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| Titel |
Estimation of positive sum-to-one constrained zooplankton grazing preferences with the DEnKF: a twin experiment |
| VerfasserIn |
E. Simon, A. Samuelsen, L. Bertino, D. Dumont |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 8, no. 4 ; Nr. 8, no. 4 (2012-08-08), S.587-602 |
| Datensatznummer |
250005752
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| Publikation (Nr.) |
 copernicus.org/os-8-587-2012.pdf |
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| Zusammenfassung |
| We consider the estimation of the grazing preferences parameters of
zooplankton in ocean ecosystem models with ensemble-based Kalman filters.
These parameters are introduced to model the relative diet composition of
zooplankton that consists of phytoplankton, small size-classes of zooplankton
and detritus. They are positive values and their sum is equal to one.
However, the sum-to-one constraint cannot be guaranteed by ensemble-based
Kalman filters when parameters are bounded. Therefore, a reformulation of the
parameterization is proposed. We investigate two types of variable
transformations for the estimation of positive sum-to-one constrained
parameters that lead to the estimation of a new set of parameters with normal
or bounded distributions. These transformations are illustrated and discussed
with twin experiments performed with the 1-D coupled model GOTM-NORWECOM with
Gaussian anamorphosis extensions of the deterministic ensemble Kalman filter
(DEnKF). |
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