module_radiation_astronomy

This module sets up astronomical quantities for solar radiation calculations. More...

Detailed Description

This module sets up astronomical quantities for solar radiation calculations.

Version

NCEP-Radiation_astronomy v5.2 Jan 2013

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Parameter constants
real(kind=kind_phys), parameter	module_radiation_astronomy::degrad = 180.0/con_pi
real(kind=kind_phys), parameter	module_radiation_astronomy::tpi = 2.0 * con_pi
real(kind=kind_phys), parameter	module_radiation_astronomy::hpi = 0.5 * con_pi
real(kind=kind_phys), parameter	module_radiation_astronomy::f12 = 12.0
real(kind=kind_phys), parameter	module_radiation_astronomy::f3600 = 3600.0
real(kind=kind_phys), parameter	module_radiation_astronomy::czlimt = 0.0001
real(kind=kind_phys), parameter	module_radiation_astronomy::pid12 = (2.0*asin(1.0))/f12

Module variable (to be set in module_radiation_astronomy::sol_init):
real(kind=kind_phys), public	module_radiation_astronomy::solc0 = con_solr
integer	module_radiation_astronomy::isolflg = 10
character(26)	module_radiation_astronomy::solar_fname = ' '

Module variables (to be set in module_radiation_astronomy::sol_update)
real(kind=kind_phys)	module_radiation_astronomy::sollag =0.0
	equation of time
real(kind=kind_phys)	module_radiation_astronomy::sindec =0.0
	sine of the solar declination angle
real(kind=kind_phys)	module_radiation_astronomy::cosdec =0.0
	cosine of the solar declination angle
real(kind=kind_phys)	module_radiation_astronomy::anginc =0.0
	solar angle increment per interation of cosz calc
real(kind=kind_phys), dimension(12)	module_radiation_astronomy::smon_sav
	saved monthly solar constants (isolflg=4 only)
integer	module_radiation_astronomy::iyr_sav =0
	saved year of data used
integer	module_radiation_astronomy::nstp =6
	total number of zenith angle iterations
subroutine, public	module_radiation_astronomy::sol_init
	This subroutine initializes astronomy process, and set up module constants. More...
subroutine, public	module_radiation_astronomy::sol_update
	This subroutine computes solar parameters at forecast time. More...
subroutine	module_radiation_astronomy::solar
	This subroutine computes radius vector, declination and right ascension of sun, and equation of time.
subroutine, public	module_radiation_astronomy::coszmn
	This subroutine computes mean cos solar zenith angle over SW calling interval. More...
subroutine	module_radiation_astronomy::prtime
	This subroutine prints out forecast date, time, and astronomy quantities.

Function/Subroutine Documentation

subroutine, public module_radiation_astronomy::coszmn

(

)

This subroutine computes mean cos solar zenith angle over SW calling interval.

Parameters

xlon	(IM), grids' longitudes in radians, work both on zonal, 0->2pi and -pi->+pi arrangements
sinlat	(IM), sine of the corresponding latitudes
coslat	(IM), cosine of the corresponding latitudes
solhr	time after 00z in hours
IM	num of grids in horizontal dimension
me	print message control flag
coszen	(IM), average of cosz for daytime only in sw call interval
coszdg	(IM), average of cosz over entire sw call interval

Definition at line 802 of file radiation_astronomy.f.

References anginc, cosdec, nstp, sindec, and sollag.

Referenced by module_radiation_driver::grrad().

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subroutine, public module_radiation_astronomy::sol_init

(

)

This subroutine initializes astronomy process, and set up module constants.

Parameters

me	print message control flag

Definition at line 146 of file radiation_astronomy.f.

References physcons::con_solr, physcons::con_solr_old, physparam::isolar, iyr_sav, nstp, and physparam::solar_file.

Referenced by module_radiation_driver::radinit().

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subroutine, public module_radiation_astronomy::sol_update

(

)

This subroutine computes solar parameters at forecast time.

Parameters

jdate	ncep absolute date and time at fcst time (yr, mon, day, t-zone, hr, min, sec, mil-sec)
kyear	usually kyear=jdate(1). if not, it is for hindcast mode, and it is usually the init cond time and serves as the upper limit of data can be used.
deltsw	time duration in seconds per sw calculation
deltim	timestep in seconds
lsol_chg	logical flags for change solar constant
me	print message control flag
slag	equation of time in radians
sdec,cdec	sin and cos of the solar declination angle
solcon	sun-earth distance adjusted solar constant \((w/m^2)\)

General Algorithm

1. Call solar()
2. Call prtime()

Definition at line 321 of file radiation_astronomy.f.

References anginc, cosdec, iyr_sav, nstp, prtime(), sindec, smon_sav, solar(), and sollag.

Referenced by module_radiation_driver::radupdate().

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