The annual average global surface temperatures from 108 individual CMIP5 climate model runs forced with historical (+ RCP45 since 2006) forcings were
obtained from the KNMI Climate Explorer website. Linear trends were computed through the global temperatures from each run, ending in 2014 and beginning
each year from 1951 through 2005. The trends for each period (ranging in length from 10 to 64 years) were averaged across all model runs (black dots). The
range containing 90 percent (thin black lines), and 95 percent (dotted black lines) of trends from the 108 model runs is indicated. The observed linear trends for
the same periods were calculated from the annual average global surface temperature record compiled by the U.K. Hadley Center (HadCRUT4) (colored dots) (the
value for 2014 was the 10-mon, January through October, average). Observed trend values which were less than or equal to the 2.5th percentile of the model trend
distribution were colored red; observed trend values which were between the 2.5th and the 5th percentile of the model trend distribution were colored yellow; and
observed trend values greater than the 5th percentile of the model trend distribution were colored green.

#AGU14 poster demonstrates the divergence problem with IPCC climate models and observations

Earlier this week I to reported on some of the poster sessions at the American Geophysical Meeting but was told the next day that I’m not allowed to photograph such posters to report on them. However, when the authors send me the original, for which they own the copyright, there’s nothing AGU can complain about…

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#AGU14 Stanford researchers use a girl scout troop as guinea pigs for climate ‘behavior change’

From the Stanford University press office: AGU talk: Scaling climate change communication for behavior change In a previous randomized controlled trial, Stanford University researchers developed two curricula for Girl Scouts to use energy more efficiently: one on energy use at home, and the other in transportation and food. Both courses were effective for girls in…

Esperetal2014b

New Study: Two Thousand Years of Northern European Summer Temperatures Show a Downward Trend

In a paper published in the Journal of Quaternary Science, Esper et al. (2014) write that tree-ring chronologies of maximum latewood density (MXD) “are most suitable to reconstruct annually resolved summer temperature variations of the late Holocene.” And working with what they call “the world’s two longest MXD-based climate reconstructions” – those of Melvin et…