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Location: St. Louis, Missouri, United States

Tuesday, January 10, 2012

Beware the Ice of March

Timothy Birdnow

Here are a few good articles.

First, sea ice extent is almost back to 2005 levels.

Second, Patrick Michaels shows why Antarctica is NOT warming as the Gang Green (and Steig et. Al) claim.

From the article:

"Despite Real Climate’s predictable take on the situation, many long-time students of Antarctic climate change (including usn’s here at WCR) yawned. It has been known for decades that there is a net warming in Antarctic surface temperature that began during the International Geophysical Year in 1957. However, what is also well known, is that the vast majority of the observed warming in Antarctica took place from the late 1950s through the early 1970s and that since then—during a period going on 40 years now—there has been very little net temperature change over Antarctica taken as a whole.

What the Steig et al. analysis did do, was to alter the generally accepted spatial pattern of the temperature change across Antarctica. Whereas previous studies showed that the warming was largely limited to the Antarctic peninsula region of West Antarctica with vast areas of cooling occurring distributed across the other parts of the continent, the Steig et al. analysis effectively spread the warming across the entire continent, both during the complete period of record since 1957, as well as during the most recent two-to-three decades (Figure 2).

Almost immediately, speculation popped up across the blogosphere that something was seriously amiss with Steig’s methodology. Analysts zeroed in on the problems and went on to publish in the scientific literature their own version of the spatial patterns of temperature change across Antarctica using the same data as Steig et al. used (a combination of surface observations and satellite-borne measurements) but employing a new and improved technology.

Surprise, surprise. The “new” map of temperature change across Antarctica produced by O’Donnell et al. wasn’t all that much different from the pre-Steig vision of the temperature changes which had taken place. Once again, the warming was primarily constrained to the Antarctica Peninsula, and cooling could be found across large regions of the rest of Antarctica (Figure 3)."

Read the whole thing!

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