Difference between revisions of "ACCESS-ESM-PMIP4"
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− | = ACCESS-ESM Last Interglacial = | + | = ACCESS-ESM PMIP4 = |
+ | |||
+ | == Last Interglacial == | ||
The configuration parameters for the Last Interglacial (LIG) should follow the experiment setup in [https://pmip4.lsce.ipsl.fr/doku.php/exp_design:lig127 LIG Design]. | The configuration parameters for the Last Interglacial (LIG) should follow the experiment setup in [https://pmip4.lsce.ipsl.fr/doku.php/exp_design:lig127 LIG Design]. | ||
Line 6: | Line 8: | ||
The configuration for the Last Interglacial Model of ACCESS-ESM is based on the payu version of ACCESS-ESM piControl, and can be found on [https://github.com/coecms/esm-lig GitHub:coecms/esm-lig] | The configuration for the Last Interglacial Model of ACCESS-ESM is based on the payu version of ACCESS-ESM piControl, and can be found on [https://github.com/coecms/esm-lig GitHub:coecms/esm-lig] | ||
− | == Differences between piControl and LIG == | + | === Differences between piControl and LIG === |
The differences between piControl and LIG fall in two categories: | The differences between piControl and LIG fall in two categories: | ||
− | === Atmospheric === | + | ==== Atmospheric ==== |
Some concentrations are different between piControl and LIG: | Some concentrations are different between piControl and LIG: | ||
Line 35: | Line 37: | ||
These values are set in the payu control directory, under {{atmosphere/namelists}}, with the variable names '''CO2_MMR''', '''CH4MMR''', and '''N2OMMR''', respectively. Since ACCESS-ESM expects these values to be in Mass-Mixing Ratio, the desired values have to be converted from ppm/ppb to MMR. | These values are set in the payu control directory, under {{atmosphere/namelists}}, with the variable names '''CO2_MMR''', '''CH4MMR''', and '''N2OMMR''', respectively. Since ACCESS-ESM expects these values to be in Mass-Mixing Ratio, the desired values have to be converted from ppm/ppb to MMR. | ||
− | === | + | ==== Orbital ==== |
The path of earth around the sun has changed since the last interglacial, so changes have to be accommodated. | The path of earth around the sun has changed since the last interglacial, so changes have to be accommodated. | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
− | The values were changed to the new values, checked into the repository at [https://access-svn.nci.org.au/svn/cmip5/branches/dev/hxw599/pmip https://access-svn.nci.org.au/svn/cmip5/branches/dev/hxw599/pmip], and compiled into the executable '''/ | + | The values were changed to the new values, checked into the repository at [https://access-svn.nci.org.au/svn/cmip5/branches/dev/hxw599/pmip https://access-svn.nci.org.au/svn/cmip5/branches/dev/hxw599/pmip], and compiled into the executable '''/g/data/access/payu/access-esm-pmip/pmip-li/bin/um_hg3_20200706_pmip-li_r344.exe''' (where the r344 stands for the revision number in the subversion repository). |
+ | |||
+ | |||
+ | |||
+ | == Mid-Holocene == | ||
+ | |||
+ | The configuration parameters for the Mid Holocene (MH) should follow the experiment setup in [https://pmip4.lsce.ipsl.fr/doku.php/exp_design:mh Mid Holocene Dsign]. | ||
+ | |||
+ | The configuration for the Last Interglacial Model of ACCESS-ESM is based on the payu version of ACCESS-ESM piControl, and can be found on [https://github.com/coecms/esm-mh GitHub:coecms/esm-mh] | ||
+ | |||
+ | === Differences between piControl and MH === | ||
+ | |||
