TNI Index
Describes SST across tropical Pacific Ocean.
TNI correlated with SST over the tropical Pacific Ocean.
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- The timeseries is calculated from the HadISST and the NCEP OI SST Datasets. It is the standardized Nino 12 minus the Niño 4 with a 5 month running mean applied which is then standardized using the 1950-1979 period. There is now a version that just uses the HadISST. This avoids the issue where the OI SST doesn't match the HadISST.
Temporal Coverage
- Monthly values: 1870/01 to present
- Update Status: Monthly
Data Notes
- Units: degC
- Missing data value: -99.0
Time-series List
Usage Restrictions
- None
Caveats
- None
Related Time-series
Links
Analysis pages
- WRIT correlation
- WRIT time-series
Original Source
- Data is from NOAA PSL using the HadISST dataset. Index was originally developed by Kevin Trenberth of NCAR/CGD. PSL is updating the index each month. This version is based on the latest HADISST and NCEP OI datasets.
Time-series source dataset(s)
- Input data for the mode calculation is the HadISST1.1 and the NOAA OI
References
- Kevin E. Trenberth and David P. Stepaniak: J. Climate, 14, 1697-1701.