11th October - Today's News: Warmest September in Satellite Records

Latest figures from UAH show lower tropospheric temperatures to have produced the warmest September in the satellite records - this despite a strong La Nina. As Roger Pielke Sr says:
If this persists while we are in a La Niña pattern (when we expect cooling) it will provide strong support for those who expect a long term warming to occur as a result of the accumulation of greenhouse gases in the Earth’s atmosphere. On the other hand, if the temperatures cool to average or below average over large portions of the globe, this would indicate that the climate has a self regulation which mutes temperature excursions.
Whilst Roy Spencer also comments that

Despite cooling in the tropics, the global average lower tropospheric temperature anomaly has stubbornly refused to follow suit: +0.60 deg. C for September, 2010.

Since the daily global average sea surface temperature anomalies on our NASA Discover web page have now cooled to well below the 2002-2010 average, there remains a rather large discrepancy between these two measures. Without digging into the regional differences in the two datasets, I currently have no explanation for this.

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