Monday, April 6, 2015

No global warming since December 1996

Warming, warming, who has the warming?
Since December 1996 there has been no global warming at all (Fig. 1). This month’s RSS temperature – so far unaffected by the most persistent el Niño conditions of the present rather attenuated cycle – shows a new record length for the ever-Greater Pause: 18 years 4 months – and counting.

This result rather surprises me. I’d expected even a weak el Niño to have more effect that this, but it is always possible that the temperature increase that usually accompanies an el Niño will come through after a lag of four or five months. On the other hand, Roy Spencer, at his always-to-the-point blog (, says: “We are probably past the point of reaching a new peak temperature anomaly from the current El Niño, suggesting it was rather weak.” I shall defer to the expert, with pleasure. For if la Niña conditions begin to cool the oceans in time, there could be quite some lengthening of the Pause just in time for the Paris world-government summit in December.

Figure 1. The least-squares linear-regression trend on the RSS satellite monthly global mean surface temperature anomaly dataset shows no global warming for 18 years 4 months since December 1996.
You can see the 1998 "super" El Niño event. It was a one-off anomaly (otherwise it would be appropriate to say that there's been a half degree temperature decrease since 1998).  But remember, it's a crisis.

1 comment:

kx59 said...

We should lobby congress to arrest the global cooling deniers.