Thursday, March 15, 2012

2523.txt

cc: Keith Briffa <k.briffaatXYZxyz.ac.uk>, Eystein Jansen <eystein.jansenatXYZxyz.uib.no>
date: Mon, 25 Jul 2005 16:00:02 +0200
from: Fortunat Joos <joosatXYZxyzmate.unibe.ch>
subject: Re: Fwd: RE: solar forcing over the recent millennia
to: Jonathan Overpeck <jtoatXYZxyzrizona.edu>

Hi,

Suggest to incorporate the essence of the paragraph into the forcing section.

Regards,

Fortunat

Quoting Jonathan Overpeck <jtoatXYZxyzrizona.edu>:

> Hi Keith and Fortunat - here's some text (and candid insight from
> Chap 2 CLA) on land-use change back on paleo timescales. What should
> we do w/ it? Anything?
>
> thanks
>
> best, peck
>
> >X-Sieve: CMU Sieve 2.2
> >From: "Piers Forster" <p.m.forsteratXYZxyzding.ac.uk>
> >To: "'Jonathan Overpeck'" <jtoatXYZxyzrizona.edu>
> >Subject: RE: solar forcing over the recent millennia
> >Date: Thu, 21 Jul 2005 10:21:50 +0100
> >Organization: University of Reading
> >thread-index: AcWNdVqPqgXy+jzVRjCio7W7H4cJFwAX7kMg
> >
> >
> >
> >Peck
> >
> >Here is the text on land-use. I think it was more one of our Las (Richard
> >Bets) wanting to get his work referenced as I took it out of our chapter.
> >But I'm not even 100% sure he as submitted the work he refers to here in the
> >Betts (2005) reference. But if you think you would want to cite it I could
> >ask him
> >
> >Piers
> >
> >
> >
> >
> >Since anthropogenic land cover change was in progress well before fossil
> >fuel burning began, this may have exerted a radiative forcing of climate
> >prior to the industrial era. Betts et al (2005) used a GCM to estimate the
> >radiative forcing due to anthropogenic surface albedo changes at 1750
> >relative to the natural vegetation state. The global mean shortwave
> >radiative forcing due to land cover change by 1750 was simulated as -0.06
> >Wm-2. The local forcing at 1750 reached -2 Wm-2 over Europe, China and
> >India. In Europe, approximately 12% of the land currently used for crops or
> >grazing had been modified by 1750 (Klein Goldewijk 2001). Although a
> >greater fraction (15%) of the land was cultivated in China at that time,
> >much of this was in warmer regions where the relative infrequency of snow
> >cover reduced the impact of deforestation on surface albedo. The greatest
> >forcing within China was in Manchuria, where long-lasting snow cover allowed
> >land cover change to exert large impacts on surface albedo.
> >
> >Negative radiative forcings were simulated in of some parts of the Americas,
> >but these areas were small since European settlers had arrived only
> >relatively recently and major agricultural expansion had yet to take place.
> >
> >Piers Forster (p.m.forsteratXYZxyz.ac.uk)
> >T +44 118 378 6020; F +44 118 378 8905
> >Department of Meteorology,
> >University of Reading, RG6 6BB, UK
> >
> >-----Original Message-----
> >From: Jonathan Overpeck [mailto:jtoatXYZxyzrizona.edu]
> >Sent: 20 July 2005 22:51
> >To: Piers Forster
> >Cc: Eystein Jansen; cddhratXYZxyzs.nasa.gov; Gabi Hegerl; Keith Briffa; 'V.
> >Ramaswamy'
> >Subject: RE: solar forcing over the recent millennia
> >
> >Hi Piers et al - thanks! I'm hoping (please
> >confirm, David) that David will be working to
> >ensure all of our chapters are consistent wrt
> >solar forcing - want to also make sure we're also
> >ok wrt to volcanic?
> >
> >Of course the rest of us should try to keep an eye on things too.
> >
> >We are still over our official space limit, but
> >if you want to send the land-use change material
> >you mention, we can check it out and see if we
> >can at least reference the right citations.
> >
> >Thanks again, peck
> >
> >>Hi all
> >>
> >>This a draft of our solar and volcanic sections, so you can see where we
> >>have got to and what we intend to cover - note it is still some way off
> >>being complete!
> >>
> >>There is also a section at the start on land-use changes prior to 1750 that
> >>Richard Betts, one of our LAs wanted the Paleo chapter to consider
> >>
> >>Note also the brief sections on the climate response to solar and volcanic
> >>forcings, these may also fit better elsewhere
> >>
> >>
> >>Cheers
> >>Piers
> >>
> >>
> >>
> >>
> >>Piers Forster (p.m.forsteratXYZxyz.ac.uk)
> >>T +44 118 378 6020; F +44 118 378 8905
> >>Department of Meteorology,
> >>University of Reading, RG6 6BB, UK
> >>
> >>-----Original Message-----
> >>From: Jonathan Overpeck [mailto:jtoatXYZxyzrizona.edu]
> >>Sent: 18 July 2005 18:54
> >>To: V. Ramaswamy
> >>Cc: p.m.forsteratXYZxyzding.ac.uk; cddhratXYZxyzs.nasa.gov; Eystein Jansen; Gabi
> >>Hegerl; Keith Briffa
