Analysis 03: Future Scenario—OWF Development Within German EEZ - On the Effect of Offshore Wind Farms on the Atmosphere and Ocean Dynamics - page 138

Fig. 6.17 500 hPa geopotential from 16 to 19 June 2010. Over the 4 days, a long-wave trough
affects the meteorological situation of northern Europe and Germany. Maps are taken from www.
wetterzentrale.de
6.2.1 Effect on the Atmosphere Based on Case Study II
The mean wind direction over the German Bight in 10-m height was NE to
N. Figure 6.18 summarizes the effect of OWFs based on scenario B1-2030much :
The formation of the wind wake is similar to the wind direction case N and NE
described in previous section. The daily means of 10-m wind fields are more or less
equal for day 16th and 17th with wind speeds of 10 m/s. Here, the maximal wind
reduction of 5.35 m/s and an increase of 1.40 m/s occur especially towards coasts.
Only the daily mean of the wind direction slightly varies between those 2 days. On
18th of June 2010, the OWF effect is weaker due to wind speeds of less than 10 m/s
over the German Bight. But on 19 June, the wind reduction counts up to 9.03 m/s.
The 10-m wind speeds on that day simulated in run OWFr are in average 11 m/s.
The wind turbines operate over the whole time of simulation.
The effect of the OWFs on the 10-m temperature field obviously shows the
previously mentioned generally detected cooling of around 0.5 C over ocean.