Wednesday, December 21, 2011


From: Keith Briffa <>
To: Fortunat Joos <>, David Rind <>
Subject: Re: Gavin Smchmidt'comment
Date: Fri Jul 21 07:54:29 2006
Cc: Jonathan Overpeck <>, Ricardo Villalba <>, Eystein Jansen <>,,

I suggest only one of us - Fortunat - make these changes in his version , otherwise we are
all going to do it slightly differently.
At 08:16 19/07/2006, Fortunat Joos wrote:

What we agreed was actually to keep line 25 to line 34 on p 6-35 and not just until line
30. (As well line 50, p-36 line 2-7).
The sentence on line 32/33 that there is general agreement in the evolution of the
different proxies is important as there is in general much confusion about this and this
is a chapter 6 statement covering the whole millennium. The sentence also links nicely
to the next sentence on line 50. Yes, as agreed in Bergen delete the other parts if
chapter 2 indeed is going to cover it. I have not done so in my revision as I wanted to
hear what chap 2 is doing before deleting.
Peck, in total we will delete 22 line. Note that I have also squezzed out a few line in
the sulfur section. Making progress!
Regards, Fortunat
David Rind wrote:

Keith and I discussed this at the meeting; basically what we need to keep is:
P. 6-25, lines 25-30, first sentence on line 50, and P. 6-26 the first paragraph (lines
All the rest is discussed in one form or another in Chapter 2, pp. 55-56.
Concerning the volcanic forcing, there isn't nearly as much overlap, and Chapter 6 did
not have very much anyway - I think it would be useful to keep what's there, adding just
a reference to Chapter 2 (add: "see also
Chapter 2", at the end of line 26). (I'm assuming that Fig. 6-13a still includes the
solar and volcanic forcing).
At 11:40 AM -0600 7/18/06, Jonathan Overpeck wrote:

Hi David - it's good to know you can get to work before someone, even if they live in
Your plan sounds good, and is it safe to assume that you will be making sure Chap 2 gets
the right material from chap 6, and that we can thus pare our discussion of past solar
and volcanic forcing down to a minimum? Can you give us an update of what they will not
cover that we should (i.e., looking at section 6.6)?
Many thanks, Peck

Hi All,
[It's a sad state of affairs if I'm the one who gets to work sooner! (regardless of the
time difference).]
What is discussed below is basically what we thought in response to Gavin's comment -
that we would basically cross-reference chap 2, where the primary discussion would
occur. It's consistent with chapter 2's general discussion of how forcings have changed
over time, and would seem odd if chapter 2 left out past solar and volcanic forcing.
Chapter 2 should feel free to utilize anything that existed in Chapter 6 on these issues
to complement their discussion, if the need arises. Once that is finalized, Chapter 6
can then make the proper cross-references.
At 10:26 AM -0600 7/18/06, Jonathan Overpeck wrote:

Hi Ricardo - good points. We did discuss this in Bergen, and David Rind (as a Chap 2 CA)
was going to help make sure we kept things covered in chap 2, while cutting our solar
and volcanic discussions in chap 6. The key will be cross-referencing chap 2 carefully.
So, Keith, Ricardo and David - please interact to figure out how to work this
efficiently. Perhaps David could comment first since he's at work sooner.
Thanks... Best, Peck

Hi all!
In comment 6-811, Gavin Schmidt points out that our sections Solar forcing Volcanic forcing
largely replicate the discussion in Chap. 2 on the same topics. I checked
Chap. 2, and they provide a large (almost 8 pages in the SOD) discussion
mainly on solar and but also on volcanic forcings. Gavin suggests that only
the implementation issues should be discussed in our chapter and leave the
most general information in Chapter 2. We can substantially short our
section following his advice. Please, find below the outline of the
sections in Chap. 2 dealing with solar and volcanic forcings. Cheers,
2.7 Natural Forcings
2.7.1 Solar Variability Direct observations of solar irradiance Satellite measurements of total solar irradiance Observed decadal trends and variability Measurements of solar spectral irradiance Estimating past solar radiative forcing Reconstructions of past variations in solar irradiance Implications for solar radiative forcing Indirect effects of solar variability
2.7.2 Explosive Volcanic Activity Radiative effects of volcanic aerosols Thermal, dynamic and chemistry perturbations forced by volcanic
----- Original Message -----
From: "Tim Osborn" <>
To: "Jonathan Overpeck" <>; "Keith Briffa"
Cc: "Eystein Jansen" <>; "Ricardo Villalba"
<>; "joos" <>
Sent: Monday, July 17, 2006 12:25 PM
Subject: Re: Special instructions/timing adjustment

