MJO

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Theme Leaders : Eric Maloney, Duane Waliser

The Madden-Julian Oscillation (MJO) is a critical mode of atmospheric variability at intra-seasonal timescales
(nominally 30-90 days). Through generating planetary waves (i.e., Rossby waves) the MJO exerts a strong
influence on extra-tropical weather. It is increasingly recognized as influencing high-impact weather events in
northern mid-latitudes, especially in wintertime. The MJO adversely affects weather in the tropics by breaking
the precipitation regime of the Asian-Australian-African monsoon system that is vital to the agriculture of the
region. The MJO has even been linked to the onset of El Nino, which has a remarkable world-wide impact on
weather and interannual climate variability. Yet, adequate knowledge of the processes contributing to the initiation and
maintenance of the MJO and realistic simulations and predictions of the MJO remain major scientific
challenges for the weather/climate community.

Against this backdrop, the strategic objectives of the MJO Focus Theme are:

to understand the role of multi-scale convective organization on the MJO;
to evaluate high-resolution multi-scale numerical simulations with emphasis on integrated satellite data and
new reanalysis products;
to take analysis of Multiscale Modeling Framework (MMF) and Global Cloud-system Resolving Models (GCRM)
to the next level of complexity (e.g., multi-scale organization, vertical structure, distribution of cloud types,
transport properties, etc);
to improve the representation of the MJO in climate models and global numerical weather prediction models.

Reports & Presentations

January 2011 Team Meeting
- New insights on the Madden-Julian Oscillation from Models, and a preview of the upcoming DYNAMO field campaign, Eric Maloney
- Modeling the West African Monsoon, Rachel McCrary
- Moisture Sensitivity arameters and the MJO, Walter Hannah
- A Systematic Relationship between Intraseasonal Variability and Mean State Bias in AGCM Simulations, Eric Maloney
- Representation of the Intraseasonal Variability over the Eastern Pacific ITCZ in Climate Models, Xianan Jiang
- Equatorial waves, Charlotte DeMott
- YOTC MJO Task Force, Eric Maloney
- MJO Diabatic Heating Model Inter-Comparison, Duane Waliser
August 2010 Team Meeting
January 2010 Team Meeting
- Effects of a Slab Ocean Model on MJO Structure in the SPCAM, Jim Benedict (17MB)
- The Asian Monsoon in SpCCSM with comparisons to CCSM and SpCAM, Charlotte DeMott and Cristiana Stan (9MB)
- The MJO Simulation in the NCAR CAM3 with Conventional Convective Parameterization: Closure/Trigger, Shallow Convection, and Sensitivity Tests, Guang Zhang (14MB)
- Role of CRM on MJO simulation of SPCAM SOM, Duane Waliser (3MB)
July 2009 Team Meeting
- Introduction, (1MB)
- Gabriel Williams: Modeling of diabatically-forced tropical circulations relevant to the MJO, (< 1MB)
- Partha Mukhopadhyay: The MMF's MJO: Examining CRM Behavior for Clues to better Parameterization, (1MB)
- Bo-Wen Shen: Hierarchical Multiscale Interaction during Tropical Cyclone Formation associated with an MJO or AEW, (9MB)
- Marat Khairoutdinov: MJO sensitivities on aquaplanet as simulated by SP-CAM, (3MB)
- Mitch Moncrieff: Summary of YOTC Implementation Workshop, (< 1MB)
- Jim Benedict: Effects of Idealized Ocean-Atmosphere Coupling on MJO Structure in the Superparameterized CAM, (2MB)
- Breakout Report (1MB)
January 2009 Team Meeting
- M Moncrieff & M Khairoutdinov, MJO Theme (7MB)
- D Waliser, US CLIVAR MJO Working Group: Efforts to Establish and Improve Subseasonal Predictions (4MB)
- E Maloney, Update on MJO modeling activities with CAM3/RAS (3MB)
- E Tromeur, Variation of Energy Transfer to the Atmosphere associated with the MJO (6MB)
- A Sobel, Dynamics of tropical intraseasonal variability: the role of fluxes (3MB)
- H Miura, Progress in the development of a zonal channel version of the vector vorticity model (3MB)
- A Majda, Non-linear models for convective momentum transport in the MJO and new algorithms for superparameterization models on mesoscales (6MB)
- A Vintzileos, Importance of Atmospheric and Oceanic Initial conditions in forecasting the MJO with the NCEP-CFS (6MB)
- Breakout Report (1MB)
July 2008 Team Meeting
- J Benedict, Spatial and temporal structures of the SPCAM's composite MJO lifecycle (4MB)
- B Rossow, Testing the realism of the MMF (or any GCM) representation of the MJO (5MB)
- D Waliser, M Moncrieff, Year of Tropical Convection: Coordinating observing, modeling and forecasting to addressing the challenge of organized tropical convection (8MB)
- BW Shen, A study on the comparison of Goddard MMF and SPCAM results with satellite data (28MB)
January 2008 Team Meeting
- Breakout Report
- T Ackerman, Evaluating the MMF using CloudSAT (and MISR) (2MB)
- Y Zhang, Evaluate MMF deep convection using satellite data
- K Thayer-Calder, Moisture budgets and the MJO in the CAM and SP-CAM (14MB)
- D Waliser, US CLIVAR MJO working group: Efforts to improve subseasonal simulations & establish preditions (18MB)
- T Eidhammer, Importance of aerosols in the initiaion of ice in clouds (4MB)
August 2007 Team Meeting
- Benedict, Thayer-Calder presentation, What the heck is an MJO? (9MB)
- Khairoutdinov presentation, Prototype MMF: Recent Results (11MB)
- Khairoutdinov, Moncrieff report, MJO Focus Theme (1MB)
- Miura, Satoh presentation, Progress of NICAM Activities & GCRM Simulations of MJO (8MB)
- Thayer-Calder breakout presentation, The MJO and Tropical Convection in the CAM and the SP-CAM:
  A Few More Details (6MB)
February 2007 Team Meeting
- Marat Khairoutdinov presentation, MJO in CSU MMF (6MB)
- Marat Khairoutdinov Aug '06 working group summary, Action items for the next 6 months (2MB)
- Mitch Moncrieff theme breakout white paper, CMMAP MJO Focus Theme (Draft) (2MB)
- Duane Waliser presentation, From Cloud Ice to the MJO: Studies and Plans for AddressingTropical Convection Challenges (52MB)

