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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

Nutrient gradients in the Wadden Sea

Götz Flöser, GKSS Research Centre

TMAP-Workshop, Hamburg, 29.11.2004

slide2

Monitoring in the North Sea

Measuring stations in Niedersachsen

not near the mainland

slide3

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

slide4

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)
slide5

Cross-shore profiles in the Niedersachsen Wadden Sea

In Niedersachsen, there is no permanent freshwater source!

slide6

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

slide7

µMol/L

Langeoog

slide9

Slope of DIN-curves

Slope of DIP-curves

slide10

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
slide12

Nutrient budget: summer

Rain

North Sea

DIN-inventary

Sluices

Inter-basin exchange

Sediment

slide17

Rain (EMEP):

2 mg/L

Sluices:

only in winter

Inter-basin exchange:

small

North Sea.

3 days exchange

DIN-inventary

Sediment

slide18

Export of dissolved nutrients

Conceptual model for nutrient dynamics:

slide19

depth function

Theoretical profiles:

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

Ebenhöh et al., 2004

slide20

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

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

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