> >>Subject: Re: solar forcing over the recent millennia
> >>
> >>Hi Ram and Piers - might be good to share, and
> >>also to share w/ David Rind, Keith Briffa and
> >>Gabi, since we need to make sure all our chapters
> > >are compatible on the issue of solar. I believe,
> >>last we talked, that you were playing pre-20th
> >>century aspects.
> >>
> >>I think David tries hard to keep in touch w/
> >>Judith L on these issues too. That should help.
> >>
> >>We're happy to share our text w/ you too.
> >>
> >>Thanks again, peck
> >>
> >>>Hi Piers,
> >>>
> >>>Would it be best to send to Jonathan Chap. 2's latest version of the
> > >>solar - and also volcano? Note that these sections are still at the
> >>>draft-stage.
> >>>
> >>>Ram
> >>>
> >>>
> >>>
> >>>On Mon, 18 Jul 2005, Jonathan Overpeck wrote:
> >>>
> >>>> Hi Fortunat et al. - thanks for this new
> >>>> material, and for the review of this new
> >>>> material. I think David Rind is up on the Chap 2
> >>>> discussion of solar, and he's also a CA/liaison
> >>>> on Chap 9. Thus, he can help make sure we are
> >>>> consistent (best confirm, David).
> >>>>
> >>>> If we have it all right and it makes sense for
> >>>> Rob to be a CA, great (and thanks!). Rob - can
> >>>> you send a short cv to me and Eystein?
> >>>>
> >>>> thanks, peck
> >>>>
> >>>> >Hi,
> >>>> >
> >>>> >I have some text on solar for section 6.5.2. I
> >>>> >tried to be as brief as possible.
> >>>> >
> >>>> >I got also input from Rob Dorland for our chapter and I have
> >summarized
> >>his
> >>>> >text, mainly in para 2.7.2.1, in the very
> >>>>last para of the attached document.
> >>>> >
> >>>> >(I have not yet checked his lower bound Maunder Minimum for the
> >earlier
> >>>> >reconstruction, but will try to do so asap if
> >>>>this last paragraph survives. I
> >>>> >suspect the lower bound should be 0.25% reduction instead of 0.15%;
> I
> >>have
> >>>> >added Bard as additional reference which
> >>>>gives the high Maunder Minimum bound
> >>>> >of a 0.65% reduction in irradiance below the present mean level)
> >>>> >
> >>>> >KEITH AND DAVID could you check whether you
> >>>>agree with the writing. Bette has
> >>>> >already looked over it here at NCAR and found the expansion
> >worthwhile.
> >>>> >
> >>>> >PECK AND EYSTEIN, can you put Rob van Dorland
> >>>>down as contributing author if
> >>>> >this expansion on solar forcing is welcomed.
> >>>> >
> >>>> >ROB: would you mind to send me the references
> >>>>for your text in endnote format?
> >>>> >(I usually use bibtex and are just in the transition).
> >>>> >
> >>>> >With best wishes,
> >>>> >
> >>>> >Fortunat
> >>>> >
> >>>> >
> >>>> >
> >>>> >
> >>>> >--
> >>>> >e-mail: joosatXYZxyzmate.unibe.ch;
> >>>> >
> >>>> >Until November 23
> >>>> > National Centre for Atmospheric Research, Terrestrial Sciences,
> >CGD
> >>>> > 1850 Table Mesa Drive, Boulder, CO, 80305
> >> >> > ++1-303 497 13 44 (office)
> >>>> >
> >>>> > home address:
> >>>> > 3655 Emerson Avenue, Boulder, CO, 80305
> >>>> > ++1-303 494 69 52 (home)
> >>>> >
> >>>> >After November 24
> >>>> > Climate and Environmental Physics
> >>>> > Sidlerstr. 5, CH-3012 Bern
> >>>> > Phone: ++41(0)31 631 44 61 Fax: ++41(0)31 631 87 42
> >>>> > Internet: http://www.climate.unibe.ch/~joos/
> >>>> >
> >>>> >Attachment converted: Macintosh
> >>>> >HD:joos_Ch06_FOD_6.5.2_s#8A3ED.doc (WDBN/<IC>)
> >>>> >(0008A3ED)
> >>>> >Attachment converted: Macintosh
> >>>> >HD:dorland_Ch02s7_ZOD_pr#8A3EE.doc (WDBN/<IC>)
> >>>> >(0008A3EE)
> >>>>
> >>>>
> >>>> --
> >>>> 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
> >>>> http://www.geo.arizona.edu/
> >>>> 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
> >>http://www.geo.arizona.edu/
> >>http://www.ispe.arizona.edu/
> >>
> >>Attachment converted: Macintosh HD:ch2topaleo19July.doc (WDBN/<IC>)
> >(0008AD67)
> >
> >
> >--
> >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
> >http://www.geo.arizona.edu/
> >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
> http://www.geo.arizona.edu/
> http://www.ispe.arizona.edu/
>


--
e-mail: joosatXYZxyzmate.unibe.ch;

Until November 23
National Centre for Atmospheric Research, Terrestrial Sciences, CGD
1850 Table Mesa Drive, Boulder, CO, 80305
++1-303 497 13 44 (office)

home address:
3655 Emerson Avenue, Boulder, CO, 80305
++1-303 494 69 52 (home)

After November 24
Climate and Environmental Physics
Sidlerstr. 5, CH-3012 Bern
Phone: ++41(0)31 631 44 61 Fax: ++41(0)31 631 87 42
Internet: http://www.climate.unibe.ch/~joos/

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