Kathy Seibert, Lawrence Livermore National Laboratory
Arctic sea-ice changes drive precipitation decreases over California. Arctic sea-ice loss induces high-latitude changes. These changes trigger tropical circulation and convection responses. Decreased convection and decreased upper level divergence in the tropical Pacific Ocean then drive a northward propagating Rossby wavetrain, with anticyclonic flow forming in the North Pacific Ocean. The result? The flow steers the wet tropical air masses away from California.