Southern Oscillation Index (SOI)

• The SOI is defined as the normalized pressure difference between Tahiti and Darwin. There are several slight variations in the SOI values calculated at various centres. Here we supply the SOI (from CRU) which is based on the method given by Ropelewski and Jones (1987).

Time-series List

• SOI: Standard PSL Format: Standard PSL Format, CSV, NetCDF (What is standard format?)

Usage Restrictions

• None

Caveats

• None

Related Time-series

Links

Analysis pages

• WRIT correlations
• WRIT time-series

Original Source

• Data is from CRU via the page https://crudata.uea.ac.uk/cru/data/soi/.
  

Time-series source dataset(s)

• Input data for the mode calculation is station data.

References

• Allan, R.J., Nicholls, N., Jones, P.D. and Butterworth, I.J., 1991: A further extension of the Tahiti-Darwin SOI, early SOI results and Darwin pressure. J. Climate, 4, 743-749.
• Ko"nnen, G.P., Jones, P.D., Kaltofen, M.H. and Allan, R.J., 1998: Pre-1866 extensions of the Southern Oscillation Index using early Indonesian and Tahitian meteorological readings. J. Climate, 11, 2325-2339.
• Ropelewski, C.F. and Jones, P.D., 1987: An extension of the Tahiti-Darwin Southern Oscillation Index. Monthly Weather Review, 115, 2161-2165.