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Daily circulation pattern German Bight

   
 
 

Annotation of method

Daily circulation pattern:

The near-surface circulation pattern in the German Bight are permanently changing due to strong tidal currents and the variability of the local wind field. The net transport of the water mass is defined by the so-called residual currents, i.e., the influence of the tidal currents is eliminated by suitable averaging. The circulation calendars document the direction of the daily residual currents and reveal the high directional variability in the German Bight. Longer periods of constant circulation pattern are caused by persistent wind fields. Generally, the circulation pattern are characterised by a great seasonal and inter-annual variability.
Abbildung der typischen Zirkulationsmuster in der Deutschen Bucht Daily averaged residual currents of the upper model layer (0 - 5 m depth) of the BSH’s operational circulation model BSHcmod version 4 are used to classify the circulation pattern in the German Bight between 53° 15’ - 55° 30’ N and 6° 30’ - 9° E. The data are daily averages which corresponds to about 2 tidal periods. The small averaging error is negligible concerning the distribution of the circulation pattern. The most frequent pattern are the cyclonic circulation (C, ~45%) with a pronounced inflow at the south-western border and outflow at the northern border, the opposite directed anticyclonic circulation (A, ~ 13%), and a variable current pattern (V, ~24%). The six directional types with currents towards the E, W, N, S, NW, and SE play only a minor role. For seasonal statistics these patterns are combined in the directional type (DIR = E+W+N+S+NW+SE ). Due to the topographical forcing SW and NE pattern are not observed.

Circulation pattern
2000 / 2001 / 2002 / 2003 / 2004 / 2005 / 2006 / 2007 / 2008 / 2009 / 2010 / 2011 / 2012 / 2013 / 2014 / 2015 / 2016 / 2017

Seasonal circulation statistics
2000 / 2001 / 2002 / 2003 / 2004 / 2005 / 2006 / 2007 / 2008 / 2009 / 2010 / 2011 / 2012 / 2013 / 2014 / 2015 / 2016

Annual circulation statistics
2009 & 2010 / 2010 & 2011 / 2011 & 2012 / 2012 & 2013 / 2013 & 2014 / 2014 & 2015 / 2015 & 2016

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If you have any additional questions or data requests, please
e-mail Holger Klein or phone +49 40 3190 - 3220

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 © 2017 Bundesamt für Seeschifffahrt und Hydrographie Last Update: 21.02.2017 08:53:27  
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