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You searched for subject:(marine fine particles). Showing records 1 – 2 of 2 total matches.

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NSYSU

1. Chuang, Hsueh-Lung. Spatiotemporal Variation, Chemical Fingerprint, and Source Identification of Atmospheric Fine Particles Long-range Transported toward the Intersectional Region of Taiwan Strait and South China Sea.

Degree: Master, Environmental Engineering, 2016, NSYSU

The deterioration of ambient air quality across the Taiwan strait, including Chinese haze, Asian duststorms and Indochina biomass burning, is highly correlated with industrial emissions, natural soil weathering and swidden agriculture. Under certain meteorological conditions, air pollutants could be blown to the downwind countries/regions and cause poor ambient air quality. Previous literature reported that the northern prevailing winds commonly blow the haze originated from northern China to central and southern China, Taiwan, and even Dongsha Islands. Therefore, the intersectional region of Taiwan Strait and South China Sea is an important air quality monitoring site for long-range transportation. This study selected two PM2.5 sampling sites (i.e. Penghu Islands and Dongsha Islands) located at the intersectional region of Taiwan Strait and South China Sea. Twenty-four hour sampling of PM2.5 was simultaneously collected at Penghu Islands and Dongsha Islands for continuous 14 days in four seasons from summer 2015 to spring 2016. PM2.5 samples were simultaneously collected with BGI-PQ200. After sampling, PM2.5 samples were carried back to the laboratory for conditioning, weighing, and chemical analysis. The chemical composition of PM2.5 including water-soluble ionic species, metallic elements, carbonaceous contents, and anhydrosugar. Moreover, the potential sources of PM2.5 and their contribution were further identified by principal component analysis (PCA) and chemical mass balance (CMB) receptor model. Field sampling results indicated that the spatial distribution of PM2.5 concentration increased from south to north. The lowest seasonal averaged PM2.5 concentrations were observed in summer at both Penghu Islands and Dongsha Islands. PM2.5 concentrations increased gradually since fall, which might be influenced by the northeastern monsoons since air masses could be transported from the north toward Penghu Islands and Dongsha Islands. Air masses blown from South China Sea in summer were much cleaner than those blown from the north in fall, winter, and spring. Chemical analysis results showed that the most abundant water-soluble ionic species of PM2.5 were secondary inorganic aerosols (SIAs) including SO42-, NO3-, and NH4+ which accounted for 50~70% of water-soluble ions (WSIs). The most abundant metallic elements of PM2.5 were crustal elements (Mg, K, Ca, Fe, and Al), while anthropogenic elements (V, Cr, Mn, Ni, As, Cd, and Pb) concentration increased since fall. Organic carbon (OC) was the main species in all seasons, and OC/EC ratios increased during the northeastern monsoon periods. The levoglucosan concentrations in summer and fall were commonly lower than those in winter and spring, showing that PM2.5 concentrations were highly influenced by biomass burning in winter and spring. Correlation analysis results obtained from paired t test showed that the p values of PM2.5 concentration and chemical composition were 0.001 and 0.004, respectively, between two subtropic islands, showing that they had high correlation.… Advisors/Committee Members: Ying-I Tsai (chair), Chung-Shin Yuan (committee member), Wei-Hsiang Chen (chair), Chung-Hsuan Hung (chair).

Subjects/Keywords: correlation analysis; Intersectional region of Taiwan Strait and South China Sea; marine fine particles; cross-boundary transport; chemical fingerprint; source identification

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chuang, H. (2016). Spatiotemporal Variation, Chemical Fingerprint, and Source Identification of Atmospheric Fine Particles Long-range Transported toward the Intersectional Region of Taiwan Strait and South China Sea. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723116-103737

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Chuang, Hsueh-Lung. “Spatiotemporal Variation, Chemical Fingerprint, and Source Identification of Atmospheric Fine Particles Long-range Transported toward the Intersectional Region of Taiwan Strait and South China Sea.” 2016. Thesis, NSYSU. Accessed November 18, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723116-103737.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Chuang, Hsueh-Lung. “Spatiotemporal Variation, Chemical Fingerprint, and Source Identification of Atmospheric Fine Particles Long-range Transported toward the Intersectional Region of Taiwan Strait and South China Sea.” 2016. Web. 18 Nov 2019.

