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getmet.f90
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getmet.f90
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!**********************************************************************
! GETMET.FOR
!
! This file contains all the subroutines required to read the met data
! file. The main routines (called externally to this file) are:
! OPENMETF - opens the met file & reads the format information
! RESTARTMETF - finds the start of the actual met data in the met file
! GETMET - calls the appropriate subroutine to read the met data, based
! on the flag MFLAG describing the format
! SKIPMET - skips any unwanted met data
! ALTERMETOTC - alters met data to account for effects of OTC
! ALTERMETCC - alters met data in accordance with climate change scenario
! GETWIND - calculates wind speed through the canopy using exponential formula
!
! Subsidiary routines are:
! 1. Subroutines to read in data
! GETMETDAY - reads the standard daily met data format
! GETMETHR - reads the standard hourly met data format
! READENVIRON - reads in constant met data values
! READLAT - reads latitude and longitude
! READDELTAT - reads in information needed to calculate incident radiation, if needed
! 2. Subroutines to process temperatures & rainfall
! CALCTHRLY - calculates hourly air temps from Tmax & Tmin
! CALCTSOIL - sets hourly soil temp equal to average daily air temp
! ASSIGNRAIN - assigns daily rainfall to hours in the day
! 3. Subroutines to process VPD/RH
! CALCRH - calculates hourly RH from hourly air temp & the minimum temp
! RHTOVPD - converts RH to VPD
! VPDTORH - converts VPD to RH
! TDEWTORH - calculates RH from air temperature & dewpoint temperature
! MFDTORH - converts from water vapour mole fraction to RH
! VPDTOMFD - converts from VPD to water vapour mole fraction
! CALCAH - converts relative humidity to absolute humidity (called by ALTERMETCC)
! AHTORH - converts absolute humidity to relative humidity (called by ALTERMETCC)
! 4. Subroutines to process radiation
! ESTPARIN - estimates daily incident radiation from temperature
! CALPARHHRLY - calculates hourly incident PAR from daily totals of beam & diffuse
! CALCFBMD - calculates diffuse fraction of daily incident radiation
! CALCFBMH - calculates diffuse fraction of hourly incident radiation
! CALCFSUN - calculate sunlit fraction of hour (presently unused)
! CALCNIR - calculates incident NIR from incident PAR
! THERMAL - calculates incident thermal radiation from air temperature
! CALCFBMWN - an alternative method to calculate the diffuse fraction (currently unused)
! 5. Additionally, the following functions are provided:
! SATUR - calculate water vapour saturation pressure at given T MOVED TO UTILS
! TK - calculate T in Kelvin given T in Celsius MOVED TO UTILS
! ETRAD - calculate radiation incident on the atmosphere
!**********************************************************************
!**********************************************************************
SUBROUTINE OPENMETF(ISTART,IEND,CAK,PRESSK,SWMIN,SWMAX, &
DIFSKY,ALAT,TTIMD,DELTAT, &
MFLAG,METCOLS,NOMETCOLS,MTITLE,MSTART)
! This subroutine opens the meteorological data file and reads the
! data describing it. It checks that it covers the dates of the simulation
! and returns the format of the met file.
! INPUTS:
! ISTART, IEND - Desired start and end of simulation (in days-since-1950) - from confile. If not defined,
! program uses all met data.
! OUTPUTS:
! CAK - Constant CO2 concentration (umol mol-1), if specified; 0 otherwise
! PRESSK - Constant air pressure (Pa), if specified; PATM otherwise
! SWMIN - Minimum soil water content
! SWMAX - Maximum soil water content - in same units as soil water content in met data
! DIFSKY - Parameter indicating light distribution over cloudy sky, if specified; default 0
! ALAT - latitude, in radians (-ve for S hemisphere)
! TTIMD - time difference between longitude of plot & longitude of time zone, in hours
! MFLAG - indicates whether daily (0) or hourly (1) met data
! METCOLS - array containing the number of the column corresponding to each met data element used by program
! NOMETCOLS - number of columns of met data
! MTITLE - title of met data file
! MSTART - start date of met data (in days-since-1950 format)
! DELTAT - monthly mean daily temperature amplitude
!**********************************************************************
USE maestcom
USE metcom
IMPLICIT NONE
CHARACTER*8 COLUMNS(MAXMET)
CHARACTER*256 STARTDATE,ENDDATE
REAL DELTAT(12)
