Transient Changes in the Global Carbon Cycle During the Last Glacial/Interglacial Transition


Contact
pkoehler [ at ] awi-bremerhaven.de

Abstract

The global carbon cycle plays a significant role in glacial/interglacial transitions. On one hand because carbon reservoirs and exchange rates are subject to external climateconditions, on the other hand because changes in carbon dioxide concentrations lead to amplification and mediation of regional climate variations. Time slice experimentswere so far unable to unambiguously explain the driving forces of the glacial/interglacial change in atmospheric CO2 of about 100 ppmv. Additional information can begained from the temporal evolution of the carbon cycle using transient model runs. Here we used a coupled atmosphere/biosphere/ocean box model of the global carboncycle to quantify changes in CO2 and d13C observed in Antarctic ice core records. To this end the model is transiently driven by various proxy records overthe last 25,000 years. First results show that the estimated increase in the terrestrial biosphere together with the measured atmospheric pCO2 are difficult to reconcilewith current theories of oceanic changes in the carbon cycle. In addition a significant role of the biosphere on changes in the isotopic composition of atmospheric CO2is supported.



Item Type
Conference (Poster)
Authors
Divisions
Programs
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
Eos Trans. AGU, 84(46), Fall Meet. Suppl., Abstract GC12A-0145. 8.-12.12.2003, San Francisco, USA..
Eprint ID
9380
Cite as
Köhler, P. and Fischer, H. (2003): Transient Changes in the Global Carbon Cycle During the Last Glacial/Interglacial Transition , Eos Trans. AGU, 84(46), Fall Meet. Suppl., Abstract GC12A-0145. 8.-12.12.2003, San Francisco, USA. .


Download
[img]
Preview
PDF (Fulltext)
Khl2003l.pdf

Download (437kB) | Preview
Cite this document as:

Share

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item