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pmip3:design:li:index [2010/07/01 21:02] lunt |
pmip3:design:li:index [2010/09/16 12:33] (current) jypeter Added link to final BC page in the top warning |
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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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====== Last Interglacial Experimental Design ====== | ====== Last Interglacial Experimental Design ====== | ||
- | <note warning>**Page in progress**: this is not the final version!\\ \\ Use the [[index#page_bottom_tag|discussion]] panel at the end of the page for comments </note> | + | <note warning>This was a BC //development page// (see [[index#page_bottom_tag|discussion]] panel at the end of the page)\\ \\ Make sure you use the [[pmip3:design:li:final|final version of the LI BC]]!</note> |
===== 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. (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 | | | ||
+ | | Ice sheets | Same as PI | | | ||
+ | | Topography and coastlines | Same as PI | | | ||
+ | |||
+ | Please use the [[index#page_bottom_tag|discussion]] panel to **comment** this table! | ||
+ | |||
+ | ==== Transient 8ka-2ka (EXTRA) ==== | ||
+ | |||
+ | ^ ^ 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 Values are given for 10-0ka. | | | ||
+ | | 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 Values are given for 10-0ka. | | | ||
+ | | Aerosols | Same as PI | | | ||
+ | | | | | | ||
+ | | 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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==== Notes ==== | ==== Notes ==== | ||
- | * Trace gas information was obtained from ice core data, all on the EDC3 chronology. For more information (including figures) and details (including IDL code) of the interpolation, please see the webpage below (the interpolation method used for the snapshot values is method 2, see the 'readme' file) \\ | + | * Trace gas information was obtained from ice core data, all on the EDC3 chronology. For more information (including figures) and details (including IDL code) of the interpolation, please see the webpage below (including a readme file) \\ |
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 ===== |