+ | The differences between piControl and MH fall in two categories: | ||
+ | |||
+ | ==== Atmospheric ==== | ||
+ | |||
+ | Some concentrations are different between piControl and LIG: | ||
+ | |||
+ | {| border="1" cellpadding="1" cellspacing="1" style="width: 500px;" | ||
+ | |- | ||
+ | | '''Molecule''' | ||
+ | | '''pIControl (MMR)''' | ||
+ | | '''MH''' | ||
+ | | '''MH (MMR)''' | ||
+ | |- | ||
+ | | '''CO2''' | ||
+ | | 4.314801e-04 | ||
+ | | 264.4 ppm | ||
+ | | 4.0167e-4 | ||
+ | |- | ||
+ | | '''CH4''' | ||
+ | | 4.470459e-07 | ||
+ | | 597 ppb | ||
+ | | 3.3061e-07 | ||
+ | |- | ||
+ | | '''N2O''' | ||
+ | | 4.143596e-07 | ||
+ | | 262 pbb | ||
+ | | 3.9805e-07 | ||
+ | |} | ||
+ | |||
+ | These values are set in the payu control directory, under atmosphere/namelists, with the variable names '''CO2_MMR''', '''CH4MMR''', and '''N2OMMR''', respectively. Since ACCESS-ESM expects these values to be in Mass-Mixing Ratio, the desired values have to be converted from ppm/ppb to MMR. | ||
+ | |||
+ | ==== Orbital ==== | ||
+ | |||
+ | The path of earth around the sun has changed since the last interglacial, so changes have to be accommodated. | ||
+ | |||
+ | {| border="1" cellpadding="1" cellspacing="1" style="width: 500px;" | ||
+ | |- | ||
+ | | '''Parameter''' | ||
+ | | '''pIControl''' | ||
+ | | '''MH''' | ||
+ | |- | ||
+ | | eccentricity | ||
+ | | 1.6710222E-02 | ||
+ | | 0.018682 | ||
+ | |- | ||
+ | | obliquity | ||
+ | | 0.409092804 | ||
+ | | 24.105 x pi/180 | ||
+ | |- | ||
+ | | perihelion-180° | ||
+ | | 102.94719*PI/180.0 | ||
+ | | 0.87 x pi/180 | ||
+ | |- | ||
+ | | Date of vernal equinox | ||
+ | | March 21 at noon | ||
+ | | March 21 at noon | ||
+ | |- | ||
+ | | Time of parahelion passage in days | ||
+ | | 2.667 | ||
+ | | 260.903 | ||
+ | |} | ||
+ | |||
+ | These specifications are hardcoded in the UM (at least in version 7.3 which we are using for ACCESS-ESM) in the header file <tt>'''include/constant/astron.h'''</tt>. | ||
+ | |||
+ | A new source repository was created at [https://access-svn.nci.org.au/svn/cmip5/branches/dev/hxw599/pmip-mh https://access-svn.nci.org.au/svn/cmip5/branches/dev/hxw599/pmip-mh] and an executable was created at '''<tt>/g/data/access/payu/access-esm-pmip/pmip-mh/bin/um_hg3_20200706_pmip-mh_r345.exe</tt>''' (with 335 being the revision in the repository above). | ||
+ | |||
+ | [[Category:ACCESS]] [[Category:CMIP6 models and configuration]] |
Latest revision as of 20:06, 7 January 2021
Contents
ACCESS-ESM PMIP4
Last Interglacial
The configuration parameters for the Last Interglacial (LIG) should follow the experiment setup in LIG Design.
The configuration for the Last Interglacial Model of ACCESS-ESM is based on the payu version of ACCESS-ESM piControl, and can be found on GitHub:coecms/esm-lig
Differences between piControl and LIG
The differences between piControl and LIG fall in two categories:
Atmospheric
Some concentrations are different between piControl and LIG:
Molecule | pIControl (MMR) | LIG |
CO2 | 4.314801e-04 | 275 ppm |
CH4 | 4.470459e-07 | 685 ppb |
N2O | 4.143596e-07 | 255 pbb |
These values are set in the payu control directory, under Template:Atmosphere/namelists, with the variable names CO2_MMR, CH4MMR, and N2OMMR, respectively. Since ACCESS-ESM expects these values to be in Mass-Mixing Ratio, the desired values have to be converted from ppm/ppb to MMR.
Orbital
The path of earth around the sun has changed since the last interglacial, so changes have to be accommodated.
