Same data with four year low pass filter applied, as described here:

https://climategrog.wordpress.com/?attachment_id=233

Here the decadal scale variations show CO2 acceleration lagging rate of change of temperature .

The lag is larger at the beginning and end of the record.

The lag is larger at the beginning and end of the record. Varying between about 0.5 years around 1990-95 to >1.5 years at the end.

Toughs of dT/dt seem constant, variation is in amplitude.

d/dt icoads: SD = 0.00850688

d2/dt2 CO2: SD = 0.0651294

ratio 7.65 ppm/year per kelvin