Monday, May 7, 2012

3943.txt

date: Tue, 28 Jun 2005 13:19:02 -0600
from: Raimund Muscheler <raimundatXYZxyzr.edu>
subject: Re: solar activity
to: Keith Briffa <k.briffaatXYZxyz.ac.uk>

Hi Keith,

I attached the two papers (Comment to Solanki, Nature, in press) and the
review article that we submitted a few weeks ago. Please keep it
confidential.

Best wishes
Raimund




>Hi Raimund
>sure am interested in this and would like full copy as soon as available
>Keith
>At 00:05 25/06/2005, you wrote:
>>Dear Keith,
>>
>>Caspar Ammann told me that you are coordinator of the discussion about
>>climate change during the last 1000 years. There are conflicting results
>>about the changes in solar activity during the last 1000 years (e.g. Bard
>>et al., 2000, Usoskin et al., 2003) with potentially important
>>implications for the discussion of the influence of natural causes on the
>>current climate change. Therefore, we discussed the radionuclide-based
>>evidence of past changes in solar activity and the reasons for the
>>conflicting results. We also included new calculations about past changes
>>in the 14C production rate that we could connect to the instrumental data.
>>
>>Caspar said that you might be interested to see the paper (I attached the
>>title & abstract below).
>>
>>Best regards
>>Raimund
>>
>>
>>Title:
>>
>>Changes in solar activity during the last 1000 years inferred from
>>radionuclide records
>>
>>Abstract:
>>Identification of the causes of past climate change requires detailed
>>knowledge of one of the most important natural factors - solar forcing.
>>Prior to the period of direct solar observations, radionuclide abundances
>>in natural archives provide the best-known proxies for changes in solar
>>activity. Here we present two independent reconstructions of changes in
>>solar activity during the last 1000 years, which are interred from 14C and
>>10Be records. These records exhibit a good agreement that allows us to
>>obtain a reliable estimate of past solar magnetic modulation of the
>>radionuclide production rates. Differences between 10Be records from
>>Antarctica and Greenland indicate that climatic changes have influenced
>>the deposition of 10Be during some periods of the last 1000 years. The
>>radionuclide-based reconstruction of past changes in solar activity does
>>not always agree with the sunspot record, which indicates that the
>>coupling between those proxies is not as close as has been assumed by some
>>authors. The tree ring 14C record and 10Be from Antarctica indicate that
>>recent solar activity is high but not exceptional with respect to the last
>>1000 years.
>>
>>
>>Raimund Muscheler
>>National Center for Atmospheric Research
>>Climate and Global Dynamics Division - Paleoclimatology
>>1850 Table Mesa Drive
>>Boulder, CO 80305-3000 USA
>>tel: 303-497-1399 fax: 303-497-1348
>>email: raimundatXYZxyzr.edu
>>
>></blockquote></x-html>
>
>--
>Professor Keith Briffa,
>Climatic Research Unit
>University of East Anglia
>Norwich, NR4 7TJ, U.K.
>
>Phone: +44-1603-593909
>Fax: +44-1603-507784
>
>http://www.cru.uea.ac.uk/cru/people/briffa/


Attachment Converted: "c:\eudora\attach\Muscheler_et_al_Nature_Comm.pdf"

Attachment Converted: "c:\eudora\attach\Muscheler_et_al_subm_to_ESR.pdf"

Raimund Muscheler
National Center for Atmospheric Research
Climate and Global Dynamics Division - Paleoclimatology
1850 Table Mesa Drive
Boulder, CO 80305-3000 USA
tel: 303-497-1399 fax: 303-497-1348
email: raimundatXYZxyzr.edu

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