U. Callies et al.: Surface drifters in the inner German Bight 
807 
www.ocean-sci.net/13/799/2017/ 
Ocean Sci., 13, 799-827, 2017 
Observed distances between drifter nos. 6 and 8 
Figure 5. Observed distances between drifter nos. 6 and 8. Colours refer to those specified in Table SI. 
Magnitudes Of drift velocities (25 h moving averages) 
Observations: coloured BSHcmodt-W: Windage in BSHcmod+W: Stokes drift in BSHcmod+S: 
(a)Drifter no. 5, 
0 1 2 3 4 5 6 7 6 9 10 11 12 13 14 15 16 17 16 19 20 £1 22 23 24 25 26 27 26 29 30 31 32 33 34 35 36 37 36 39 40 41 42 43 44 45 46 47 
Days since 2015-05-27 (13.00 UTC) 
Figure 6. Magnitudes of 25 h moving averages of drift velocity vectors, considering drifter nos. 5, 6, 8 and 9. Magnitudes of observed 
velocity vectors (coloured) are compared with simulations based on BSHcmod + W. In addition, magnitudes of windage (in BSHcmod + W) 
and Stokes drift (in BSHcmod + S) are shown. All model values were interpolated to observed (not simulated) drifter locations prior to 
averaging. 
Further details of observed trajectories will be addressed in 
Sect. 3.2 together with a presentation of corresponding sim 
ulations. 
3.2 Simulations 
Figures in the Appendix compare drift simulations based on 
TRIM (Fig. A4) with three different approaches based on 
BSFtcmod. The three setups are (a) just Eulerian currents