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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 Sma...
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  
Quasi-Geostrophic turbulence
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

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■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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