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| Titel |
SHIMMER (1.0): a novel mathematical model for microbial and biogeochemical dynamics in glacier forefield ecosystems |
| VerfasserIn |
J. A. Bradley, A. M. Anesio, J. S. Singarayer, M. R. Heath, S. Arndt |
| 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 ; 8, no. 10 ; Nr. 8, no. 10 (2015-10-28), S.3441-3470 |
| Datensatznummer |
250116616
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| Publikation (Nr.) |
 copernicus.org/gmd-8-3441-2015.pdf |
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| Zusammenfassung |
| SHIMMER (Soil biogeocHemIcal Model for Microbial Ecosystem Response) is a new numerical modelling framework designed
to simulate microbial dynamics and biogeochemical cycling during initial
ecosystem development in glacier forefield soils. However, it is also
transferable to other extreme ecosystem types (such as desert soils or the
surface of glaciers). The rationale for model development arises from
decades of empirical observations in glacier forefields, and enables a
quantitative and process focussed approach. Here, we provide a detailed
description of SHIMMER, test its performance in two case study forefields:
the Damma Glacier (Switzerland) and the Athabasca Glacier (Canada) and
analyse sensitivity to identify the most sensitive and unconstrained model
parameters. Results show that the accumulation of microbial biomass is
highly dependent on variation in microbial growth and death rate constants,
Q10 values, the active fraction of microbial biomass and the reactivity
of organic matter. The model correctly predicts the rapid accumulation of
microbial biomass observed during the initial stages of succession in the
forefields of both the case study systems. Primary production is responsible
for the initial build-up of labile substrate that subsequently supports
heterotrophic growth. However, allochthonous contributions of organic
matter, and nitrogen fixation, are important in sustaining this
productivity. The development and application of SHIMMER also highlights
aspects of these systems that require further empirical research:
quantifying nutrient budgets and biogeochemical rates, exploring
seasonality and microbial growth and cell death. This will lead to
increased understanding of how glacier forefields contribute to global
biogeochemical cycling and climate under future ice retreat. |
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