From: Keith Briffa <k.briffa@uea.ac.uk>
To: Fortunat Joos <joos@climate.unibe.ch>, David Rind <drind@giss.nasa.gov>
Subject: Re: Gavin Smchmidt'comment
Date: Fri Jul 21 07:54:29 2006
Cc: Jonathan Overpeck <jto@u.arizona.edu>, Ricardo Villalba <ricardo@lab.cricyt.edu.ar>, Eystein Jansen <eystein.jansen@geo.uib.no>, cddhr@giss.nasa.gov, t.osborn@uea.ac.uk

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

     Hi,
     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:

     Jonathan,
     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
     2-7).
     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).
     David
     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
     Europe.
     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.
     David
     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
     6.6.3.1   Solar forcing
     6.6.3.2   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,
     Ricardo
     2.7 Natural Forcings
     2.7.1 Solar Variability
     2.7.1.1 Direct observations of solar irradiance
     2.7.1.1.1 Satellite measurements of total solar irradiance
     2.7.1.1.2 Observed decadal trends and variability
     2.7.1.1.3 Measurements of solar spectral irradiance
     2.7.1.2 Estimating past solar radiative forcing
     2.7.1.2.1 Reconstructions of past variations in solar irradiance
     2.7.1.2.2 Implications for solar radiative forcing
     2.7.1.3 Indirect effects of solar variability
     2.7.2 Explosive Volcanic Activity
     2.7.2.1 Radiative effects of volcanic aerosols
     2.7.2.2 Thermal, dynamic and chemistry perturbations forced by volcanic
     aerosols
     ----- Original Message -----
     From: "Tim Osborn" <t.osborn@uea.ac.uk>
     To: "Jonathan Overpeck" <jto@u.arizona.edu>; "Keith Briffa"
     <k.briffa@uea.ac.uk>
     Cc: "Eystein Jansen" <eystein.jansen@geo.uib.no>; "Ricardo Villalba"
     <ricardo@lab.cricyt.edu.ar>; "joos" <joos@climate.unibe.ch>
     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
      and
      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
      yes
      >2. remove the dotted (long instrumental) curve from the middle panel
      yes
      >3. replace the red shaded region in the bottom panel with the
      >grey-scale one used in Fig 6.13
      yes
      >4. label only every increment of 10 in the grey-scale bar (formally
      >color) in the bottom panel
      yes
      >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.
      yes
      >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

     in?

      >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.
      done.
      Cheers
      Tim
      Dr Timothy J Osborn, Academic Fellow
      Climatic Research Unit
      School of Environmental Sciences, University of East Anglia
      Norwich  NR4 7TJ, UK
      e-mail:   t.osborn@uea.ac.uk
      phone:    +44 1603 592089
      fax:      +44 1603 507784
      web:      [1]http://www.cru.uea.ac.uk/~timo/
      sunclock: [2]http://www.cru.uea.ac.uk/~timo/sunclock.htm
      **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
     [3]http://www.geo.arizona.edu/
     [4]http://www.ispe.arizona.edu/

     --
     ///////////////////////////////////////////////////////////////////////////
     ///////////////////////////////////////////////////////////////////////////

     --
     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
     [5]http://www.geo.arizona.edu/
     [6]http://www.ispe.arizona.edu/

     --
       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]http://www.climate.unibe.ch/~joos/

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

   Phone: +44-1603-593909
   Fax: +44-1603-507784
   [8]http://www.cru.uea.ac.uk/cru/people/briffa/

References

   1. http://www.cru.uea.ac.uk/~timo/
   2. http://www.cru.uea.ac.uk/~timo/sunclock.htm
   3. http://www.geo.arizona.edu/
   4. http://www.ispe.arizona.edu/
   5. http://www.geo.arizona.edu/
   6. http://www.ispe.arizona.edu/
   7. http://www.climate.unibe.ch/~joos/
   8. http://www.cru.uea.ac.uk/cru/people/briffa/

