LFMFLD_GFS.f File Reference

lfmfld_gfs() computes layer mean LFM fields. More...

Go to the source code of this file.

Functions/Subroutines
subroutine	lfmfld_gfs (RH4410, RH7294, RH4472, RH3310)
	LFMFLD_GFS() computes layer mean LFM fields. More...

Detailed Description

lfmfld_gfs() computes layer mean LFM fields.

This routine computes three layer mean relative humidities and a precipitable water field from ETA level data. The computed fields are intended to mimic similar fields com- puted by the LFM. The algorithm used here is fairly pri- mative.

 In each column above a mass point on the ETA grid we set the following target pressures:
     Sigma layer 1.00 pressure:  Surface pressure
     Sigma layer 0.66 pressure:  0.50 * Surface pressure
     Sigma layer 0.33 pressure:  0.4356 * Surface pressure
 

Given there pressures a surface up summation is made of relative humidity and/or precipitable water between these target pressures. Each term in the summation is weighted By the thickness of the ETA layer. The final layer mean is this sum normalized by the total depth of the layer. There is, obviously, no normalization for precipitable water.

Parameters

[out]	RH3310	Sigma layer 0.33-1.00 mean relative humidity.
[out]	RH4410	Sigma layer 0.44-1.00 mean relative humidity.
[out]	RH7294	Sigma layer 0.72-0.94 mean relative humidity.
[out]	RH4472	Sigma layer 0.44-0.72 mean relative humidity.

Program History Log

Date	Programmer	Comments
1992-12-22	Russ Treadon	Initial
1993-07-27	Russ Treadon	Modified summation limits from 0.66*PSFC to 0.75*PSFC and 0.33*PSFC to 0.50*PSFC, where PSFC is the surfaces pressure. The reason for this change was recognition that in the LFM 0.33 and 0.66 were measured from the surface to the tropopause not the top of the model.
1993-09-13	Russ Treadon	RH calculations were made internal to the routine.
1996-03-04	Mike Baldwin	Change PW CALC to include CLD WTR
1998-06-16	T Black	Conversion from 1-D to 2-D
1998-08-17	Mike Baldwin	Compute RH over ice
1998-12-22	Mike Baldwin	Back out RH over ice
2000-01-04	Jim Tuccillo	MPI Version
2002-04-24	Mike Baldwin	WRF Version
2006-11-06	H CHUANG	Modify to output GFS LFM fields which have different thickness as MESO and use DP rather than DZ
2019-10-30	Bo Cui	Remove "GOTO" statement
2020-11-10	Jesse Meng	Use UPP_PHYSICS Module
2021-10-14	JESSE MENG	2D DECOMPOSITION

Author

Russ Treadon W/NP2

Date

1992-12-22

Definition in file LFMFLD_GFS.f.

Function/Subroutine Documentation

subroutine lfmfld_gfs	(	real, dimension(ista:iend,jsta:jend), intent(out)	RH4410,
		real, dimension(ista:iend,jsta:jend), intent(out)	RH7294,
		real, dimension(ista:iend,jsta:jend), intent(out)	RH4472,
		real, dimension(ista:iend,jsta:jend), intent(out)	RH3310
	)

LFMFLD_GFS() computes layer mean LFM fields.

Parameters

[out]	RH3310	Sigma layer 0.33-1.00 mean relative humidity.
[out]	RH4410	Sigma layer 0.44-1.00 mean relative humidity.
[out]	RH7294	Sigma layer 0.72-0.94 mean relative humidity.
[out]	RH4472	Sigma layer 0.44-0.72 mean relative humidity.

Definition at line 54 of file LFMFLD_GFS.f.

References upp_physics::fpvsnew().

Referenced by miscln().