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pmip3:design:li:index [2010/07/02 00:11] – luntpmip3:design:li:index [2010/09/16 14:33] (current) – Added link to final BC page in the top warning jypeter
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 ~~ODT~~ ~~ODT~~
-~~DISCUSSION~~+~~DISCUSSION:closed~~
  
 <html><a name="page_top_tag">&nbsp</a></html> <html><a name="page_top_tag">&nbsp</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.+  * 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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 ^      ^   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  | |
 |    | |  | |    | |  |
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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 =====
pmip3/design/li/index.1278022310.txt.gz · Last modified: 2010/07/02 00:11 by lunt
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