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Theory and Idealized Modeling of the Madden-Julian Oscillation
Theory and Idealized Modeling of the Madden-Julian Oscillation
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104648
- ISBN
- 9798293894543
- DDC
- 551.5
- 서명/저자
- Theory and Idealized Modeling of the Madden-Julian Oscillation
- 발행사항
- [Sl] : Princeton University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 252 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 주기사항
- Advisor: Ming, Yi.
- 학위논문주기
- Thesis (Ph.D.)--Princeton University, 2025.
- 초록/해제
- 요약This thesis describes some theoretical and numerical modeling work with the aim of elucidating the dynamics of the Madden-Julian Oscillation (MJO) and convectively-coupled equatorial waves (CCEWs). The first component of the thesis is a linear stability analysis of a simple system of equations with relevance for the MJO and CCEWs. Through the application of formal asymptotic methods, it is shown that certain parameter regimes of the linear system are absolutely unstable, and will grow along a stationary characteristic. It is then shown analytically that in zonally-varying basic states, exponentially localized regions of instability may be formed around a global minimum of the gross moist stability. The resulting local instability has a zonal structure which shares some similarities with the manner in which the MJO develops as it transits the Indo-Pacific warm pool.The remaining chapters are centered around experiments with an idealized general circulation model. The model consists of a spectral dynamical core with a basic treatment of the hydrological cycle coupled to a slab ocean layer. When this model is augmented with a zonally asymmetric oceanic energy flux, so as to force zonal temperature gradients in the tropics, strong MJO events emerge as a result. The dynamical structure of these MJO events bears considerable resemblance to observations, and the events display sensitivities consistent with past modeling studies. Next, the CCEW variability in the zonally symmetric configuration of the model is considered. It is shown that the westward-propagating disturbances present in the model owe their existence to a coupling between tropical convection and the free, external Rossby modes of the atmosphere at planetary wavenumbers 5 and 6. The final chapter shows that the MJO events produced by the model are sensitive to the magnitude of surface friction in the model. This sensitivity reveals many new insights into the nature of the MJO; a connection between the MJO and the Rossby modes discussed in the previous chapter is explored in great detail. It is suggested that dynamical nonlinearity plays a key role in the genesis of MJO events in the model.
- 일반주제명
- Atmospheric sciences
- 일반주제명
- Climate change
- 일반주제명
- Geophysics
- 일반주제명
- Statistics
- 일반주제명
- Meteorology
- 키워드
- Rossby modes
- 기타저자
- Princeton University Atmospheric and Oceanic Sciences
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798293894543
■035 ▼a(MiAaPQ)AAI32114776
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551.5
■1001 ▼aMacDonald, Cameron George.▼0(orcid)0000-0003-2459-2808
■24510▼aTheory and Idealized Modeling of the Madden-Julian Oscillation
■260 ▼a[Sl]▼bPrinceton University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a252 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Ming, Yi.
■5021 ▼aThesis (Ph.D.)--Princeton University, 2025.
■520 ▼aThis thesis describes some theoretical and numerical modeling work with the aim of elucidating the dynamics of the Madden-Julian Oscillation (MJO) and convectively-coupled equatorial waves (CCEWs). The first component of the thesis is a linear stability analysis of a simple system of equations with relevance for the MJO and CCEWs. Through the application of formal asymptotic methods, it is shown that certain parameter regimes of the linear system are absolutely unstable, and will grow along a stationary characteristic. It is then shown analytically that in zonally-varying basic states, exponentially localized regions of instability may be formed around a global minimum of the gross moist stability. The resulting local instability has a zonal structure which shares some similarities with the manner in which the MJO develops as it transits the Indo-Pacific warm pool.The remaining chapters are centered around experiments with an idealized general circulation model. The model consists of a spectral dynamical core with a basic treatment of the hydrological cycle coupled to a slab ocean layer. When this model is augmented with a zonally asymmetric oceanic energy flux, so as to force zonal temperature gradients in the tropics, strong MJO events emerge as a result. The dynamical structure of these MJO events bears considerable resemblance to observations, and the events display sensitivities consistent with past modeling studies. Next, the CCEW variability in the zonally symmetric configuration of the model is considered. It is shown that the westward-propagating disturbances present in the model owe their existence to a coupling between tropical convection and the free, external Rossby modes of the atmosphere at planetary wavenumbers 5 and 6. The final chapter shows that the MJO events produced by the model are sensitive to the magnitude of surface friction in the model. This sensitivity reveals many new insights into the nature of the MJO; a connection between the MJO and the Rossby modes discussed in the previous chapter is explored in great detail. It is suggested that dynamical nonlinearity plays a key role in the genesis of MJO events in the model.
■590 ▼aSchool code: 0181.
■650 4▼aAtmospheric sciences
■650 4▼aClimate change
■650 4▼aGeophysics
■650 4▼aStatistics
■650 4▼aMeteorology
■653 ▼aNumerical modeling work
■653 ▼aConvectively-coupled equatorial waves
■653 ▼aRossby modes
■653 ▼aMadden-Julian Oscillation
■653 ▼aAsymptotic methods
■690 ▼a0725
■690 ▼a0404
■690 ▼a0557
■690 ▼a0463
■690 ▼a0373
■71020▼aPrinceton University▼bAtmospheric and Oceanic Sciences.
■7730 ▼tDissertations Abstracts International▼g87-04B.
■790 ▼a0181
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358348▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


