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Climate Prediction Center (CPC) Madden-Julian Oscillation (MJO) Index

Summary

Type of release
ongoing release of a series of related datasets

Data Licence
Not Applicable

Content Licence
Creative Commons CCZero

Verification
automatically awarded

Release Date
27 September 2015
Modified Date
27 September 2015
Update Frequency
monthly
Publishers
National Oceanic and Atmospheric Administration, Department of Commerce
Identifier
climate-prediction-center-cpc-madden-julian-oscillation-mjo-index
Landing Page
http://catalog.data.gov/dataset/climate-prediction-center-cpc-madden-julian-oscillation-mjo-index
Temporal Coverage
3 January 1978 — 25 August 2014

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Description

The Climate Prediction Center (CPC) Madden Julian Oscillation index (MJO) is a dataset that allows evaluation of the strength and phase of the MJO during the dataset period. The index is based on pentad 200-hPa velocity potential data equator ward of 30?N during El Ni?o/Southern Oscillation (ENSO) neutral and weak ENSO winters (November-April) in 1979-2000. An extended Empirical Orthogonal Function (EEOF) analysis is used to identify ten time-lagged patterns. Ten MJO indices are determined by projecting the pentad 200-hPa velocity potential anomalies onto the ten time-lagged patterns of the first EEOF of pentad 200-hPa velocity potential anomalies. Anomalies are based on the 1979-1995 period, and each index is normalized by its standard deviation during ENSO-neutral and weak ENSO winters (November-April) in 1979-2000.

General Information

Legal Information

This dataset has been created by US Government which means it is required to be in the public domain. However US copyright law only allows open access by US citizens, we have assumed the data is equivalently licensed as CC0 for the rest of the world as this is in the spirit of the US Government’s Open Data policy.

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  • Find out how to contact someone about this data at

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