Figure 5: Coralline algal Ba/Ca compared to observational and proxy data. | Nature Communications

Figure 5: Coralline algal Ba/Ca compared to observational and proxy data.

From: Multicentennial record of Labrador Sea primary productivity and sea-ice variability archived in coralline algal barium

Figure 5

Coloured lines represent 10-year means. (a) Coralline algal Ba/Ca was correlated to: (b) Coralline algal δ13C; (c) Fram Strait sea-ice export46; (d) Sea-ice proxy41; (e) Instrumental AMO index52; and (f) Tree-ring based proxy AMO index53. The algal δ13C time series in (b) was only plotted until 1960 (asterisk) due to overprinting by anthropogenic input of isotopically light carbon post 1960 (see main text for details). The full annually resolved δ13C time series is shown in Fig. 2a. Light grey bars indicate periods of higher Ba/Ca associated with increased sea-ice and cool phases of the Atlantic Multidecadal Oscillation. Note that (d) proxy sea-ice data, (e) instrumental AMO index, and (f) proxy AMO Index are plotted inversely to show increasing sea-ice and cooling.

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