Formation and evolution of biogenic secondary organic aerosol over a forest site in Japan

Han, Yuemei; Iwamoto, Yoko; Nakayama, Tomoki; Kawamura, Kimitaka; Mochida, Michihiro

doi:10.1002/2013jd020390

Cited by 18 publications

(46 citation statements)

References 106 publications

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“…The continental factor shows close similarities to the factors resolved by Setyan et al [] and Han et al [] and exhibits high fractions of m/z 29, 43, and 44 with a distinguishable peak at m/z 55. All three factors exhibit similar features as organic spectra of aerosol generated from VOCs of monoterpene‐emitting plants in chamber oxidation experiments (not shown, [ Kiendler‐Scharr et al , ]).…”

Section: Resultssupporting

confidence: 79%

“…The continental factor's mass spectral profile resembles SV‐OOA, which is known to originate from many types of sources [ Ng et al , ]; thus, the continental factor is either natural, anthropogenic, or some combination of both. While previous studies have resolved separate anthropogenic and natural factors in continental regions [e.g., Setyan et al , ; Han et al , ], we find that additional factors do not exhibit meaningful correlations with external tracers, nor do they improve PMF goodness‐of‐fit criteria; therefore, a single factor is attributed to continental aerosol in this study (i.e., Factor 1. See supporting information).…”

Section: Resultscontrasting

confidence: 78%

“…(a) Comparison of average SV‐OOA [ Ng et al , ], anthropogenic SV‐OOA measured in the Los Angeles Basin, CA [ Hersey et al , ], biogenic organic aerosol measured in Sacramento, CA [ Setyan et al , ], and biogenic organic aerosol measured in a Japanese boreal forest [ Han et al , ] to the continental factor resolved in this study. (b) Comparison of f 44 / f 43 for the continental factor resolved in this study to SV‐OOA factors resolved previously [ Ng et al , ; Hersey et al , ; Setyan et al , ; Han et al , ]. Note that f 43 and f 44 are calculated with the signal of 39 removed.…”

Section: Resultsmentioning

confidence: 99%

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Observations of continental biogenic impacts on marine aerosol and clouds off the coast of California

et al. 2014

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During the 2011 Eastern Pacific Emitted Aerosol Cloud Experiment (E‐PEACE) and 2013 Nucleation in California Experiment (NiCE) field campaigns, a predominantly organic aerosol (> 85% by mass) was observed in the free troposphere over marine stratocumulus off the coast of California. These particles originated from a densely forested region in the Northwestern United States. The organic mass spectrum resolved by positive matrix factorization is consistent with the mass spectra of previously measured biogenic organic aerosol. Particulate organic mass exhibits a latitudinal gradient that corresponds to the geographical distribution of vegetation density and composition, with the highest concentration over regions impacted by densely populated monoterpene sources. Due to meteorological conditions during summer months, cloud‐clearing events transport aerosol from the Northwestern United States into the free troposphere above marine stratocumulus. Based on the variation of meteorological variables with altitude, dry air containing enhanced biogenic organic aerosol is shown to entrain into the marine boundary layer. Fresh impacts on cloud water composition are observed north of San Francisco, CA which is consistent with fresh continental impacts on the marine atmosphere at higher latitudes. Continental aerosol size distributions are bimodal. Particles in the 100 nm mode are impacted by biogenic sources, while particles in the ∼ 30 nm mode may originate from fresh biogenic emissions. Continental aerosol in the 100 nm mode is cloud condensation nuclei active and may play a role in modulating marine stratocumulus microphysics.

