Difference between revisions of "ACCESS-ESM-PMIP4"
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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 '''/short/public/access-esm/payu/bin/coe/um_hg3.exe-20190412-pmip-r327''' (where the r327 stands for the revision number in the subversion repository). | 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 '''/short/public/access-esm/payu/bin/coe/um_hg3.exe-20190412-pmip-r327''' (where the r327 stands for the revision number in the subversion repository). | ||
+ | |||
== Mid-Holocene == | == Mid-Holocene == | ||
Line 127: | Line 128: | ||
| '''CO2''' | | '''CO2''' | ||
| 4.314801e-04 | | 4.314801e-04 | ||
− | | | + | | 264.4 ppm |
| 4.0167e-4 | | 4.0167e-4 | ||
|- | |- | ||
| '''CH4''' | | '''CH4''' | ||
| 4.470459e-07 | | 4.470459e-07 | ||
− | | | + | | 597 ppb |
| 3.3061e-07 | | 3.3061e-07 | ||
|- | |- | ||
| '''N2O''' | | '''N2O''' | ||
| 4.143596e-07 | | 4.143596e-07 | ||
− | | | + | | 262 pbb |
| 3.9805e-07 | | 3.9805e-07 | ||
|} | |} | ||
− | These values are set in the payu control directory, under | + | 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 ==== | ==== Orbital ==== | ||
Line 174: | Line 175: | ||
|} | |} | ||
− | 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'''. | + | 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 | + | 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>/short/public/access-esm/payu/bin/coe/um_hg3.exe-20190717-pmip-mh-r335</tt>''' (with 335 being the revision in the repository above). |
Revision as of 20:42, 16 July 2019
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 /short/public/access-esm/payu/bin/coe/um_hg3.exe-20190412-pmip-r327 (where the r327 stands for the revision number in the subversion repository).
Mid-Holocene
The configuration parameters for the Last Interglacial (LIG) 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 /short/public/access-esm/payu/bin/coe/um_hg3.exe-20190717-pmip-mh-r335 (with 335 being the revision in the repository above).