Does 'Climate Change' Mean 'Changing Data'?

From the story: NASA temperature figures show [the] agency reworking recent numbers upwards, older numbers downwards.

John Goetz, writing last month in the science blog Climate Audit, analyzed the way NASA's Goddard Institute for Space Studies calculates estimated global surface temperatures and showed that the addition of new, contemporary data could "have a ripple effect all the way back to the beginning of a [weather] station's history."

Goetz found 32 different versions of published global annual averages going back to Sept. 24, 2005, that showed the published figures – figures used as a baseline to demonstrate change through time – changing hundreds of times.

"On average 20% of the historical record was modified 16 times in the last 2 1/2 years," he wrote. "The largest single jump was 0.27 °C. This occurred between the Oct. 13, 2006 and Jan. 15, 2007 records when Aug 2006 changed from an anomaly of +0.43 °C to +0.70 °C, a change of nearly 68 percent." Read more...