UM Wiki Pages | Main / Um Analysis

June 14, 2007, at 09:58 AM by John -

Changed lines 5-8 from:

Note that this remark is not package-specific. The output data on pressure levels cannot be used straight away. The surface pressure changes every timestep and ~~therefore pressure can be undefined at times. To account for~~ the fraction of the time
that a certain pressure level is defined, it is needed to divide the variables on pressure ~~levels (e.g. temperature~~, humidity, ..)
by the variable [@HEAVYSIDE FN ON P LEV/UV GRID@] (STASH code 30301).

to:

Note that this remark is not package-specific. The output data on pressure levels cannot be used straight away. The surface pressure changes every timestep and if it is lower than a certain pressure level, the data on this level is undefined. To account for the fraction of the time that a certain pressure level is defined, it is needed to divide the variables on pressure levels (e.g. temperature, humidity, ..) by the variable [@HEAVYSIDE FN ON P LEV/UV GRID@] (STASH code 30301).

June 14, 2007, at 09:57 AM by John -

Changed line 5 from:

Note that this remark is not ~~Ferret~~-specific. The output data on pressure levels cannot be used straight away. The surface pressure changes every timestep and therefore pressure can be undefined at times. To account for the fraction of the time

to:

Note that this remark is not package-specific. The output data on pressure levels cannot be used straight away. The surface pressure changes every timestep and therefore pressure can be undefined at times. To account for the fraction of the time

June 04, 2007, at 08:09 AM by John -

Changed lines 1-2 from:

This ~~package~~ describes how to analyse the UM with different packages.

to:

This page describes how to analyse the UM with different packages.

!General comments
!!Atmosphere data on pressure levels
Note that this remark is not Ferret-specific. The output data on pressure levels cannot be used straight away. The surface pressure changes every timestep and therefore pressure can be undefined at times. To account for the fraction of the time
that a certain pressure level is defined, it is needed to divide the variables on pressure levels (e.g. temperature, humidity, ..)
by the variable [@HEAVYSIDE FN ON P LEV/UV GRID@] (STASH code 30301).

Changed lines 34-37 from:

!!Atmosphere data on pressure levels
Note that this remark is not Ferret-specific. The output data on pressure levels cannot be used straight away. ~~The surface pressure changes every timestep and therefore pressure can be undefined at times~~. ~~To account for the fraction of the~~ time
~~that a certain pressure level is defined, it is needed to divide the variables on pressure levels (e.g. temperature, humidity,~~ ..)
by the variable [@HEAVYSIDE FN ON P LEV/UV GRID@] (STASH code 30301).

to:

!!Combining output
Model output files usually contain 1 or a small number of time steps, while for analysis many timesteps are needed. Ferret can access data from multiple files transparently through the use of descriptor files. The script [[make_des_time->http:/www.met.rdg.ac.uk/~donners/make_des_time]] automatically generates a descriptor file for a list of UM output files in NetCDF format with the correct time axis. The script will produce an incorrect descriptor file if the variables in the output files use different time axes. Also, the first line needs to point to the [@ksh@] on your local system.

June 04, 2007, at 06:50 AM by John -

Changed lines 4-5 from:

[[Ferret->http://ferret.wrc.noaa.gov]]is an analysis package specifically designed for atmospheric and oceanic data. It supports 4-dimensional (xyzt) datasets in the NetCDF format.

to:

[[Ferret->http://ferret.wrc.noaa.gov]] is an analysis package specifically designed for atmospheric and oceanic data. It supports 4-dimensional (xyzt) datasets in the NetCDF format.

June 04, 2007, at 06:50 AM by John -

Changed lines 4-5 from:

[[Ferret->http://ferret.wrc.noaa.gov]] is an analysis package specifically designed for atmospheric and oceanic data. It supports 4-dimensional (xyzt) datasets in the NetCDF format.

to:

[[Ferret->http://ferret.wrc.noaa.gov]]is an analysis package specifically designed for atmospheric and oceanic data. It supports 4-dimensional (xyzt) datasets in the NetCDF format.

June 04, 2007, at 06:50 AM by John -

Changed lines 4-5 from:

[[Ferret -> http://ferret.wrc.noaa.gov]] is an analysis package specifically designed for atmospheric and oceanic data. It supports 4-dimensional (xyzt) datasets in the NetCDF format.

to:

[[Ferret->http://ferret.wrc.noaa.gov]] is an analysis package specifically designed for atmospheric and oceanic data. It supports 4-dimensional (xyzt) datasets in the NetCDF format.

