FromStefan RahmstorfDateThu, 13 Jan 2005 19:15:25 +0100
ToKeith Briffa
CCJonathan T. Overpeck, Eystein Jansen
Subjectcomments on Briffa, last millennium

Dear Keith,

you've done a great job on the touchy subject of the last millennium,
which is central to our whole chapter.
My comments to that are threefold:
(1) If you could shorten the text somewhat, it could become more powerful
(2) Some small edits & comments are in the attached doc
(3) I propose some improvements to the figures as follows.
- Fig 1a the land temps seem to go off plot, temperature scale needs to
be extended
- we need a break between panels a and the rest, since it's a different
time scale on the x axis
- Fig 1c also has one curve going off the top
- Panels 1b-d might run the time axis up to 2010 or so, else the
important rise at the end is hidden in the tick-marks and less obvious
than it should be
- the legends need to say what the baseline period (zero line of y-axis)
is (hard to find this in the axis label)
- this baseline should be the same for all curves, i.e. 1961-1990. Fig
2d says 1901-1960 - it's not ideal to have a different one, as compared
to Fig 1. Also, is it true? Surely the Storch curve is not shown
relative to this baseline, it's way above it. Aligning it like this
could lead to the dangerous misunderstanding that Storch suggests a much
warmer medieval time compared to everyone else, which of course is not
the case.

I hope this helps.

Cheers, Stefan

--
Stefan Rahmstorf
www.ozean-klima.de
www.realclimate.org




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