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pmip3:design:li:index [2010/07/01 21:54] lunt |
pmip3:design:li:index [2010/09/15 14:33] jypeter Closed the discussion, before creating the li:final page |
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~~ODT~~ | ~~ODT~~ | ||
- | ~~DISCUSSION~~ | + | ~~DISCUSSION:closed~~ |
<html><a name="page_top_tag"> </a></html> | <html><a name="page_top_tag"> </a></html> | ||
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===== Goal ===== | ===== Goal ===== | ||
- | Run **early Eemian**, **mid-Eemian** and **glacial inception** snap shots. This will allow us to model the response to obliquity maximum (//130ka//) and minimum (//115ka//), and near precession optimum for ITCZ shift, ENSO and tropical monsoons (//125ka//) | + | Run **early Eemian**, **mid-Eemian** and **glacial inception** snap shots. This will allow us to model the high latitude response to obliquity maximum (//130ka//) and minimum (//115ka//), and near precession optimum for ITCZ shift, ENSO and tropical monsoons (//125ka//) |
==== Core experiments ==== | ==== Core experiments ==== | ||
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* 128ka | * 128ka | ||
* repeat core and 128ka experiments with equivalent ocean-atmosphere-**vegetation** models | * repeat core and 128ka experiments with equivalent ocean-atmosphere-**vegetation** models | ||
- | * repeat 130ka experiment with a higher value of CO2, to account for possible dating uncertainties and to assess the impact of the relatively low CO2 in the core experiment. | + | * repeat 130ka experiment with a higher value of CO2, to account for possible dating uncertainties and to assess the impact of the relatively low CO2 in the core experiment. (contact Bette Otto-Bliesner if interested) |
* Ice-sheet reconstruction sensitivity | * Ice-sheet reconstruction sensitivity | ||
- | * Reduced Greenland ice-sheet, possibly using the model reconstruction of Otto-Bliesner et al (2006) | + | * Reduced Greenland ice-sheet, possibly using the model reconstruction of Otto-Bliesner et al (2006) (contact Bette Otto-Bliesner if interested). |
- | * Reduced West Antarctic ice-sheet | + | * Reduced West Antarctic ice-sheet (contact Bette Otto-Bliesner if interested). |
- | * transient interglacial simulations: 130-125ka (or 130-115ka). Either low resolution model or GCM with accelerated boundary conditions, using transient orbit and trace gases | + | * transient interglacial simulations: 130-125ka (or 130-115ka). Either low resolution model or GCM with accelerated boundary conditions, using transient orbit and trace gases (contact Dan Lunt if interested). |
- | * transient holocene simulations: 8-2ka (or 8-0ka). Either low resolution model or GCM with accelerated boundary conditions, using transient orbit and trace gases | + | * transient holocene simulations: 8-2ka (or 8-0ka). Either low resolution model or GCM with accelerated boundary conditions, using transient orbit and trace gases (contact Dan Lunt if interested). |
+ | * transient and snapshot simulations with variable solar forcing (contact Hans Renssen and/or Steven Phipps if interested) | ||
===== Boundary conditions ===== | ===== Boundary conditions ===== | ||
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| Aerosols | Same as PI | | | | Aerosols | Same as PI | | | ||
| | | | | | | | | | ||
- | | Solar constant | 1365 W/m<sup>2</sup> | | | + | | Solar constant | 1365 W/m<sup>2</sup> | As in PI | |
| Vegetation | Pre-industrial fixed | | | | Vegetation | Pre-industrial fixed | | | ||
| Ice sheets | Same as PI | | | | Ice sheets | Same as PI | | | ||
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| Aerosols | Same as PI | | | | Aerosols | Same as PI | | | ||
| | | | | | | | | | ||
- | | Solar constant | 1365 W/m<sup>2</sup> | | | + | | Solar constant | 1365 W/m<sup>2</sup> | As in PI | |
| Vegetation | Pre-industrial fixed | | | | Vegetation | Pre-industrial fixed | | | ||
| Ice sheets | Same as PI | | | | Ice sheets | Same as PI | | | ||
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| Aerosols | Same as PI | | | | Aerosols | Same as PI | | | ||
| | | | | | | | | | ||
- | | Solar constant | 1365 W/m<sup>2</sup> | | | + | | Solar constant | 1365 W/m<sup>2</sup> | As in PI | |
| Vegetation | Pre-industrial fixed | | | | Vegetation | Pre-industrial fixed | | | ||
| Ice sheets | Same as PI | | | | Ice sheets | Same as PI | | | ||
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| Aerosols | Same as PI | | | | Aerosols | Same as PI | | | ||
| | | | | | | | | | ||
