been measured in the North Atlantic greater than 0.95 µm but are lower in the springtime to a size less than 0.49 µm (Seguin et al, 2011). Non-sea-salt sulphate diameter ranges between 0.49 and 0.95 µm (Seguin et al, 2011). Another type of suspended particle reported around the Arctic Ocean is diamond dust Domine et al, 2011).…”

Section: Particle Load and Mercury On The Sea Icementioning

confidence: 99%

Atmospheric mercury over sea ice during the OASIS-2009 campaign

et al. 2013

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Measurements of gaseous elemental mercury (GEM), reactive gaseous mercury (RGM) and particulate mercury (PHg) were collected on the Beaufort Sea ice near Barrow, Alaska, in March 2009 as part of the Ocean-Atmosphere-Sea Ice-Snowpack (OASIS) and OASIS-Canada International Polar Year programmes. These results represent the first atmospheric mercury speciation measurements collected on the sea ice. Concentrations of PHg averaged 393.5 pg m⁻³ (range 47.1–900.1 pg m⁻³) and RGM concentrations averaged 30.1 pg m⁻³ (range 3.5–105.4 pg m⁻³) during the two-week-long study. The mean concentration of GEM during the study was 0.59 ng m⁻³ (range 0.01–1.51 ng m⁻³) and was depleted compared to annual Arctic ambient boundary layer concentrations. It is shown that when ozone (O₃) and bromine oxide (BrO) chemistry were active there is a positive linear relationship between GEM and O₃, a negative one between PHg and O₃, a positive correlation between RGM and BrO, and none between RGM and O₃. For the first time, GEM was measured simultaneously over the tundra and the sea ice. The results show a significant difference in the magnitude of the emission of GEM from the two locations, with significantly higher emission over the tundra. Elevated chloride levels in snow over sea ice are proposed to be the cause of lower GEM emissions over the sea ice because chloride has been shown to suppress photoreduction processes of RGM to GEM in snow. Since the snowpack on sea ice retains more mercury than inland snow, current models of the Arctic mercury cycle may greatly underestimate atmospheric deposition fluxes because they are based predominantly on land-based measurements. Land-based measurements of atmospheric mercury deposition may also underestimate the impacts of sea ice changes on the mercury cycle in the Arctic. The predicted changes in sea ice conditions and a more saline future snowpack in the Arctic could enhance retention of atmospherically deposited mercury and increase the amount of mercury entering the Arctic Ocean and coastal ecosystems

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“…So far, the source apportionment of the MBL aerosols has been performed with multiple indicators or methods such as isotopes Seguin et al, 2011;Seguin et al, 2010), transmission electron microscope (e.g. Bigg and Leck, 2008;Leck and Bigg, 1999;Leck and Bigg, 2005), cluster analysis Rebotier and Prather, 2007), principal component analysis (Decesari et al, 2011), and positive matrix factorization (PMF) method (Chang et al, 2011;20 Choi et al, 2017;Schmale et al, 2013a).…”

Section: Introductionmentioning

confidence: 99%

Source apportionment of the submicron organic aerosols over the Atlantic Ocean from 53° N to 53° S using HR-ToF-AMS

Huang

Poulain

et al. 2018

Preprint

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PM1 filter samples with a sampling time of 24 hours. Our measurements show that the MBL aerosol particle mass is controlled by sulfate (50%), followed by organics (21%), sea salt (12%), ammonium (9%), Black Carbon (BC, 5%) and nitrate (3%). Only sulfate exhibits pronouncedly seasonal dependency, while no such trend was observed in other species.Source apportionment of the organic fraction was performed using Positive Matrix Factorization (PMF). Five factors were 20 identified, including three marine sources and two non-marine sources. Marine sources are linked to primary production (19% of total organic aerosol (OA) mass), marine dimethylsulfide (DMS)-oxidation (16%), and amine-related secondary formation (16%). The other two OA components are attributed to continental outflow (19%) and aged ship exhausts -biomass burning emissions (30%). Our study indicates that, on average, non-marine sources nearly have the equal importance to the Atlantic aerosols comparing with the marine sources, respectively contributing 49% and 51% to the total OA mass loadings. The 25 South Atlantic atmosphere is found to be less polluted than the North according to our source analysis. Detailed latitudinal distribution of OA sources showed that DMS oxidation contributes remarkably to the MBL aerosol over the South Atlantic during spring, while continental pollutants largely contaminate the marine atmosphere when near the west and middle Africa (15°N~15°S) as well as Europe. Based on our measurements, SOA produced from DMS oxidation over the Atlantic can be estimated as MSA mass concentration times a scaling factor 1.79 for spring season, which is derived from the strong 30 correlation (R 2 >0.85) between MSA and DMS-oxidation OA component.Atmos. Chem. Phys. Discuss., https://doi

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Seasonality in size segregated biogenic, anthropogenic and sea salt sulfate aerosols over the North Atlantic

Cited by 16 publications

References 23 publications

Biogenic, anthropogenic and sea salt sulfate size-segregated aerosols in the Arctic summer

Biogenic, anthropogenic and sea salt sulfate size-segregated aerosols in the Arctic summer

Atmospheric mercury over sea ice during the OASIS-2009 campaign

Source apportionment of the submicron organic aerosols over the Atlantic Ocean from 53° N to 53° S using HR-ToF-AMS

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