Details

Autor(en) / Beteiligte

• Liu, X. Y
• Gao, Q
• Han, M
• Jin, J. H

Titel

Estimates of late middle Eocene pCO.sub.2 based on stomatal density of modern and fossil Nageia leaves

Ist Teil von

• Climate of the past, 2016-02, Vol.12 (2), p.241

Ort / Verlag

Copernicus GmbH

Erscheinungsjahr

2016

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Atmospheric pCO.sub.2 concentrations have been estimated for intervals of the Eocene using various models and proxy information. Here we reconstruct late middle Eocene (42.0-38.5 Ma) pCO.sub.2 based on the fossil leaves of Nageia maomingensis Jin et Liu collected from the Maoming Basin, Guangdong Province, China. We first determine relationships between atmospheric pCO.sub.2 concentrations, stomatal density (SD) and stomatal index (SI) using “modern” leaves of N. motleyi (Parl.) De Laub, the nearest living species to the Eocene fossils. This work indicates that the SD inversely responds to pCO.sub.2, while SI has almost no relationship with pCO.sub.2 . Eocene pCO.sub.2 concentrations can be reconstructed based on a regression approach and the stomatal ratio method by using the SD. The first approach gives a pCO.sub.2 of 351.9 ± 6.6 ppmv, whereas the one based on stomatal ratio gives a pCO.sub.2 of 537.5 ± 56.5 ppmv. Here, we explored the potential of N. maomingensis in pCO.sub.2 reconstruction and obtained different results according to different methods, providing a new insight for the reconstruction of paleoclimate and paleoenvironment in conifers.