- | | Solar constant | 1365 W/m<sup>2</sup> | | | + | | Solar constant | 1365 W/m<sup>2</sup> | As in PI | |
| Vegetation | Pre-industrial fixed | | | | Vegetation | Pre-industrial fixed | | | ||
| Ice sheets | Same as PI | | | | Ice sheets | Same as PI | | | ||
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^ ^ PMIP3 ^ Alternative solution ^ | ^ ^ PMIP3 ^ Alternative solution ^ | ||
- | | Orbital parameters | varying, model interpolates values given on a 1k resolution. See values here: http://www.paleo.bris.ac.uk/~ggdjl/pmip/orbit_pmip.out | | | + | | Orbital parameters | varying, model interpolates values given on a 1k resolution. See values here: http://www.paleo.bris.ac.uk/~ggdjl/pmip/orbit_pmip.out Values are given for 132-115ka. | | |
| Date of vernal equinox | March 21 at noon | | | | Date of vernal equinox | March 21 at noon | | | ||
- | | Trace gases | varying, model interpolates values given on a 0.1k resolution. See values here: http://www.paleo.bris.ac.uk/~ggdjl/pmip/pmip_hol_lig_gases.txt | | | + | | Trace gases | varying, model interpolates values given on a 0.1k resolution. See values here: http://www.paleo.bris.ac.uk/~ggdjl/pmip/pmip_hol_lig_gases.txt Values are given for 132-115ka. | | |
| Aerosols | Same as PI | | | | Aerosols | Same as PI | | | ||
| | | | | | | | | | ||
- | | Solar constant | 1365 W/m<sup>2</sup> | | | + | | Solar constant | 1365 W/m<sup>2</sup> | As in PI | |
| Vegetation | Pre-industrial fixed | | | | Vegetation | Pre-industrial fixed | | | ||
| Ice sheets | Same as PI | | | | Ice sheets | Same as PI | | | ||
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^ ^ PMIP3 ^ Alternative solution ^ | ^ ^ PMIP3 ^ Alternative solution ^ | ||
- | | Orbital parameters | varying, model interpolates values given on a 1k resolution. See values here: http://www.paleo.bris.ac.uk/~ggdjl/pmip/orbit_pmip.out | | | + | | Orbital parameters | varying, model interpolates values given on a 1k resolution. See values here: http://www.paleo.bris.ac.uk/~ggdjl/pmip/orbit_pmip.out Values are given for 10-0ka. | | |
| Date of vernal equinox | March 21 at noon | | | | Date of vernal equinox | March 21 at noon | | | ||
- | | Trace gases | varying, model interpolates values given on a 0.1k resolution. See values here: http://www.paleo.bris.ac.uk/~ggdjl/pmip/pmip_hol_lig_gases.txt | | | + | | Trace gases | varying, model interpolates values given on a 0.1k resolution. See values here: http://www.paleo.bris.ac.uk/~ggdjl/pmip/pmip_hol_lig_gases.txt Values are given for 10-0ka. | | |
| Aerosols | Same as PI | | | | Aerosols | Same as PI | | | ||
| | | | | | | | | | ||
- | | Solar constant | 1365 W/m<sup>2</sup> | | | + | | Solar constant | 1365 W/m<sup>2</sup> | As in PI | |
| Vegetation | Pre-industrial fixed | | | | Vegetation | Pre-industrial fixed | | | ||
| Ice sheets | Same as PI | | | | Ice sheets | Same as PI | | | ||
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http://www.paleo.bris.ac.uk/~ggdjl/pmip | http://www.paleo.bris.ac.uk/~ggdjl/pmip | ||
* Orbital values from Berger (1978). Calculated using B78 fortran code downloadable from http://www.astr.ucl.ac.be/index.php?page=AstronomicalInsolationForcing | * Orbital values from Berger (1978). Calculated using B78 fortran code downloadable from http://www.astr.ucl.ac.be/index.php?page=AstronomicalInsolationForcing | ||
+ | * Some models may calculate their own orbital parameters internally, which is fine. | ||
+ | * For accelerated simulations, the trace gases and orbits are identical to the non-accelerated simulations, but have a smaller timestep. | ||
===== Initial conditions ===== | ===== Initial conditions ===== | ||
+ | |||
+ | For snapshots: | ||
^ ^ PMIP3 ^ Alternative solution ^ | ^ ^ PMIP3 ^ Alternative solution ^ | ||
- | | Initial conditions | Branch off PI after adjustement | Same as in PI | | + | | Initial conditions | Branch off PI after adjustment | Same as in PI | |
| Model spin up | Same as in PI | | | | Model spin up | Same as in PI | | | ||
+ | |||
+ | For transients: | ||
+ | |||
+ | ^ ^ PMIP3 ^ Alternative solution ^ | ||
+ | | Initial conditions | Branch off PI after adjustment | Same as in PI | | ||
+ | | Model spin up | 2kyr or less before transient starts | Same as in PI | | ||
+ | |||
+ | For initial conditions, and especially spinup, the key thing is to document what you do! | ||
+ | |||
+ | For the transient simulations, orbits and trace gas values are given for up to 2ky before the start date of the simulation. | ||
===== Participating groups ===== | ===== Participating groups ===== |