Reconstructing atmospheric CO2 during the Plio-Pleistocene transition by fossil Typha

Reconstructing atmospheric CO2 during the Plio-Pleistocene transition by fossil Typha

© 2014 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 21(2015), 2 vom: 28. Feb., Seite 874-81
1. Verfasser: Bai, Yun-Jun (VerfasserIn)
Weitere Verfasser: Chen, Li-Qun, Ranhotra, Parminder S, Wang, Qing, Wang, Yu-Fei, Li, Cheng-Sen
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2015
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article Research Support, Non-U.S. Gov't North China Northern Hemisphere glaciation Paleo-CO2 Plio-Pleistocene transition Typha orientalis stomatal index Carbon Dioxide 142M471B3J
Beschreibung
Zusammenfassung:© 2014 John Wiley & Sons Ltd.
The Earth has undergone a significant climate switch from greenhouse to icehouse during the Plio-Pleistocene transition (PPT) around 2.7-2.4 million years ago (Ma), marked by the intensification of the Northern Hemisphere glaciation (NHG) ~2.7 Ma. Evidence based on oceanic CO2 [(CO2)aq], supposed to be in close equilibrium with the atmospheric CO2 [(CO2)atm], suggests that the CO2 decline might drive such climate cooling. However, the rarity of direct evidence from [CO2]atm during the interval prevents determination of the atmospheric CO2 level and further assessment on the impact of its fluctuation. Here, we reconstruct the [CO2]atm level during 2.77-2.52 Ma based on a new developed proxy of stomatal index on Typha orientalis leaves from Shanxi, North China, and depict the first [CO2]atm curve over the past 5 Ma by using stomata-based [CO2]atm data. Comparisons of the terrestrial-based [CO2]atm and the existed marine-based [CO2]aq curves show a similar general trend but with different intensity of fluctuations. Our data reveal that the high peak of [CO2]atm occurred at 2.77-2.52 Ma with a lower [CO2]aq background. The subsequent sharp fall in [CO2]atm level might be responsible for the intensification of the NHG based on their general temporal synchronism. These findings shed a significant light for our understanding toward the [CO2]atm changes and its ecological impact since 5 Ma
Beschreibung:Date Completed 22.10.2015
Date Revised 26.01.2015
published: Print-Electronic
Citation Status MEDLINE
ISSN:1365-2486
DOI:10.1111/gcb.12670