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[ferret_users] Z=@din and z=@ddf
- To: ferret_users@xxxxxxxx
- Subject: [ferret_users] Z=@din and z=@ddf
- From: yangxing zheng <yangxingz@xxxxxxxxx>
- Date: Thu, 08 May 2008 11:12:10 -0700 (PDT)
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- Sender: owner-ferret_users@xxxxxxxx
Hi ferreters,
Today I do have a short question to ask. Probably
it is easy to others. I have an ocean data which
includes vertical velocity W as a function a depth.
The vertical axis is defined as a depth, which means
downward is positive direction. My question is:
What is the physical meaning if I integrate w
along vertical coordinate, w[z=0:300@din], it means
integrate from surface (0) to 300 meter depth, right?
The value of w[z=0:300@din] is the minus of that with
reverse integral direction?
Similar question is the difference between
w[z=0:300@ddf] and that with reverse direction.
For example:
depth (m) W value (cm/s)
0 0.000
10 0.007
20 0.008
30 0.011
then w[z=0:30@ddf] in ferret is calculated in this
way?
at surface: (w2 - w1)/(z2-z1)= (0.007 -
0.000)/(10 - 0)
at 10m depth: = (0.008 - 0.007)/(20 -10)
They take z coordinate value is always positive
in the ocean interior if it is defined with /depth?
Thanks
Y.Z
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