INTEGER METCOLS(MAXMET),KHRSPERDAY,NOCOLUMNS,IOERROR
INTEGER, EXTERNAL :: IDATE50
INTEGER DAYORHR,MSTART,MEND,ISTART,IEND,ICOL,MFLAG,I,NOMETCOLS
NAMELIST /METFORMAT/ DAYORHR, KHRSPERDAY, NOCOLUMNS, COLUMNS, STARTDATE, ENDDATE
REAL CAK,PRESSK,DIFSKY,SWMIN,SWMAX,ALAT,TTIMD
CHARACTER*80 MTITLE
990 FORMAT (A60) ! For reading titles in input files.
! Open input file with met data
OPEN (UMET, FILE = 'met.dat', STATUS='OLD')
READ (UMET, 990) MTITLE
! Read in unchanging met data
CALL READENVIRON(UMET, CAK, PRESSK, DIFSKY, SWMIN, SWMAX)
! Read in latitude & longitude
CALL READLAT(UMET, ALAT, TTIMD)
KHRSPERDAY = 0
! Read format
REWIND(UMET)
READ (UMET,METFORMAT,IOSTAT = IOERROR)
IF (IOERROR.NE.0) &
CALL SUBERROR('ERROR IN MET FILE: MISSING FORMAT INFORMATION', &
IFATAL,IOERROR)
! Check dates of simulation are covered
MSTART = IDATE50(STARTDATE)
MEND = IDATE50(ENDDATE)
IF ((ISTART.EQ.0).AND.(IEND.EQ.0)) THEN
ISTART = MSTART
IEND = MEND
ELSE
IF ((ISTART.LT.MSTART).OR.(IEND.GT.MEND)) &
CALL SUBERROR('ERROR: MET FILE DOES NOT COVER DATES', &
IFATAL,IOERROR)
END IF
! Process number of hours per day - the old KHRS
IF (KHRSPERDAY.EQ.0) &
CALL SUBERROR('ERROR: ADD KHRSPERDAY TO MET.DAT FORMAT', &
IFATAL,KHRSPERDAY)
IF (KHRSPERDAY.GT.MAXHRS) &
CALL SUBERROR('ERROR: KHRSPERDAY MUST NOT EXCEED MAXHRS', &
IFATAL,KHRSPERDAY)
KHRS = KHRSPERDAY
HHRS = (KHRS)/2
SPERHR = 3600*24/KHRS
! Process columns - assign column numbers to METCOLS array
IF (NOCOLUMNS.GT.MAXMET) THEN
CALL SUBERROR('ERROR: TOO MANY MET DATA COLUMNS: DATA LOST', &
IWARN,-1)
NOCOLUMNS = MAXMET
END IF
! Initialise array of met columns
DO 10 ICOL = 1,MAXMET
METCOLS(ICOL) = MISSING
10 CONTINUE
MFLAG = DAYORHR
! If MFLAG = 0, look for daily values; if MFLAG = 1, hourly values
IF (MFLAG.EQ.0) THEN ! Daily values
DO 20 I = 1,NOCOLUMNS
ICOL = MISSING
IF (COLUMNS(I).EQ.'DATE') THEN
ICOL = MDDATE
ELSEIF (COLUMNS(I).EQ.'WIND') THEN
ICOL = MDWIND
ELSEIF (COLUMNS(I).EQ.'TMIN') THEN
ICOL = MDTMIN
ELSEIF (COLUMNS(I).EQ.'TMAX') THEN
ICOL = MDTMAX
ELSEIF (COLUMNS(I).EQ.'PAR') THEN
ICOL = MDPAR
ELSEIF (COLUMNS(I).EQ.'SI') THEN
ICOL = MDSI
ELSEIF (COLUMNS(I).EQ.'FBEAM') THEN
ICOL = MDFBEAM
ELSEIF (COLUMNS(I).EQ.'CA') THEN
ICOL = MDCA
ELSEIF (COLUMNS(I).EQ.'PRESS') THEN
ICOL = MDPRESS
ELSEIF (COLUMNS(I).EQ.'PPT') THEN
ICOL = MDPPT
ELSEIF (COLUMNS(I).EQ.'SW') THEN
ICOL = MDSWC
ELSEIF (COLUMNS(I).EQ.'SWP') THEN
ICOL = MDSWP
ENDIF
IF (ICOL.NE.MISSING) METCOLS(ICOL) = I
20 CONTINUE
! Check to see if any of the essential information is missing.
IF (METCOLS(MDTMIN).EQ.MISSING) &
CALL SUBERROR('ERROR: NEED VALUES OF TMIN IN MET FILE', &
IFATAL,0)
IF (METCOLS(MDTMAX).EQ.MISSING) &
CALL SUBERROR('ERROR: NEED VALUES OF TMAX IN MET FILE', &
IFATAL,0)
IF ((METCOLS(MDPAR).EQ.MISSING).AND.(METCOLS(MDSI).EQ.MISSING)) &
CALL READDELTAT(UMET,DELTAT,IOERROR)
IF ((abs(CAK - 0.0) < 0.00001).AND.(METCOLS(MDCA).EQ.MISSING)) &
CALL SUBERROR('ERROR: NO VALUE FOR CA IN MET FILE', &
IFATAL,0)
ELSE ! Hourly values
DO 30 I = 1,NOCOLUMNS
ICOL = MISSING
IF (COLUMNS(I).EQ.'DATE') THEN
ICOL = MHDATE
ELSEIF (COLUMNS(I).EQ.'WIND') THEN
ICOL = MHWIND
ELSEIF (COLUMNS(I).EQ.'TAIR') THEN
ICOL = MHTAIR
ELSEIF (COLUMNS(I).EQ.'TSOIL') THEN
ICOL = MHTSOIL
ELSEIF (COLUMNS(I).EQ.'RH') THEN
ICOL = MHRH
ELSEIF (COLUMNS(I).EQ.'RH%') THEN
ICOL = MHRHP
ELSEIF (COLUMNS(I).EQ.'VPD') THEN
ICOL = MHVPD
ELSEIF (COLUMNS(I).EQ.'PAR') THEN
ICOL = MHPAR
ELSEIF (COLUMNS(I).EQ.'RAD') THEN
ICOL = MHRAD
ELSEIF (COLUMNS(I).EQ.'FBEAM') THEN
ICOL = MHFBEAM
ELSEIF (COLUMNS(I).EQ.'CA') THEN
ICOL = MHCA
ELSEIF (COLUMNS(I).EQ.'MFD') THEN
ICOL = MHMFD
ELSEIF (COLUMNS(I).EQ.'PRESS') THEN
ICOL = MHPRESS
ELSEIF (COLUMNS(I).EQ.'TDEW') THEN
ICOL = MHTDEW
ELSEIF (COLUMNS(I).EQ.'PPT') THEN
ICOL = MHPPT
ELSEIF (COLUMNS(I).EQ.'SW') THEN
ICOL = MHSWC
ELSEIF (COLUMNS(I).EQ.'SWP') THEN
ICOL = MHSWP
ENDIF
IF (ICOL.NE.MISSING) METCOLS(ICOL) = I
30 CONTINUE
! Check to see if any of the essential information is missing.
