Ocean, Atmosphere and Biorssource
Océan, Atmosphère et Bioressource
https://www.linkedin.com/groups/14633109/
Océan, Atmosphère et Bioressource
https://www.linkedin.com/groups/14633109/
Time Series Plots:
Show monthly variations in turbulence intensity or wind speed at 120 m a.g.l. Notice the color of the stars on the vertical separate lines for different months (2020). It indicates the turbulence intennsity.
Purpose: Show the frequency of wind speed occurrences over a given period (e.g., monthly or annually).
A wind rose shows the frequency of wind coming from various directions, often combined with speed categories. It helps identify dominant wind directions and their associated speeds.
Sectors: Represent wind directions (e.g., N, NE, E, etc., usually divided into 16 or 32 sectors).
Bars: Indicate the frequency of winds from each direction, scaled as percentages of total measurements.
Colors: Represent wind speed ranges (e.g., 0–2 m/s, 2–4 m/s, etc.).
Inner Circle: Represents calm conditions, often shown as a percentage.
Wind shear is the rate of change of wind speed (and sometimes direction) with height, often expressed mathematically as: u(z)=[u_*/k] x [ln(z/z_0)]
Where:
u(z): Wind speed at height z.
u_*: Friction velocity.
k: von Kármán constant (≈0.4\approx 0.4≈0.4).
z_0: Surface roughness length.
wind shear plays a significant role in explaining the stress at the atmosphere-ocean interface. The interaction between atmospheric winds and the ocean surface generates wind stress, which is critical for driving ocean currents, waves, and mixing processes.