東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Anthropogenic Impacts on Air Polluti...

Peng, Weihan.

FindBook

Google Book

Amazon

博客來

Anthropogenic Impacts on Air Pollution - From Primary Marine Emissions to Secondary Organic Aerosol Formation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Anthropogenic Impacts on Air Pollution - From Primary Marine Emissions to Secondary Organic Aerosol Formation./
作者:	Peng, Weihan.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	167 p.
附註:	Source: Dissertations Abstracts International, Volume: 82-05, Section: B.
Contained By:	Dissertations Abstracts International82-05B.
標題:	Environmental engineering. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28090246
ISBN:	9798684676291

Anthropogenic Impacts on Air Pollution - From Primary Marine Emissions to Secondary Organic Aerosol Formation.
Peng, Weihan.

Anthropogenic Impacts on Air Pollution - From Primary Marine Emissions to Secondary Organic Aerosol Formation. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 167 p.

Source: Dissertations Abstracts International, Volume: 82-05, Section: B.

Thesis (Ph.D.)--University of California, Riverside, 2020.

This item must not be sold to any third party vendors.

Anthropogenic air pollution consists of primary and secondary pollutants resulted from human activities. It is related to different environmental and health issues such as climate change, visibility and respiratory diseases.The maritime transport is an important source of anthropogenic primary air pollution. Natural gas (NG) vessels have become more widely used due to the more stringent emission regulations; however, emission data from NG maritime operations is still limited. This thesis conducted a comprehensive analysis on the air quality, health effects and climate change impacts of switching from diesel to NG. Results showed that PM2.5, NOx, CO2 were reduced by about 93%, 92% and 18%, respectively. However, HCHO and CH4 increased several-fold. A health risk assessment showed the diesel plume increased long-term health risk and the NG plume increased short-term health risk. A global warming potential (GWP) analysis was performed and revealed that the average NG exhaust GWP was increased by 38%. Mitigation strategies for further reducing pollutants from NG exhaust are discussed and showed potential for reducing short-term health and climate impacts.Anthropogenic secondary organic aerosol (SOA) is formed from the oxidation of volatile organic compounds (VOCs) such as aromatics and is critically impacted by NOx. Global transport models use the SOA parameters from the two major chemical pathways, RO2+NO and RO2+HO2 and the branching ratio of RO2+NO pathway (β), to predict SOA formation. This thesis attempted to improve the model prediction by experimentally investigating the SOA formation from those pathways with a novel approach of maintaining β constant throughout chamber experiments. At low-NOx conditions, multiple SOA yield curves were observed. The yield increased with HO2/RO¬2, indicating the contribution of RO2+RO2 pathway. The GEOS-Chem model showed that for the regions with high aromatic emissions but lower HO2/RO¬2, aromatic SOA was overestimated by up to 100%. At high-NOx conditions, SOA parameters were developed when controlling β at one during the chamber experiments to simulate the RO2+NO pathway without significant contribution from the other pathways. The global surface β was modelled using GEOS-Chem and four β scenarios were observed. SOA formation was investigated when simulating the daytime β profiles for those scenarios.

ISBN: 9798684676291Subjects--Topical Terms:

548583
Environmental engineering.
Subjects--Index Terms:

Aromatic

Anthropogenic Impacts on Air Pollution - From Primary Marine Emissions to Secondary Organic Aerosol Formation.
LDR:03609nmm a2200385 4500 001 2280276
005 20210830065531.5
008 220723s2020 ||||||||||||||||| ||eng d
020 $a 9798684676291
035 $a (MiAaPQ)AAI28090246
035 $a AAI28090246
040 $a MiAaPQ $c MiAaPQ
100 1 $a Peng, Weihan. $3 3558786
245 1 0 $a Anthropogenic Impacts on Air Pollution - From Primary Marine Emissions to Secondary Organic Aerosol Formation.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 167 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-05, Section: B.
500 $a Advisor: Cocker, David R., III.
502 $a Thesis (Ph.D.)--University of California, Riverside, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a Anthropogenic air pollution consists of primary and secondary pollutants resulted from human activities. It is related to different environmental and health issues such as climate change, visibility and respiratory diseases.The maritime transport is an important source of anthropogenic primary air pollution. Natural gas (NG) vessels have become more widely used due to the more stringent emission regulations; however, emission data from NG maritime operations is still limited. This thesis conducted a comprehensive analysis on the air quality, health effects and climate change impacts of switching from diesel to NG. Results showed that PM2.5, NOx, CO2 were reduced by about 93%, 92% and 18%, respectively. However, HCHO and CH4 increased several-fold. A health risk assessment showed the diesel plume increased long-term health risk and the NG plume increased short-term health risk. A global warming potential (GWP) analysis was performed and revealed that the average NG exhaust GWP was increased by 38%. Mitigation strategies for further reducing pollutants from NG exhaust are discussed and showed potential for reducing short-term health and climate impacts.Anthropogenic secondary organic aerosol (SOA) is formed from the oxidation of volatile organic compounds (VOCs) such as aromatics and is critically impacted by NOx. Global transport models use the SOA parameters from the two major chemical pathways, RO2+NO and RO2+HO2 and the branching ratio of RO2+NO pathway (β), to predict SOA formation. This thesis attempted to improve the model prediction by experimentally investigating the SOA formation from those pathways with a novel approach of maintaining β constant throughout chamber experiments. At low-NOx conditions, multiple SOA yield curves were observed. The yield increased with HO2/RO¬2, indicating the contribution of RO2+RO2 pathway. The GEOS-Chem model showed that for the regions with high aromatic emissions but lower HO2/RO¬2, aromatic SOA was overestimated by up to 100%. At high-NOx conditions, SOA parameters were developed when controlling β at one during the chamber experiments to simulate the RO2+NO pathway without significant contribution from the other pathways. The global surface β was modelled using GEOS-Chem and four β scenarios were observed. SOA formation was investigated when simulating the daytime β profiles for those scenarios.
590 $a School code: 0032.
650 4 $a Environmental engineering. $3 548583
650 4 $a Physical oceanography. $3 3168433
650 4 $a Atmospheric sciences. $3 3168354
653 $a Aromatic
653 $a Marine emissions
653 $a Natural gas
653 $a NOx
653 $a Secondary organic aerosol
653 $a SOA
690 $a 0775
690 $a 0415
690 $a 0725
710 2 $a University of California, Riverside. $b Chemical and Environmental Engineering. $3 1674133
773 0 $t Dissertations Abstracts International $g 82-05B.
790 $a 0032
791 $a Ph.D.
792 $a 2020
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28090246