Definition of UVEL and VVEL in POP

[tienyiah@uci_edu]

I want to know what coordinate system UVEL and VVEL follow.

According to the documentation, the definition of UVEL and VVEL

UVEL​	cm/s​	Zonal Velocity​
VVEL​	cm/s​	Meridional Velocity​

But the definition of UVEL2 and VVEL2

UVEL2​	cm2/s2​	Velocity in grid-x direction​
VVEL2​	cm2/s2​	Velocity in grid-y direction​

Because POP2 use displaced-pole grid, grid-x and grid-y directions are equivalent to eastward and northward directions.
So, are they actually using a different coordinate system? Or I am mistaking something?

 

[tienyiah@uci_edu]

I want to know what coordinate system UVEL and VVEL follow.

According to the documentation, the definition of UVEL and VVEL

UVEL​	cm/s​	Zonal Velocity​
VVEL​	cm/s​	Meridional Velocity​

But the definition of UVEL2 and VVEL2

UVEL2​	cm2/s2​	Velocity in grid-x direction​
VVEL2​	cm2/s2​	Velocity in grid-y direction​

Because POP2 use displaced-pole grid, grid-x and grid-y directions are equivalent to eastward and northward directions.
So, are they actually using a different coordinate system? Or I am mistaking something?

Typo: grid-x and grid-y directions are NOT equivalent to eastward and northward directions.

 

[fredc]

UVEL and VVEL are grid aligned.