Asian dust storms invaded Taiwan in springtime. During the Asian dust-storm periods, the dust particles suspended in the atmosphere could not only deteriorate the ambient air quality, mainly high particulate matter concentration and low visibility, but also cause severely adverse effects on human health. In this study, Asian dusts were sampled at Pencadores Islands and characterized the physical and chemical characteristics to investigate the influence of Asian dust storms. Due to its clean atmosphere, Pencadores Islands can be treated as one of the best air quality background sites in Taiwan. In this sampling campaign, five Asian dust storm episodes were observed at Pencadores Islands. Asian dusts transported to Taiwan along the east of China or the east ocean of China and invaded Taiwan from either the northeast or the northwest. The concentrations of atmospheric aerosols during Asian dust storm episodes were 2-3 times higher than the background level. The concentration of PM10 increased dramatically. The increase of PM10 concentration was mainly attributed to coarse particles. The ratio of coarse particles to fine particles for Asian dust storm periods was higher than those for non-Asian dust storm periods. From March to April, the concentration of PM10 increased due to sea-salt aerosol blow into atmosphere by strong eastwest monsoon. It suggested that, at Pencadores Islands, seawater was major chemical species of suspended particles. The concentration of F-, Cl-, Br-, NO3-, SO42-, Na+, Mg2+, and Ca2+ increased during Asian dust storm episodes indicated that pollutant would be transport by Asian dusts. The most possible chemical species in coarse particles would be MgSO4 and CaSO4. The carbon content of suspended particles increased dramatically. The increase of carbon content of coarse particles was mainly attributed to elemental carbon. The increase of carbon content of fine particles was mainly attributed to organic carbon from second reaction. The concentration of Al, K, Br-, Fe, and Ca increased during Asian dust storm episodes indicated that Asian dust storm would transport dusts to Pencadores Islands. The major pollution sources were mobile sources and dust sources at Pencadores Islands. During the Asian dust-storm periods, the percentages of industrial sources, seawater, and secondary aerosols increased dramatically.

Thesis (M.S.)--University of North Carolina Wilmington, 2009. / Title from PDF title page (February 17, 2010) Includes bibliographical references (p. 32-35)

No description available.

Thesis (Ph. D.)--University of Canterbury, 2009. / Typescript (photocopy). Includes bibliographical references. Also available via the World Wide Web.

Thesis (Ph. D.)--University of Southern California, 1991. / Includes bibliographical references (leaves 231-242).

Thesis--University of Miami. / Vita. Includes bibliographical references (p. 103-105).

Thesis (M.S. in Applied Science) Naval Postgraduate School, March 1997. / Thesis advisors, Chiu, Ching-Sang ; Smith, Kevin B. ADA331078. Includes bibliographical references (p. 33).

Thèse--Université de Zurich. / Vita. "Sources": p. [5]-9.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1937. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 214-222).

