RRTMG Gases Module

This module sets up ozone climatological profiles and other constant gas profiles, such as co2, ch4, n2o, o2, and those of cfc gases. All data are entered as mixing ratio by volume, except ozone which is mass mixing ratio (g/g). More...

Detailed Description

Version

NCEP-Radiation_gases v5.1 Nov 2012

Functions/Subroutines
subroutine, public	module_radiation_gases::gas_init (me)
	This subroutine sets up ozone, co2, etc. parameters. If climatology ozone then read in monthly ozone data. More...
subroutine, public	module_radiation_gases::gas_update (iyear, imon, iday, ihour, loz1st, ldoco2, me)
	This subroutine reads in 2-d monthly co2 data set for a specified year. Data are in a 15 degree lat/lon horizontal resolution. More...
subroutine, public	module_radiation_gases::getgases (plvl, xlon, xlat, IMAX, LMAX, gasdat )
	This subroutine sets up global distribution of radiation absorbing gases in volume mixing ratio. Currently only co2 has the options from observed values, all other gases are asigned to the climatological values. More...
subroutine, public	module_radiation_gases::getozn (prslk, xlat, IMAX, LM, o3mmr )
	This subroutine sets up climatological ozone profile for radiation calculation. This code is originally written by Shrinivas Moorthi. More...

Function/Subroutine Documentation

subroutine, public module_radiation_gases::gas_init

(

integer, intent(in)

me

)

Parameters

me	print message control flag

subroutine, public module_radiation_gases::gas_update	(	integer, intent(in)	iyear,
		integer, intent(in)	imon,
		integer, intent(in)	iday,
		integer, intent(in)	ihour,
		logical, intent(in)	loz1st,
		logical, intent(in)	ldoco2,
		integer, intent(in)	me
	)

Parameters

iyear	year of the requested data for fcst
imon	month of the year
iday	day of the month
ihour	hour of the day
loz1st	clim ozone 1st time update control flag
ldoco2	co2 update control flag
me	print message control flag

General Algorithm

• Ozone data section
• co2 data section

subroutine, public module_radiation_gases::getgases	(	real (kind=kind_phys), dimension(:,:), intent(in)	plvl,
		real (kind=kind_phys), dimension(:), intent(in)	xlon,
		real (kind=kind_phys), dimension(:), intent(in)	xlat,
		integer, intent(in)	IMAX,
		integer, intent(in)	LMAX,
		real (kind=kind_phys), dimension(:,:,:), intent(out)	gasdat
	)

Parameters

plvl	(IMAX,LMAX+1), pressure at model layer interfaces (mb)
xlon	(IMAX), grid longitude in radians, ok both 0->2pi or -pi -> +pi arrangements
xlat	(IMAX), grid latitude in radians, default range to pi/2 -> -pi/2, otherwise see in-line comment
IMAX,LMAX	horizontal/vertical dimensions for output data
gasdat	(IMAX,LMAX,NF_VGAS) - gases volume mixing ratioes (:,:,1) - co2 (:,:,2) - n2o (:,:,3) - ch4 (:,:,4) - o2 (:,:,5) - co (:,:,6) - cfc11 (:,:,7) - cfc12 (:,:,8) - cfc22 (:,:,9) - ccl4 (:,:,10) - cfc113

subroutine, public module_radiation_gases::getozn	(	real (kind=kind_phys), dimension(:,:), intent(in)	prslk,
		real (kind=kind_phys), dimension(:), intent(in)	xlat,
		integer, intent(in)	IMAX,
		integer, intent(in)	LM,
		real (kind=kind_phys), dimension(:,:), intent(out)	o3mmr
	)

Parameters

prslk	(IMAX,LM), exner function = $(p/p0)^{rocp}$
xlat	(IMAX), latitude in radians, default to pi/2 -> -pi/2 range, otherwise see in-line comment
IMAX,LM	horizontal and vertical dimensions
o3mmr	(IMAX,LM), output ozone profile in mass mixing ratio (g/g)