Fig. 4: Timing of on-shelf CDW maxima and correlation with zonal wind velocity.
From: Seasonal regimes of warm Circumpolar Deep Water intrusion toward Antarctic ice shelves
Panel a shows the month in which the local bottom CDW fraction maximum (Fig. 3a) occurs, and Panel b shows the correlation between the bottom time-series of monthly-mean CDW fraction and the monthly-mean time-series of 10-m ERA-5 zonal wind velocity from the nearest surface grid point. Both panels are masked by the seasonal variance from Fig. 3b, only showing shelves in which the normalised variance exceeds 0.27. Stippling shows regions in which the r-value is significant at the 90% level, assuming 10 degrees of freedom. r-Values are significant at the 99% level in some parts of the shelf between 30- 60°E, in the western Amundsen Sea and also in Vincennes Bay to the west of the Browning Peninsula. These areas are also significant at the 90% level when reducing the degrees of freedom to between 4 and 8 (see Fig. S4). At the 95% level, the significance in this area expands to include the Totten Glacier (100–120°E), which is also significant at the 90% level assuming 8 degrees of freedom (see Fig. S4).
