You are here

Home » Climate Data

Climate Data

MJO: Madden-Julian Oscillation Diagnostics

"The Madden–Julian oscillation (MJO) is the largest element of the intraseasonal (30–90 days) variability in the tropical atmosphere. It is a large-scale coupling between atmospheric circulation and tropical deep convection.[1][2] Rather than being a standing pattern (like ENSO) it is a traveling pattern, propagating eastwards at approximately 4 to 8 m/s, through the atmosphere above the warm parts of the Indian and Pacific oceans. This overall circulation pattern manifests itself in various ways, most clearly as anomalous rainfall." (Wikipedia) The US-CLIVAR MJO working group has developed diagnostics for objectively evaluating the MJO. Two WWW sites demonstrate the diagnostics: http://www.ncl.ucar.edu/Applications/mjoclivar.shtml and http://climate.snu.ac.kr/mjo_diagnostics/index.htm. Operational centers monitor the MJO and indicies are available at: http://cawcr.gov.au/staff/mwheeler/maproom/RMM/ and http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_mjo_index/mjo_...

Technical Notes

The US-CLIVAR MJO working group has developed diagnostics for objectively evaluating the MJO. Two WWW site demonstrate the diagnostics: http://www.ncl.ucar.edu/Applications/mjoclivar.shtml and http://climate.snu.ac.kr/mjo_diagnostics/index.htm

Key Figures

Click the thumbnails to view larger sizes

Thumbnails

Captions
Hovmuller diagram (time vs longitude) for an active MJO two-year period (1996-1997). (Climate Data Guide; D. Shea)
MJO phase diagram for period 10/16/1996 to 4/15/1997. (Climate Data Guide; D. Shea)
Composite life cycle of 20-100 day band passed filtered anomaly OLR, U850, V850 for the years 1995-1999. The phase (eg P3, means "Phase 3") and the number of days used to create the composite are at the lower right. (Climate Data Guide; D. Shea)
Climatological cross correlations spanning the period Oct 1996 - Dec 2005 using 20-100 band pass filtered data. The reference time series is the central Indian Ocean regional precipitation time series. This is correlated with precipitation and zonal wind anomalies. (Climate Data Guide; D. Shea)

Cite this page

National Center for Atmospheric Research Staff (Eds). Last modified 08 Oct 2013. "The Climate Data Guide: MJO: Madden-Julian Oscillation Diagnostics." Retrieved from https://climatedataguide.ucar.edu/climate-data/mjo-madden-julian-oscillation-diagnostics.

Acknowledgement of any material taken from this page is appreciated. On behalf of experts who have contributed data, advice, and/or figures, please cite their work as well.

MJO: Madden-Julian Oscillation Diagnostics

"The Madden–Julian oscillation (MJO) is the largest element of the intraseasonal (30–90 days) variability in the tropical atmosphere. It is a large-scale coupling between atmospheric circulation and tropical deep convection.[1][2] Rather than being a standing pattern (like ENSO) it is a traveling pattern, propagating eastwards at approximately 4 to 8 m/s, through the atmosphere above the warm parts of the Indian and Pacific oceans. This overall circulation pattern manifests itself in various ways, most clearly as anomalous rainfall." (Wikipedia) The US-CLIVAR MJO working group has developed diagnostics for objectively evaluating the MJO. Two WWW sites demonstrate the diagnostics: http://www.ncl.ucar.edu/Applications/mjoclivar.shtml and http://climate.snu.ac.kr/mjo_diagnostics/index.htm. Operational centers monitor the MJO and indicies are available at: http://cawcr.gov.au/staff/mwheeler/maproom/RMM/ and http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_mjo_index/mjo_...

Copyright 2021 UCAR | Contact | Privacy Policy | Terms of Use | Copyright Issues | NCAR Home

The National Center for Atmospheric Research is sponsored by the National Science Foundation. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation.