Title
CO2 radiative forcing during the Holocene Thermal Maximum revealed by stomatal frequency of Iberian oak leaves
Author
García-Amorena, I.
Wagner-Cremer, F.
Gomez Manzaneque, F.
van Hoof, T.B.
García Álvarez, S.
Visscher, H.
TNO Bouw en Ondergrond
Publication year
2008
Abstract
Here we analyse radiocarbon-dated Quercus leaf assemblages from northern Spain to obtain past atmospheric CO2 mixing ratios for the time period 9000ĝ€"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.
Subject
Geosciences
air temperature
atmospheric chemistry
carbon dioxide
deciduous tree
Hypsithermal
Neoglacial
Northern Hemisphere
orbital forcing
paleotemperature
radiative forcing
radiocarbon dating
reconstruction
stomata
trace gas
Eurasia
Europe
Southern Europe
Spain
Quercus
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http://resolver.tudelft.nl/uuid:030ea55d-8a07-45b0-a660-b68e49aae4d1
TNO identifier
241011
ISSN
1810-6277
Source
Biogeosciences Discussions, 5 (5), 3945-3964
Document type
article