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Additional topics

Nudging towards "climatology"

The nudging towards "climatology" is an optional step to avoid issue (like sharp gradients) near the open sea boundaries. A flow relexation zone can be implemented in ROMS by using the followings settings:

LtracerCLM == T T  ! enable processing of CLIM data
LnudgeTCLM == T T  ! nudge to CLIM data
TNUDG == 2*10.0d0                    ! days

Make nudging on inflow is stronger than on outflow

OBCFAC == 10.0d0                      ! nondimensional

Set also NUDNAME to the file name create by the julia script.

Atmospheric forcing fields

  • For the Ligurian Sea, necessary parameters have already been prepared and are available in the file ROMS-implementation.zip. It containts data download the from

the ECMWF operational archive (Atmosphere/ecmwf_operational_archive_2018-12-01T00:00:00_2020-01-01T00:00:00.nc). This NetCDF file needs to be converted by the julia function ROMS.prepare_ecmwf.

  • The remaining of this section explained how to download data from the ECMWF operational archive (e.g. for a different domain). These instructions are not needed now.
  • Adapt the file name, longitude/latitude and time range (start one day earlier, and finish one day later) in forcing_ecmwf.py and execute the script as follows:
python3 forcing_ecmwf.py

List of variables (*: quantities accumulated over the integration period ("step"))

NetCDF Variable nameDescription
mslMean sea level pressure
u1010 metre U wind component
v1010 metre V wind component
t2m2 metre temperature
d2m2 metre dewpoint temperature
tccTotal cloud cover*
sshfSurface sensible heat flux*
strdSurface thermal radiation downwards*
ssrSurface net solar radiation*
strSurface net thermal radiation*
ewssEastward turbulent surface stress*
nsssNorthward turbulent surface stress*
eEvaporation*
roRunoff*
tpTotal precipitation*
sstSea surface temperature
parPhotosynthetically active radiation at the surface*

Validation

Check out satellite data (e.g. sea surface temperature, sea surface height) at:

Make some comparison with satellite and the downloaded in situ observation

Hydrodynamic model troubleshooting

Hydrodynamic model troubleshooting

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