FRZLVL.f File Reference

Subroutine that computes FRZING LVL, Z and RH. More...

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Functions/Subroutines
subroutine	frzlvl (zfrz, rhfrz, pfrzl)
	FRZLVL() Subroutine that computes FRZING LVL, Z and RH.

Detailed Description

Subroutine that computes FRZING LVL, Z and RH.

This routine computes the freezing level height and relative humidity at this level for each mass point on the ETA grid. The computed freezing level height is the mean sea level height. At each mass point we move up from the surface to
find the first ETA layer where the temperature is less than 273.16K. Vertical interpolation in temperature to the freezing temperature gives the freezing level height. Pressure and
specific humidity are interpolated to this level and along with the temperature provide the freezing level relative humidity. If the surface (skin) temperature is below freezing, the routine uses surface based fields to compute the relative humidity.

Note that in posting freezing level data the LFM look-alike file (IE, GRID 26), we pack 273.15K as the freezing temperature. All other output grids use 273.16K.

Parameters

[out]	ZFRZ	Above ground level freezing height.
[out]	RHFRZ	Relative humidity at freezing level.
[out]	PFRZL	pressure at freezing level.

Program History Log

Date	Programmer	Comments
1992-12-22	Russ Treadon	Initial
1993-06-05	Russ Treadon	Corrected freezing level heights to be with respect to mean sea level, not above ground level
1998-06-15	T Black	Conversion from 1-D to 2-D
1998-08-17	Mike Baldwin	Compute RH over ice if necessary
1998-12-22	Mike Baldwin	Back out RH over ice
2000-01-04	Jim Tuccillo	MPI version
2001-10-25	H Chuang	Modified to process hybrid model output
2002-01-15	Mike Baldwin	WRF version
2010-08-27	T. Smirnova	Added PFRZL to the output
2019-10-30	Bo Cui	Remove "GOTO" statement
2020-11-10	Jesse Meng	Use UPP_PHYSICS module
2021-10-15	JESSE MENG	2D DECOMPOSITION

Author

Russ Treadon W/NP2

Date

1992-12-22

Definition in file FRZLVL.f.

Function/Subroutine Documentation

frzlvl()

subroutine frzlvl	(	real, dimension(ista:iend,jsta:jend)	zfrz,
		real, dimension(ista:iend,jsta:jend)	rhfrz,
		real, dimension(ista:iend,jsta:jend)	pfrzl
	)

FRZLVL() Subroutine that computes FRZING LVL, Z and RH.

Parameters

[out]	ZFRZ	real Above ground level freezing height.
[out]	RHFRZ	real Relative humidity at freezing level.
[out]	PFRZL	real Pressure at freezing level.

Definition at line 48 of file FRZLVL.f.

Referenced by miscln().