본문

서브메뉴

Theory and Idealized Modeling of the Madden-Julian Oscillation
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
저자명  
MacDonald, Cameron George.
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  
Numerical modeling work
키워드  
Convectively-coupled equatorial waves
키워드  
Rossby modes
키워드  
Madden-Julian Oscillation
키워드  
Asymptotic methods
기타저자  
Princeton University Atmospheric and Oceanic Sciences
기본자료저록  
Dissertations Abstracts International. 87-04B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

 008260126s2025        us                              c    eng  d
■001000017358348
■00520260202104648
■006m          o    d                
■007cr#unu||||||||
■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.

미리보기

내보내기

chatGPT토론

Ai 추천 관련 도서


    신착도서 더보기
    최근 3년간 통계입니다.

    소장정보

    • 예약
    • 소재불명신고
    • 나의폴더
    • 우선정리요청
    • 비도서대출신청
    • 야간 도서대출신청
    소장자료
    등록번호 청구기호 소장처 대출가능여부 대출정보
    TF15227 전자도서 대출가능 마이폴더 부재도서신고 비도서대출신청 야간 도서대출신청

    * 대출중인 자료에 한하여 예약이 가능합니다. 예약을 원하시면 예약버튼을 클릭하십시오.

    해당 도서를 다른 이용자가 함께 대출한 도서

    관련 인기도서

    로그인 후 이용 가능합니다.