Subroutine that computes T, Q, U, V, P, and ICING on the flight levels (FD). More...

Functions/Subroutines
subroutine	fdlvl (itype, tfd, qfd, ufd, vfd, pfd, icingfd)
	fdlvl() Subroutine that computes T, Q, U, V, P, ICING on the flight levels (FD).

subroutine	fdlvl_mass (itype, nfd, ptfd, htfd, nin, qin, qtype, qfd)
	Computes FD level for mass variables.

subroutine	fdlvl_uv (itype, nfd, htfd, ufd, vfd)
	Computes FD level for u,v.

Detailed Description

Subroutine that computes T, Q, U, V, P, and ICING on the flight levels (FD).

This routine computes temperature, spec. hum, u wind component, and v wind component on the NFD=6 FD levels. The height of these levels (in meters) is given in the data statement below. The alogrithm proceeds as follows. (AGL-Above ground level in parentheses)

At each mass point move up vertically from the LM-TH (lowest atmospheric) ETA layer. Find the ETA layers whose
height (above ground) bounds the target FD level height. Vertically interpolate to get temperature at this FD level. Average the four surrounding winds to get a mass point wind. Vertically interpolate these mass point winds to the target FD level. Continue this process until all NFD=6 FD levels have been processed. Move on to the next mass point.

Averaging the four above ground winds to the mass point was found to smooth the field and reduce the occurrence of point peak winds far in excess of the winds at adjacent points. Mass point values are returned.

Parameters

[in]	ITYPE	Flag that determines whether MSL (1) or AGL (2) Levels are used.
[out]	TFD	Temperature (K) on FD levels.
[out]	QFD	Spec hum on FD levels.
[out]	UFD	U wind (m/s) on FD levels.
[out]	VFD	V wind (m/s) on FD levels.
[out]	PFD	Pressure (Pa) on FD levels.
[out]	ICINGFD	Icing on FD levels (see https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-207.shtml).

Program History Log

Date	Programmer	Comments
1992-12-22	Russ Treadon	Initial
1993-11-23	Russ Treadon	Corrected routine to compute FD levels with respect to mean sea level
1994-01-04	Mike Baldwin	Include options for computing either AGL or MSL
1998-06-15	T Black	Conversion from 1-D to 2-D
2000-01-04	Jim Tuccillo	MPI version
2002-01-15	Mike Baldwin	WRF version
2011-12-14	Sarah Lu	Add GOCART aerosol AERFD
2021-10-15	JESSE MENG	2D DECOMPOSITION
2022-09-22	Li(Kate) Zhang	Remove Dust=> AERFD

Author: Russ Treadon W/NP2

Date: 1992-12-22

Definition in file FDLVL.f.

Function/Subroutine Documentation

◆ fdlvl()

subroutine fdlvl	(	integer, dimension(nfd), intent(in)	itype,
		real, dimension(ista:iend,jsta:jend,nfd), intent(out)	tfd,
		real, dimension(ista:iend,jsta:jend,nfd), intent(out)	qfd,
		real, dimension(ista:iend,jsta:jend,nfd), intent(out)	ufd,
		real, dimension(ista:iend,jsta:jend,nfd), intent(out)	vfd,
		real, dimension(ista:iend,jsta:jend,nfd), intent(out)	pfd,
		real, dimension(ista:iend,jsta:jend,nfd), intent(out)	icingfd
	)

fdlvl() Subroutine that computes T, Q, U, V, P, ICING on the flight levels (FD).

Parameters

[in]	ITYPE	Flag that determines whether MSL (1) or AGL (2) Levels are used.
[out]	TFD	Temperature (K) on FD levels.
[out]	QFD	Spec hum on FD levels.
[out]	UFD	U wind (m/s) on FD levels.
[out]	VFD	V wind (m/s) on FD levels.
[out]	PFD	Pressure (Pa) on FD levels.
[out]	ICINGFD	Icing on FD levels.

Definition at line 59 of file FDLVL.f.

References exch().

Referenced by miscln().

◆ fdlvl_mass()

subroutine fdlvl_mass	(	integer, dimension(nfd), intent(in)	itype,
		integer, intent(in)	nfd,
		real, dimension(nfd), intent(in)	ptfd,
		real, dimension(nfd), intent(in)	htfd,
		integer, intent(in)	nin,
		real, dimension(ista:iend,jsta:jend,lm,nin), intent(in)	qin,
		character, dimension(nin), intent(in)	qtype,
		real, dimension(ista:iend,jsta:jend,nfd,nin), intent(out)	qfd
	)

Computes FD level for mass variables.

This routine computes mass variables (temperature, spec. hum...) on NFD FD levels. The height of these levels (in meters) is passed as an input parameter. The alogrithm proceeds as follows. (AGL-Above ground level in parentheses)

At each mass point move up vertically from the LM-TH (lowest atmospheric) ETA layer. Find the ETA layers whose
height (above ground) bounds the target FD level height. Vertically interpolate to get temperature at this FD level. Average the four surrounding winds to get a mass point wind. Vertically interpolate these mass point winds to the target FD level. Continue this process until all NFD FD levels have been processed. Move on to the next mass point.

