Fig. 4: Comparison of alkenone-based sea surface temperature (SST) on the Iberian Margin.

a Site IODP U1385. b Site MD01-2444. Red lines are SST reconstructed by \({U}_{37}^{{K{{\hbox{'}}}}}\) with Bayesian calibration54. Green lines are SST reconstructed by \({U}_{37}^{K}\) by Rosell‐Melé27. Blue lines are SST reconstructed by \({U}_{38{Me}}^{{K{{\hbox{'}}}}}\) by Novak et al.55. The shaded areas are percentage of tetra-unsaturated alkenones (C37:4%). Source data of this figure are provided as a Source data file.