Unprecedented solar levels and long period of quiet solar may enhance the global cooling effect as La Nina comes on. Note the rapid global temperature (MSU satellite lower atmospheric temperatures shown) declines in prior La Nina episodes post strong El Ninos (red arrows).
Note similarity of sunspot activity to cycle 5 at the start of the Dalton Minimum. Cycle 14 a century ago is also shown and has been regarded by some as another possible analog/ Note the more rapid recovery that cycle. That was also a cold period though not as cold as the Dalton.
Click source to read PDF download from Joseph D’Aleo at IceCap.US