Figure 5: Phase relationship between key variables of the last millennium IPSL-CM5A-LR simulation.
From: Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions
Cross-correlation coefficients (y-axis) computed over the whole length of the last millennium simulation (850–1850) for different time lags (x-axis), (a) mixed layer depth in the Nordic Seas (an indicator of convection) and nutrient concentration north of Iceland, averaged between 50 and 150 m, where the bivalves are located. (b) Cross-correlation between mixed layer depth in the Nordic Seas and 48°N AMOC. (c) Same as b except that mixed layer depth in the Nordic Seas is replaced by 48°N AMOC. In a,c, different colours are used to represent different nutrients (red, NO3; green, PO4; blue, Si and black, Fe). Correlation coefficients which are significant using a 95% confidence level Student t-test (where degrees of freedom account for data autocorrelation70) are highlighted with circles.
