The 1500 Year Quasiperiodicity During the Holocene - Abrupt Climate Change: Mechanisms, Patterns, and Impacts - page 164

Figure 5. Same as Figure 4 for the near-surface salinity and the salinity at the base of seasonal thermocline.
Figure 6. Millennium empirical mode decomposition modes of temperature and salinity data from Figure 3. The modes
have frequency bands close to 1500 year periodicity. The varying amplitudes of the modes indicate that the 1500 year
periodicity is highly nonlinear.