Vancouver:

Chuang H. Spatiotemporal Variation, Chemical Fingerprint, and Source Identification of Atmospheric Fine Particles Long-range Transported toward the Intersectional Region of Taiwan Strait and South China Sea. [Internet] [Thesis]. NSYSU; 2016. [cited 2019 Nov 18]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723116-103737.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chuang H. Spatiotemporal Variation, Chemical Fingerprint, and Source Identification of Atmospheric Fine Particles Long-range Transported toward the Intersectional Region of Taiwan Strait and South China Sea. [Thesis]. NSYSU; 2016. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723116-103737

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Queensland University of Technology

2. Johnson, Graham Richard. The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis.

Degree: 2005, Queensland University of Technology

Marine aerosols have attracted increasing attention over the past 15 years because of their potential significance for global climate modelling. The size distribution of these aerosols extends from super-micrometer sea salt mode particles down through 150 nm accumulation mode particles, 40 nm Aitken mode particles and nucleation mode particles which extend from 25 nm right down to clusters of a few molecules. The process by which the submicrometer modes form and grow and their composition have remained topics of debate throughout this time in large part because of the difficulties associated with determining their composition and relating it to proposed models of the formation process. The work compared the modality of marine aerosol influencing the South-east-Queensland region with that of other environmental aerosols in the region. The aerosol was found to be consistent with marine aerosols observed elsewhere with concentrations below 1000 cm-3 and frequently exhibiting the distinct bimodal structure associated with cloud processing, consisting of an Aitken mode at approximately 40 nm, an accumulation mode in the range 100-200 nm and a coarse mode attributed to sea salt between 600 and 1200 nm. This work included the development of two new techniques for aerosol research. The first technique measures aerosol density using a combination of aerosol size distribution and gravimetric mass concentration measurements. This technique was used to measure the density of a number of submicrometer aerosols including laboratory generated NaCl aerosol and ambient aerosol. The densities for the laboratory generated aerosols were found to be similar to those for the bulk materials used to produce them. The technique, extended to super-micrometer particle size range may find application in ambient aerosol research where it could be used to discriminate between periods when the aerosol is dominated by NaCl and periods when the density is more representative of crustal material or sulfates. The technique may also prove useful in laboratory or industrial settings for investigating particle density or in case where the composition is known, morphology and porosity. The second technique developed, integrates the existing physicochemical techniques of volatilisation and hygroscopic growth analysis to investigate particle composition in terms of both the volatilisation temperatures of the chemical constituents and their contribution to particle hygroscopic behaviour. The resulting volatilisation and humidification tandem differential mobility analyser or VH-TDMA, has proven to be a valuable research tool which is being used in ongoing research. Findings of investigations relating the composition of the submicrometer marine aerosol modes to candidate models for their formation are presented. Sea salt was not found in the numerically dominant particle type in coastal nucleation mode or marine Aitken and accumulation modes examined on the Southeast…

Subjects/Keywords: Aerosol size distribution; modality; environmental aerosols; marine aerosols; aerosol density; ambient aerosol; VH-TDMA; particle hygroscopic growth; volatility; iodine oxides; non sea salt sulfate; sea salt aerosols; coastal aerosol; marine biota; algae; photolysis; photochemical; thermal decomposition; volatilisation and humidification tandem differential mobility analyser; ultra fine particles.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Johnson, G. R. (2005). The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/16117/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Johnson, Graham Richard. “The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis.” 2005. Thesis, Queensland University of Technology. Accessed November 18, 2019. https://eprints.qut.edu.au/16117/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Johnson, Graham Richard. “The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis.” 2005. Web. 18 Nov 2019.

Vancouver:

Johnson GR. The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis. [Internet] [Thesis]. Queensland University of Technology; 2005. [cited 2019 Nov 18]. Available from: https://eprints.qut.edu.au/16117/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Johnson GR. The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis. [Thesis]. Queensland University of Technology; 2005. Available from: https://eprints.qut.edu.au/16117/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.