Influence of Particle Mixing on Vertical Profiles of Chlorophyll and Bacterial Biomass in Sediments of the German Bight, Oyster Ground and Dogger Bank (North Sea)

2001 ◽  
Vol 52 (6) ◽  
pp. 783-795 ◽  
Author(s):  
T. Stoeck ◽  
I. Kröncke
Keyword(s):  
North Sea ◽  
German Bight ◽  
Bacterial Biomass ◽  
Vertical Profiles ◽  
Dogger Bank ◽  
Particle Mixing ◽  
Oyster Ground

Seasonal variability of epibenthic communities in different areas of the southern North Sea

2004 ◽  
Vol 61 (6) ◽  
pp. 882-905 ◽  
Author(s):  
Henning Reiss ◽  
Ingrid Kröncke
Keyword(s):  
North Sea ◽  
German Bight ◽  
Seasonal Variability ◽  
Fishing Effort ◽  
Spatial And Temporal Patterns ◽  
Dogger Bank ◽  
Oyster Ground ◽  
Pagurus Bernhardus ◽  
Study Sites ◽  
Epibenthic Communities

Abstract Between November 2000 and May 2002, epibenthos was sampled monthly with a 2-m beam trawl at three stations along a transect from the southern German Bight towards the northeastern part of the Dogger Bank (North Sea) in order to investigate the seasonal variability of the epibenthic communities. The stations were chosen to reflect a gradient in the hydrigraphic regime, organic matter supply, and fishing effort. The epibenthic community of the southern German Bight was characterized by high biomass and abundance, dominated by Asterias rubens and Ophiura albida. In contrast, at the northern stations in the Oyster Ground and at the Dogger Bank, epibenthic biomass and abundance were substantially lower and the dominant species were mainly crustaceans such as Corystes cassivelaunus, Liocarcinus holsatus, and Pagurus bernhardus. In terms of seasonal variability, mean abundance and biomass in the southern German Bight showed highest values in the summer months and lowest values in the winter months. A similar pattern, but less distinct, was observed in the Oyster Ground. But at the Dogger Bank the pattern was different, with highest abundance and biomass values in the winter months. The differences in spatial and temporal patterns are discussed in relation to differences in temperature, thermal stratification and fishing effort at the three study sites.

scholarly journals The Marine Radiocarbon Bomb Pulse Across the Temperate North Atlantic: A Compilation of Δ14C Time Histories fromArctica IslandicaGrowth Increments

Radiocarbon ◽  
2012 ◽  
Vol 54 (2) ◽  
pp. 165-186 ◽  
Author(s):  
James D Scourse ◽  
Alan D Wanamaker ◽  
Chris Weidman ◽  
Jan Heinemeier ◽  
Paula J Reimer ◽  
...  
Keyword(s):  
North Sea ◽  
Marine Environment ◽  
Mixed Layer ◽  
North Atlantic ◽  
German Bight ◽  
Freshwater Flux ◽  
Arctica Islandica ◽  
Oyster Ground ◽  
Time Histories ◽  
Carbon Reservoir

Marine radiocarbon bomb-pulse time histories of annually resolved archives from temperate regions have been underexploited. We present here series of Δ14C excess from known-age annual increments of the long-lived bivalve molluskArctica islandicafrom 4 sites across the coastal North Atlantic (German Bight, North Sea; Troms⊘, north Norway; Siglufjordur, north Icelandic shelf; Grimsey, north Icelandic shelf) combined with published series from Georges Bank and Sable Bank (NW Atlantic) and the Oyster Ground (North Sea). The atmospheric bomb pulse is shown to be a step-function whose response in the marine environment is immediate but of smaller amplitude and which has a longer decay time as a result of the much larger marine carbon reservoir. Attenuation is determined by the regional hydrographic setting of the sites, vertical mixing, processes controlling the isotopic exchange of14C at the air-sea boundary,14C content of the freshwater flux, primary productivity, and the residence time of organic matter in the sediment mixed layer. The inventories form a sequence from high magnitude-early peak (German Bight) to low magnitude-late peak (Grimsey). All series show a rapid response to the increase in atmospheric Δ14C excess but a slow response to the subsequent decline resulting from the succession of rapid isotopic air-sea exchange followed by the more gradual isotopic equilibration in the mixed layer due to the variable marine carbon reservoir and incorporation of organic carbon from the sediment mixed layer. The data constitute calibration scries for the use of the bomb pulse as a high-resolution dating tool in the marine environment and as a tracer of coastal ocean water masses.

