NAM_FRC

Application of a specific forcing is enabled by a dedicated flag. When a Newtonian relaxation is requested, the damping time XRELAX_TIME_FRC and the height (fixed or physically based) above which the forcing is applied, XRELAX_HEIGHT_FRC and CRELAX_HEIGHT_TYPE, must be set.

NAM_FRC content

Fortran name	Fortran type	Default value
LGEOST_UV_FRC	LOGICAL	.FALSE.
LGEOST_TH_FRC	LOGICAL	.FALSE.
LTEND_THRV_FRC	LOGICAL	.FALSE.
LTEND_UV_FRC	LOGICAL	.FALSE.
LVERT_MOTION_FRC	LOGICAL	.FALSE.
LRELAX_THRV_FRC	LOGICAL	.FALSE.
LRELAX_UV_FRC	LOGICAL	.FALSE.
LRELAX_UVMEAN_FRC	LOGICAL	.FALSE.
XRELAX_TIME_FRC	REAL	10800.0
XRELAX_HEIGHT_FRC	REAL	0.0
CRELAX_HEIGHT_TYPE	CHARACTER(LEN=4)	‘FIXE’
LTRANS	LOGICAL	.FALSE.
XUTRANS	REAL	0.0
XVTRANS	REAL	0.0
LDEEPOC	LOGICAL	.FALSE.
XCENTX_OC	REAL	16000.0
XCENTY_OC	REAL	16000.0
XRADX_OC	REAL	8000.0
XRADY_OC	REAL	8000.0

• LGEOST_UV_FRC : flag to use a prescribed geostrophic wind.

  • .TRUE. to integrate a geostrophic wind with a constant Coriolis parameter \(f=2 \times \Omega \times SIN(XLAT0)\). The LCORIO flag of NAM_DYN must be .TRUE.

  • .FALSE. not active

• LGEOST_TH_FRC : flag to apply a large scale horizontal advection on the potential temperature field. The gradients result from the thermal wind balance.

  • .TRUE. to integrate an horizontal advection of \(\theta\).

  • .FALSE. not active

• LTEND_THRV_FRC : flag to simulate a large scale \(\theta\) and humidity tendency.

  • .TRUE. to integrate a tendency for \(\theta\) and \(r_v\).

  • .FALSE. not active

• LTEND_UV_FRC : flag to simulate a large scale wind tendency.

  • .TRUE. to integrate a tendency for u and v.

  • .FALSE. not active

• LVERT_MOTION_FRC : flag to simulate a large scale vertical transport of all the prognostic fields.

  • .TRUE. to integrate a vertical transport with an upstream scheme.

  • .FALSE. not active

• LRELAX_THRV_FRC : flag to apply a Newtonian relaxation on the potential temperature and humidity fields.

  • .TRUE. to relax \(\theta\) and \(r_v\) towards large scale values.

  • .FALSE. not active

• LRELAX_UV_FRC : flag to apply a Newtonian relaxation on each horizontal wind component.

  • .TRUE. to relax the horizontal wind towards large scale values.

  • .FALSE. not active

• LRELAX_UVMEAN_FRC : flag to apply a Newtonian relaxation on the horizontal mean value of each horizontal wind component.

  • .TRUE. to relax the horizontal mean wind towards large scale values.

  • .FALSE. not active

• XRELAX_TIME_FRC : constant damping time for the forced relaxation.

• XRELAX_HEIGHT_FRC : height above which a forced relaxation is enabled when CRELAX_HEIGHT_TYPE=’FIXE’ or minimal height if ‘THGR’ is used.

• CRELAX_HEIGHT_TYPE : definition of the height above which a forced relaxation is enabled.

  • ‘FIXE’ means that a forced relaxation is never applied below XRELAX_HEIGHT_FRC.

  • ‘THGR’ means that a forced relaxation is never applied below the maximal height between XRELAX_HEIGHT_FRC and the height above which \(\partial \theta / \partial z\) is the highest for each column.

• LTRANS : flag to apply a Galilean translation of the domain of simulation

  • .TRUE. The translation speed of the domain of simulation will be XUTRANS,XVTRANS

  • .FALSE. : not active

• LDEEPOC : flag to activate an idealized forcing at the surface for oceanic deep convection (if LOCEAN=T)

• XCENTX_OC : x-position (in meters) of the center of the surface forcing for ideal ocean deep convection (if LOCEAN=T and LDEEPOC=T)

• XCENTY_OC : y-position (in meters) of the center of the surface forcing for ideal ocean deep convection (if LOCEAN=T and LDEEPOC=T)

• XRADX_OC : x-radius (in meters) of the surface forcing for ideal ocean deep convection (if LOCEAN=T and LDEEPOC=T)

• XRADY_OC : y-radius (in meters) of the surface forcing for ideal ocean deep convection (if LOCEAN=T and LDEEPOC=T)