 |
| Titel |
A simple model of soil genesis and weathering suitable for long term carbon cycle studies. |
| VerfasserIn |
S. Arens, A. Kleidon |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026400
|
|
|
|
|
|
| Zusammenfassung |
| In order to understand the functioning of the silicate weathering feedback in the geological
carbon cycle, we need to characterize the processes which control global spatial variability of
weathering rates. This variability of weathering rates and of associated soil states reveals a
high dependency on climate and weathering history. Here, the concept of a dynamic model of
soil genesis and associated rock weathering rates is presented in the perspective of application
to the long term geological carbon cycle. In the model formulation the state of
the soil system, i.e. temperature, water balance, depth, composition and partial
pressure of carbon dioxide (CO2) determines the outflow of weathered elements to
rivers and ultimately the ocean. This allows us to quantify the sensitivity of silicate
weathering rates to climate, the direct and indirect effects of vegetation, and soil age.
The model is suitable for integration with an Earth System Model of Intermediate
Complexity (EMIC). In this setup the geographic variation of weathering rates
and soil state is examined with a present day simulation and the result evaluated. |
|
|
|
|
|
|