| There has been a progressive deepening of winter convection in the Labrador Sea from 2012 to 2016. The relative roles of atmospheric and oceanic processes in driving such variability remain unclear. A global eddy-permitting ocean-sea ice model, which has a good performance in the Labrador Sea deep convection simulation, is used to investigated this progressive deepening. Changes in air conditions and the sea ice melting induced freshwater flux variability contribute to the deep convection significantly. In addition, the relative roles of the preconditioning and the atmospheric forcing are diagnosed, found that the preconditioning is the dominant role in initiating the deep convection. |
