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Insight into Enceladus's Ocean Chemistry, Habitability, and Past from Fractionation Studies of the Erupting Plume
Insight into Enceladus's Ocean Chemistry, Habitability, and Past from Fractionation Studies of the Erupting Plume
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104651
- ISBN
- 9798288833373
- DDC
- 551
- 저자명
- Fifer, Lucas M.
- 서명/저자
- Insight into Enceladuss Ocean Chemistry, Habitability, and Past from Fractionation Studies of the Erupting Plume
- 발행사항
- [Sl] : University of Washington, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 106 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Catling, David C.
- 학위논문주기
- Thesis (Ph.D.)--University of Washington, 2025.
- 초록/해제
- 요약The erupting plume of Enceladus provides an ideal opportunity to investigate the chemistry and astrobiological potential of the subsurface ocean. However, the complexities of the eruption process likely result in a plume that is chemically fractionated and distinct from its ocean source. Chemical fractionation in the plume is not well understood, but it has ramifications for both extrapolation from plume measurements to ocean composition, and for long-term changes to the ocean chemistry due to preferential eruptive loss. In this work we (1) numerically model gas fractionation over the course of an Enceladus plume eruption, including gas exsolution from the ocean, (2) use laboratory experiments to constrain and validate our numerical models of gas exsolution, and (3) use models to investigate the long-term effects of plume eruption on Enceladus's bulk chemistry and constrain the longevity of plume eruption. We find that Enceladus's ocean is likely gas- and ammonium-rich and moderately alkaline, with free energy for methanogenesis. We also find that terrestrial models and measurements of mass transfer can generally be applied to carbon dioxide exsolution under Enceladus conditions, but may underestimate mass transfer coefficients of insoluble gases. Finally, we constrain overall timescales of plume eruption to 30-300 Myr and find that Enceladus's early ocean may have been carbon dioxide-rich and acidic, but was more likely ammonium-rich and basic. Our work advances our understanding of this small, dynamic moon and the nature of its ocean-plume connection, and provides tools for the interpretation of future spacecraft measurements at Enceladus.
- 일반주제명
- Geochemistry
- 일반주제명
- Planetology
- 일반주제명
- Physical chemistry
- 일반주제명
- Atmospheric chemistry
- 키워드
- Astrobiology
- 키워드
- Enceladus
- 키워드
- Plume
- 기타저자
- University of Washington Earth and Space Sciences
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202104651
■006m o d
■007cr#unu||||||||
■020 ▼a9798288833373
■035 ▼a(MiAaPQ)AAI32115302
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551
■1001 ▼aFifer, Lucas M.
■24510▼aInsight into Enceladus's Ocean Chemistry, Habitability, and Past from Fractionation Studies of the Erupting Plume
■260 ▼a[Sl]▼bUniversity of Washington▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a106 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Catling, David C.
■5021 ▼aThesis (Ph.D.)--University of Washington, 2025.
■520 ▼aThe erupting plume of Enceladus provides an ideal opportunity to investigate the chemistry and astrobiological potential of the subsurface ocean. However, the complexities of the eruption process likely result in a plume that is chemically fractionated and distinct from its ocean source. Chemical fractionation in the plume is not well understood, but it has ramifications for both extrapolation from plume measurements to ocean composition, and for long-term changes to the ocean chemistry due to preferential eruptive loss. In this work we (1) numerically model gas fractionation over the course of an Enceladus plume eruption, including gas exsolution from the ocean, (2) use laboratory experiments to constrain and validate our numerical models of gas exsolution, and (3) use models to investigate the long-term effects of plume eruption on Enceladus's bulk chemistry and constrain the longevity of plume eruption. We find that Enceladus's ocean is likely gas- and ammonium-rich and moderately alkaline, with free energy for methanogenesis. We also find that terrestrial models and measurements of mass transfer can generally be applied to carbon dioxide exsolution under Enceladus conditions, but may underestimate mass transfer coefficients of insoluble gases. Finally, we constrain overall timescales of plume eruption to 30-300 Myr and find that Enceladus's early ocean may have been carbon dioxide-rich and acidic, but was more likely ammonium-rich and basic. Our work advances our understanding of this small, dynamic moon and the nature of its ocean-plume connection, and provides tools for the interpretation of future spacecraft measurements at Enceladus.
■590 ▼aSchool code: 0250.
■650 4▼aGeochemistry
■650 4▼aPlanetology
■650 4▼aPhysical chemistry
■650 4▼aAtmospheric chemistry
■653 ▼aAqueous chemistry
■653 ▼aAstrobiology
■653 ▼aChemical fractionation
■653 ▼aEnceladus
■653 ▼aPlume
■690 ▼a0996
■690 ▼a0590
■690 ▼a0494
■690 ▼a0371
■71020▼aUniversity of Washington▼bEarth and Space Sciences.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0250
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358369▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
