MOSAIX MOSAIX is a small set of fortran routines, bash scripts, python scripts and xml files allowing to generate coupling weights for the IPSL Earth System Model. It is under development, and recently used in production runs used by the production runs. It aims to replace the old MOSAIC software. It uses XIOS as a library to compute weights. In the present state, it can handle ORCA, LMDZ lon/lat and DYNAMICO grids.
MOSAIX can generate second order conservative interpolation weights. They are used in place of bilinear interpolation by OASIS-MCT.
As MOSAIX uses XIOS, it works in parallel, using MPI distributed memory.
MOSAIC is known to work with XIOS revision 2286
XIOS : http://forge.ipsl.fr/ioserver/svn/XIOS/trunk
Extraction : svn co http://forge.ipsl.fr/ioserver/svn/XIOS/trunk XIOS
MOSAIX is under CeCILL_V2 licence. See Licence_CeCILL_V2-en.txtfile for an english version of the licence and Licence_CeCILL_V2-fr.txt for a french version.
Permission is hereby granted, free of charge, to any person or organization obtaining a copy of the software and accompanying documentation covered by this license (the Software) to use, reproduce, display, distribute, execute, and transmit the Software, and to prepare derivative works of the Software, and to permit third-parties to whom the Software is furnished to do so, all subject to the following warning :
Warning, to install, configure, run, use any of MOSAIX software or to read the associated documentation you'll need at least one (1) brain in a reasonably working order. Lack of this implement will void any warranties (either express or implied). Authors assumes no responsability for errors, omissions, data loss, or any other consequences caused directly or indirectly by the usage of his software by incorrectly or partially configured
Geographical distribution of the calving for the northern hemisphere.
MOSAIX and the old method MOZAIC are very similar for temperature, albedo, ice cover and heat and water fluxes. However, MOSAIX generates weights that are slighlty different from those generated by MOZAIC. The global conservation is better.
For wind stress, the old method relies on OASIS bilinear interpolation (from the Scrip library). MOSAIX generates 2nd order weights.
For runoff, the method is different. We have run three simulations with IPSLCM6 LR to check the new weights :
Results available at tgcc:$CCCSTOREDIR/../../gencmip6/p86caub/IGCM_OUT/IPSLCM6/DEVT/piControl
An intermonitoring is available at http://webservices2017.ipsl.fr/interMonitoring/tmp/interMonitoring_plot01_pAPyBD_prod/
A CESMEP atlas is under preparation.
MOSAIX been developped and extensively used on Irene (TGCC) Skylake computer, using the Intel compilation tools.
MOSAIX is supposed to work on any computer where XIOS works.
It has been tested on Mac OS X, using gcc as a compiler. It is fragile, as regularly XIOS updates break the compatibility.
MOSAIX needs files describing the grid of the models. See CreateWeightsMask.bash and the bottom of this page.
All netCDF files have a detailed header.
make_xios [options] options : [--xios path] : path to XIOS. Default is ../XIOS [--full] : to regenerate dependencies and recompile from scratch Example : ./make_mosaix --xios ../XIOS
1) Defines a coastal band on land in the atmosphere model. For LMDZ rectilinear grids, the width of this band is parametrized, in grid points. For ico grids, the band contains only point with a fraction of ocean in ]0,1[.
2) Defines a coastal band on ocean in the ocean model. The width of this band is parametrized.
3) An atmosphere point of the coastal band is linked to an ocean point in the coastal band if the distance between the two is less than searchRadius.
1) The atmosphere model integrate the calving over on specific regions. Presently the regions are three latitudinal bands with limits 90°S/40°S/50°N/90°N.
2) The weights distribute the calving in the ocean in the corresponding latitudinal bands. By default, the distribution is uniform.
3) For the southernmost band, it is possible to use a geographical distribution read in a file. These files are currently available for eORCA1 and eORCA025.
Generating icosahedral grid in double precision using XIOS:
Here are the main changes:
..... <domain_definition> <domain id="dom_glo" data_dim="2" /> <domain id="dom_glo_p8" domain_ref="dom_glo" prec="8" /> <domain id="greordered" domain_ref="dom_glo"> <reorder_domain invert_lat="true" shift_lon_fraction="0"/> </domain> </domain_definition> ... <grid_definition> ..... <grid id="grid_glo"> <domain domain_ref="dom_glo" /> </grid> <grid id="grid_glo_p8"> <domain domain_ref="dom_glo_p8" /> </grid> .....
<field_definition level="1" prec="4" operation="average" freq_op="1ts" enabled=".true." default_value="9.96921e+36" domain_ref="dom_glo"> <field_group id="fields_2D_p8" grid_ref="grid_glo_p8" prec="8"> <field id="aire_p8" field_ref="aire" long_name="Grid area p8" unit="-" /> <field id="fract_oce_p8" field_ref="fract_oce" long_name="Fraction oce p8" unit="1" /> <field id="fract_sic_p8" field_ref="fract_sic" long_name="Fraction sic p8" unit="1" /> <field id="fract_oce_plus_sic_p8" long_name="Fraction oce plus sic p8" unit="1" /> <field id="mask_oce_plus_sic_p8" long_name="Masque oce plus sic p8" unit="1" /> </field_group> [...] </field_definition>
<file_definition> <file_group id="defile"> <file id="grid_p8" name="grid_p8" output_freq="1d" sync_freq="10d" output_level="2" enabled="true" timeseries="none" time_counter="none"> <field_group grid_ref="grid_glo_p8" ts_enabled="true" freq_op="1d" expr="@this"> <field field_ref="aire_p8" level="1" operation="once" /> <field field_ref="fract_oce_p8" level="1" operation="once" /> <field field_ref="fract_sic_p8" level="1" operation="once" /> </field_group> <field_group grid_ref="grid_glo_p8" ts_enabled="true" freq_op="1d" > <field field_ref="fract_oce_plus_sic_p8" level="1" > fract_oce + fract_sic </field> <field field_ref="mask_oce_plus_sic_p8" level="1" > ((fract_oce + fract_sic) > 0) ? 1 : 0 </field> </field_group> </file> ..........