Submitted by Everaldo Pereira (pereira.evera@gmail.com) on 2017-02-18T13:56:55Z No. of bitstreams: 1 Tese_Renata_Rebouças_2010.pdf: 9510028 bytes, checksum: 7d99aaf4b19b394c00d24280b1b85181 (MD5) / Made available in DSpace on 2017-02-18T13:56:55Z (GMT). No. of bitstreams: 1 Tese_Renata_Rebouças_2010.pdf: 9510028 bytes, checksum: 7d99aaf4b19b394c00d24280b1b85181 (MD5) / O espaço marinho da plataforma continental soteropolitana apresenta diferentes usos, além de grande valor histórico pela presença de inúmeros naufrágios. O objetivo deste trabalho foi investigar a sedimentação holocênica na plataforma continental de Salvador (PCS), gerando um mapeamento dos substratos, em escala de detalhe, que possa servir de apoio a tomadas de decisão, assim como possibilitar uma compreensão adequada dos processos sedimentares atuantes no fundo. Foram analisadas a textura e a composição de cerca de 400 amostras de sedimentos coletadas na plataforma continental de Salvador (PCS). Através dessas análises foi possível identificar nove fácies sedimentares distribuídas sobre a PCS. As fácies siliciclásticas dividem-se em: (i) areia quartzosa, distribuída sobre o Banco de Santo Antônio (BSA), margens do Canal de Salvador e Canal de Santo Antônio; (ii) areia quartzosa com molusco e equinoderma, distribuída ao longo da plataforma interna de toda área de estudo; (iii) areia lamosa quartzosa com foraminífero e molusco, distribuída ao redor do BSA e parte do Canal de Santo Antônio; e (iv) areia cascalhosa quartzosa com briozoário, molusco e equinoderma, concentrada no eixo central e interior do Canal de Salvador. As fácies bioclásticas dividem-se em (i) areia lamosa biodetrítica com foraminífero e molusco, distribuídas ao longo do Plateau do Rio Vermelho, parte do canal de Santo Antônio, Baixo de Amaralina, Baixo da Boca do Rio e na quebra da plataforma em frente a esses baixos; (ii) areia cascalho-lamosa biodetrítica com alga coralina, briozoários e foraminíferos, distribuída no alto da Pituba a partir da isóbata de 45 m, na quebra da plataforma e no talude; (iii) cascalho areno-lamoso biodetrítico com alga coralina, equinodermo e briozoário, distribuído em um trecho da plataforma interna e no alto da Pituba até a isóbata de 45 m; (iv) cascalho areno-lamoso biodetrítico com alga coralina e equinodermo, no trecho externo do Alto de Itapuã; e (v) cascalho areno-lamoso biodetrítico com alga coralina, no trecho interno do Alto de Itapuã. As fácies de areia quartzosa distribuídas sobre o BSA e o Canal de Salvador são provavelmente de origem reliquiar, tendo o seu sedimento sofrido transporte eólico em um período em que a plataforma esteve exposta. Já a fácies de areia quartzosa com molusco e equinodermo encontrada na plataforma interna representa o avanço do prisma costeiro, estando em equilíbrio com os processos atuais. A distribuição das fácies bioclásticas dá-se nas plataformas média e externa, e é controlada pela presença de substratos duros e pela topografia, remanescentes de um paleorelevo formado em um - vii - período de nível de mar baixo, quando uma rede de drenagem se desenvolveu sobre a plataforma. A distribuição das fácies realizada neste trabalho permitiu identificar preliminarmente depósitos de granulados marinhos siliciclásticos e bioclásticos distribuídos sobre o Banco de Santo Antônio e Alto de Itapuã, respectivamente, que podem eventualmente ter potencialidade para a exploração econômica. / The continental shelf in front of the city of Salvador has different uses, and also a great historical value due to the presence of numerous shipwrecks.The aim of this study is to investigate the Holocene sedimentation on the continental shelf of Salvador (CSS) mapping their bottom sediments in detail scale. This knowledge will support decisions about their uses, as well as, enable a better understanding of the sedimentary processes operating in the continental shelf. We analyzed the texture and composition of 400 sediment samples collected on the CCS. Nine sedimentary facies were identified, among them, four are siliciclastic and five bioclastic. The siliciclastic facies are: (i) quartz sand, found mainly on the Santo Antonio Bank (SAB) and on the Salvador Channel; (ii) quartz sand with mollusc and echinoderms, found along the inner shelf; (iii) quartz muddy-sand with foraminifera and mollusc, found around the SAB; and (iv) quartz gravelly-sand with bryozoan, mollusc and echinoderms, found in the central axis of the Salvador Channel. The bioclastic facies are: (i) bioclastic muddy-sand with foraminifer and mollusk, found on the Rio Vermelho Plateau, in the central axis of the Santo Antônio Channel, on the Amaralina and Boca do Rio Depressions, and on the shelf-break in front of these depressions; (ii) bioclastic gravelly-muddy-sand with coralline algae, bryozoans and foraminifera, found on the the Pituba High outer part, shelf-break and slope; (iii) bioclastic sandy-muddy-gravel with coralline algae, echinoderm and bryozoan, found in the inner part of the Pituba High and in part of the inner shelf; (iv) bioclastic sandy-muddy-gravel with coralline algae and echinoderm, found on the Itapuã High outer part; and (v) bioclastic sandy-muddy-gravel with coralline algae, found on the Itapuã High inner part. The siliciclastic facies on the SAB and on the Salvador Channel are probably relict. The sediments were transported by wind, while the platform was exposed at a lowstand sea-level time.The siliciclastic facies found in the inner shelf seems to be in equilibrium with current processes, representing the shoreline progradation sediments.The distribution of bioclastic facies, mainly in the midle and outer shelf, was controlled by the presence of hard substrates and by the topography, which are remnants of a paleorelief formed in the Last Glacial Maximum, when a drainage network developed on the platform. - ix - The distribution of facies performed in this study allowed the identification of siliciclastic and bioclastic deposits, over the Santo Antonio Bank and Itapuã High, respectively, which may possibly have potential for economic exploitation.