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Ticket Resolution Summary Owner Reporter
#279 fixed vn4.5 Lam ancillarc creation um_support ggxjd
Description

Hi there, I'm wondering how I can make a full set of ancillary files for a new domain for the LAM vn4.5.

Using the NCAS ancillary file service I have obtained fields i can use for the mask, orography, qrclim.smow, sst and ice. However as the files created are for a vn6.1 some files are not suitable for my uses.

I need a qrparm.soil for MOSES 1 and qrparm.veg which are suitable for the version I'm using. Can anyone help me with how to make these? Is there some available algorithm and data from which these fields are calculated?

Cheers Jonny

#2585 fixed vn10.9 vm. Nudging to model analysis output um_support admg26
Description

Hello,

Monsoon 2

All changes have been committed and the suite is not running

Model: UKCA vn10.9 /branches/dev/alisonming/vn10.9_nudging
(note that fcm_make_um > Sources > um_sources currently uses the version in my home directory)

Suite: u-ba153

I have been trying to get nudging to model output working (even though it is not officially supported). Here is what I have done.

1) I ran ~3 years of a clean UM/UKCA vn10.9 stable release (u-ax344) to generate the u, v and theta fields needed. I've used netcdf output every 6 hours on the model grid. This seems to work quite well.

2) I renamed all the netcdf files according to the format expected by the nudging code. The files can be found in

/projects/polar/almin/output/for_nudging/HP*00.GLOUM6.nc

3) In /branches/dev/alisonming/vn10.9_nudging/src/atmosphere/nudging/, I have made a few code changes.

  • The grid resolution is changed in nudging_control.F90
  • The variables u, v and Theta are labelled as follows in the netcdf files.
u: STASH_m01s00i002
v: STASH_m01s00i003
Theta: STASH_m01s00i004

Variables names are redefined in the nudging code as needed.

  • In nudging_varloader_pressure_lev.F90, line 398 onwards, (Case(2)), the code converts the input temperature to theta. Since I am already reading in theta, I commented out the code that converts T to Theta.

3) In the suite u-ba153, um > UM Science Settings > Section 39 - Nudging, ndg_relax_uvalue and ndg_relax_value are set to 2.0e-5 (which is about half that recommended for 6 hourly data). The relaxation parameter for T is 0.

This version runs okay.

Problem 1: The output of u and v (archived on crum) don't look very close to what I am nudging to.

Problem 2: If I turn on the nudging to T with the same factor, the model blows up.

Any insight on this would be really appreciated.

Thank you!

Alison

#2536 fixed vn10.9 UKCA STASH issues um_support admg26
Description

Hi,

Monsoon

Rose suite: u-az303 running UKCA vn10.9

Output after 1 month run: moose:/crum/u-az303/

I am trying to output u,v and T on all model levels and every 6 hours so I can use the output file to nudge a different model run.

I am confused about how domains work.

In STASH, I changed the dom_name of these 3 variables in stream UPC to be 'DALLRH'. After the run, I seems to be getting all horizontal grid points (nx=192, ny=145) but only 17 vertical levels.

On the other hand,

V COMPNT OF WIND AFTER TIMESTEP, output to UPG 
dom_name=DALLRH 
nx=192, ny=145 and nz=85

but

U COMPNT OF WIND AFTER TIMESTEP, output to UPG 
dom_name=DALLRH 
nx=192, ny=144 (!) and nz=85

I am using xconv to look at the pp files.

Cheers, Alison

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