06 Feb '12, 2pm

Global Temperatures, Volcanic Eruptions, and Trees that Didn’t Bark

Global Temperatures, Volcanic Eruptions, and Trees that Didn’t Bark

Show in the above figure (Figure 2d from the article) is the D’Arrigo et al tree-ring based NH reconstruction (blue) along with the climate model (NCAR CSM 1.4) simulated NH mean temperatures (red) and the “simulated tree-ring” NH temperature series based on driving the biological growth model with the climate model simulated temperatures (green). The two insets focus on the response to the AD 1258 and AD 1809+1815 volcanic eruption sequences. The attenuation of the response is produced primarily by the loss of sensitivity to further cooling for eruptions that place growing season temperatures close to the lower threshold for growth. The smearing and delay of the cooling, however, arises from another effect: when growing season lengths approach zero, we assume that no growth ring will be detectable for that year. That means that an age model error of 1 year will be introdu...

Full article: http://www.realclimate.org/index.php/archives/2012/02/glo...

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The Year After McLean - A Review of 2011 Global Temperatures:

The Year After McLean - A Review of 2011 Global...

skepticalscience.com 11 Feb '12, 10pm

multiple linear regression approach, ENSO had a cooling effect of approximately 0.08°C on the 2011 global surface temperat...

Happy Tu Bishvat, the new year for trees

Happy Tu Bishvat, the new year for trees

mnn.com 07 Feb '12, 9pm

In that spirit, some people see Tu Bishvat as a time not just to plant new trees, but to protect existing ones. That's why...