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| Titel |
A generic biogeochemical module for Earth system models: Next Generation BioGeoChemical Module (NGBGC), version 1.0 |
| VerfasserIn |
Y. Fang, M. Huang, C. Liu, H. Li, L. R. Leung |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 6, no. 6 ; Nr. 6, no. 6 (2013-11-13), S.1977-1988 |
| Datensatznummer |
250085016
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| Publikation (Nr.) |
 copernicus.org/gmd-6-1977-2013.pdf |
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| Zusammenfassung |
| Physical and biogeochemical processes regulate soil carbon dynamics and
CO2 flux to and from the atmosphere, influencing global climate
changes. Integration of these processes into Earth system models (e.g.,
community land models (CLMs)), however, currently faces three major
challenges: (1) extensive efforts are required to modify modeling structures
and to rewrite computer programs to incorporate new or updated processes as
new knowledge is being generated, (2) computational cost is prohibitively
expensive to simulate biogeochemical processes in land models due to large
variations in the rates of biogeochemical processes, and (3) various
mathematical representations of biogeochemical processes exist to
incorporate different aspects of fundamental mechanisms, but systematic
evaluation of the different mathematical representations is difficult, if
not impossible. To address these challenges, we propose a new computational
framework to easily incorporate physical and biogeochemical processes into
land models. The new framework consists of a new biogeochemical module, Next
Generation BioGeoChemical Module (NGBGC), version 1.0, with a generic
algorithm and reaction database so that new and updated processes can be
incorporated into land models without the need to manually set up the
ordinary differential equations to be solved numerically. The reaction
database consists of processes of nutrient flow through the terrestrial
ecosystems in plants, litter, and soil. This framework facilitates effective
comparison studies of biogeochemical cycles in an ecosystem using different
conceptual models under the same land modeling framework. The approach was
first implemented in CLM and benchmarked against simulations from the
original CLM-CN code. A case study was then provided to demonstrate the
advantages of using the new approach to incorporate a phosphorus cycle into CLM. To our knowledge, the phosphorus-incorporated CLM is a new
model that can be used to simulate phosphorus limitation on the productivity
of terrestrial ecosystems. The method presented here could in theory be
applied to simulate biogeochemical cycles in other Earth system models. |
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