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jobsheet

yabwb ([cp yabeo] Remove GHG inc ; 4.5)

  1. Start time: 2000/12/1, length: 10/0/3
  2. Processors: 1 * 2, Exec name: $RUNID.exe; Timestep (mins): 30 (atmos); 60 (ocean)
  3. Start dumps: $DUMPS/xahiya.da00c10 $DUMPS/xahiyo.da00c10
  4. Fortran mods
  5. Diags
  6. Userprestash files
  7. See-also: yabeo, yabwa, yacfa
  8. History: yabwb -> yabeo -> a -> yabad -> a -> yaauo -> n -> yaasc -> yaaoa

Purpose of Run (long)

This run is a test of not-adding-increasing-GHG's. The "old standard" yabeo accidentally included increasing GHGs, and drifted principally in the tropics.

[2003/09/19]. This job has a number of mods in that it probably shouldn't, with regard to solar and volcanic effects. See http://home.badc.rl.ac.uk/iwi/lewis/lewis.html#hadcm3 for a stable run from Alan Iwi, or yacjc for my current stable control.

Results

Appears to work (but see-also yacfa) but in fact doesn't in the long term: 
@plot

The "old standard" yabeo clearly drifts (ahem, so why didn't I notice this earlier...). The new ones appear OK. If there is a problem, it is in the 64 bit version!

Lines on the piccy: monthly mean global avg sfc T; together with deseasonalised T.

Runs: yabeo (old std); yabwb (new std) at 32 and 64 bit; yabwa (old std, but run from 1860, thus without much GHG).

As an interesting and unexpected bonus, the QT_POS probelm goes away too (sometimes). How nice.

Past last modified: 7/5/2004   /   wmc@bas.ac.uk

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