Size‐resolved measurements of cloud droplet deposition velocity to a forest canopy using an eddy correlation technique

The case studies were conducted in different weather conditions: case 1 with high values of liquid water content (typically 0.3 g m-3) and low wind speeds (2-3 m s-1), and case 2 with low liquid water content (0.1 g m-3) and higher wind speeds (typically 6 m s-1). In both cases the deposition velocity for liquid water was markedly less than for momentum. For case study 2 the cause of the small deposition velocity for liquid water was the small droplet size; the typical modal radius was 4.4 μm. The deposition velocity increased as a function of droplet size, exceeding that for momentum for droplets larger than about 6 μm. When normalized, the results agreed reasonably well with those obtained over grassland using the gradient technique. -from Authors