Darwin SOI and GISST Time Series

 


Upper Panel: Darwin Southern Oscillation Index (SOI) represented as monthly surface pressure anomalies in millibars. Data spans January 1882 to December 1998. Base period climatology computed from the period January 1882 to December 1981.

Lower Panel: Niño 3.4 Region (120°W-170°W, 5°S-5°N) monthly SST anomalies in °C derived from the U.K. Meteorological Office Global Ice and Sea Surface Temperature (GISST) data set. Data spans January 1871 to December 1997. Base period climatology computed from the period January 1950 to December 1979.