Add an NWP compset #452
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enhancement
new capability or improved behavior of existing capability
priority: high
High priority to fix/merge soon, e.g., because it is a problem in important configurations
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ekluzek
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This will be an SP compset. |
billsacks
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May 1, 2019
Support for NWP configuration, NLDAS grid and NLDAS datm forcing
This tag includes a set of changes that, together, provide support for
running an initial Numerical Weather Prediction version of CTSM over the
Continental U.S.
(1) NWP configuration: The changes in this configuration relative to the
climate (CLM5) configuration mainly target decreasing runtime by
removing features that are expensive and not as important for NWP
time scales (days to months rather than many years) and space scales
(high resolution):
- Single dominant landunit; if vegetated, single dominant PFT
- Only 5 soil layers, down to 3 m
- Only 5 snow layers
- Plant hydraulic stress off
- Ball-Berry rather than Medlyn stomatal conductance method (this is
a side-effect of turning plant hydraulic stress off, and is not
itself a critical aspect of the NWP configuration)
- Maximum of 3 iterations to compute canopy fluxes
- MEGAN is off
Note that the NWP compset triggers changes in two new xml variables:
CLM_CONFIGURATION ('clm' vs. 'nwp'; this controls things of a more
scientific nature, like whether plant hydraulic stress is on or
off), and CLM_STRUCTURE ('standard' vs. 'fast'; this controls
structural things like the maximum number of landunits per grid cell
and the soil layer structure). Thus, you can create a case that is a
hybrid between the CLM and NWP configurations by changing these two
xml variables independently.
(2) NLDAS2 regional grid: 0.125 deg grid over the Continental U.S.
(3) Updated version of MOSART with support for the same NLDAS2 regional
grid
(4) NLDAS2 data atmosphere forcing: over the same regional grid; forcing
data are available from 1980 - 2018. (We have excluded 1979 because
a small amount of data were missing for that year, and we didn't
have a good way to handle those missing data.)
These changes can be used independently or all together. However, note
that you will get garbage if you try to use the new NLDAS2 datm forcing
for a run that extends beyond the boundaries of the NLDAS2 domain.
There are three new NWP compsets:
- I2000Ctsm50NwpSpGswpGs: GSWP3 datm forcing; meant for global runs or
regional runs outside the NLDAS domain
- I2000Ctsm50NwpSpNldasGs: NLDAS2 datm forcing; meant for regional runs
over the NLDAS domain or some portion of it
- I2000Ctsm50NwpSpNldasRsGs: Same as above, but with a stub runoff model
in place of MOSART, for runs that aren't interested in having a runoff
model and for which you want improved throughput
The alias for the new grid is: nldas2_rnldas2_mnldas2 (indicating that
we're using the nldas2 grid for land/atmosphere, runoff ('r') and the
ocean mask ('m').
- Resolves #451 (Add NWP physics option)
- Resolves #452 (Add an NWP compset)
olyson
added a commit
to olyson/ctsm
that referenced
this issue
Sep 30, 2019
My branch is based on ctsm1.0.dev035 and NWP support started with ctsm1.0.dev038
Support for NWP configuration, NLDAS grid and NLDAS datm forcing
This tag includes a set of changes that, together, provide support for
running an initial Numerical Weather Prediction version of CTSM over the
Continental U.S.
(1) NWP configuration: The changes in this configuration relative to the
climate (CLM5) configuration mainly target decreasing runtime by
removing features that are expensive and not as important for NWP
time scales (days to months rather than many years) and space scales
(high resolution):
- Single dominant landunit; if vegetated, single dominant PFT
- Only 5 soil layers, down to 3 m
- Only 5 snow layers
- Plant hydraulic stress off
- Ball-Berry rather than Medlyn stomatal conductance method (this is
a side-effect of turning plant hydraulic stress off, and is not
itself a critical aspect of the NWP configuration)
- Maximum of 3 iterations to compute canopy fluxes
- MEGAN is off
Note that the NWP compset triggers changes in two new xml variables:
CLM_CONFIGURATION ('clm' vs. 'nwp'; this controls things of a more
scientific nature, like whether plant hydraulic stress is on or
off), and CLM_STRUCTURE ('standard' vs. 'fast'; this controls
structural things like the maximum number of landunits per grid cell
and the soil layer structure). Thus, you can create a case that is a
hybrid between the CLM and NWP configurations by changing these two
xml variables independently.
(2) NLDAS2 regional grid: 0.125 deg grid over the Continental U.S.
(3) Updated version of MOSART with support for the same NLDAS2 regional
grid
(4) NLDAS2 data atmosphere forcing: over the same regional grid; forcing
data are available from 1980 - 2018. (We have excluded 1979 because
a small amount of data were missing for that year, and we didn't
have a good way to handle those missing data.)
These changes can be used independently or all together. However, note
that you will get garbage if you try to use the new NLDAS2 datm forcing
for a run that extends beyond the boundaries of the NLDAS2 domain.
There are three new NWP compsets:
- I2000Ctsm50NwpSpGswpGs: GSWP3 datm forcing; meant for global runs or
regional runs outside the NLDAS domain
- I2000Ctsm50NwpSpNldasGs: NLDAS2 datm forcing; meant for regional runs
over the NLDAS domain or some portion of it
- I2000Ctsm50NwpSpNldasRsGs: Same as above, but with a stub runoff model
in place of MOSART, for runs that aren't interested in having a runoff
model and for which you want improved throughput
The alias for the new grid is: nldas2_rnldas2_mnldas2 (indicating that
we're using the nldas2 grid for land/atmosphere, runoff ('r') and the
ocean mask ('m').
- Resolves ESCOMP#451 (Add NWP physics option)
- Resolves ESCOMP#452 (Add an NWP compset)
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We need a NWP compset that will turn on the ctsm-nwp1_0 physics option (see #451) as well as setup certain defaults (rivers and glaciers off).
@barlage @billsacks
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