How to perform nudging simulations with the regional refined model (RRM)
This guide assumes that one has successfully run the regional refined simulation following the instructions (https://acme-climate.atlassian.net/wiki/display/ATM/Configuring%2C+building%2C+and+running+regionally+refined+CONUS+grid).
Step-by-step guide
- Create the analysis fields on the RRM grids
- Interpolate the analysis fields (e.g., ECMWF, NCEP, MERRA, and etc.) to the RRM grid.
- The nudging code (ACME/models/atm/cam/src/physics/cam/nudging.F90) is developed by Patrick Callaghan. The code can nudge the model states of U, V, T, Q, and/or PS in the physics module.
- It is important, in some cases, to account for the differences in the topography used in the source analysis data and that for a specific RRM configuration.
- If interested in the analysis fields used for the RRM-CONUS nudging simulation, please contact Qi Tang.
- Specify the nudging parameters
- The nudging parameters can be specified in the user_nl_cam.
- Details about the parameters are given in nudging.F90
- An updated version of example is documented in a recent GMD paper (Tang et al., 2019).
An example of nudging U and V outside the CONUS domain in the simulation for the CSSEF project is provided below:
&nudging_nl
Nudge_Model =.true.
Nudge_Path ='/gpfs/mira-fs0/projects/HiRes_Climate/qtang/Nudging/SE/INTERIM/arm_30_x8.g/2011/'
Nudge_File_Template='interim_se_%y%m%d00_%y%m%d18_TQUV.nc'
Nudge_Times_Per_Day=4
Model_Times_Per_Day=144
Nudge_Uprof =2
Nudge_Ucoef =1.00
Nudge_Vprof =2
Nudge_Vcoef =1.00
Nudge_Tprof =0
Nudge_Tcoef =0.00
Nudge_Qprof =0
Nudge_Qcoef =0.00
Nudge_PSprof =0
Nudge_PScoef =0.00
Nudge_Beg_Year =2011
Nudge_Beg_Month=1
Nudge_Beg_Day =1
Nudge_End_Year =2011
Nudge_End_Month=8
Nudge_End_Day =31
Nudge_Hwin_lo =1.0
Nudge_Hwin_hi =0.0
Nudge_Hwin_lat0 =38.
Nudge_Hwin_latWidth=34.
Nudge_Hwin_latDelta=3.8
Nudge_Hwin_lon0 =254.
Nudge_Hwin_lonWidth=44.
Nudge_Hwin_lonDelta=3.8
Nudge_Vwin_lo =0.0
Nudge_Vwin_hi =1.0
Nudge_Vwin_Hindex =31.
Nudge_Vwin_Hdelta =0.1
Nudge_Vwin_Lindex =0.
Nudge_Vwin_Ldelta =0.1
/
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