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Showing 1 to 20 of 24 for “"Madden-Julian Oscillation"”.

  1. The Madden-Julian Oscillation and Convective Aggregation

    Davison, MatthewUniversity of Cambridge2024

    The Madden-Julian oscillation (MJO) is a region of enhanced precipitation which forms every 30-60 days over the Indian Ocean and slowly propagates to the east over the Pacific. Despite being the dominant mode of intraseasonal variability in the tropical troposphere, most numerical models struggle …

    cambridge Repository record

  2. The Madden-Julian oscillation and nonlinear moisture modes

    Sugiyama, MasahiroMassachusetts Institute of Technology2008

    The Madden-Julian oscillation (MJO), the dominant tropical intraseasonal variability with widespread meteorological impacts, continues to puzzle the climate research community on both theoretical and modeling fronts. Motivated by a recent interest in the role of humidity in tropical dynamics, this …

    mit Repository record

  3. The dynamical ocean component of the Madden-Julian oscillation

    Webber, BenUniversity of East Anglia2012

    east-anglia Repository record

  4. Radiative feedbacks in tropical organized convection and the Madden-Julian oscillation

    Hsiao, Wei-Ting, author, Maloney, Eric D., advisor, Rugenstein, Maria A. A., committee member, Kummerow, Christian D., committee member, Randall, David A., committee member, Mueller, Nathaniel D., committee memberColorado State University. Libraries2024

    … convection, radiative feedbacks, and the Madden-Julian oscillation (MJO) using a set of observation-derived data products, including retrievals using spaceborne satellites and ground-based precipitation radar, along with combined products and reanalyses. The main findings in each chapter …

    colostate Repository record

  5. On intraseasonal variability in the tropics: tropical cyclones, the Madden-Julian Oscillation, and equatorial waves

    Lin, JonathanMassachusetts Institute of Technology2022

    … by tropical cyclones, equatorial waves, and the Madden-Julian Oscillation (MJO). Because these phenomena have significant societal impacts on sub-seasonal time scales, and it is important to understand how they interact with the large-scale atmosphere. The first part of this thesis develops …

    mit Repository record

  6. The Madden-Julian Oscillation and the diurnal cycle over the Maritime Continent: scale interactions and modelling

    Peatman, SimonUniversity of East Anglia2014

    … is within the convective region of the Madden-Julian Oscillation (MJO), which provides the greatest variability on intra-seasonal time scales: large-scale (�107 km2) active and suppressed convective envelopes propagate slowly (�5 m s-1) eastwards between the Indian and Pacific Oceans. …

    east-anglia Repository record

  7. Comparison of cloud systems simulated with two-dimensional and three-dimensional cloud resolving models

    Covert, Justin2019

    … were used to produce 30-day simulations of the Madden-Julian Oscillation (MJO) during the first month of the Dynamics of the Madden-Julian Oscillation (DYNAMO) field campaign (October 2011) to study the effects of dimensionality to increase understanding of convective cloud processes and the …

    iastate Repository record

  8. Teleconnective Influences on the Strength of Post-tropical Cyclones

    Young, Jeremy

    … how teleconnections such as the El Niño Southern Oscillation (ENSO), the Madden-Julian Oscillation (MJO), the Atlantic Multidecadal Oscillation (AMO) and the Pacific Decadal Oscillation (PDO) contribute to the strength of a transitioning post-tropical storm. T-tests performed show strong …

    wku-diss Repository record

  9. Long-range statistical forecasting of Korean summer precipitation

    Tournay, Robert C.Monterey, California. Naval Postgraduate School2008

    … El NinÌ o / La NinÌ a state. We found that the Madden-Julian Oscillation (MJO), when conditioned with our seasonal index, showed skill in forecasting with lead times out to 20 days. Last, we found that tropical cyclone activity in Korea is impacted by ENSO on the interannual scale, and MJO on …

    nps Repository record

  10. The Effect of Orbital Forcing on the MJO’s Amplitude and Phase Speed

    Rushley, Stephanie2020

    The Madden-Julian Oscillation (MJO) has a pronounced seasonal cycle, drifting from the Southern Hemisphere in boreal winter to the Northern Hemisphere in boreal summer, with a maximum intensity during boreal winter in the Southern Hemisphere. The reason for this maximum intensity during boreal …

    washington Repository record

  11. Role of multiscale atmospheric conditions in the evolution of convective organization during MJO-1 of DYNAMO/CINDY/AMIE

