Southern Oscillation Index (SOI)

Correlation January SOI index with 20CRV3 sea level pressure

WRIT TS

Description and Specifications

Description

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).

Temporal Coverage

Monthly values: 1866/01 to Aug 2021
Update Status: Irregular

Data Notes

Units: standardized

Get Data

Time-series List

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

Source, citation and related Information.

Related Time-series

20CR SOI

Links

psl enso

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 this time-series is station data.

Citation

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.