Reasons for a fresher northern North Atlantic in the late 20th century

Physics

Scientific paper

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Global Change: Climate Dynamics (0429, 3309), Global Change: Oceans (1616, 3305, 4215, 4513), Oceanography: Physical: General Circulation (1218, 1222)

Scientific paper

Observational analyses suggest that the northern North Atlantic is fresher in the late 20th century in comparison to the 1950-60s. Here we examine possible contributors to these observed changes by analyzing a four-member ensemble of 20th century simulations from a coupled climate model. Results show that a weaker meridional freshwater divergence related to a weaker thermohaline circulation in the North Atlantic is the primary cause for the freshening in the northern North Atlantic in the model. The increased P-E tends to enforce it, but the reduced sea ice flux into this region tends to weaken it.

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