Climate Timeseries

TPI (IPO) Tripole Index for the Interdecadal Pacific Oscillation

The NOAA ERSST V3b index now uses NOAA ERSST V4

Description:
The index is based on the difference between the SSTA averaged over the central equatorial Pacific and the average of the SSTA in the Northwest and Southwest Pacific. It is a measure of interdecadal variability in the Pacific. The map to the right shows the correlations of the low-pass index TPI with filtered HadISST2.1(composite of 10 realisations). Other versions have been calculated from these SST datasets: NOAA ERSST V4 and the HadISST.
Time Interval: Monthly
Time Coverage: 1870 to 2010 (HadISST2.1)
Time Coverage: 1870 to near present (HadISST1, NOAA ERSST V4)
Update Status: irregular
Get Data:
TPI (from NOAA ERSST V4) unfiltered: Standard PSD Format (What is standard format?)
TPI (from NOAA ERSST V4) filtered: Standard PSD Format (What is standard format?)
TPI (from HadISST2.1) unfiltered, composite of 10 realizations: Standard PSD Format (What is standard format?)
TPI (from HadISST2.1) filtered, composite of 10 realizations: Standard PSD Format (What is standard format?)
TPI (from HadISST) unfiltered: Standard PSD Format (What is standard format?)
TPI (from HadISST) filtered: Standard PSD Format (What is standard format?)
Source: Method:
The index is based on the difference between the SSTA averaged over the central equatorial Pacific and the average of the SSTA in the Northwest and Southwest Pacific. Different SST datasets have been used to calculate the index (HadISST2.1, HadISST, NOAA ERSST V4). The regions used to calculate the index shown in the map above and are:
Region 1: 25°N–45°N, 140°E–145°W
Region 2: 10°S–10°N, 170°E–90°W
Region 3: 50°S–15°S, 150°E–160°W
The climatology time period is now Jan 1971 to Jan 2000.The filtering is now applied before truncating to 1870.
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