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| Titel |
Control of phytoplankton production by physical forcing in a strongly tidal, well-mixed estuary |
| VerfasserIn |
X. Desmit, J. P. Vanderborght, P. Regnier, R. Wollast |
| 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 ; 2, no. 2 ; Nr. 2, no. 2 (2005-08-04), S.205-218 |
| Datensatznummer |
250000493
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| Publikation (Nr.) |
 copernicus.org/bg-2-205-2005.pdf |
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| Zusammenfassung |
| A zero-dimensional model for phytoplanktonic production in turbid,
macro-tidal, well-mixed estuaries is proposed. It is based on the
description of light-dependent algal growth, phytoplankton respiration and
mortality. The model is forced by simple time-functions for solar
irradiance, water depth and light penetration. The extinction coefficient is
directly related to the dynamics of suspended particulate matter. Model
results show that the description of phytoplankton growth must operate at a
time resolution sufficiently high to describe the interference between
solarly and tidally driven physical forcing functions. They also demonstrate
that in shallow to moderately deep systems, simulations using averaged,
instead of time-varying, forcing functions lead to significant errors in the
estimation of phytoplankton productivity. The highest errors are observed
when the temporal pattern of light penetration, linked to the tidal cycle of
solids settling and resuspension, is neglected. The model has also been
applied using realistic forcing functions typical of two locations in the
Scheldt estuary. Model results are consistent with the typical phytoplankton
decay observed along the longitudinal, seaward axis in the tidal river and
oligohaline part of this estuary. |
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