Preprints
https://doi.org/10.5194/bgd-5-3945-2008
https://doi.org/10.5194/bgd-5-3945-2008
02 Oct 2008
 | 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

Abstract. 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.

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 preprint. The responsibility to include appropriate place names lies with the authors.
I. García-Amorena, F. Wagner-Cremer, F. Gomez Manzaneque, T. B. van Hoof, S. García Álvarez, and H. Visscher
 
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Status: closed
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
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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