IF (METCOLS(MHTAIR).EQ.MISSING) &
CALL SUBERROR('ERROR: NEED VALUES OF TAIR IN MET FILE', &
IFATAL,0)
IF ((METCOLS(MHPAR).EQ.MISSING).AND.(METCOLS(MHRAD).EQ.MISSING)) &
CALL READDELTAT(UMET,DELTAT,IOERROR)
IF ((abs(CAK - 0.0) < 0.00001).AND.(METCOLS(MHCA).EQ.MISSING)) &
CALL SUBERROR('ERROR: NO VALUE FOR CA IN MET FILE', &
IFATAL,0)
END IF
NOMETCOLS = NOCOLUMNS
RETURN
END !OpenMetF
!**********************************************************************
SUBROUTINE RESTARTMETF(ISTART,MSTART,MFLAG)
! Position met file at start of met data
! BM Changed 10/00: Start of data must be directly specified
! INPUTS:
! ISTART - Date for which met data is wanted
! MSTART - Date on which met data starts
! MFLAG - indicates whether daily or hourly data
!**********************************************************************
USE maestcom
IMPLICIT NONE
INTEGER IOERROR,MFLAG,LINESTOSKIP,ISTART,MSTART,I
CHARACTER*60 TMPTXT, DATASTART
DATASTART = 'DATA STARTS'
REWIND(UMET)
! Read through format information to find start of data
990 FORMAT (A60)
30 READ (UMET,990,IOSTAT = IOERROR) TMPTXT
IF (IOERROR.NE.0) &
CALL SUBERROR('ERROR: COULD NOT FIND START OF MET DATA', &
IFATAL,IOERROR)
IF (TMPTXT.NE.DATASTART) GOTO 30
! Read data until the start date
IF (MFLAG.EQ.0) THEN
LINESTOSKIP = ISTART-MSTART
ELSE
LINESTOSKIP = KHRS*(ISTART-MSTART)
END IF
DO 40 I = 1,LINESTOSKIP
READ (UMET,990,IOSTAT = IOERROR) TMPTXT
IF (IOERROR.NE.0) &
CALL SUBERROR('READ PAST EOF IN RESTARTMETF', &
IFATAL,IOERROR)
40 CONTINUE
RETURN
END !RestartMetF
!**********************************************************************
SUBROUTINE READENVIRON(UFILE,CAK,PRESSK,DIFSKYI,SWMINI,SWMAXI)
! Read in environmental conditions which do not change with time.
! These must be at the start of the met.dat file.
! INPUT:
! UFILE - file number of met data file
! OUTPUTS:
! CAK - Constant CO2 concentration (umol mol-1), if specified; 0 otherwise
! PRESSK - Constant air pressure (Pa), if specified; PATM otherwise
! DIFSKYI - Parameter indicating light distribution over cloudy sky, if specified; default 0
! SWMINI - Minimum soil water content
! SWMAXI - Maximum soil water content - in same units as soil water content in met data
!**********************************************************************
USE maestcom
IMPLICIT NONE
NAMELIST /ENVIRON/ CA,PRESS,DIFSKY, SWMIN, SWMAX
INTEGER UFILE,IOERROR
REAL CA,PRESS,DIFSKY, SWMIN, SWMAX
REAL CAK,PRESSK,DIFSKYI, SWMINI, SWMAXI
! Default values
PRESS = PATM
CA = 0
DIFSKY = 0.0
SWMIN = 0.0
SWMAX = 1.0
! Read namelist
READ (UFILE, ENVIRON, IOSTAT = IOERROR)
IF (IOERROR.NE.0) THEN
CALL SUBERROR( &
'WARNING: DEFAULT VALUES: PRESS = 101.25 kPa, DIFSKY = 0', &
IWARN,IOERROR)
END IF
CAK = CA
PRESSK = PRESS
DIFSKYI = DIFSKY
SWMINI = SWMIN
SWMAXI = SWMAX
RETURN
END !ReadEnviron
!**********************************************************************
SUBROUTINE READDELTAT(UFILE,DELTATI,IOERROR)
! Read in mean monthly daily temperature amplitudes
! Needed to calculate incident PAR (if not specified) using routine of Bristow & Campbell 1984
! If not present, program will stop (only called if PAR not specified).
