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| Titel |
The effect of vertically resolved soil biogeochemistry and alternate soil C and N models on C dynamics of CLM4 |
| VerfasserIn |
C. D. Koven, W. J. Riley, Z. M. Subin, J. Y. Tang, M. S. Torn, W. D. Collins, G. B. Bonan, D. M. Lawrence, S. C. Swenson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 11 ; Nr. 10, no. 11 (2013-11-10), S.7109-7131 |
| Datensatznummer |
250085403
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| Publikation (Nr.) |
 copernicus.org/bg-10-7109-2013.pdf |
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| Zusammenfassung |
| Soils are a crucial component of the Earth system; they comprise a large
portion of terrestrial carbon stocks, mediate the supply and demand of
nutrients, and influence the overall response of terrestrial ecosystems to
perturbations. In this paper, we develop a new soil biogeochemistry model for
the Community Land Model, version 4 (CLM4). The new model includes a vertical
dimension to carbon (C) and nitrogen (N) pools and transformations, a more
realistic treatment of mineral N pools, flexible treatment of the dynamics of
decomposing carbon, and a radiocarbon (14C) tracer. We describe the
model structure, compare it with site-level and global
observations, and discuss the overall
effect of the revised soil model on Community Land Model (CLM) carbon
dynamics. Site-level comparisons to radiocarbon and bulk soil C observations
support the idea that soil C turnover is reduced at depth beyond what is
expected from environmental controls for temperature, moisture, and oxygen
that are considered in the model. In better agreement with observations, the
revised soil model predicts substantially more and older soil C, particularly
at high latitudes, where it resolves a permafrost soil C pool. In addition,
the 20th century-C dynamics of the model are more realistic than those of the
baseline model, with more terrestrial C uptake over the 20th century due to
reduced N downregulation and longer turnover times for decomposing C. |
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