Averaging the four above ground winds to the mass point was found to smooth the field and reduce the occurrence of point peak winds far in excess of the winds at adjacent points. Mass point values are returned.

NOTES for Q fields by Y Mao: The following safety check should be executed by the caller of FDLVL subroutines. Safety check to avoid tiny QFD values. KRF: Need NCAR and NMM WRF cores in this check as well?

IF(modelname=='RAPR' .OR. modelname=='NCAR' .OR. modelname=='NMM') THEN   !
  DO ifd = 1,nfd
    DO j=jsta,jend
    DO i=1,im
       if(qfd(i,j,ifd) < 1.0e-8) qfd(i,j,ifd)=0.0
    ENDDO
    ENDDO
  ENDDO
endif

Parameters

[in]	ITYPE	Flag that determines whether MSL (1) or AGL (2) Levels are used.
[in]	NFD	Number of FD levels.
[in]	PTFD	FD pressure levels.
[in]	HTFD	FD height levels.
[in]	NIN	Number of input fields.
[in]	QIN	Array of mass point value on model levels.
[in]	QTYPE	Charater array of variable type to differentiate underground interpolation. C-5 Cloud Species K-TURBULENT KINETIC ENERGY Q-Specific Humidity T-Temperature, W-Vertical Velocity or Omega
[out]	QFD	Array of mass point value on FD levels.

Program History Log

Date	Programmer	Comments
1992-12-22	Russ Treadon	Initial
1993-11-23	Russ Treadon	Corrected routine to compute FD levels with respect to mean sea level
1994-01-04	Mike Baldwin	Include options for computing either AGL or MSL
1998-06-15	T Black	Conversion from 1-D to 2-D
2000-01-04	Jim Tuccillo	MPI version
2002-01-15	Mike Baldwin	WRF version
2011-12-14	Sarah Lu	Add GOCART aerosol AERFD
2017-06-01	Y Mao	Add FD levels for GTG(EDPARM CATEDR MWTURB) and allow levels input from control file
2019-09-25	Y Mao	Seperate mass from UV allow array of mass input to interpolate multiple fields with the same levels at one time. Dust=> AERFD can be processed when NIN=NBIN_DU
2020-11-10	Jesse Meng	Use UPP_PHYSICS module
2022-05-25	Y Mao	Remove interpolation of w/omega/Hydrometeor fields on FD levels

Author: Russ Treadon W/NP2

Date: 1992-12-22

Definition at line 798 of file FDLVL.f.

Referenced by miscln().

◆ fdlvl_uv()

subroutine fdlvl_uv	(	integer, dimension(nfd), intent(in)	itype,
		integer, intent(in)	nfd,
		real, dimension(nfd), intent(in)	htfd,
		real, dimension(ista_2l:iend_2u,jsta_2l:jend_2u,nfd), intent(out)	ufd,
		real, dimension(ista_2l:iend_2u,jsta_2l:jend_2u,nfd), intent(out)	vfd
	)

Computes FD level for u,v.

This routine computes u/v wind component on NFD FD levels. The height of these levels (in meters) is passed as an input parameter. The alogrithm proceeds as follows. (AGL-Above ground level in parentheses)

At each mass point move up vertically from the LM-TH (lowest atmospheric) ETA layer. Find the ETA layers whose
height (above ground) bounds the target FD level height. Vertically interpolate to get temperature at this FD level. Average the four surrounding winds to get a mass point wind. Vertically interpolate these mass point winds to the target FD level. Continue this process until all NFD FD levels have been processed. Move on to the next mass point.

Averaging the four above ground winds to the mass point was found to smooth the field and reduce the occurrence of point peak winds far in excess of the winds at adjacent points. Mass point values are returned.

Parameters

[in]	ITYPE	Flag that determines whether MSL (1) or AGL (2) Levels are used.
[in]	NFD	Number of FD levels.
[in]	HTFD	FD levels.
[out]	UFD	U wind (m/s) on FD levels.
[out]	VFD	V wind (m/s) on FD levels.

Program History Log

Date	Programmer	Comments
1992-12-22	Russ Treadon	Initial
1993-11-23	Russ Treadon	Corrected routine to compute FD levels with respect to mean sea level
1994-01-04	Mike Baldwin	Include options for computing either AGL or MSL
1998-06-15	T Black	Conversion from 1-D to 2-D
2000-01-04	Jim Tuccillo	MPI version
2002-01-15	Mike Baldwin	WRF version
2011-12-14	Sarah Lu	Add GOCART aerosol AERFD
2019-09-25	Y Mao	Seperate U/V from mass

Author: Russ Treadon W/NP2

Date: 1992-12-22

Definition at line 467 of file FDLVL.f.

References exch().

Functions/Subroutines

Detailed Description

Program History Log

Function/Subroutine Documentation

◆ fdlvl()

◆ fdlvl_mass()

Program History Log

◆ fdlvl_uv()

Program History Log