!**********************************************************************
USE maestcom
IMPLICIT NONE
NAMELIST /BRISTO/ DELTAT
REAL DELTAT(12),DELTATI(12)
INTEGER UFILE,IOERROR,I
! Read namelist
REWIND(UFILE)
READ (UFILE, BRISTO, IOSTAT = IOERROR)
IF (IOERROR.NE.0) THEN
CALL SUBERROR( &
'ERROR: NEED VALUES OF PAR IN MET FILE OR DELTAT', &
IFATAL,0)
END IF
DO 10 I = 1,12
DELTATI(I) = DELTAT(I)
10 CONTINUE
RETURN
END !ReadDeltat
!**********************************************************************
SUBROUTINE GETMET(IDATE,MFLAG,ZEN,METCOLS,NOMETCOLS, &
CAK,PRESSK,SWMIN,SWMAX,DELTAT,ALAT,DEC,DAYL, &
windah,tsoil,tair,radabv,fbeam,RH,VPD,VMFD,CA,PRESS, &
PPT,SOILMOIST,SOILDATA)
! According to the value of MFLAG, this subroutine calls the appropriate
! subroutine to read in the meteorological data for use in MAESTRO.
! It is important that all handling of meteorological data occurs within
! this function. In particular, the flag MFLAG should not be referred to
! within the main body of the program. This maintains modularity & makes it
! easier to add new met data formats.
! The values passed to this function are:
! IDATE - date of simulation, in years-since-1950 format
! MFLAG - flag indicating the format of the input file
! ZEN - the zenith angle of the sun
! NOMETCOLS - the number of columns in the met file
! METCOLS - the format of the columns in the met file
! CAK - Constant CO2 concentration (umol mol-1), if specified; 0 otherwise
! PRESSK - Constant air pressure (Pa), if specified; PATM otherwise
! SWMINI - Minimum soil water content
! SWMAXI - Maximum soil water content - in same units as soil water content in met data
! The values which must be returned are:
! arrays of KHRSly values of the following met variables:
! WINDAH - wind speed in m s-1
! TSOIL - soil surface temperature (degrees !)
! TAIR - air temperature (degrees !)
! RADABV(3) - incident radiation in three wavelengths (J m-2 s-1)
! FBEAM(3) - beam fractions of radiation in 3 wavelengths (fraction)
! RH - relative humidity of air (fraction)
! VPD - vapour pressure deficit of air (Pa)
! VMFD - mole fraction deficit (mmol mol-1)
! CA - the atmospheric CO2 concentration (umol mol-1)
! PRESS - the atmospheric pressure (Pa)
! PPT - rainfall over the time period (mmol H2O m-2)
! SOILMOIST - soil moisture data - either potential (MPa) or deficit (dimnless)
! SOILDATA - type of soil moisture data
!**********************************************************************
USE maestcom
IMPLICIT NONE
REAL ZEN(MAXHRS)
REAL WINDAH(MAXHRS),TSOIL(MAXHRS),TAIR(MAXHRS)
REAL RADABV(MAXHRS,3),FBEAM(MAXHRS,3)
REAL RH(MAXHRS),VPD(MAXHRS),CA(MAXHRS),VMFD(MAXHRS),PRESS(MAXHRS)
REAL PPT(MAXHRS), SOILMOIST(MAXHRS)
REAL DELTAT(12)
INTEGER METCOLS(MAXMET),SOILDATA,MFLAG,IDATE,NOMETCOLS
REAL CAK,PRESSK,SWMIN,SWMAX,ALAT,DEC,DAYL
! Call appropriate function to read met file.
IF (MFLAG.EQ.0) THEN
CALL GETMETDAY(IDATE,ZEN,NOMETCOLS,METCOLS, &
CAK,PRESSK,SWMIN,SWMAX,DELTAT,ALAT,DEC,DAYL, &
windah,tsoil,tair,radabv,fbeam,RH,VPD,VMFD,CA,PRESS, &
PPT,SOILMOIST,SOILDATA)
ELSE IF (MFLAG.EQ.1) THEN
CALL GETMETHR(IDATE,ZEN,NOMETCOLS,METCOLS, &
CAK,PRESSK,SWMIN,SWMAX,DELTAT,ALAT,DEC,DAYL, &
windah,tsoil,tair,radabv,fbeam,RH,VPD,VMFD,CA,PRESS, &
PPT,SOILMOIST,SOILDATA)
! ELSE
! insert other formats if required
END IF
RETURN
END !GetMet
!**********************************************************************
SUBROUTINE GETMETDAY(IDATE,ZEN,NOMETCOLS,METCOLS, &
CAK,PRESSK,SWMIN,SWMAX,DELTAT,ALAT,DEC,DAYL, &
windah,tsoil,tair,radabv,fbeam,RH,VPD,VMFD,CA,PRESS, &
PPT,SOILMOIST,SOILDATA)
! Read daily met data: see function GETMET for parameter definitions
!**********************************************************************
USE maestcom
USE metcom
IMPLICIT NONE
INTEGER METCOLS(MAXMET),SOILDATA,IOERROR,I,NOMETCOLS
INTEGER IHR,IDATE
REAL ZEN(MAXHRS)
REAL DATAIN(MAXMET)
REAL windah(MAXHRS),tsoil(MAXHRS),TAIR(MAXHRS),PPT(MAXHRS)
REAL SOILMOIST(MAXHRS)
REAL RADABV(MAXHRS,3),FBEAM(MAXHRS,3),FSUN(MAXHRS)
REAL RH(MAXHRS),VPD(MAXHRS),VMFD(MAXHRS),CA(MAXHRS),PRESS(MAXHRS)
REAL DELTAT(12)
REAL WIND,PRESSK,TMAX,TMIN,DAYL,PRECIP,ALAT,DEC,PAR,FBM
REAL RADBM,RADDF,SMD,CAK,SWMIN,SWMAX
! Read in day's data
READ (UMET,*,IOSTAT = IOERROR) (DATAIN(I), I = 1,NOMETCOLS)
IF (IOERROR.NE.0) &
CALL SUBERROR('ERROR READING MET DATA',IFATAL,IOERROR)
! Set up wind speed array
IF (METCOLS(MDWIND).EQ.MISSING) THEN
WIND = DEFWIND ! Very default value - CHECK!!
