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02 Oct 2008
Status : this preprint was under review for the journal BG but the revision was not accepted.
CO2 radiative forcing during the Holocene Thermal Maximum revealed by stomatal frequency of Iberian oak leaves
I. García-Amorena ,F. Wagner-Cremer ,F. Gomez Manzaneque ,T. B. van Hoof ,S. García Álvarez ,and H. Visscher
Here we analyse radiocarbon-dated Quercus leaf assemblages from northern Spain to obtain past atmospheric CO2 mixing ratios for the time period 9000–1100 cal BP by means of stomatal frequency analysis. Normalized, stomata based CO2 records show fluctuations of 20 ppmv during the Holocene that parallel Northern Hemisphere palaeotemperature reconstructions. The calculated radiative forcing of CO2 indicates a CO2 contribution of +0.1°C to the Holocene Thermal Maximum from 7 to 5 kyr BP, and −0.05°C to the Neoglacial cooling around 4 kyr BP. Derived northern hemispheric air-temperature anomalies forced by atmospheric CO2 variation suggest an active role of this trace gas as an amplifier of initial orbital forcing of Holocene climate.
Received: 27 Aug 2008 – Discussion started: 02 Oct 2008
Publisher's note : Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this paper. While Copernicus Publications makes every effort to include appropriate place names, the final responsibility lies with the authors. Views expressed in the text are those of the authors and do not necessarily reflect the views of the publisher.
I. García-Amorena ,F. Wagner-Cremer ,F. Gomez Manzaneque ,T. B. van Hoof ,S. García Álvarez ,and H. Visscher
Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
I. García-Amorena ,F. Wagner-Cremer ,F. Gomez Manzaneque ,T. B. van Hoof ,S. García Álvarez ,and H. Visscher
I. García-Amorena ,F. Wagner-Cremer ,F. Gomez Manzaneque ,T. B. van Hoof ,S. García Álvarez ,and H. Visscher
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