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pmip3:design:li:index [2010/07/01 22:11]
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">&​nbsp</​a></​html>​ <​html><​a name="​page_top_tag">&​nbsp</​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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 ^      ^   ​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.txt · Last modified: 2010/09/16 12:33 by jypeter