Global temperature and carbon dioxide (CO2) reconstructed records for the past 10,000 years (10Ky).

 

Jorge Sánchez-Sesma 1,2,4

Alvaro A. Aldama1,2

Francisco J. Sánchez-Sesma3

 

1 Instituto Mexicano de Tecnología del Agua; Jiutepec, Mor., 62550; MEXICO.

2 DEPFI Campus Morelos; Universidad Nacional Autónoma de México; Jiutepec, Mor. 62550; MEXICO

3 Instituto de Ingeniería; Universidad Nacional Autónoma de México; Ciudad Universitaria, Circuito Escolar; Coyoacán 04510, México, D.F.; MÉXICO

  1. To whom correspondence should be addressed (E-mail: jsanchez@tlaloc.imta.mx).

 

Abstract

 

Based on proxy and instrumental records a global temperature records was reconstructed. The reconstuction that was based in linear transformations permit to assess the range of variation of global temperatures. Reconstructed global temperatures for the Medieval Warm Period and Little Ice Age, and other periods suggest both significant climatic oscillations during the Holocene. The reconstuction of the carbon dioxide record was obtained with a linear transformation of the reconstructed record of global temperature. The reconstructed record of CO2 for the last 10Ky, shows a systematic bias of about 23 p.p.m.v. for the pre-industrial CO2 content of air, values that strongly suggest a significant reduction, of about 25%, of the estimate for anthropogenic contribution of CO2 during the last centuries.