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--- pmip3:design:li:index [2010/07/01 23:50] – lunt
+++ pmip3:design:li:index [2010/07/29 15:43] – lunt
@@ Line 23: / Line 23: @@
   * 128ka
   * 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
-    * 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 =====
@@ Line 39: / Line 41: @@
 |  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  |    |
@@ Line 54: / Line 56: @@
 |  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  |    |
@@ Line 69: / Line 71: @@
 |  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  |    |
@@ Line 84: / Line 86: @@
 |  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  |    |
@@ Line 94: / Line 96: @@
 ^      ^   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  | |
-|  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  | |
 |    | |  |
-|  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  |    |
@@ Line 109: / Line 111: @@
 ^      ^   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  | |
-|  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  | |
 |    | |  |
-|  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  |    |
@@ Line 126: / Line 128: @@
   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
+  * 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 =====
+For snapshots:
 ^  ^  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  |  |
+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 =====