Seasonal lipid dynamics of the shrimps Crangon crangon and Pandalus montagui in the German Bight (North Sea)

2019 ◽  
Vol 625 ◽  
pp. 41-52 ◽  
Author(s):  
D Martínez-Alarcón ◽  
R Saborowski ◽  
E Melis ◽  
W Hagen
Keyword(s):  
North Sea ◽  
German Bight ◽  
Crangon Crangon ◽  
Lipid Dynamics

A cadmium budget for the German Bight in the North Sea

1997 ◽  
Vol 34 (6) ◽  
pp. 375-381 ◽  
Author(s):  
G. Radach ◽  
K. Heyer
Keyword(s):  
North Sea ◽  
German Bight ◽  
The North ◽  
The North Sea

Distribution and trophic links of gelatinous zooplankton on Dogger Bank, North Sea

2011 ◽  
Vol 159 (2) ◽  
pp. 239-253 ◽  
Author(s):  
Jessica R. Frost ◽  
Anneke Denda ◽  
Clive J. Fox ◽  
Charles A. Jacoby ◽  
Rolf Koppelmann ◽  
...  
Keyword(s):  
North Sea ◽  
Gelatinous Zooplankton ◽  
Dogger Bank ◽  
Trophic Links

scholarly journals Evaluation of numerical models by FerryBox and fixed platform in situ data in the southern North Sea

Ocean Science ◽  
2015 ◽  
Vol 11 (6) ◽  
pp. 879-896 ◽  
Author(s):  
M. Haller ◽  
F. Janssen ◽  
J. Siddorn ◽  
W. Petersen ◽  
S. Dick
Keyword(s):  
North Sea ◽  
High Frequency ◽  
Numerical Models ◽  
Spatial Scales ◽  
Model Performance ◽  
Eastern Coast ◽  
Southern North Sea ◽  
In Situ Data ◽  
Oyster Ground ◽  
Study Results

Abstract. For understanding and forecasting of hydrodynamics in coastal regions, numerical models have served as an important tool for many years. In order to assess the model performance, we compared simulations to observational data of water temperature and salinity. Observations were available from FerryBox transects in the southern North Sea and, additionally, from a fixed platform of the MARNET network. More detailed analyses have been made at three different stations, located off the English eastern coast, at the Oyster Ground and in the German Bight. FerryBoxes installed on ships of opportunity (SoO) provide high-frequency surface measurements along selected tracks on a regular basis. The results of two operational hydrodynamic models have been evaluated for two different time periods: BSHcmod v4 (January 2009 to April 2012) and FOAM AMM7 NEMO (April 2011 to April 2012). While they adequately simulate temperature, both models underestimate salinity, especially near the coast in the southern North Sea. Statistical errors differ between the two models and between the measured parameters. The root mean square error (RMSE) of water temperatures amounts to 0.72 °C (BSHcmod v4) and 0.44 °C (AMM7), while for salinity the performance of BSHcmod is slightly better (0.68 compared to 1.1). The study results reveal weaknesses in both models, in terms of variability, absolute levels and limited spatial resolution. Simulation of the transition zone between the coasts and the open sea is still a demanding task for operational modelling. Thus, FerryBox data, combined with other observations with differing temporal and spatial scales, can serve as an invaluable tool not only for model evaluation, but also for model optimization by assimilation of such high-frequency observations.

Tools to evaluate seafloor integrity: comparison of multi-device acoustic seafloor classifications for benthic macrofauna-driven patterns in the German Bight, southern North Sea

2016 ◽  
Vol 37 (2) ◽  
pp. 93-109 ◽  
Author(s):  
Peter Holler ◽  
Edith Markert ◽  
Alexander Bartholomä ◽  
Ruggero Capperucci ◽  
H. Christian Hass ◽  
...  
Keyword(s):  
North Sea ◽  
German Bight ◽  
Benthic Macrofauna ◽  
Southern North Sea
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