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| Titel |
Calibration and validation of a one-dimensional complex marine biogeochemical flux model in different areas of the northern Adriatic shelf |
| VerfasserIn |
M. Vichi, P. Oddo, M. Zavatarelli, A. Coluccelli, G. Coppini, M. Celio, S. Fonda Umani, N. Pinardi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 21, no. 1 ; Nr. 21, no. 1, S.413-436 |
| Datensatznummer |
250014566
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| Publikation (Nr.) |
 copernicus.org/angeo-21-413-2003.pdf |
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| Zusammenfassung |
| In this paper we show
results from numerical simulations carried out with a complex biogeochemical
fluxes model coupled with a one-dimensional high-resolution hydrodynamical
model and implemented at three different locations of the northern Adriatic
shelf. One location is directly affected by the Po River influence, one has
more open-sea characteristics and one is located in the Gulf of Trieste with an
intermediate behavior; emphasis is put on the comparison with observations and
on the functioning of the northern Adriatic ecosystem in the three areas. The
work has been performed in a climatological context and has to be considered as
preliminary to the development of three-dimensional numerical simulations.
Biogeochemical model parameterizations have been ameliorated with a detailed
description of bacterial substrate utilization associated with the quality of
the dissolved organic matter (DOM), in order to improve the models capability
in capturing the observed DOM dynamics in the basin. The coupled model has been
calibrated and validated at the three locations by means of climatological data
sets. Results show satisfactory model behavior in simulating local seasonal
dynamics in the limit of the available boundary conditions and the
one-dimensional implementation. Comparisons with available measurements of
primary and bacterial production and bacterial abundances have been performed
in all locations. Model simulated rates and bacterial dynamics are in the same
order of magnitude of observations and show a qualitatively correct time
evolution. The importance of temperature as a factor controlling bacteria
efficiency is investigated with sensitivity experiments on the model
parameterizations.
The different model behavior and pelagic ecosystem structure
developed by the model at the three locations can be attributed to the local
hydrodynamical features and interactions with external inputs of nutrients. The
onset of the winter/spring bloom in the climatological simulations is primarily
driven by local stratification conditions. During summer the major
carbon-transfer pathway developed by the model is the microbial web at all the
sites, indicating that a large fraction of organic matter is processed through
bacteria during productive periods, as suggested by field observations. The
site directly influenced by riverine inputs differs from the others, showing a
more alternate shifting among trophic pathways. Applying the conceptual scheme
proposed by Legendre and Rassoulzadegan (Ophelia, 41, 153-172, 1995), it can be
recognized as a herbivorous spring phase tightly followed by a microbial loop
development, a summer microbial web phase and a multivorous trophic web pattern
during autumn with a subsequent recovery of microbial processes. Results are
discussed in terms of regime shifting from transient to stable water column
conditions.
Key words. Oceanography: general
(continental shelf processes; numerical modelling) – Oceanography: biological
and chemical (biochemistry and food chains) |
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