Hi all,
I'm halfway through these changes and will get the revised figures
out to you probably tomorrow, except maybe the SH one, because:
I'm not sure if the van Ommen (pers. comm.) data shown by Jones &
Mann and suggested by Riccardo are the data to use or not. Is it
published properly? I've seen the last 700 years of the Law Dome 18O
record published, so perhaps we should show just the period since
1300 AD? That period appears in:
Mayewski PA, Maasch KA, White JWC, et al.
A 700 year record of Southern Hemisphere extratropical climate variability
ANNALS OF GLACIOLOGY 39: 127-132 2004
Goodwin ID, van Ommen TD, Curran MAJ, et al.
Mid latitude winter climate variability in the South Indian and
southwest Pacific regions since 1300 AD
CLIMATE DYNAMICS 22 (8): 783-794 JUL 2004
See below for some more comments in respect to individual figures.
At 21:36 30/06/2006, Jonathan Overpeck wrote:
>Figure 6.10.
>1. shade the connection between the top and middle panels
>2. remove the dotted (long instrumental) curve from the middle panel
>3. replace the red shaded region in the bottom panel with the
>grey-scale one used in Fig 6.13
>4. label only every increment of 10 in the grey-scale bar (formally
>color) in the bottom panel
>5. Increase font sizes for axis numbering and axis labeling - all
>are too small. You can figure out the best size by reducing figs to
>likely page size minus margins. We guess the captions need to be
>bigger by a couple increments at least.
>Figure 6.11.
>1. This one is in pretty good shape except that Ricardo has to
>determine if S. African boreholes need to be removed.
I think Henry said they were published and could stay


>Figure 6.12
>1. again, please delete S. African borehole if Ricardo indicates
>it's still not published.
I think Henry said they could stay.
>2. consider adding Law Dome temperature record - Ricardo is
>investigating, but perhaps Keith/Tim can help figure out if it's
>valid to include. Feel free to check with Valerie on this too, as
>she seems to know these data at least a little
Already discussed above.
>3. also, please increase font sizes and make sure they match 6.10 -
>probably better to use bold fonts
You are right that I've mixed bold and non-bold. When reduced to
small size, the non-bold actually read more clearly than the bold, I
think, so I'll standardise on non-bold. It's not possible to
completely standardise on the size, because each figure I provide
might be scaled by different amounts. I don't know final figure
size, so will make a good guess. Should be ok.
>Figure 6.13
>1. we are going to split the existing 6.13 into two figure. The
>first is 100% Tim's fig., and is just an upgrade of the existing
>6.13 a-d, with the only changes being:
>1a. delete the old ECHO-G red dashed line curve in panel d, and
Keith says this was discussed and rejected, so I should keep old ECHO-G


>1b. please also increase font sizes and make sure they match 6.10
>and 12 - please use bold fonts.
ok, as discussed above.
>2. The existing 6.13e is going to become a new 6.14, with the
>addition of a new forcings panel "a" on top of the existing panel e
>(which becomes 6.14b). To make this happen, Tim and Fortunat have to
>coordinate, as Tim has the forcing data (and knows what we what) and
>Tim has the existing figure. We suspect it will be easier for
>Fortunat to give Tim data and layout advice, and for Tim to make a
>figure that matches the other figs he's doing. PLEASE NOTE that this
>fig can't be as large as the existing 6.13a-d, but needs to be more
>compact to permit its inclusion.
Dr Timothy J Osborn, Academic Fellow
Climatic Research Unit
School of Environmental Sciences, University of East Anglia
Norwich NR4 7TJ, UK
phone: +44 1603 592089
fax: +44 1603 507784
web: [1]
sunclock: [2]
**Norwich -- City for Science:
**Hosting the BA Festival 2-9 September 2006

Jonathan T. Overpeck
Director, Institute for the Study of Planet Earth
Professor, Department of Geosciences
Professor, Department of Atmospheric Sciences
Mail and Fedex Address:
Institute for the Study of Planet Earth
715 N. Park Ave. 2nd Floor
University of Arizona
Tucson, AZ 85721
direct tel: +1 520 622-9065
fax: +1 520 792-8795


Jonathan T. Overpeck
Director, Institute for the Study of Planet Earth
Professor, Department of Geosciences
Professor, Department of Atmospheric Sciences
Mail and Fedex Address:
Institute for the Study of Planet Earth
715 N. Park Ave. 2nd Floor
University of Arizona
Tucson, AZ 85721
direct tel: +1 520 622-9065
fax: +1 520 792-8795

Climate and Environmental Physics,
Physics Institute, University of Bern
Sidlerstr. 5, CH-3012 Bern
Phone: ++41(0)31 631 44 61 Fax: ++41(0)31 631 87 42
Internet: [7]

Professor Keith Briffa,
Climatic Research Unit
University of East Anglia
Norwich, NR4 7TJ, U.K.

Phone: +44-1603-593909
Fax: +44-1603-507784



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