Changes

{{cquote|1. '''There are few tree-core series that extend beyond the early 1980s. This is because many of the sites we're using were cored before the early 1980s. So most tree-ring records just don't exist post 1980.''' [Phil Jones]

{{cquote|1. '''There are few tree-core series that extend beyond the early 1980s. This is because many of the sites we're using were cored before the early 1980s. So most tree-ring records just don't exist post 1980.''' [Phil Jones]

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If you look at the figure in the attached article in Science by Briffa and Osborn, you will note that tree-ring temperature reconstructions are flat from 1950 onward. I asked Mike Mann about this discrepancy at a meeting recently, and he said he didn't have an explanation. '''It sounded like it is

If you look at the figure in the attached article in Science by Briffa and Osborn, you will note that tree-ring temperature reconstructions are flat from 1950 onward. I asked Mike Mann about this discrepancy at a meeting recently, and he said he didn't have an explanation. '''It sounded like it is an embarrassment to the tree ring community that their indicator does not seem to be responding to the pronounced warming of the past 50 years.''' Ed Cook of the Lamont Tree-Ring Lab tells me that there is some speculation that stratospheric ozone depletion may have affected the trees, in which

an embarrassment to the tree ring community that their indicator does not seem to be responding to the pronounced warming of the past 50 years.''' Ed Cook of the Lamont Tree-Ring Lab tells me that there is some speculation that stratospheric ozone depletion may have affected the trees, in which

case the pre-1950 record is OK. But alternatively, he says '''it is possible that the trees have exceeded the linear part of their temperature-sensitive range, and they no longer are stimulated by temperature. In this case there is trouble for the paleo record.''' Kieth Briffa first documented this

case the pre-1950 record is OK. But alternatively, he says '''it is possible that the trees have exceeded the linear part of their temperature-sensitive range, and they no longer are stimulated by temperature. In this case there is trouble for the paleo record.''' Kieth Briffa first documented this

late 20th century loss of response.

late 20th century loss of response.