Using Raman Microspectroscopy to Determine Chemical Composition and Mixing State of Airborne Marine Aerosols over the Pacific Ocean

Deng, Chunhua; Brooks, Sarah D.; Vidaurre, German; Thornton, Daniel C. O.

doi:10.1080/02786826.2013.867297

Cited by 44 publications

(60 citation statements)

References 79 publications

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“…One possible explanation for the contradiction between our study and Shank et al (2012) is that the studies were conducted in different seasons with different meteorological conditions and microbial activity at the sea surface. Another possible explanation is that the AMS could not detect a significant fraction of refractory material (e.g., HULIS) found in primary marine OA over the study region (Deng et al, 2014). Our analysis of δ 13 C WSOC and organic molecular markers indicated that DOC in surface seawater contributed substantially to the submicron WSOC levels regardless of the oceanic area of the study region.…”

Section: Contribution Of Marine Oc Sources To the Wsoc Aerosolmentioning

confidence: 83%

“…4a and e). Deng et al (2014) also observed the lack of correlation between organics and Chl a over the eastern Pacific. They attributed it to the small variation in Chl a and the fact that aerosol composition is only sensitive to major changes in Chl a.…”

Section: Isotopic Characterization Of Aerosol Wsoc and Tcmentioning

confidence: 93%

“…Primary productivity in that oceanic region accounts for ∼ 23 % of the total productivity of the entire Pacific Ocean (Pennington et al, 2006), and the potential of enhanced OM in the surface microlayer is present. Deng et al (2014) found that long-chain organic molecules and humic-like substances (HULIS) were prevalent in the marine aerosol sampled in a latitudinal cruise over the eastern Pacific. Here we investigated possible sources of submicron WSOC over the oceanic region by the analysis of WSOC-specific 13 C combined with several organic molecular markers, such as monosaccharides (glucose and fructose) and low-molecular-weight (LMW) fatty acids (FAs).…”

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confidence: 99%

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Contribution of dissolved organic matter to submicron water-soluble organic aerosols in the marine boundary layer over the eastern equatorial Pacific

et al. 2016

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Abstract. Stable carbon isotopic compositions of watersoluble organic carbon (WSOC) and organic molecular markers were measured to investigate the relative contributions of the sea surface sources to the water-soluble fraction of submicron organic aerosols collected over the eastern equatorial Pacific during the Tropical Ocean tRoposphere Exchange of Reactive halogens and Oxygenated VOCs (TORERO)/KA-12-01 cruise. On average, the watersoluble organic fraction of the total carbon (TC) mass in submicron aerosols was ∼ 30-35 % in the oceans with the low chlorophyll a (Chl a) concentrations, whereas it was ∼ 60 % in the high-Chl a regions. The average stable carbon isotope ratio of WSOC (δ 13 C WSOC ) was −19.8 ± 2.0 ‰, which was systematically higher than that of TC (δ 13 C TC ) (−21.8 ± 1.4 ‰). We found that in the oceans with both high and low Chl a concentrations the δ 13 C WSOC was close to the typical values of δ 13 C for dissolved organic carbon (DOC), ranging from −22 to −20 ‰ in surface seawater of the tropical Pacific Ocean. This suggests an enrichment of marine biological products in WSOC aerosols in the study region regardless of the oceanic area. In particular, enhanced levels of WSOC and biogenic organic marker compounds together with high values of WSOC / TC (∼ 60 %) and δ 13 C WSOC were observed over upwelling areas and phytoplankton blooms, which was attributed to planktonic tissues being more enriched in δ 13 C. The δ 13 C analysis estimated that, on average, marine sources contribute ∼ 90 ± 25 % of the aerosol carbon, indicating the predominance of marine-derived carbon in the submicron WSOC. This conclusion is supported by Lagrangian trajectory analysis, which suggests that the majority of the sampling points on the ship had been exposed to marine boundary layer (MBL) air for more than 80 % of the time during the previous 7 days. The combined analysis of the δ 13 C and monosaccharides, such as glucose and fructose, demonstrated that DOC concentration was closely correlated with the concentration levels of submicron WSOC across the study region regardless of the oceanic area. The result implies that DOC may characterize background organic aerosols in the MBL over the study region.

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Section: Contribution Of Marine Oc Sources To the Wsoc Aerosolmentioning

confidence: 83%

Section: Isotopic Characterization Of Aerosol Wsoc and Tcmentioning

confidence: 93%

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confidence: 99%

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Contribution of dissolved organic matter to submicron water-soluble organic aerosols in the marine boundary layer over the eastern equatorial Pacific

et al. 2016

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“…This method was used in addition to the FTIR-HATR characterization in order to characterize how the surface and bulk of the samples changed due to oxidation. A similar method was utilized in previous work to characterize sample aging (Avzianova and Brooks, 2013;Deng et al, 2014;Avzianova and Brooks, 2014). It is theorized that oxidation of a solid sample will occurs at the surface of the particle due to slow internal mixing.…”

Section: Raman Microspectroscopymentioning

confidence: 99%

Role of Organic Hydrocarbons in Atmospheric Ice Formation via Contact Freezing

Collier

2016

J. Phys. Chem. A

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“…[4][5][6][7][8] Primary SSA is formed at the air-sea interface upon the rupturing of bubbles entrained from breaking waves. [9][10][11] The ability to better define the radiative effects of primary SSA particles will require that their chemical and physical characteristics, as well as their ability to act as cloud condensation nuclei, be established in more detail. With this goal in mind, efforts have focused on characterizing the chemical composition of bulk aerosol across a wide range of marine environments.…”

Section: Introductionmentioning

confidence: 99%

Molecular Diversity of Sea Spray Aerosol Particles: Impact of Ocean Biology on Particle Composition and Hygroscopicity

Cochran

Laskina

Trueblood

et al. 2017

Chem

146

252

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Sea spray aerosol (SSA) particles were found to be diverse with respect to their molecular composition. The number distribution of the SSA particle ensemble, as defined by the molecular signatures in individual particles, shifted in response to changes in the activity of phytoplankton and bacteria in the seawater. This dynamic shift in the molecular composition of individual SSA particles changes their hygroscopicity, a key climate-relevant property. SUMMARYThe impact of sea spray aerosol (SSA) on climate depends on the size and chemical composition of individual particles that make up the total SSA ensemble. There remains a lack of understanding as to the composition of individual particles within the SSA ensemble and how it changes in response to dynamic ocean biology. Here, we characterize the classes of organic compounds as well as specific molecules within individual SSA particles. The diversity of molecules within the organic fraction was observed to vary between submicrometer-and supermicrometer-sized particles and included contributions from fatty acids, monosaccharides, polysaccharides, and siliceous material. Significant changes in this molecular diversity were observed to coincide with the rise and fall of phytoplankton and heterotrophic bacteria populations within the seawater. Furthermore, the water uptake of individual particles was affected, as learned from studying the hygroscopicity of model systems composed of representative mixtures of salts and organic compounds.

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Using Raman Microspectroscopy to Determine Chemical Composition and Mixing State of Airborne Marine Aerosols over the Pacific Ocean

Cited by 44 publications

References 79 publications

Contribution of dissolved organic matter to submicron water-soluble organic aerosols in the marine boundary layer over the eastern equatorial Pacific

Contribution of dissolved organic matter to submicron water-soluble organic aerosols in the marine boundary layer over the eastern equatorial Pacific

Role of Organic Hydrocarbons in Atmospheric Ice Formation via Contact Freezing

Molecular Diversity of Sea Spray Aerosol Particles: Impact of Ocean Biology on Particle Composition and Hygroscopicity

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