Joint Seminar: The natural variability of vegetation cover, land carbon storage, and fire activity during the Holocene

At the onset of the the Holocene (ca. 12 ka BP), CO2 concentration was 

 

about 265 ppm and reached a minimum of 260 by 7 ka BP. Thereafter,

 

CO2 concentration steadily increased by 20 ppm to the pre-industrial level

 

of 280 ppm. To date it is unclear what mechanisms drive atmospheric CO2

 

concentration trends dying interglacial periods. While the majority of

 

climate-carbon cycle model simulations agree that the ocean was the main

 

source of carbon entering the atmosphere, the impact of land carbon

 

changes on atmospheric CO2 concentration is less clear. To understand the

 

role of the land biosphere on atmospheric CO2 concentration changes

 

during the present interglacial, we use transient simulations with

 

the new climate-carbon cycle model CLIMBER-JSBACH. The natural

 

variability of vegetation cover, land carbon storage, and fire activity

 

are evaluated using the Holocene simulations under perturbed climate

 

forcings. It will be shown, that second-order processes, such as natural

 

fire activity, act on the same order of magnitude as the simulated

 

anomaly of in the total biomass carbon between the Holocene and

 

pre-industrial climate. 

Date

16.04.2013

Time

15:15 h

Place

Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg

Speaker

Tim Brücher, Max Planck Institute for Meteorology

Organizers

Andreas Chlond

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