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Section: Resultssupporting

confidence: 79%

Section: Resultscontrasting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

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Observations of continental biogenic impacts on marine aerosol and clouds off the coast of California

et al. 2014

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“…This assumption was based on the chemical composition observed using the AMS and filter analysis. During the daytime on NPF event days, the mass concentrations of organics in the Aitken‐mode range (vacuum aerodynamic diameter of 60–150 nm, which corresponds to around 43–106 nm in volume equivalent diameter) increased substantially, whereas those of sulfate did not markedly increase [ Han et al, ]. The mean of κ HTDMA,mw in the Aitken‐mode range and the mean of κ CCNC at three SSs during 0900–2100 JST on NPF event days were 0.12 ± 0.02 and 0.16 ± 0.06, respectively, which are regarded as the estimates of κ org at 85% RH and under supersaturated conditions, respectively.…”

Section: Resultsmentioning

confidence: 99%

Hygroscopicity and cloud condensation nucleus activity of forest aerosol particles during summer in Wakayama, Japan

et al. 2017

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Size‐resolved distributions of the hygroscopic growth factor (g) and the ratios of cloud condensation nuclei (CCN) to condensation nuclei were observed at a forest site during summer in Japan. The g distributions at 85% relative humidity were unimodal. During 0900–2100 Japan Standard Time (JST) on new particle formation (NPF) event days, less hygroscopic particles (g ~ 1.1) were dominant in the Aitken‐mode range and the CCN activation diameters of the aerosols were large. These results are explained by the substantial contribution from newly formed biogenic secondary organic aerosol (BSOA). Hygroscopicity parameter κ for newly formed Aitken particles, calculated from g and CCN activation diameters, were 0.12 and 0.16, respectively, which were estimated to be the κ of organics. The κ values of particles were higher during 2100–0900 JST on NPF event days, in which the aerosols were characterized by the dominance of large and more hygroscopic particles. The number fractions of CCN that were predicted from time‐ and size‐resolved g at 0.23% and 0.41% supersaturations better matched the measured values compared to the cases with the time‐averaged g and/or g for the bulk composition, which suggests that the differences in particle hygroscopicity with time and size are important to CCN activation. A cloud parcel model indicates that the contributions from less hygroscopic particles to the number concentrations of CCN and cloud droplets were potentially large during NPF event days, which suggests a marked contribution from locally formed BSOA particles alongside particles from background air.

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“…Lee et al: Substantial secondary organic aerosol formation in a coniferous forest pogenic influence was frequently observed during those studies, further complicating the SOA formation chemistry (e.g. Han et al, 2014;. In particular, it has been hypothesized that the interactions of BVOCs with anthropogenic pollutants contributed to high aerosol loadings in the southeastern US .…”

Section: Introductionmentioning

confidence: 97%

Substantial secondary organic aerosol formation in a coniferous forest: observations of both day- and nighttime chemistry

et al. 2016

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Abstract. Substantial biogenic secondary organic aerosol (BSOA) formation was investigated in a coniferous forest mountain region in Whistler, British Columbia. A largely biogenic aerosol growth episode was observed, providing a unique opportunity to investigate BSOA formation chemistry in a forested environment with limited influence from anthropogenic emissions. Positive matrix factorization of aerosol mass spectrometry (AMS) measurement identified two types of BSOA (BSOA-1 and BSOA-2), which were primarily generated by gas-phase oxidation of monoterpenes and perhaps sesquiterpenes. The temporal variations of BSOA-1 and BSOA-2 can be explained by gas-particle partitioning in response to ambient temperature and the relative importance of different oxidation mechanisms between day and night. While BSOA-1 arises from gas-phase ozonolysis and nitrate radical chemistry at night, BSOA-2 is likely less volatile than BSOA-1 and consists of products formed via gas-phase oxidation by OH radical and ozone during the day. Organic nitrates produced through nitrate radical chemistry can account for 22-33 % of BSOA-1 mass at night. The mass spectra of BSOA-1 and BSOA-2 have higher values of the mass fraction of m/z 91 (f 91 ) compared to the background organic aerosol. Using f 91 to evaluate BSOA formation pathways in this unpolluted, forested region, heterogeneous oxidation of BSOA-1 is a minor production pathway of BSOA-2.

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Formation and evolution of biogenic secondary organic aerosol over a forest site in Japan

Cited by 18 publications

References 106 publications

Observations of continental biogenic impacts on marine aerosol and clouds off the coast of California

Observations of continental biogenic impacts on marine aerosol and clouds off the coast of California

Hygroscopicity and cloud condensation nucleus activity of forest aerosol particles during summer in Wakayama, Japan

Substantial secondary organic aerosol formation in a coniferous forest: observations of both day- and nighttime chemistry

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