Fig. 13
Scatterplots of σw/u* (in 10 min segments) as a function of tower-relative wind direction for five time periods during the MOSAiC year. The horizontal black dashed line is the expected value of 1.25. For each period, the boxes show the points for airflow from the ship (cyan), the tower (black; 2 m and 6 m only), and the Met Hut (black; all levels) towards the respective sonic anemometers. The points for which the airflow is coming from the ship (cyan) and the distance to the ship is less than the calculated turbulent footprint size (see text) are circled in magenta. Values when airflow is from the ship are often elevated, especially for the 10 m height when the ship distance is less than the footprint size. Values for winds from the tower and the met hut are often elevated, but not as consistently and as significantly as from the ship at 10 m height.
