date: Wed, 21 Mar 2001 14:51:41 -0600
from: Jorge Snchez Sesma <jsanchez@tlaloc.imta.mx>
subject: Cooperation in climate reconstruction using proxy records.
to: tswetnam@ltrr.arizona.edu, kati@ltrr.arizona.edu, dstahle@comp.uark.edu, k.briffa@uea.ac.uk

Dear Dr Swetnam, Hirschboeck, Stahle and Briffa:

Enclosed please find the manuscript "Carbon dioxide (CO2) reconstructed
records over the past 10,000 years (10Ky)" by A. A. Aldama, F. J.
Snchez-Sesma and myself. It has been submitted to be considered for
publication in the section Letters to Nature. 

I am sending this work to your kind attention, because it takes into
account data obtained in your labs or published results of previous studies
about climate reconstruction based on tree-rings.  

The manuscript presents analysis and synthesis of the most important
information regarding carbon dioxide for the last 10 thousand years, using
calibrated proxy records to reconstruct  the CO2 record and its range of
variation as well. The results obtained therein strongly suggest: 
a) A significant reduction, in more than 20%, of the previous estimate for
the anthropogenic contribution of CO2 during the last centuries,
b) Larger variations of CO2 during the last thousand years than previous
estimates,
c) Significant lags between sea level variation and CO2.

I would like to hear your opinion, coments and suggestions, as soon as
possible, to be considered in the final version and also to stablish a
formal cooperation in this amazing subject.

For your information I am writing a paper about Global Temperature
reconstruction for last 600 My with very interesting results. When it will
be finished I will send you a copy.

Regards.

JORGE SANCHEZ-SESMA


INSTITUTO MEXICANO DE TECNOLOGIA DEL AGUA
COORDINACIN DE HIDROLOGA
PASEO CUAUHNAHUAC 8532
PROGRESO, JIUTEPEC, MORELOS
62550	MEXICO

TELS 52 (7)194000 X 775
FAX  52 (7)193901
E-MAIL: jsanchez@tlaloc.imta.mx
WEBPAGE http://nimbus.imta.mx

Attachment Converted: "c:\eudora\attach\CO2.doc"


