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Introduction
Some users are interested on the wind u/v components at certain height in meters. This Python script will allow you to compute it. The starting point is the geopotential and pressure (z, lnsp) on the surface and temperature and specific humidity on all the model levels. The output will be written in grib format, providing the u and v components of the wind in m s**-1.
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If you are using MARS to retrieve the data, we have prepared a script that will allow you to get the data and then call the Python script automatically. You can set the date, time, step, class, grid resolution, type, area... The script will create and execute the MARS requests to get (t,q,u,v,z,lnsp). You can find more information about the script here compute_wind_speed_height.ksh:
Download
| Python program | compute_wind_speed_height.py |
| Wrapper script | compute_wind_speed_height.ksh |
Examples
This example will compute the u/v components of the wind at 100m on the 2015-10-21 time 00 step 12 operational analysis model levels (137). Below you can see the MARS user documentation request used to retrieve both files. You can set a different class/stream/type for the input data. The gribType and resolution can also be changed. In this case the resolution of the sfc u/v parameters archived are N640. This may change in future cycles.
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