What is the Indian Ocean Dipole? The Indian Ocean Dipole is a climate pattern affecting the Indian Ocean. During a positive phase, warm waters are pushed to the Western part of the Indian Ocean, while cold deep waters are brought up to the surface in the Eastern Indian Ocean. This pattern is reversed during the negative phase of the IOD.

The plot tracks the conditions in the Indian Ocean, showing the phase of the IOD both now and in the past. When the value of the time series is positive (red shading), the warm phase of the IOD is present with higher sea level in the western Indian Ocean …

IOD index (or Dipole Mode Index, DMI) is used to identify IOD phases, by taking the difference between the west and east regions in the Indian Ocean. A positive IOD period is characterised by cooler than average water in the tropical eastern Indian Ocean and warmer than average water in the tropical western Indian Ocean.

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).

Because of the high frequency filter applied to the ERSSTv5 data (Huang et al. 2017, J.Climate), Dipole Mode Index (DMI) values may change up to two months after the initial "real time" value is posted. Therefore, the most recent DMI values should be considered an estimate.

The time-series webpages associaed with the GCOS Surfac Pressure are being taken down. They are being replaced with in the location PSL Monthly Time-series.

3 天之前 · The Indian Ocean Dipole (IOD) is defined by the difference in sea surface temperatures between the eastern and western tropical Indian Ocean. The influence of the IOD varies in conjunction with other climate indicators such as the El Niño–Southern Oscillation (ENSO).

Time series of DMI Figure 3 shows DMI time series. IOD occurrence frequency varies significantly over time, with greater frequency in the positive phase since 2000. The DMI is derived from datasets of MGDSST (Kurihara et al. 2006) after June 2015 and those of COBE-SST2 (Hirahara et al. 2014) before May 2015.

2021年9月2日 · The IOD is defined by the Dipole Mode Index (DMI), which is a measure of the anomalous sea surface temperature (SST) gradient between the western equatorial Indian Ocean (50E-70E and 10S-10N) and the southeastern equatorial Indian Ocean (90E-110E and 10S-0N).

Optional sortable table view, after selecting this view, select a climate index and data period. The table is displayed before the graph.