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Investigation of chemical and physical processes on Arctic aerosols through a combined approach of field and laboratory studies
Descriptive
TitleInfo
Title
Investigation of chemical and physical processes on Arctic aerosols through a combined approach of field and laboratory studies
Name
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Mukherjee
NamePart
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Pami
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1986-
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Pami Mukherjee
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author
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Gao
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Yuan
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Yuan Gao
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Advisory Committee
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chair
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Reinfelder
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John
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John Reinfelder
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Advisory Committee
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internal member
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Rouff
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Ashaki
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Ashaki Rouff
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Advisory Committee
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(authority = RULIB)
internal member
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Khalizov
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Alexei
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Alexei Khalizov
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Advisory Committee
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outside member
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Rutgers University
Role
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degree grantor
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Graduate School - Newark
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school
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Text
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theses
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2018
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2018-10
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2018
Place
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xx
Language
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eng
Abstract
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The causes and effects of recent global warming have been studied extensively; but, the role of atmospheric aerosols in the Arctic biogeochemistry has not been widely explored yet.
The water-soluble Arctic aerosols directly impact the climate by participating in cloud formation and influencing its radiative property. Moreover, the amplified Arctic warming may significantly influence the solubility and bio-availability of aerosol iron (Fe)—which is a limiting nutrient for phytoplankton growth, an important sink for atmospheric carbon dioxide (CO2).
This research investigates the chemical and physical processes on aerosols that were collected during the US Geotraces Arctic cruise in summer 2015 and natural snow samples from Newark, New Jersey in conjunction with laboratory experiments involving Fe minerals and organic ligands. We hypothesize that the Arctic aerosols were modified by various natural and anthropogenic processes, affecting the concentrations and hygroscopic properties of the cloud condensation nuclei and soluble Fe input to the Arctic Ocean.
Laboratory studies with hematite and major organic ligands showed that oxalate, when present above a threshold amount, had a significant effect on the absorptive dissolution of Fe. The results from the Arctic Ocean expedition showed that coarse mode sea-salt was the major aerosol component and non-sea-salt-sulfate was significantly present in fine mode aerosol particles. Among the organic species, oxalate, acetate, and formate were the major components among the species examined at the pole. Calcium was enriched on the sea-spray aerosols, pre-dominantly in the fine mode, leading to significant modification of the aerosol hygroscopic growth factor. Analysis of the natural snow and ice-melts showed that freezing could induce compaction and clustering of particles, but had negligible effect on modulating Fe solubility.
This study provides significant insight into the water soluble component of Arctic summer aerosols regarding their concentrations, sources, and possible formation mechanisms, and their effects on the Arctic climate via cloud formation. The laboratory based experiments increase our understanding of the effects of various processes occurring in Arctic aerosols—including the accumulation and reactions of organic components in aerosols and the freeze concentration effect on iron chemistry, which could affect the biogeochemical cycles in the Arctic Ocean.
The water-soluble Arctic aerosols directly impact the climate by participating in cloud formation and influencing its radiative property. Moreover, the amplified Arctic warming may significantly influence the solubility and bio-availability of aerosol iron (Fe)—which is a limiting nutrient for phytoplankton growth, an important sink for atmospheric carbon dioxide (CO2).
This research investigates the chemical and physical processes on aerosols that were collected during the US Geotraces Arctic cruise in summer 2015 and natural snow samples from Newark, New Jersey in conjunction with laboratory experiments involving Fe minerals and organic ligands. We hypothesize that the Arctic aerosols were modified by various natural and anthropogenic processes, affecting the concentrations and hygroscopic properties of the cloud condensation nuclei and soluble Fe input to the Arctic Ocean.
Laboratory studies with hematite and major organic ligands showed that oxalate, when present above a threshold amount, had a significant effect on the absorptive dissolution of Fe. The results from the Arctic Ocean expedition showed that coarse mode sea-salt was the major aerosol component and non-sea-salt-sulfate was significantly present in fine mode aerosol particles. Among the organic species, oxalate, acetate, and formate were the major components among the species examined at the pole. Calcium was enriched on the sea-spray aerosols, pre-dominantly in the fine mode, leading to significant modification of the aerosol hygroscopic growth factor. Analysis of the natural snow and ice-melts showed that freezing could induce compaction and clustering of particles, but had negligible effect on modulating Fe solubility.
This study provides significant insight into the water soluble component of Arctic summer aerosols regarding their concentrations, sources, and possible formation mechanisms, and their effects on the Arctic climate via cloud formation. The laboratory based experiments increase our understanding of the effects of various processes occurring in Arctic aerosols—including the accumulation and reactions of organic components in aerosols and the freeze concentration effect on iron chemistry, which could affect the biogeochemical cycles in the Arctic Ocean.
Subject
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Topic
Environmental Science
Subject
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Topic
Atmospheric aerosols
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Rutgers University Electronic Theses and Dissertations
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ETD_8935
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electronic resource
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1 online resource (160 pages : illustrations)
Note
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Ph.D.
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Includes bibliographical references
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by Pami Mukherjee
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Title
Graduate School - Newark Electronic Theses and Dissertations
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rucore10002600001
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doi:10.7282/t3-bmq6-q097
Genre
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ETD doctoral
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Rights
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The author owns the copyright to this work.
RightsHolder
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Name
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Mukherjee
GivenName
Pami
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Permission or license
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2018-04-20 10:55:19
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Pami Mukherjee
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Rutgers University. Graduate School - Newark
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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2018-10-31
DateTime
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2020-10-30
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after October 30th, 2020.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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