Hygroscopicity and composition of California CCN during summer 2010

Moore, Richard H.; Cerully, K. M.; Bahreini, R.; Brock, C. A.; Middlebrook, A. M.; Nenes, Athanasios

doi:10.1029/2011jd017352

Cited by 85 publications

(94 citation statements)

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“…Unfortunately, we had no size-resolved chemical aerosol measurements in our study period to look into this issue in more detail. In addition to the relative amounts of sulfate to organic material, the character of the organic material influences aerosol hygroscopic properties (e.g., Chang et al, 2010;Moore et al, 2012;Kuwata et al, 2013;Cerully et al, 2015) although the link is tenuous or highly variable. By making a PMF analysis for the organic material measured by the ACSM, we found three major contributing factors: the factor OOA representing oxygenated organic aerosol; the factor OOA-BB, which can be classified as processed biomass-burning organic aerosol; and the factor that resembles the SOA from α-pinene oxidation.…”

Section: Aerosol Chemical Composition Hygroscopicity and Ccn Activitymentioning

confidence: 99%

Atmospheric new particle formation as a source of CCN in the eastern Mediterranean marine boundary layer

et al. 2015

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Abstract. While cloud condensation nuclei (CCN) production associated with atmospheric new particle formation (NPF) is thought to be frequent throughout the continental boundary layers, few studies on this phenomenon in marine air exist. Here, based on simultaneous measurement of particle number size distributions, CCN properties and aerosol chemical composition, we present the first direct evidence on CCN production resulting from NPF in the eastern Mediterranean atmosphere. We show that condensation of both gaseous sulfuric acid and organic compounds from multiple sources leads to the rapid growth of nucleated particles to CCN sizes in this environment during the summertime. Sub-100 nm particles were found to be substantially less hygroscopic than larger particles during the period with active NPF and growth (the value of κ was lower by 0.2-0.4 for 60 nm particles compared with 120 nm particles), probably due to enrichment of organic material in the sub-100 nm size range. The aerosol hygroscopicity tended to be at minimum just before the noon and at maximum in the afternoon, which was very likely due to the higher sulfate-to-organic ratios and higher degree of oxidation of the organic material during the afternoon. Simultaneous with the formation of new particles during daytime, particles formed during the previous day or even earlier were growing into the size range relevant to cloud droplet activation, and the particles formed in the atmosphere were possibly mixed with long-range-transported particles.

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Section: Aerosol Chemical Composition Hygroscopicity and Ccn Activitymentioning

confidence: 99%

Atmospheric new particle formation as a source of CCN in the eastern Mediterranean marine boundary layer

et al. 2015

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“…During non-IOP periods, only the total nitrate mass concentration is available, all nitrate was assumed to be an organonitrate (Cerully et al, 2015;Lathem et al, 2013;Nenes et al, 1998;Zhang et al, 2005), and sulfate was fully neutralized by ammonium (see Sect. S4.2 in the Supplement for a sensitivity study of these assumptions for non-IOP periods).…”

Section: Derivation Of Organic Aerosol Hygroscopicitymentioning

confidence: 99%

“…However, atmospheric aerosols consist of a large number of organic compounds, which often dominate the total fine aerosol mass, especially in forested areas (e.g., de Sá et al, 2017a;Zhang et al, 2007). The hygroscopicity of aerosol organics (κ org ) have been examined in both laboratory (e.g., Asa-Awuku et al, 2009;Duplissy et al, 2011;King et al, 2009;Lambe et al, 2011;Massoli et al, 2010;Raymond and Pandis, 2003) and field studies (e.g., Cerully et al, 2015;Chang et al, 2010;Dusek et al, 2010;Gunthe et al, 2009;Lathem et al, 2013;Mei et al, 2013a, b;Moore et al, 2011Moore et al, , 2012Pöhlker et al, 2016;Rose et al, 2010;Shantz et al, 2008;Wang et al, 2008). Overall, these studies show that aerosol organics exhibit a wide range of κ values from 0 to ∼ 0.3, and κ org often increases substantially during aerosol aging in the atmosphere (e.g., Duplissy et al, 2011;Lambe et al, 2011;Massoli et al, 2010;Mei et al, 2013a, b).…”

