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| Titel |
Interannual variability of alongshore spring bloom dynamics in a coastal sea caused by the differential influence of hydrodynamics and light climate |
| VerfasserIn |
G. Brandt, K. W. Wirtz |
| 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 ; 7, no. 1 ; Nr. 7, no. 1 (2010-01-29), S.371-386 |
| Datensatznummer |
250004388
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| Publikation (Nr.) |
 copernicus.org/bg-7-371-2010.pdf |
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| Zusammenfassung |
| Timing and spatial distribution of phytoplankton blooms in coastal oceans are
highly variable.
The interactions of various biological and physical factors leading to the observed
variability are complex and remain poorly understood.
We present an example for distinct differences in the spatio-temporal chlorophyll a
(CHL-a) distribution on an interannual scale, integrating high-frequency data from an
autonomous measuring device (FerryBox), which operated on an alongshore route in the
coastal German Bight (North Sea).
While in one year the distribution of CHL-a was spatially homogeneous (2004), a bloom only
developed in one part of the transect in the following spring period (2005).
We use a one-dimensional Lagrangian particle tracking model, which operates along the
mean current direction, combined with a NPZ-model to identify the mechanisms controlling
the observed interannual bloom variability on the alongshore transect.
Our results clearly indicate that in 2004 the local light climate determined the spatial
and temporal dynamics of the spring bloom.
In contrast, the import of a water mass with elevated CHL-a concentrations from the
adjacent Southern Bight triggered the spring bloom in 2005.
The inflow event did, however, not last long enough to spread the bloom into the eastern
part of the study area, where high turbidity prevented local phytoplankton growth.
The model identifies two interacting mechanisms, light climate and hydrodynamics, that
controlled the alongshore dynamics.
Especially the occurrence of a pronounced spring bloom despite unfavourable light
conditions in 2005 underlines the need to carefully consider hydrodynamics to
understand the dynamics of the plankton community in coastal environments. |
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