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Equatorial SOI Data: The standardized anomaly of the difference between the area-average monthly sea level pressure (from the NCEP/NCAR Reanalysis) in an area of the eastern Pacific (80°W - 130°W, 5°N - 5°S) and an area over Indonesia (90°E - 140°E, 5°N - 5°S). The base period used for computing the anomalies is 1979-1995. SOI Data: The difference between the standardized Tahiti monthly average sea level pressure and standardized Darwin monthly average sea level pressure. Equatorial Sea Level Pressure Data: NCEP/NCAR Reanalysis monthly sea level pressure data on 2.5° latitude x 2.5° longitude grid Data Period for Equatorial SOI: Jan 1948 - present Data Period for SOI: Jan 1949 - present Data Source: NCEP, Climate Prediction Center (CPC) Description:
Top: Three-month running average of the Equatorial SOI (in red) and the three-month running average of the SOI (in blue) for the past five years.
NCEP is
an acronym for the US National Centers for Environmental Prediction. |