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Real-time multivariate Madden Julian Oscillation projection coefficients for GEFSv12 Reanalysis and Reforecasts (NCEI Accession 0259491)

Metadata Updated: November 1, 2023

The Real-time multivariate Madden Julian Oscillation (RMM) indices for the Global Ensemble Forecast System version 12 (GEFSv12) reanalysis and reforecast datasets are provided. They were computed using the methodology outlined in Wheeler and Hendon (2004).

For the GEFSv12 reanalysis (Reanalysis RMMs), anomalies of outgoing longwave radiation (OLR), 200 hPa zonal winds (U200), and 850 hPa zonal winds (U850) are provided for January 1, 2000 through March 31, 2020. The mean of the most recent 120 days of anomaly data for that field is subtracted to remove the influence of low frequency variability (e.g., ENSO), and the anomalous fields are latitudinally averaged and each of the latitudinally averaged sets of anomalies is projected onto the GEFSv12 reanalysis EOFs.

For the GEFSv12 reforecasts (Reforecast ensemble mean RMMs), each of the 11 ensemble members for a given reforecast initialization are first averaged together. The MJO indices are then calculated using the adaptations of WH04 methodology applied to forecast datasets detailed by Gottschalck et al. (2010).

For Reforecast individual member RMMs, rather than averaging together the 11 ensemble members for a given reforecast initialization as in the ensemble mean calculations, each member is preserved and from it, the corresponding lead time dependent climatology for the relevant field is removed. This allows for the calculation of anomalies for each member of each reforecast and subsequently calculation of RMMs as described above.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Date 2023-08-30T13:25:28Z
Metadata Created Date March 17, 2023
Metadata Updated Date November 1, 2023
Reference Date(s) October 19, 2022 (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from NOAA/NESDIS/ncei/accessions

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Additional Metadata

Resource Type Model
Metadata Date 2023-08-30T13:25:28Z
Metadata Created Date March 17, 2023
Metadata Updated Date November 1, 2023
Reference Date(s) October 19, 2022 (publication)
Responsible Party (Point of Contact)
Contact Email
Guid gov.noaa.nodc:0259491
Access Constraints Cite as: Elsbury, Dillon; Lawrence, Zachary; Gehne, Maria (2022). Real-time multivariate Madden Julian Oscillation projection coefficients for GEFSv12 Reanalysis and Reforecasts (NCEI Accession 0259491). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/pqq7-3n58. Accessed [date]., Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Bbox East Long 180
Bbox North Lat 15
Bbox South Lat -15
Bbox West Long -180
Coupled Resource
Frequency Of Update asNeeded
Graphic Preview Description Preview graphic
Graphic Preview File https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:0259491
Graphic Preview Type PNG
Harvest Object Id ee54492c-d309-450a-ab8d-2b5a71aa9760
Harvest Source Id c084a438-6f6b-470d-93e0-16aeddb9f513
Harvest Source Title NOAA/NESDIS/ncei/accessions
Licence accessLevel: Public
Lineage
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-180.0, -15.0], [180.0, -15.0], [180.0, 15.0], [-180.0, 15.0], [-180.0, -15.0]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2000-01-01
Temporal Extent End 2020-03-31

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