Other meeting presentations found here.

MJO Email Archive

Eric Maloney MJO breakout at CMMAP meeting, 1-6-11
Eric Maloney MJO breakout agenda, 7-23-09
Eric Maloney MJO session at upcoming CMMAP meeting, 6-22-09
Mitch Moncrieff [Fwd: 89th Annual Meeting Abstract Deadline Extended!], 8-6-08
Mitch Moncrieff MJO Breakout Session, 7-28-08
Mitch Moncrieff Talks at MJO breakout?, 7-14-08
Mitch Moncrieff, YOTC Sessions @ AGU 2008 & AMS 2009 --- PLEASE CIRCULATE, 7-11-08
Chin-Hoh Moeng, a large-domain LES of tropical deep convection, 2-11-08
Marat Khairoutdinov, Re: agenda MJO breakout, 1-15-08
Marat Khairoutdinov, MJO breakout, 1102-08
Mitch Moncrieff, MJO Breakout Session (CMMAP), 1-2-08
Mitch Moncrieff, CLIVAR summit presentation, 8-6-07
Marat Khairtoutdinov, MJO break-out agenda (updated), 8-6-07
Marat Khairtoutdinov, MJO break-out agenda, 8-3-07
Marat Khairtoutdinov, MJO break-out session, 7-31-07
Kelley Wittmeyer, MJO Blog, 3-8-07
Mitch Moncrieff, Completed MJO Focus Theme White Paper, 2-27-07
Mitch Moncrieff, MJO Focus Team, 2-12-07

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