ELSE IF (DATAIN(METCOLS(MDWIND)).LE.0) THEN
WIND = DEFWIND
ELSE
WIND = DATAIN(METCOLS(MDWIND))
END IF
DO 30 I = 1,KHRS
WINDAH(I) = WIND
30 CONTINUE
! Set up pressure array
IF (METCOLS(MDPRESS).NE.MISSING) THEN
DO 35 IHR = 1,KHRS
PRESS(IHR) = DATAIN(METCOLS(MDPRESS))
35 CONTINUE
ELSE
DO 37 IHR = 1,KHRS
PRESS(IHR) = PRESSK
37 CONTINUE
END IF
! Calculate hourly temperatures
TMAX = DATAIN(METCOLS(MDTMAX))
TMIN = DATAIN(METCOLS(MDTMIN))
CALL CALCTHRLY(TMAX,TMIN,DAYL,TAIR)
! Calculate soil temperatures
CALL CALCTSOIL(TAIR,TSOIL)
! Calculate relative humidities
CALL CALCRH(TMIN,TAIR,RH)
! Calculate VPDs
CALL RHTOVPD(RH,TAIR,VPD)
! Calculate VMFDs
CALL VPDTOMFD(VPD,PRESS,VMFD)
! Calculate incident PAR
IF (METCOLS(MDSI).EQ.MISSING) THEN
IF (METCOLS(MDPAR).EQ.MISSING) THEN
PRECIP = 0.0
IF (METCOLS(MDPPT).NE.MISSING) PRECIP = DATAIN(METCOLS(MDPPT))
CALL BRISTO(IDATE,TMAX,TMIN,PRECIP,DELTAT,ALAT,DEC,DAYL,PAR)
ELSE
PAR = DATAIN(METCOLS(MDPAR))
END IF
END IF
! Calculate diffuse fraction
IF (METCOLS(MDFBEAM).EQ.MISSING) THEN
IF (METCOLS(MDSI).EQ.MISSING) THEN
CALL CALCFBMD(IDATE,ZEN,PAR,FBM)
ELSE
CALL CALCFBMD(IDATE,ZEN,DATAIN(METCOLS(MDSI))*FPAR,FBM)
END IF
ELSE
FBM = DATAIN(METCOLS(MDFBEAM))
END IF
! Calculate PAR
IF (METCOLS(MDSI).EQ.MISSING) THEN
RADBM = PAR*FBM
RADDF = PAR*(1.-FBM)
ELSE
RADBM = DATAIN(METCOLS(MDSI))*FBM*FPAR
RADDF = DATAIN(METCOLS(MDSI))*(1.-FBM)*FPAR
END IF
CALL CALCPARHRLY(RADBM,RADDF,ZEN,RADABV,FBEAM)
! Calculate NIR
CALL CALCNIR(RADABV,FBEAM)
! Calculate FSUN
CALL CALCFSUN(FBEAM,FSUN)
! Calculate thermal radiation
CALL THERMAL(TAIR,VPD,FSUN,RADABV)
! Read in value of CA if present - NB could add daily variation if wished?
IF (METCOLS(MDCA).NE.MISSING) THEN
DO 40 IHR = 1,KHRS
CA(IHR) = DATAIN(METCOLS(MDCA))
40 CONTINUE
ELSE
DO 45 IHR = 1,KHRS
CA(IHR) = CAK
45 CONTINUE
END IF
! Read in rainfall data
DO 50 IHR = 1,KHRS
PPT(IHR) = 0.0 ! Initially set all values to zero
50 CONTINUE
IF (METCOLS(MDPPT).NE.MISSING) THEN
CALL ASSIGNRAIN(DATAIN(METCOLS(MDPPT)),PPT)
END IF
! Calculate soil moisture deficit - assume unchanging over course of day
IF (METCOLS(MDSWP).NE.MISSING) THEN
SOILDATA = POTENTIAL
SMD = DATAIN(METCOLS(MDSWP))
ELSE IF (METCOLS(MDSWC).NE.MISSING) THEN
SOILDATA = DEFICIT
IF (SMD.GT.SWMAX) THEN
CALL SUBERROR('SW CONTENT EXCEEDS MAX',IWARN,-1)
SMD = 0.0
ELSE IF (SMD.LT.SWMIN) THEN
CALL SUBERROR('SW CONTENT IS LESS THAN MIN',IWARN,-1)
SMD = 1.0
ELSE
SMD = (SWMAX - DATAIN(METCOLS(MDSWC)))/(SWMAX - SWMIN)
END IF
ELSE
SOILDATA = NONE
SMD = 0.0
END IF
DO 60 IHR = 1,KHRS
SOILMOIST(IHR) = SMD
60 CONTINUE
RETURN
END !GetMetDay
!**********************************************************************
SUBROUTINE GETMETHR(IDATE,ZEN,NOMETCOLS,METCOLS, &
CAK,PRESSK,SWMIN,SWMAX,DELTAT,ALAT,DEC,DAYL, &
WINDAH,TSOIL,TAIR,RADABV,FBEAM,RH,VPD,VMFD,CA,PRESS, &
PPT,SOILMOIST,SOILDATA)
! Read hourly met data: see function GETMET for parameter definitions
!**********************************************************************
USE maestcom
USE metcom
IMPLICIT NONE
INTEGER IHR,IOERROR,I,NOMETCOLS
INTEGER METCOLS(MAXMET),SOILDATA
INTEGER IDATE
REAL DATAIN(MAXHRS,MAXMET)
REAL WINDAH(MAXHRS),TSOIL(MAXHRS),TAIR(MAXHRS)
REAL RADABV(MAXHRS,3),FBEAM(MAXHRS,3),FSUN(MAXHRS)
REAL RH(MAXHRS),VPD(MAXHRS),VMFD(MAXHRS),TDEW(MAXHRS)
REAL CA(MAXHRS),PRESS(MAXHRS),ZEN(MAXHRS),PPT(MAXHRS)
REAL SOILMOIST(MAXHRS)
REAL DELTAT(12),PRESSK,TMIN,TMAX,DAYPPT,ALAT,DEC,DAYL
REAL PAR,FBM,RADBM,RADDF,CALCFBMH,CAK,SWMIN,SWMAX
! Read in one day's worth of data at a time.
