Figure 1

Time series of DJF-mean amplitude from WH, JRA, and OT. For the period 1979–2014 r(OT,JRA) = 0.85, r(OT,WH) = 0.86, and r(WH,JRA) = 0.95. For the period 1959–1978, r(OT,JRA) = 0.76.

Time series of DJF-mean amplitude from WH, JRA, and OT. For the period 1979–2014 r(OT,JRA) = 0.85, r(OT,WH) = 0.86, and r(WH,JRA) = 0.95. For the period 1959–1978, r(OT,JRA) = 0.76.