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Dipole Mode Index (DMI)

Intensity of the IOD is represented by anomalous SST gradient between the western equatorial Indian Ocean (50E-70E and 10S-10N) and the south eastern equatorial Indian Ocean (90E-110E and 10S-0N). This gradient is named as Dipole Mode Index (DMI). When the DMI is positive then, the phenomenon is refereed as the positive IOD and when it is negative, it is refereed as negative IOD.

Time Interval: Monthly
Time Coverage: 1870 to 2017
Update Status: Periodically updated

Get Data:

DMI: Standard PSD Format (What is standard format?)
DMI: Standard PSD Format from March 2017 (What is standard format?)

Source:
Data is from JAMSTEC via the page http://www.jamstec.go.jp/frcgc/research/d1/iod/e/iod/about_iod.html.
References:

  1. Possible impacts of Indian Ocean Dipole mode events on global climate. Authors: Saji, NH;Yamagata, T, CLIMATE RES, 25 (2): 151-169 DEC 5 2003.

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Document maintained by Cathy Smith (cathy.smith@noaa.gov)
Updated: Sep 12, 2017 09:07:11 MDT
http://www.esrl.noaa.gov/psd/gcos_wgsp/Timeseries/DMI/index.html
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