TNI Index

Describes SST across tropical Pacific Ocean.


sample plot
TNI correlated with SST over the tropical Pacific Ocean.
sample plot
link to page that created plot with options selected (optional)
Description
  • 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.
Specifications
Temporal Coverage
  • Monthly values: 1870/01 to present
  • Update Status: Monthly
Data Notes
  • Units: degC
  • Missing data value: -99.0
Get Data
Usage
Usage Restrictions
  • None
Caveats
  • None
Related time-series and links
Related Time-series
Links
Analysis pages that use time-series
Analysis pages
  • WRIT correlation
  • WRIT time-series
Source, References, and Citation
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.