LFMFLD.f File Reference

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

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Functions/Subroutines
subroutine	lfmfld (rh3310, rh6610, rh3366, pw3310)
	LFMFLD() computes layer mean LFM fields.

Detailed Description

lfmfld() 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]	RH6610	Sigma layer 0.66-1.00 mean relative humidity.
[out]	RH3366	Sigma layer 0.33-0.66 mean relative humidity.
[out]	PW3310	Sigma layer 0.33-1.00 precipitable water.

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
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.f.

Function/Subroutine Documentation

lfmfld()

subroutine lfmfld	(	real, dimension(ista:iend,jsta:jend), intent(inout)	rh3310,
		real, dimension(ista:iend,jsta:jend), intent(inout)	rh6610,
		real, dimension(ista:iend,jsta:jend), intent(inout)	rh3366,
		real, dimension(ista:iend,jsta:jend), intent(inout)	pw3310
	)

LFMFLD() computes layer mean LFM fields.

Parameters

[out]	RH3310	real Sigma layer 0.33-1.00 mean relative humidity.
[out]	RH6610	real Sigma layer 0.66-1.00 mean relative humidity.
[out]	RH3366	real Sigma layer 0.33-0.66 mean relative humidity.
[out]	PW3310	real Sigma layer 0.33-1.00 precipitable water.

Definition at line 52 of file LFMFLD.f.

Referenced by miscln().