June 04, 2007, at 06:48 AM by John -

Added line 6:

!!Ocean data on depth levels

Changed lines 26-31 from:

@]

to:

@]

!!Atmosphere data on pressure levels
Note that this remark is not Ferret-specific. The output data on pressure levels cannot be used straight away. The surface pressure changes every timestep and therefore pressure can be undefined at times. To account for the fraction of the time
that a certain pressure level is defined, it is needed to divide the variables on pressure levels (e.g. temperature, humidity, ..)
by the variable [@HEAVYSIDE FN ON P LEV/UV GRID@] (STASH code 30301).

June 04, 2007, at 06:39 AM by John -

Added line 8:

[@

Changed lines 10-13 from:

110,120,130,141.2,155.8,176.1,204.4,242.8,293.4,358.2,439,\
537.5,655.3,793.7,954,1137.2,1344.2,1575.6,1831.8,2113,2418.6,\
2744.9,3085,3430,3775,4120,4465,4810,5155,5500}

to:

   110,120,130,141.2,155.8,176.1,204.4,242.8,293.4,358.2,439,\
   537.5,655.3,793.7,954,1137.2,1344.2,1575.6,1831.8,2113,2418.6,\
   2744.9,3085,3430,3775,4120,4465,4810,5155,5500}
@]

Added line 19:

[@

Changed lines 21-24 from:

30.45,40.75,51.18,61.8,72.69,83.97,95.81,108.44,122.22,137.62,155.32,176.27,\
201.77,233.55,273.87,325.56,391.96,476.68,583.2,714.29,871.46,1054.56,1261.85,\
1490.4,1736.67,1997.07,2268.33,2547.73,2833.09,3122.75,3415.48,3710.39,4006.83,\
4304.35,4602.62,4901.41,5200.57,5499.99}

to:

   30.45,40.75,51.18,61.8,72.69,83.97,95.81,108.44,122.22,137.62,155.32,176.27,\
   201.77,233.55,273.87,325.56,391.96,476.68,583.2,714.29,871.46,1054.56,1261.85,\
   1490.4,1736.67,1997.07,2268.33,2547.73,2833.09,3122.75,3415.48,3710.39,4006.83,\
   4304.35,4602.62,4901.41,5200.57,5499.99}
@]

June 04, 2007, at 06:31 AM by John -

Changed lines 8-9 from:

define axis/edges/z/depth/units=m `TEMP,ret=zaxis`={0,10,20,30,40,50,60,70,80,90,100, 110,120,130,141.2,155.8,176.1,204.4,242.8,293.4,358.2,439, 537.5,655.3,793.7,954,1137.2,1344.2,1575.6,1831.8,2113,2418.6, 2744.9,3085,3430,3775,4120,4465,4810,5155,5500}

to:

define axis/edges/z/depth/units=m `TEMP,ret=zaxis`={0,10,20,30,40,50,60,70,80,90,100,\
110,120,130,141.2,155.8,176.1,204.4,242.8,293.4,358.2,439,\
537.5,655.3,793.7,954,1137.2,1344.2,1575.6,1831.8,2113,2418.6,\
2744.9,3085,3430,3775,4120,4465,4810,5155,5500}

Changed lines 17-21 from:

define axis/edges/z/depth/units=m `TEMP,ret=zaxis`={0,10.1,20.24, 30.45,40.75,51.18,61.8,72.69,83.97,95.81,108.44,122.22,137.62,155.32,176.27, 201.77,233.55,273.87,325.56,391.96,476.68,583.2,714.29,871.46,1054.56,1261.85, 1490.4,1736.67,1997.07,2268.33,2547.73,2833.09,3122.75,3415.48,3710.39,4006.83, 4304.35,4602.62,4901.41,5200.57,5499.99}

to:

define axis/edges/z/depth/units=m `TEMP,ret=zaxis`={0,10.1,20.24,\
30.45,40.75,51.18,61.8,72.69,83.97,95.81,108.44,122.22,137.62,155.32,176.27,\
201.77,233.55,273.87,325.56,391.96,476.68,583.2,714.29,871.46,1054.56,1261.85,\
1490.4,1736.67,1997.07,2268.33,2547.73,2833.09,3122.75,3415.48,3710.39,4006.83,\
4304.35,4602.62,4901.41,5200.57,5499.99}

June 04, 2007, at 06:29 AM by John -

Changed lines 4-5 from:

~~Ferret~~[[http://ferret.wrc.noaa.gov]] is an analysis package specifically designed for atmospheric and oceanic data. It supports 4-dimensional (xyzt) datasets in the NetCDF format.

to:

[[Ferret -> http://ferret.wrc.noaa.gov]] is an analysis package specifically designed for atmospheric and oceanic data. It supports 4-dimensional (xyzt) datasets in the NetCDF format.

