Changes between Version 2 and Version 3 of Documentation/UserGuide/PresentDay
- Timestamp:
- 2014-11-21T14:50:27+01:00 (10 years ago)
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Documentation/UserGuide/PresentDay
v2 v3 5 5 6 6 == The boundary conditions == 7 LMDZOR was installed twice to avoid any confusion between the boundary files of the pre-industrial and the present day simulations. Hence, one installation will be used for the pre-industrial runs (and will thus use the pre-industrial boundary conditions), the other installation is to be used for present day simulations. For both sets of simulations an AMIP set-up was chosen. This set-up comes with acceptable BC between 1870 and 2100 which allows us to focus on the climate and reduce issues with sea surface temperature, see ice and aerosol concentrations. So copy the a n amip config.card to define the job that will create the BC7 LMDZOR was installed twice to avoid any confusion between the boundary files of the pre-industrial and the present day simulations. Hence, one installation will be used for the pre-industrial runs (and will thus use the pre-industrial boundary conditions), the other installation is to be used for present day simulations. For both sets of simulations an AMIP set-up was chosen. This set-up comes with acceptable BC between 1870 and 2100 which allows us to focus on the climate and reduce issues with sea surface temperature, see ice and aerosol concentrations. So copy the amip config.card to define the job that will create the BC 8 8 {{{ 9 9 cd config/LMDZOR_v5.2/ … … 11 11 }}} 12 12 The following changes were made to the config.card: 13 (1) Add a suffix, i.e., - 1750 (but keep the grid dimensions 128x118x39) to the job name so that the pre-industrial and present day boundary files will not interfere with each other on the store directory14 {{{ 15 JobName= ELI-128x118x39- 175013 (1) Add a suffix, i.e., -2010 (but keep the grid dimensions 128x118x39) to the job name so that the pre-industrial and present day boundary files will not interfere with each other on the store directory 14 {{{ 15 JobName= ELI-128x118x39-2010 16 16 }}} 17 17 (2) Set the begin date to the earliest year available. We are planning 20 year long equilibrium simulations but we are not sure whether it will take 20 or 30 years so we simulate the BC for 30 years to be on the safe side. 18 18 {{{ 19 DateBegin=1751-01-01 20 DateEnd=1780-12-31 21 }}} 22 (3) There is no need to manually create a directory for this experiment. When you use ./util/ins_job the script will create a directory with a copy of the config.card as well as the COMP, DRIVER and PARAM folder. 23 24 Following, more settings need to be changed and/or confirmed before launching the job: 25 (1) We now have to set-up the job to create files for the boundary conditions (BC) for the years 1751 to 1780 but we have no driver files for these years so we use the earliest years available. That varies from data stream to data stream so we used a creative solution. We are limited, for example by the SST and sea ice files that only go back until 1870. So we assume that the SST in 1870 represents pre-industrial conditions. 26 27 Open '''.../libIGCM/libIGCM_config/libIGCM_config.tsh''' and search for the phrase '# BEGIN: SHOULD GO IN A FUNCTION FROM libIGCM_date.ksh'. Then add: 28 {{{ 29 # BEGIN: SHOULD GO IN A FUNCTION FROM libIGCM_date.ksh 30 # Compute year_m1 and year_p1 (year minus 1Y and year plus 1Y) 31 year_m1=$(( year - 1 )) 32 year_p1=$(( year + 1 )) 33 # First year for SST 1870 = 1751 + 119 34 year_sst=$((year + 119)) 35 # First year for O3 is 1855 = 1751 + 104 36 year_o3=$((year + 104)) 37 # First year for nudged wind fields 1980 = 1751 + 229 38 year_nudge=$((year + 229)) 39 # First year of pre-industrial forcing 1765 = 1751 + 14 40 year_preind=$((year + 14)) 41 }}} 42 (2) These newly defined years now have to be used in COMP/lmdz.card. Therefore, change the boundary files as follows: 43 {{{ 44 List= (${R_INIT}/ATM/${config_UserChoices_TagName}/AMIP/amipbc_sst_360x180_${year_sst}.nc, amipbc_sst_1x1.nc), \ 45 (${R_INIT}/ATM/${config_UserChoices_TagName}/AMIP/amipbc_sic_360x180_${year_sst}.nc, amipbc_sic_1x1.nc), \ 46 (${R_INIT}/ATM/${config_UserChoices_TagName}/Ozone/HYBRIDE/v2.clim/tro3_${year_o3}.new.nc, climoz.nc) 47 }}} 48 (3) Note that many of the data files that are used to describe the boundary conditions can be found at 49 {{{ 50 /ccc/work/cont003/dsm/p86ipsl/IGCM/INIT/ATM/LMDZOR/ 51 }}} 52 53 The following, further, changes to were made to the COMP/lmdz.card: 19 DateBegin=1981-01-01 20 DateEnd=2010-12-31 21 }}} 22 (3) There is no need to manually create a directory for this experiment. When you use ./../../util/ins_job the script will create a directory with a copy of the config.card as well as the COMP, DRIVER and PARAM folder. 23 24 The following, further, changes were made to the COMP/lmdz.card: 54 25 (1) Specify in the list of parameter files that the BC should be based on the predefined pre-industrial settings. These settings contain the TOA solar incoming radiation, atmospheric CO2, CH4 and N2O among other settings. Have a look in PARAM/config.def_preind to get a better idea of these settings. 55 26 {{{ 56 (${SUBMIT_DIR}/PARAM/config.def_ preind, config.def), \27 (${SUBMIT_DIR}/PARAM/config.def_actuel , config.def), \ 57 28 }}} 58 29 (2) In the DRIVER/lmdz.driver it is specified that in the absence of the Oasis coupler, which is the case for LMDZOR, the ocean is forced. Hence the need of SST and sea ice files for all years in the experiment. … … 62 33 VEGET=y 63 34 }}} 64 Now the ELI-128x118x39- 1750 can be launched. It takes about 70 seconds per year so in this example it will take over 30 minutes to complete this 30-year job35 Now the ELI-128x118x39-2010 can be launched. It takes about 70 seconds per year so in this example it will take over 30 minutes to complete this 30-year job 65 36 {{{ 66 37 ccc_msub Job_ELI-128x118x39-1750 67 38 }}} 68 39 69 == The pre -industrialexperiment ==40 == The present day experiment == 70 41 Where for the BC run, an LMD experiment was copied, we now have to copy a LMDZOR experiment. We haven't tried whether LMDZ/clim BC files can be combined with LMDZOR/amip experiments but to keep it simple we propose to be consistent and thus combine LMDZ/amip BC files with an LMDZOR/amip experiment 71 42 {{{ … … 73 44 }}} 74 45 75 Edit the config card by changing the JOBNAME and setting the dates so that all dates of the experiment fall within the dates for which the BC were made. Alternatively, and that is what was done here we will run the experiment for the years we want, i.e., 1751-1770 and use offsets in the COMP/*.card settings to ensure the correct BC files were used.46 Edit the config card by changing the JOBNAME and setting the dates so that all dates of the experiment fall within the dates for which the BC were made. 76 47 {{{ 77 48 ../../util/ins_job … … 87 58 Restart=y 88 59 #-- Last day of the experience used as restart for this component if Restart=y 89 RestartDate= 1750-12-3160 RestartDate=2010-12-31 90 61 # Define restart simulation name for this component 91 62 RestartJobName=ACLF
