Understanding Ancillary Files for Climate Modeling
Dive into the world of ancillary files for climate modeling, covering their importance, types, creation process, and challenges faced in modifying file formats. Explore how these files play a crucial role in providing spatial inputs and essential variables for accurate simulations and analyses in climate science.
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Presentation Transcript
UM Ancillary Files ESM WG 2023-06-08 Martin Dix
What are ancillary files? Spatial inputs for non-prognostic variables Static or time dependent (climatological annual cycle or evolving) Land sea mask Orography Ozone Vegetation cover, LAI etc Aerosol emissions (SO2etc) 2 |
Creation UKCA ancillaries are netCDF Rest are UM fieldsfile format, same as model output Standard files created by CAP and/or ants (new) Cylc suite for ACCESS-CM2 NCI version of a GC5 suite partially working Nesting suite includes an ancillary suite 3 |
Process Start with high resolution master files (necessarily present day only) GLOBE30, SRTM orography IGBP, CCI vegetation River routing Land mask aware interpolation to model grid (includes some science) Atmosphere mask in coupled model derived from ocean mask Matching IGBP vegetation to JULES types Orography filtering and generation of subgrid scale for GWD 4 |
N96 mean orography Orography example GMTED 30 orography N96 std dev of orography 5 |
CMIP Input4MIPS created netCDF files for various forcing fields Met Office created ancillary files which we used directly for ACCESS-CM2 and interpolated for ACCESS-ESM1.5 6 |
Standard locations on gadi Many files mirrored from Met Office /g/data/access/umdir/ancil/atmos /g/data/access/TIDS/CMIP6_ANCIL Others are less organized /projects/access/data/ancil/access_v2 (ESM 1.5) /projects/access/data/ancil/access_cm2_n96e/O1 /projects/access/data/ancil/access_cm2_n96e/O025_20201102 7 |
Modifying File format is difficult to work with Header fields are complicated Need to be very careful with matching land sea mask Have used xancil for netCDF -> ancillary in the past Now better options with mule or ants to write files 8 |