Changed lines 8-11 from:

define axis/edges/z/depth/units=m `TEMP,ret=zaxis`={0,10,20,30,40,50,60,70,80,90,100,1
10,120,130,141.2,155.8,176.1,204.4,242.8,293.4,358.2,439,537.5,655.3,793.7,954,1137.2,1344.2,1575.6
,1831.8,2113,2418.6,2744.9,3085,3430,3775,4120,4465,4810,5155,5500}

to:

define axis/edges/z/depth/units=m `TEMP,ret=zaxis`={0,10,20,30,40,50,60,70,80,90,100, 110,120,130,141.2,155.8,176.1,204.4,242.8,293.4,358.2,439, 537.5,655.3,793.7,954,1137.2,1344.2,1575.6,1831.8,2113,2418.6, 2744.9,3085,3430,3775,4120,4465,4810,5155,5500}

Changed lines 14-17 from:

define axis/edges/z/depth/units=m `TEMP,ret=zaxis`={0,10.1,20.24,30.45,40.75,51.18,61.
8,72.69,83.97,95.81,108.44,122.22,137.62,155.32,176.27,201.77,233.55,273.87,325.56,391.96,476.68,58
3.2,714.29,871.46,1054.56,1261.85,1490.4,1736.67,1997.07,2268.33,2547.73,2833.09,3122.75,3415.48,37
10.39,4006.83,4304.35,4602.62,4901.41,5200.57,5499.99}

to:

define axis/edges/z/depth/units=m `TEMP,ret=zaxis`={0,10.1,20.24, 30.45,40.75,51.18,61.8,72.69,83.97,95.81,108.44,122.22,137.62,155.32,176.27, 201.77,233.55,273.87,325.56,391.96,476.68,583.2,714.29,871.46,1054.56,1261.85, 1490.4,1736.67,1997.07,2268.33,2547.73,2833.09,3122.75,3415.48,3710.39,4006.83, 4304.35,4602.62,4901.41,5200.57,5499.99}

June 04, 2007, at 06:27 AM by John - Ferret info

Added lines 1-19:

This package describes how to analyse the UM with different packages.

!Ferret
Ferret[[http://ferret.wrc.noaa.gov]] is an analysis package specifically designed for atmospheric and oceanic data. It supports 4-dimensional (xyzt) datasets in the NetCDF format.

Ferret incorrectly interprets the depth levels of oceanic data that has been converted from the model output data with Xconv or convsh. The depth levels of the z-axis therefore need to be replaced manually. The following command replaces the depth levels for standard HadGOM with 38 levels:

define axis/edges/z/depth/units=m `TEMP,ret=zaxis`={0,10,20,30,40,50,60,70,80,90,100,1
10,120,130,141.2,155.8,176.1,204.4,242.8,293.4,358.2,439,537.5,655.3,793.7,954,1137.2,1344.2,1575.6
,1831.8,2113,2418.6,2744.9,3085,3430,3775,4120,4465,4810,5155,5500}

where the variable TEMP can be any oceanic variable on depth levels except the vertical velocity.

The HiGOM ocean model is the ocean component of the [[HiGEM -> http://www.higem.nerc.ac.uk]] model, uses the same number of levels, but located at different depths:

define axis/edges/z/depth/units=m `TEMP,ret=zaxis`={0,10.1,20.24,30.45,40.75,51.18,61.
8,72.69,83.97,95.81,108.44,122.22,137.62,155.32,176.27,201.77,233.55,273.87,325.56,391.96,476.68,58
3.2,714.29,871.46,1054.56,1261.85,1490.4,1736.67,1997.07,2268.33,2547.73,2833.09,3122.75,3415.48,37
10.39,4006.83,4304.35,4602.62,4901.41,5200.57,5499.99}

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