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Temperature changes recorded in the 1,500 to 2,500 meter layer near Bermuda. The top plots show time series of Bermuda temperature anomaly (red curve) lagged by 6 years, thickness of the Labrador Sea Water layer (blue curve) in its formation area, and temperature of the LSW core (green curve). The lower plot shows a lagged correlation analysis for Bermuda temperature and Labrador Sea Water (LSW) thickness, which is highest for lags of 5 to 7 years. The authors? interpretation is that subpolar thickness anomalies result in variability of the volume of LSW entering the subtropics. A large volume of LSW shifts the balance of influence between LSW and Mediterranean Outflow towards LSW. When the LSW is thick, Bermuda sees colder (and fresher) conditions about 6 years later, while a thin LSW source results in stronger Mediterranean Outflow influence and Bermuda sees warmer (and saltier) conditions after about 6 years.[back]
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