    Thayer, Jeffrey DaleUniversity of Illinois at Urbana-Champaign2018

    … organization during a central Indian Ocean Madden-Julian Oscillation (MJO) event observed by the DYNAMO/CINDY/AMIE field campaigns in October 2011. Shifts in reflectivity and dual-polarization characteristics of four precipitation types over two time periods, at the beginning and end of the …

    uiuc Repository record

  12. Towards using neural networks for geoscientific discovery

    Toms, Benjamin A., author, Barnes, Elizabeth A., advisor, Ebert-Uphoff, Imme, committee member, Hurrell, James W., committee member, Thompson, David W. J., committee memberColorado State University. Libraries2020

    … to a geoscientific dataset. For example, the Madden-Julian Oscillation was discovered through Fourier transforms of tropical time-series, while the defining structures of the Northern Hemispheric annular modes were first captured using principal component analysis. These discoveries rooted in …

    colostate Repository record

  13. Surface heat fluxes and MJO propagation through the Maritime Continent

    Hudson, Justin, author, Maloney, Eric, advisor, Rasmussen, Kristen, committee member, Rugenstein, Jeremy, committee memberColorado State University. Libraries2022

    … hurdle in understanding the propagation of the Madden-Julian Oscillation (MJO). To understand the differing dynamics of MJO events that propagate versus stall over the MC, a new MJO tracking algorithm utilizing 30-96 day filtered NOAA Interpolated OLR anomalies is presented. Using this …

    colostate Repository record

  14. The Study of the Indian Ocean Response to Climatic Events Using Satellite Observations and Model Simulations

    Grunseich, Gary

    … the Indian Ocean Dipole (IOD), El Niño-Southern Oscillation (ENSO), and the Madden-Julian Oscillation (MJO). Simple Ocean Data Assimilation (SODA) reanalysis of Sea Surface Salinity (SSS) from 1871-2008 is used to study the salinity variations during numerous phases of IOD events. The dynamics …

    south-carolina Repository record

  15. Intra-seasonal oscillations of convection over southern Africa

    Levey, Kevin MDepartment of Oceanography1993

    … (OLR) index and P-E index. A longer 40-60 day oscillation or Madden Julian Oscillation (MJO) and a shorter 20-30 day ISO are identified. The interaction between the Rossby waves of the mid-latitudes and the MJO of tropics appears to be the main cause of the 20-30 day ISO operating over southern …

    cape-town Repository record

  16. Satellite derived rainfall over tropical Africa : its pattern variability and calibration

    Tazalika, Lukiya2004

    … cycles between 20-70 days for the intra-seasonal oscillations. The first mode of seasonal rainfall that explains 36% of the total variance is dominated by the annual cycle associated with the ITCZ and is loaded over equatorial Africa. The dominant mode for the zonal wind is loaded over eastern …

    zulu Repository record

  17. Vegetation feedback on the boundary layer climate of South Africa

    Chikoore, Hector2005

    … at approximately 40 and 20 days. The 40-day oscillation reflects the Madden-Julian Oscillation and is partially phase-locked to the seasonal cycle. The spatial loadings are focused on a region along the eastern edge of the Kalahari (± 23°E), extending from the western Zambezi toward central …

    zulu Repository record

  18. The effect of large-scale interannual variations in the Gulf of Guinea

    Muhammed, IbrahimUniversity of Southampton2011

    … of 18N, zonal tropospheric winds associated with Madden-Julian Oscillation appear to alter the changes on surface winds. This connection between surface and atmospheric winds explains the inability of the winds to covary interannually with SST at the TIWs frontal zones. Investigations presented in …

    soton Repository record

  19. Characterisations of Different El Nino Types, their Physical Causes and Predictions

    Lai, Wang ChunUniversity of Cambridge2018

    El Niño Southern Oscillation (ENSO) is the most important interannual mode of climate variability in the tropical Pacific affecting the globe through teleconnections. The evolution of ENSO is studied with focus on individual El Nino (EN) events; factors and processes explaining the behaviours of …

    cambridge Repository record

  20. Toward better subseasonal-to-seasonal prediction: physics-oriented model evaluation and predictability of tropical cyclones

    Li, WeiweiUniversity of Illinois at Urbana-Champaign2017

    … and improvement. My thesis first evaluated the Madden-Julian oscillation (MJO) - the dominant mode of tropical subseasonal variability and an important source of predictability on S2S timescales. Both the Navy Operational Global Atmospheric Prediction System (NOGAPS) and Global Forecasting …

    uiuc Repository record

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