Difference between pages "GA4.0 N216 Development" and "File:Xjcij eval yr10.pdf"

Revision as of 14:44, 2 January 2014

Evaluation suite output for the 10th year of xjcij

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+Evaluation suite output for the 10th year of xjcij
-As part of the GA4.0 UKCA development, in Cambridge we are developing a N216L85 GA4.0 model using the CheT(+GLOMAP) [[Developing_releases#2013_TropIsop.2FCheT_.2B_GLOMAP_.28Co-ordinator:_Graham_Mann.29|configuration]]. However, there is no GA4.0 N216 base model existing at MetUM version 8.4.
-==Create a GA4.0 N216 Base model==
-There are a number of steps that need to be made before a base GA4.0 N216 model is ready for UKCA to be included:
-# Assess the models available at the [http://collab.metoffice.gov.uk/trac/GA/wiki/GADocumentation/GA4.0#Jobs GA development page (password required)]
-#* This shows that the only existing N216 job available is [http://collab.metoffice.gov.uk/trac/GA/wiki/GAJobs/xhcea '''xhcea''' (password required)] on MONSooN
-#** This job ran for 30 years, and the output is available on MOOSE
-#** The original UKMO version of this job is '''ajthw'''.
-#* There are however GA4.0 N96 jobs available at vn8.0 ([http://collab.metoffice.gov.uk/trac/GA/wiki/GAJobs/aliur '''aliur''' (password required)]) and vn8.4 ([http://collab.metoffice.gov.uk/trac/GA/wiki/GAJobs/amche '''amche''' (password required)])
-# It is therefore necessary to regrid '''amche''' to N216 for use by UKCA
-#* There is a [http://collab.metoffice.gov.uk/trac/GA/wiki/GASettings/GA4.0_HRes guide on how change the horizontal resolution (password required)] on the GA twiki.
-#** The ancillary files can be taken from '''xhcea''' which already exist on MONSooN.
-#** There may be other changes that have been made between '''aliur''' and '''xhcea''' which are not represented in the guide. I have therefore asked Jeremy Walton to port '''aliur''' as well as '''amche''' over to MONSooN to check the differences.
-#* The new job '''xjgva''' has been created which is a GA4.0 N216L85 AMIP candidate, based on '''amche''' and using the differences from the [http://collab.metoffice.gov.uk/trac/GA/wiki/GASettings/GA4.0_HRes guide (password required)] and the differences between '''aliur''' and '''xhcea'''.
-#** Differences between vn8.0 GA4.0 N216 ('''xhcea''') and N96 ('''aliur'''): [[diff.xjgvx.xjgvz]]
-#** Differences between vn8.4 GA4.0 N216 ('''xjgva''') and N96 ('''amche'''): [[diff.xjgva.xjgvy]]
-#* It should be noted that the settings were mainly taken from the guide rather than the differences between vn8.0 jobs. Notable differences between '''xjgva''' and '''xhcea''', or '''xjgva''' and '''amche''', are:
-#*# In '''xjgva''' soil moisture has been initialised to <code>$USER_ANCIL/N216/orca025/smc_snow/v1/ajthma.smc_scaled</code> whereas '''amche''' sets this from the dump.
-#*# '''xjgva''' uses the same start dump as '''xhcea''': <code>$USER_ANCIL/N216/start_dumps/v1/ajthma.dai1910</code>.
-#*# In the ''Large Scale Precipitation'' section, '''xjgva''' uses '''7 substeps over full column''', rather than 10 in '''xhcea'''.
-#*# '''xjgva''' uses the standard vn8.4 spectral files, rather than the vn7.9 spectral files used by '''xhcea'''. There should be no difference in the components of the file used however.
-# '''xjgva''' compiled successfully and has been sent off for an equivalent 30-year run to '''xhcea'''.
-#* '''xjgva''' runs at approximately 2400 +/- 101 seconds for each 10-day jobstep, giving a maximum throughput of 12 model months per day.
-#* However, the actual throughput is quite variable, having between 3 and 12 model months per day with an average turnover of 9 model months at present.