DO 20 IHR = 1,KHRS
READ (UMET,*,IOSTAT = IOERROR) (DATAIN(IHR,I), I = 1,NOMETCOLS)
IF (IOERROR.NE.0) &
CALL SUBERROR('ERROR READING MET DATA',IFATAL,IOERROR)
20 CONTINUE
! Set up pressure array
IF (METCOLS(MHPRESS).NE.MISSING) THEN
DO 35 IHR = 1,KHRS
PRESS(IHR) = DATAIN(IHR,METCOLS(MHPRESS))
35 CONTINUE
ELSE
DO 37 IHR = 1,KHRS
PRESS(IHR) = PRESSK
37 CONTINUE
END IF
! Set up wind speed array
DO 30 IHR = 1,KHRS
IF (METCOLS(MHWIND).EQ.MISSING) THEN
WINDAH(IHR) = DEFWIND ! Very default value!!
ELSE IF (DATAIN(IHR,METCOLS(MHWIND)).LE.0) THEN
WINDAH(IHR) = DEFWIND
ELSE
WINDAH(IHR) = DATAIN(IHR,METCOLS(MHWIND))
END IF
30 CONTINUE
! Set hourly air temperatures
TMIN = DATAIN(1,METCOLS(MHTAIR))
TMAX = DATAIN(1,METCOLS(MHTAIR))
DO 40 IHR = 1,KHRS
TAIR(IHR) = DATAIN(IHR,METCOLS(MHTAIR))
IF (TAIR(IHR).LT.TMIN) TMIN = TAIR(IHR)
IF (TAIR(IHR).GT.TMAX) TMAX = TAIR(IHR)
40 CONTINUE
! Set hourly soil temperatures
IF (METCOLS(MHTSOIL).EQ.MISSING) THEN
CALL CALCTSOIL(TAIR,TSOIL)
ELSE
DO 50 IHR = 1,KHRS
TSOIL(IHR) = DATAIN(IHR,METCOLS(MHTSOIL))
50 CONTINUE
END IF
! Read in RH, VPD, VMFD, Tdew
IF (METCOLS(MHRH).NE.MISSING) THEN
DO 60 IHR = 1,KHRS
RH(IHR) = DATAIN(IHR,METCOLS(MHRH))
60 CONTINUE
ELSE IF (METCOLS(MHRHP).NE.MISSING) THEN
DO 70 IHR = 1,KHRS
RH(IHR) = DATAIN(IHR,METCOLS(MHRHP))/100.0
70 CONTINUE
END IF
IF (METCOLS(MHVPD).NE.MISSING) THEN
DO 80 IHR = 1,KHRS
VPD(IHR) = DATAIN(IHR,METCOLS(MHVPD))
80 CONTINUE
END IF
IF (METCOLS(MHTDEW).NE.MISSING) THEN
DO 82 IHR = 1,KHRS
TDEW(IHR) = DATAIN(IHR,METCOLS(MHTDEW))
82 CONTINUE
END IF
IF (METCOLS(MHMFD).NE.MISSING) THEN
DO 85 IHR = 1,KHRS
VMFD(IHR) = DATAIN(IHR,METCOLS(MHMFD))
85 CONTINUE
END IF
! Calculate RH if not in file
IF ((METCOLS(MHRH).EQ.MISSING).AND.(METCOLS(MHRHP).EQ.MISSING)) THEN
IF (METCOLS(MHVPD).NE.MISSING) THEN
CALL VPDTORH(VPD,TAIR,RH)
ELSEIF (METCOLS(MHTDEW).NE.MISSING) THEN
CALL TDEWTORH(TDEW,TAIR,RH)
ELSEIF (METCOLS(MHMFD).NE.MISSING) THEN
CALL MFDTORH(VMFD,PRESS,TAIR,RH)
ELSE
CALL CALCRH(TMIN,TAIR,RH)
END IF
END IF
! Calculate VPD if not in file
IF (METCOLS(MHVPD).EQ.MISSING) THEN
CALL RHTOVPD(RH,TAIR,VPD)
END IF
! Calculate VMFD if not in file
IF (METCOLS(MHMFD).EQ.MISSING) THEN
CALL VPDTOMFD(VPD,PRESS,VMFD)
END IF
! Read in rainfall if present. Convert mm to mmol m-2.
