To: "Michael E. Mann" <email@example.com>, "Folland, Chris" <firstname.lastname@example.org>, Keith Briffa <email@example.com>, "Folland, Chris" <firstname.lastname@example.org>
Subject: RE: IPCC revisions
Date: Thu, 23 Sep 1999 17:20:56 +0100
Here are my thoughts on the text you sent. Keith will be sending some
as well hopefully later today. One important aspect Keith will address is
whether you're using the latest Briffa et al curve. We know you're not but
one with the greater low frequency and therefore much better chance of
looking much better with the other two series, isn't yet published. We know
it looks better in plots we have here.
p1 line 10 - say mid-19th century rather than the 20th century
lines 18-20 - seems a bit too much here with three refs on laminated
line 46 Add Briffa et al (1998b) to Cook(1995).
p2 line 59 - I would suggest changing 'a particularly' to 'the most' .
line 64 - I would add a reference here to the paper by Crowley and
Kim (1999) in GRL (July) where this aspect is also discussed.
p3 line 101 - I would add Argentina as well as Chile adding a ref to
Villalba (1990 ) in QR.
line 108 change 'key' to 'vital'
line 119 'have providing' to 'provide' . There are several instances
where the text doesn't read that well. I suspect as there are several
iterations to go it is not that important yet !
The coral section is just about the right size now and is justly
devoid of references !
p4 line 151 I would add a reference here to Morgan and van Ommen (1997)
'Seasonality in late-Holocene climate from ice core records',
The Holocene 7, 351-4. This is the Law Dome core which is the best
available with regards to dating in either hemisphere. It should be
As with the coral section the ice core section expresses some
cautionary notes with regard to dating etc which I think are justified.
I suspect teh contrast with the tree-ring section will draw some
criticism. Just a warning !
As none of the multiproxy reconstuctions use any sediment information
this section seems overlarge and could be reduced.
p189 century-scale add in the 'y'
p5 The borehole section is also a bit overlong. I don't know whether the
map really adds something. Not that vehement on this.
With respect to comapring high and low frequency aspects the diagram
comparing CET with the UK boreholes is now out. I've sent a copy to
Chris. It is in :
Jones PD, 1999 : Classics in physical geography revisited - Manley's
CET series. Progress in Physical Geography 23, 425-428.
line 245 the 'is' is not needed.
p6 I still think that a reference to Raper et al (1996) would be good
here. This models a glacier in northern Sweden using the northern
Fennoscandian temperature reconstructions since AD 500. Again it shows
how a low frequency estimate (the glacial snout position) can be compared
with a high-frquency temperature reconstruction from trees.
Raper, SCB, Briffa KR and Wigley TML, 1996: Glacial change in northern
Sweden from AD 500: a simple geometric model of Storglaciaren. Journal
of Glaciology 42, 341-351.
line 268 IPCC(1996) earlier - is it 95 or 96
p 7 line 295 I would like to add my paper in Reviews of Geophysics in 1999
as that also says that 1998 was likely to be the warmest year of the
line 334 I would like to see Bradley (1999). I must get a copy from
Ray in Venice.
p7-9 All need a careful read through for English and the arguments.
At the bottom of p8 I think you make too much of the differences in the
ranking of the centuries. The boreholes would agree with my series with
the 17th being colder than the 19th, although they may not be able to
resolve the timescales then.
Is the Crowley and Lowery (1999) the paper Tom's submitted to Ambio ?
I've not commented much on this final section as again I suspect there
are many things you will have to justify in the next two sets of reviews.
On the whole I think most is OK and I support the final paragraph. I
don't believe the astronomical argument as an explaination over the
last 1000 years but we can differ on that.
I know I would have written this final section 2.3.3 somehat differently
with different emphases and slants but the basic final conclusion would
have been the same.
Prof. Phil Jones
Climatic Research Unit Telephone +44 (0) 1603 592090
School of Environmental Sciences Fax +44 (0) 1603 507784
University of East Anglia
Norwich Email email@example.com