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Asymptotic Corrections to Linear Models for the Physical Ocean at the Submesoscale and Smaller
Asymptotic Corrections to Linear Models for the Physical Ocean at the Submesoscale and Smaller
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104639
- ISBN
- 9798293886913
- DDC
- 519
- 저자명
- Du, Ryan Shijie.
- 서명/저자
- Asymptotic Corrections to Linear Models for the Physical Ocean at the Submesoscale and Smaller
- 발행사항
- [Sl] : New York University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 202 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Buhler, Oliver;Smith, Shafer.
- 학위논문주기
- Thesis (Ph.D.)--New York University, 2025.
- 초록/해제
- 요약Linear dominant balance models have been useful for modeling and understanding geophysical fluid dynamics phenomena in the turbulent ocean. They are usually justified by asymptotic analysis based on small nondimensional parameters. My thesis will study their nonlinear extensions in regimes where the linear models fail in some way.First, we will study the corrections to the linear dynamics of small-amplitude surface gravity waves at long timescales. This is the theory of weak wave turbulence. The model of Majda, McLaughlin, and Tabak (MMT) has been a useful 1D model for studying the essence of wave turbulence phenomena. However, a long-standing mystery is that the turbulence spectra from direct numerical simulations and those predicted by wave turbulence theory do not match. We resolve this open problem using theoretical arguments of scaling symmetry and high-resolution numerical forced-dissipative simulations. From our work, it is clear that the wave turbulence theory prediction is reached in the limit of a large inertial range for frequency.Second, we will explore corrections to the geostrophic theory of ocean turbulence. The celebrated Quasi-Geostrophic (QG) turbulence is based on small Rossby number asymptotic. At the ocean submesoscale O(1-30 km), the Rossby number can reach order unity. This leads to QG missing key observed statistics of the ocean submesoscale, like vorticity asymmetry and finite surface divergence. QG+1 was first proposed in the atmosphere literature to model the ageostrophic but balanced geophysical turbulence by extending the asymptotic to next-order in Rossby. In this thesis, we will reframe the model for the ocean. Simulations in key contexts of surface QG (SQG+1), Eady instability forced turbulence, and strain-induced frontogenesis demonstrate that QG+1 can model the ageostrophic features of the submesoscale turbulence at the ocean surface, beyond the QG model. In particular, the QG+1 model of a front blows up in finite time. We extend the QG+1 model to the shallow water system. The SWQG+1 system can capture the anticyclonic bias in freely decaying shallow water turbulence, as well as the ageostrophic features of shallow water baroclinic instability.
- 일반주제명
- Applied mathematics
- 일반주제명
- Mathematics
- 일반주제명
- Physical oceanography
- 키워드
- Frontogenesis
- 키워드
- Nonlinearity
- 키워드
- Spectra
- 키워드
- Submesoscale
- 키워드
- Turbulence
- 기타저자
- New York University Mathematics
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017358297
■00520260202104639
■006m o d
■007cr#unu||||||||
■020 ▼a9798293886913
■035 ▼a(MiAaPQ)AAI32113850
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a519
■1001 ▼aDu, Ryan Shijie.
■24510▼aAsymptotic Corrections to Linear Models for the Physical Ocean at the Submesoscale and Smaller
■260 ▼a[Sl]▼bNew York University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a202 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Buhler, Oliver;Smith, Shafer.
■5021 ▼aThesis (Ph.D.)--New York University, 2025.
■520 ▼aLinear dominant balance models have been useful for modeling and understanding geophysical fluid dynamics phenomena in the turbulent ocean. They are usually justified by asymptotic analysis based on small nondimensional parameters. My thesis will study their nonlinear extensions in regimes where the linear models fail in some way.First, we will study the corrections to the linear dynamics of small-amplitude surface gravity waves at long timescales. This is the theory of weak wave turbulence. The model of Majda, McLaughlin, and Tabak (MMT) has been a useful 1D model for studying the essence of wave turbulence phenomena. However, a long-standing mystery is that the turbulence spectra from direct numerical simulations and those predicted by wave turbulence theory do not match. We resolve this open problem using theoretical arguments of scaling symmetry and high-resolution numerical forced-dissipative simulations. From our work, it is clear that the wave turbulence theory prediction is reached in the limit of a large inertial range for frequency.Second, we will explore corrections to the geostrophic theory of ocean turbulence. The celebrated Quasi-Geostrophic (QG) turbulence is based on small Rossby number asymptotic. At the ocean submesoscale O(1-30 km), the Rossby number can reach order unity. This leads to QG missing key observed statistics of the ocean submesoscale, like vorticity asymmetry and finite surface divergence. QG+1 was first proposed in the atmosphere literature to model the ageostrophic but balanced geophysical turbulence by extending the asymptotic to next-order in Rossby. In this thesis, we will reframe the model for the ocean. Simulations in key contexts of surface QG (SQG+1), Eady instability forced turbulence, and strain-induced frontogenesis demonstrate that QG+1 can model the ageostrophic features of the submesoscale turbulence at the ocean surface, beyond the QG model. In particular, the QG+1 model of a front blows up in finite time. We extend the QG+1 model to the shallow water system. The SWQG+1 system can capture the anticyclonic bias in freely decaying shallow water turbulence, as well as the ageostrophic features of shallow water baroclinic instability.
■590 ▼aSchool code: 0146.
■650 4▼aApplied mathematics
■650 4▼aMathematics
■650 4▼aPhysical oceanography
■653 ▼aFrontogenesis
■653 ▼aNonlinearity
■653 ▼aQuasi-Geostrophic turbulence
■653 ▼aSpectra
■653 ▼aSubmesoscale
■653 ▼aTurbulence
■690 ▼a0364
■690 ▼a0405
■690 ▼a0415
■71020▼aNew York University▼bMathematics.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0146
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358297▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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