DAYPPT = 0.0
IF (METCOLS(MHPPT).NE.MISSING) THEN
DO 140 IHR = 1,KHRS
PPT(IHR) = DATAIN(IHR,METCOLS(MHPPT))*1E6/18.
DAYPPT = DAYPPT+PPT(IHR)
140 CONTINUE
ELSE
DO 150 IHR = 1,KHRS
PPT(IHR) = 0.0
150 CONTINUE
END IF
! Must have either PAR (umol m-2 s-1) or global radiation (W m-2)
IF (METCOLS(MHPAR).NE.MISSING) THEN
DO 90 IHR = 1,KHRS
RADABV(IHR,1) = DATAIN(IHR,METCOLS(MHPAR)) / UMOLPERJ
90 CONTINUE
!!!!! BUG CORRECTED, WAS METCOLS(MHSW) !!!! (RAD, MAY 2009)
ELSE IF(METCOLS(MHRAD).NE.MISSING) THEN
DO 95 IHR = 1,KHRS
RADABV(IHR,1) = DATAIN(IHR,METCOLS(MHRAD)) * FPAR
95 CONTINUE
ELSE
CALL BRISTO(IDATE,TMAX,TMIN,DAYPPT,DELTAT,ALAT,DEC,DAYL,PAR)
CALL CALCFBMD(IDATE,ZEN,PAR,FBM)
RADBM = PAR*FBM
RADDF = PAR*(1.-FBM)
CALL CALCPARHRLY(RADBM,RADDF,ZEN,RADABV,FBEAM)
END IF
! Calculate beam fractions
IF (METCOLS(MHFBEAM).NE.MISSING) THEN
DO 100 IHR = 1,KHRS
FBEAM(IHR,1) = DATAIN(IHR,METCOLS(MHFBEAM))
100 CONTINUE
ELSE
DO 110 IHR = 1,KHRS
FBEAM(IHR,1) = CALCFBMH(IDATE,ZEN(IHR),RADABV(IHR,1))
! 29/3 FBEAM(IHR,1) = CALCFBMH(IDATE,IHR,ALAT,DEC,RADABV(IHR,1))
! FBEAM(IHR,1) = CALCFBMWN(IDATE,IHR,ZEN(IHR),RADABV(IHR,1))
110 CONTINUE
END IF
! Calculate NIR
CALL CALCNIR(RADABV,FBEAM)
! Calculate FSUN
CALL CALCFSUN(FBEAM,FSUN)
! Calculate thermal radiation
CALL THERMAL(TAIR,VPD,FSUN,RADABV)
! Read in values of CA if present
IF (METCOLS(MHCA).NE.MISSING) THEN
DO 120 IHR = 1,KHRS
CA(IHR) = DATAIN(IHR,METCOLS(MHCA))
120 CONTINUE
ELSE
DO 130 IHR = 1,KHRS
CA(IHR) = CAK
130 CONTINUE
END IF
! Get sOil moisture - either soil water potential or soil moisture deficit
DO 170 IHR = 1,KHRS
SOILMOIST(IHR) = 0.0
170 CONTINUE
SOILDATA = NONE
IF (METCOLS(MHSWP).NE.MISSING) THEN
SOILDATA = POTENTIAL
DO 180 IHR = 1,KHRS
SOILMOIST(IHR) = DATAIN(IHR,METCOLS(MHSWP))
180 CONTINUE
ELSE IF (METCOLS(MHSWC).NE.MISSING) THEN
SOILDATA = DEFICIT
DO 160 IHR = 1,KHRS
SOILMOIST(IHR) = (SWMAX - DATAIN(IHR,METCOLS(MHSWC))) &
/(SWMAX - SWMIN)
160 CONTINUE
END IF
RETURN
END !GetMetHr
!**********************************************************************
SUBROUTINE CALCTHRLY(TMAX,TMIN,DAYL,TAIR)
! Calculate a daily variation in temperature from max & min temperatures.
! Temp varies linearly between sunset & sunrise, and sinusoidally during the day.
! INPUTS:
! TMIN, TMAX - minimum and maximum daily temperatures, °!
! DAYL - daylength, hours
! OUTPUTS:
! TAIR - array of hourly air temperatures, °!
!**********************************************************************
USE maestcom
IMPLICIT NONE
INTEGER I
REAL TAIR(MAXHRS),TMAX,TMIN,DAYL
REAL TAV,TAMPL,HRTIME,TIME
TAV = (TMAX+TMIN)/2.0
TAMPL = (TMAX-TMIN)/2.0
DO 105 I=1,KHRS
HRTIME = I-0.5
TIME = HRTIME + DAYL*0.5 - (KHRS/2.0)
IF (TIME.LT.0.0.OR.TIME.GT.DAYL) THEN
IF (TIME.LT.0.0) HRTIME=HRTIME+KHRS
TAIR(I) = TAV - (TAV-TMIN)*(HRTIME-DAYL*0.5-(KHRS/2.0))/ &
(KHRS-DAYL)
ELSE
TAIR(I) = TAV - TAMPL*COS(1.5*PI*TIME/DAYL)
ENDIF
105 CONTINUE
RETURN
END !CalcTHrly
!**********************************************************************
SUBROUTINE CALCTSOIL(TAIR,TSOIL)
! Calculate soil temperatures.
! Set equal to average daily air temperature.
! INPUTS:
! TAIR - array of hourly air temperatures, °!