Section: Introductionmentioning

confidence: 99%

CCN activity and organic hygroscopicity of aerosols downwind of an urban region in central Amazonia: seasonal and diel variations and impact of anthropogenic emissions

et al. 2017

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Abstract. During the Observations and Modeling of the Green Ocean Amazon (GoAmazon2014/5) campaign, sizeresolved cloud condensation nuclei (CCN) spectra were characterized at a research site (T3) 60 km downwind of the city of Manaus, Brazil, in central Amazonia for 1 year (12 March 2014 to 3 March 2015. Particle hygroscopicity (κ CCN ) and mixing state were derived from the size-resolved CCN spectra, and the hygroscopicity of the organic component of the aerosol (κ org ) was then calculated from κ CCN and concurrent chemical composition measurements. The annual average κ CCN increased from 0.13 at 75 nm to 0.17 at 171 nm, and the increase was largely due to an increase in sulfate volume fraction. During both wet and dry seasons, κ CCN , κ org , and particle composition under background conditions exhibited essentially no diel variations. The constant κ org of ∼ 0.15 is consistent with the largely uniform and high O : C value (∼ 0.8), indicating that the aerosols under background conditions are dominated by the aged regional aerosol particles consisting of highly oxygenated organic compounds. For air masses strongly influenced by urban pollution and/or local biomass burning, lower values of κ org and organic O : C atomic ratio were observed during night, due to accumulation of freshly emitted particles, dominated by primary organic aerosol (POA) with low hygroscopicity, within a shallow nocturnal boundary layer. The O : C, κ org , and κ CCN increased from the early morning hours and peaked around noon, driven by the formation and aging of secondary organic aerosol (SOA) and dilution of POA emissions into a deeperPublished by Copernicus Publications on behalf of the European Geosciences Union. 11780 R. Thalman et al.: CCN activity and organic hygroscopicity of aerosols downwind of an urban region boundary layer, while the development of the boundary layer, which leads to mixing with aged particles from the residual layer aloft, likely also contributed to the increases. The hygroscopicities associated with individual organic factors, derived from PMF (positive matrix factorization) analysis of AMS (aerosol mass spectrometry) spectra, were estimated through multivariable linear regression. For the SOA factors, the variation of the κ value with O : C agrees well with the linear relationship reported from earlier laboratory studies of SOA hygroscopicity. On the other hand, the variation in O : C of ambient aerosol organics is largely driven by the variation in the volume fractions of POA and SOA factors, which have very different O : C values. As POA factors have hygroscopicity values well below the linear relationship between SOA hygroscopicity and O : C, mixtures with different POA and SOA fractions exhibit a steeper slope for the increase in κ org with O : C, as observed during this and earlier field studies. This finding helps better understand and reconcile the differences in the relationships between κ org and O : C observed in laboratory and field studies, therefore providing a basis for improved parameterizati...

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“…Composition dependent collection efficiencies (CE) were calculated based on the method by Middlebrook et al (2012). Figure A4 compares aerosol mass concentrations measured by AMS to calculated aerosol mass concentrations from SMPS data before (left) and after (right) applying the CE correction factor.…”

Section: A2 Composition Measurements By Aerosol Mass Spectrometrymentioning

confidence: 99%

Ship impacts on the marine atmosphere: insights into the contribution of shipping emissions to the properties of marine aerosol and clouds

et al. 2012

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Abstract. We report properties of marine aerosol and clouds measured in the shipping lanes between Monterey Bay and San Francisco off the coast of Central California. Using a suite of aerosol instrumentation onboard the CIRPAS Twin Otter aircraft, these measurements represent a unique set of data contrasting the properties of clean and ship-impacted marine air masses in dry aerosol and cloud droplet residuals. Below-cloud aerosol exhibited average mass and number concentrations of 2 µg m −3 and 510 cm −3 , respectively, which are consistent with previous studies performed off the coast of California. Enhancements in vanadium and cloud droplet number concentrations are observed concurrently with a decrease in cloud water pH, suggesting that periods of high aerosol loading are primarily linked to increased ship influence. Mass spectra from a compact time-of-flight Aerodyne aerosol mass spectrometer reveal an enhancement in the fraction of organic at m/z 42 (f 42 ) and 99 (f 99 ) in ship-impacted clouds. These ions are well correlated to each other (R 2 > 0.64) both in and out of cloud and constitute 14 % (f 44 ) and 3 % (f 99 ) of organic mass during periods of enhanced sulfate. High-resolution mass spectral analysis of these masses from ship measurements suggests that the ions responsible for this variation were oxidized, possibly due to cloud processing. We propose that the organic fractions of these ions be used as a metric for determining the extent to which cloud-processed ship emissions impact the marine atmosphere where (f 42 > 0.15; f 99 > 0.04) would imply heavy influence from shipping emissions, (0.05 < f 42 < 0.15; 0.01 < f 99 < 0.04) would imply moderate, but persistent, influences from ships, and (f 42 < 0.05; f 99 < 0.01) would imply clean, non-ship-influenced air.

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Hygroscopicity and composition of California CCN during summer 2010

Cited by 85 publications

References 100 publications

Atmospheric new particle formation as a source of CCN in the eastern Mediterranean marine boundary layer

Atmospheric new particle formation as a source of CCN in the eastern Mediterranean marine boundary layer

CCN activity and organic hygroscopicity of aerosols downwind of an urban region in central Amazonia: seasonal and diel variations and impact of anthropogenic emissions

Ship impacts on the marine atmosphere: insights into the contribution of shipping emissions to the properties of marine aerosol and clouds

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