Tuesday, March 24, 2015

Satellites show no warming during the past 17 years while climate models expected warming

See Score a Victory for Cruz over Brown in Most Recent Climate Change Scuffle by Paul C. "Chip" Knappenberger of Cato. Excerpts:
"Cruz, on the other hand, told a more restrained story—that data doesn’t support many alarmist claims and that satellites show no warming during the past 17 years while climate models expected warming—one which comports better with the science that he portrayed."

"Consider this new study by a team led by Geophysical Fluid Dynamic Laboratory’s (GFDL) Thomas Delworth that examined the association between the global warming hiatus and drought in western North America (including California). Turns out, according to these scientists, both stemmed from a similar cause—a change in the patterns of winds across the tropical Pacific Ocean. Further, they suggest this pattern was not overly consistent with expectations from human-caused climate change. Here is an excerpt from that paper:
The strong connection between the intensification of Pacific trades and the drying in western North America observed over the past decade suggests that this drying cannot be connected in a straightforward fashion to greenhouse gas increases. In most coupled [climate model] simulations anthropogenic forcing produces a long-term weakening of the Walker circulation and tropical Pacific trade winds, but with substantial intrinsically-generated variability on decadal scales (Vecchi et al. 2006). Therefore, unless it can be shown that the strengthened trade winds are a result of either natural or human-induced radiative forcing changes, the model results suggest that the observed drying over the western U.S. over the last decade may be primarily due to natural variability, and therefore not necessarily a harbinger of a secular drying trend (Hoerling et al. 2010; Seager and Naik 2012). These results highlight how vulnerable western North America is to severe decadal swings in hydroclimate arising from internal variations of the climate system."

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