Parameter | pIControl | LIG |
eccentricity | 1.6710222E-02 | 0.039378 |
obliquity | 0.409092804 | 24.04° |
perihelion-180° | 102.94719*PI/180.0 | 275.41° |
Date of vernal equinox | March 21 at noon | March 21 at noon |
Time of parahelion passage in days | 2.667 | 170.9046 |
These specifications are hardcoded in the UM (at least in version 7.3 which we are using for ACCESS-ESM) in the header file include/constant/astron.h.
! ! Eccentricity of the orbit
Real, Parameter :: E_DFLT = 1.6710222E-02
!
! ! Longitude of the perihelion in radians
Real, Parameter :: LPH_DFLT = 102.94719*PI/180.0
!
! ! Obliquity of the orbit - corresponds to 23.43929111 degrees
Real, Parameter :: OBLQ_DFLT = 0.409092804
!
! ! Reference year for setting the date of the vernal equinox
Integer, Parameter :: YEAR_REF_VE = 2000
!
! ! Date of the vernal equinox in days after the start of the year
! ! This date is for the year 2000.
Real, Parameter :: DATE_VE_DFLT = 79.3159
!
! The final parameter required is the time of the perihelion
! passage, TAU0. For a pure Keplerian orbit, with a specified
! eccentricity and longitude of the perihelion, this can be
! deduced from the date of the vernal equinox (as is specified
! in AMIP-2, for example). In practice it is somewhat more
! complicated to calculate the time of the perihelion.
! For simplicity, a mean value for the years 1995-2005 is used
! here: note that the range of TAU0 in this period is from
! 1.0 to 3.75 and that there is no simple relationship with leap
! years.
!
! ! Time of the perihelion passage in days
Real, Parameter :: TAU0_DFLT = 2.667
The values were changed to the new values, checked into the repository at https://access-svn.nci.org.au/svn/cmip5/branches/dev/hxw599/pmip, and compiled into the executable /g/data/access/payu/access-esm-pmip/pmip-li/bin/um_hg3_20200706_pmip-li_r344.exe (where the r344 stands for the revision number in the subversion repository).
Mid-Holocene
The configuration parameters for the Mid Holocene (MH) should follow the experiment setup in Mid Holocene Dsign.
The configuration for the Last Interglacial Model of ACCESS-ESM is based on the payu version of ACCESS-ESM piControl, and can be found on GitHub:coecms/esm-mh
Differences between piControl and MH
The differences between piControl and MH fall in two categories:
Atmospheric
Some concentrations are different between piControl and LIG:
Molecule | pIControl (MMR) | MH | MH (MMR) |
CO2 | 4.314801e-04 | 264.4 ppm | 4.0167e-4 |
CH4 | 4.470459e-07 | 597 ppb | 3.3061e-07 |
N2O | 4.143596e-07 | 262 pbb | 3.9805e-07 |
These values are set in the payu control directory, under atmosphere/namelists, with the variable names CO2_MMR, CH4MMR, and N2OMMR, respectively. Since ACCESS-ESM expects these values to be in Mass-Mixing Ratio, the desired values have to be converted from ppm/ppb to MMR.
Orbital
The path of earth around the sun has changed since the last interglacial, so changes have to be accommodated.
Parameter | pIControl | MH |
eccentricity | 1.6710222E-02 | 0.018682 |
obliquity | 0.409092804 | 24.105 x pi/180 |
perihelion-180° | 102.94719*PI/180.0 | 0.87 x pi/180 |
Date of vernal equinox | March 21 at noon | March 21 at noon |
Time of parahelion passage in days | 2.667 | 260.903 |
These specifications are hardcoded in the UM (at least in version 7.3 which we are using for ACCESS-ESM) in the header file include/constant/astron.h.
A new source repository was created at https://access-svn.nci.org.au/svn/cmip5/branches/dev/hxw599/pmip-mh and an executable was created at /g/data/access/payu/access-esm-pmip/pmip-mh/bin/um_hg3_20200706_pmip-mh_r345.exe (with 335 being the revision in the repository above).