Antarctic 20th Century Accumulation Changes Based on Regional Climate Model Simulations

Figure 10

Time series of the yearly mean AAO index, 1958–2001 based on ERA-40 (blue) and NCEP data (black) at 850 hPa. The thin blue and black lines display the annual values and the thick blue and black lines the 5 year running mean. The positive AAO phases are indicated by red and the negative AAO phase by blue columns.