Nutrient gradients in the wadden sea
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Nutrient gradients in the Wadden Sea. Götz Flöser, GKSS Research Centre TMAP-Workshop, Hamburg, 29.11.2004. Monitoring in the North Sea. Measuring stations in Niedersachsen not near the mainland. Nutrient budget? Philippart & Cadée, 2000.

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Nutrient gradients in the Wadden Sea

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Nutrient gradients in the Wadden Sea

Götz Flöser, GKSS Research Centre

TMAP-Workshop, Hamburg, 29.11.2004


Monitoring in the North Sea

Measuring stations in Niedersachsen

not near the mainland


Nutrient budget?

Philippart & Cadée, 2000

Western Dutch Wadden Sea: Salinity (Zimmermann, 1976)

July 71

April 72

IJsselmeer influence in Western Dutch Wadden Sea prominent

November 71

June 72


North German Wadden Sea

TRANSWATT

  • The gradients found in Schleswig-Holstein can be attributed to:

  • freshwater input from polders,

  • influence of the Elbe at westerly wind conditions

  • Generally, mixing is the main process (N-S-diagrams)


Cross-shore profiles in the Niedersachsen Wadden Sea

In Niedersachsen, there is no permanent freshwater source!


DIN-Profil

µMol/L

  • Conclusion:

  • High concentrations in winter after sluice outlet

  • Concentrations in summer smaller

  • Concentrations in winter homogeneous

  • Strong gradient in summer

Langeoog


µMol/L

Langeoog


Linear y-axis (µmol N/L)


Slope of DIN-curves

Slope of DIP-curves


Nutrient measurements in the Wadden Sea: Correlation with salinity.

  • Two different findings:

  • Winter: mixing of sluice waters with Wadden Sea

  • Sommer: no correlation with salinity


Consequence: winter concentrations of NH4+NO2 double the values near the islands


Nutrient budget: summer

Rain

North Sea

DIN-inventary

Sluices

Inter-basin exchange

Sediment


Nutrient budget: inter-basin exchange is small

Stanev et al., 2003


Sluices: Variability of runoff


Sluices: nutrient concentrations


Exchange with North Sea: Time constant

Exchange constant 3 days


Rain (EMEP):

2 mg/L

Sluices:

only in winter

Inter-basin exchange:

small

North Sea.

3 days exchange

DIN-inventary

Sediment


Export of dissolved nutrients

Conceptual model for nutrient dynamics:


depth function

Theoretical profiles:

Essential assumption: mortality of phytoplankton is depth dependent (filter feeders)

Ebenhöh et al., 2004


What is the essential difference between Niedersachsen and the other two regions??

Can we treat the entire Wadden Sea in the same way?


Thanks for your attention!


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