! OUTPUTS:
! TSOIL - array of hourly soil temperatures, °!
!**********************************************************************
USE maestcom
IMPLICIT NONE
INTEGER I
REAL TSOIL(MAXHRS),TAIR(MAXHRS)
REAL TAV
TAV = 0.0
DO 10 I = 1,KHRS
TAV = TAV + TAIR(I)
10 CONTINUE
TAV = TAV/REAL(KHRS)
DO 20 I = 1,KHRS
TSOIL(I) = TAV
20 CONTINUE
RETURN
END !CalcTSoil
!
!**********************************************************************
SUBROUTINE ASSIGNRAIN(TOTAL,PPT)
! Given daily total of PPT, assign to hours through the day.
! Use algorithm from GRAECO (model of D. Loustau).
!**********************************************************************
! USE MSFLIB ! Library required by COMPAQ VISUAL FORTRAN - superseded
!USE IFPORT ! Library required by Intel Visual Fortran
USE maestcom
IMPLICIT NONE
INTEGER IHR,IRAIN,IHRSWITHRAIN,I
INTEGER(4) IFLAG
REAL PPT(MAXHRS) ! Hourly rainfall: assume already set to zero
REAL TOTAL,RAIN,RATE,RANNUM
! CALL SEED(1995) ! For testing - same random numbers - change to 0 later.
! CALL RANDOM_SEED ()
IFLAG = 0
! 1. All rain falls in one hour for light storms (<2 mm)
IF (TOTAL.LE.2.) THEN
! RANNUM = RANDOM(IFLAG) ! randomly select hour
CALL RANDOM_NUMBER(RANNUM) ! randomly select hour
IRAIN = INT(RANNUM*KHRS)+1
PPT(IRAIN) = TOTAL
! 2. All rain falls in 24 hours for storms >46 mm
ELSE IF (TOTAL.GT.46.) THEN
RAIN = TOTAL/REAL(KHRS)
DO 10 IHR = 1,KHRS
PPT(IHR) = RAIN
10 CONTINUE
! 3. All rain falls at 2mm/hour at a random time of the day */
ELSE
IHRSWITHRAIN = MIN(INT((TOTAL/2)*KHRS/24),KHRS)
RATE = TOTAL/REAL(IHRSWITHRAIN)
DO 20 I = 1, IHRSWITHRAIN
! RANNUM = RANDOM(IFLAG) ! randomly select hours
CALL RANDOM_NUMBER(RANNUM)
IRAIN = INT(RANNUM*KHRS)+1
PPT(IRAIN) = PPT(IRAIN)+RATE
20 CONTINUE
END IF
! Convert from mm to mmol m-2
DO 30 IHR = 1, KHRS
PPT(IHR) = PPT(IHR)*1E6/18.
30 CONTINUE
RETURN
END !AssignRain
!**********************************************************************
SUBROUTINE CALCRH(TMIN,TAIR,RH)
! Calculate hourly relative humidity from air temperature and minimum
! daily temperature (assumed to be the dewpoint).
! INPUTS:
! TMIN - daily minimum temperature, °!
! TAIR - array of hourly air temperatures, °!
! OUTPUTS:
! RH - array of hourly relative humidity, fraction
!**********************************************************************
USE maestcom
IMPLICIT NONE
INTEGER I
REAL TAIR(MAXHRS),RH(MAXHRS),TMIN,HUMABS
REAL, EXTERNAL :: SATUR
HUMABS = SATUR(TMIN)
DO 10 I = 1,KHRS
RH(I) = HUMABS/SATUR(TAIR(I))
10 CONTINUE
RETURN
END !CalcRH
!**********************************************************************
SUBROUTINE RHTOVPD(RH,TAIR,VPD)
! Convert from RH to VPD.
! Inputs: RH(MAXHRS) - hourly relative humidity, fraction
! TAIR(MAXHRS) - hourly air temperature, degrees !
! Outputs: VPD(MAXHRS) - hourly VPD, Pa
!**********************************************************************
USE maestcom
IMPLICIT NONE
INTEGER I
REAL TAIR(MAXHRS),RH(MAXHRS),VPD(MAXHRS)
REAL, EXTERNAL :: SATUR
DO 10 I = 1,KHRS
VPD(I)=(1.0-RH(I))*SATUR(TAIR(I))
10 CONTINUE
RETURN
END !RHToVPD
!**********************************************************************
SUBROUTINE VPDTORH(VPD,TAIR,RH)
! Convert from VPD to RH.
! Inputs:
! VPD(MAXHRS) - hourly VPD, Pa
! TAIR(MAXHRS) - hourly air temperature, degrees !
! Outputs:
! RH(MAXHRS) - hourly relative humidity, fraction
!**********************************************************************
USE maestcom
IMPLICIT NONE
INTEGER I
REAL TAIR(MAXHRS),RH(MAXHRS),VPD(MAXHRS)
REAL, EXTERNAL :: SATUR
DO 10 I = 1,KHRS
RH(I) = 1.0 - VPD(I)/SATUR(TAIR(I))
10 CONTINUE
RETURN
END !VPDToRH
!**********************************************************************
SUBROUTINE TDEWTORH(TDEW,TAIR,RH)
! Convert from TDEW to RH.
! Inputs:
! TDEW(MAXHRS) - hourly dewpoint temperature, degrees !
! TAIR(MAXHRS) - hourly air temperature, degrees !
! Outputs:
! RH(MAXHRS) - hourly relative humidity, fraction