If the wind speed is recorded at 1.5 m/s at 10 m height, what would it be at 2 m height under D stability conditions?

Under D stability conditions, the atmosphere is relatively unstable, which means that there is typically less vertical mixing and weaker wind speeds close to the surface compared to those at greater heights. With the wind speed measured at 1.5 m/s at a height of 10 m, it is reasonable to conclude that as you move to a lower height of 2 m, the wind speed will decrease.

This decrease can be attributed to the effects of surface roughness and various atmospheric phenomena that dampen wind speed near the ground level. In stable conditions, we often see increased wind speed at lower heights due to enhanced mixing, but under D stability, that mixing is not as pronounced. As a result, it is expected that the wind speed at 2 m height will be less than the wind speed measured at 10 m.

Thus, identifying the wind speed at a lower height, particularly under the specified stability condition, leads us to conclude that it will indeed be less than 1.5 m/s.