Eastward (u) and northward (v) wind component

Performs a variable conversion from wind speed and direction to the eastward (u) and northward (v) wind component.

Transform: ["WindComponents"]

obs filters:
- filter: Variables Transform
Transform: ["WindComponents"]

Observation parameters needed (JEDI name)

  • wind_speed (\(V_{s}\))

  • wind_from_direction (\(V_{d}\))

Method(s) available

Only one method is avalable, shared accross all center options. (Any setting of METHOD will result in using this unique method.) Setting METHOD can be omitted.

The eastward (\(u\)) and northward (\(v\)) wind component are derived as follow:

\[ \begin{align}\begin{aligned}u = -V_{s} \times sin(V_{d} \times \frac{\pi}{180})\\v = -V_{s} \times cos(V_{d} \times \frac{\pi}{180})\end{aligned}\end{align} \]

Formulation(s) available

None

Wind speed and direction

Performs a variable conversion from eastward (u) and northward (v) wind components to wind speed and direction.

Transform: ["WindSpeedAndDirection"]

obs filters:
- filter: Variables Transform
Transform: ["WindSpeedAndDirection"]

Observation parameters needed (JEDI name)

  • eastward_wind (\(u\))

  • northward_wind (\(v\))

Method(s) available

Only one method is avalable, shared accross all center options. (Any setting of METHOD will result in using this unique method.) Setting METHOD can be omitted.

The wind speed (\(V_{s}\)) and direction (\(V_{d}\)) are derived as follows:

\[ \begin{align}\begin{aligned}V_{s} = \sqrt{u^{2}+v^{2}}\\V_{d} = \mod((270.0 - \arctan(v, u) \times \frac{\pi}{180}), \frac{\pi}{180})\end{aligned}\end{align} \]

Formulation(s) available

None