AAO Index (SV SAM index)

24 November, 2023
Yoshihiro Tachibana (Mie University)

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• Graphics of daily time series of AAO index (SV SAM index) (click here)

• Text file of the daily time series of AAO index (SV SAM index) (NCEP1) (JRA3Q)
• Text file of the monthly time series of AAO index (SV SAM index) (NCEP1) (JRA3Q) (ERA5)

The definition of AAO index (SV SAM index)

1) EOF was applied to a temporal covariance matrix of geopotential height fields for individual calendar months using a zonally averaged monthly geopotential height field from 1000 to 200 hPa for the area poleward of 40S.
2) The daily time series of the AAO index (SV SAM index) is obtained by projecting daily zonal mean geopotential height anomalies onto the EOF of each month.

Notice and background of AAO index (SV SAM index)

References

Tachibana, Y., Y. Inoue, K. K. Komatsu, T. Nakamura, M. Honda, K. Ogata, and K. Yamazaki, (2018) Interhemispheric synchronization between the AO and the AAO. Geophysical Research Letters, 45, 13477-13484. doi: 10.1029/2018GL081002. (Link)

Thompson, D. W. J. and S. Solomon (2002) Interpretation of Recent Southern Hemisphere Climate Change. Science, 296, 895-899. doi: 10.1126/science.1069270. (Link)