Changes between Version 26 and Version 27 of Documentation/UserGuide/PresentDay

Timestamp:

2020-02-28T17:25:03+01:00 (4 years ago)

Author:

luyssaert

Comment:

--

Documentation/UserGuide/PresentDay

@@ -5 +5 @@
 Last minor revision: S.Luyssaert (2020/02/28) [[BR]]
 
+== Objective ==
+Background of this set-up: The aim is to run a 20 year long equilibrium simulation for the year 2011. Orchidee off-line line was used to simulate the surface area in 2011 and now we want to know how the climate looked liked for such a surface. The coupled run is zoomed over Europe, nudged at the edges of Europe uses the CWRR (a.k.a. 11-layer) hydrology and all the DOFOCO features. A set of coupled pre-industrial runs demonstrated that the net-radiation at the top of the atmosphere was close to zero (0.2 Wm2 over 15 years with a monthly std 5.4 Wm2 for a pmagic = 0.000). 
+
+Before setting up a present day simulation, a pre-industrial run will be required to check the radiation balance at the top of the atmosphere. You can find some extra information on the topic at http://forge.ipsl.jussieu.fr/orchidee/wiki/Documentation/VerifyClimate. The basic idea is that for a pre-industrial run the net radiation at the top of the atmosphere should be close to zero. If this is not the case then the albedo of the oceans can be adjusted to mimic several atmospheric processes which are not accounted for. The setting of the variable pmagic that was required to produce a pre-industrial run with zero net-radiation at the top of the atmosphere is also the value for pmagic that needs to used in the present day simulation.
+
 The page follows the workflow of [wiki:Documentation/UserGuide/LMDZOR] and [wiki:Documentation/SetupZoomEurope]. For the commands and actions consult those pages. On this page the settings are specified.
  
-
-== Objective ==
-Background of this set-up: The aim is to run a 20 year long equilibrium simulation for the year 2011. Orchidee off-line line was used to simulate the surface area in 2011 and now we want to know how the climate looked liked for such a surface. The coupled run is zoomed over Europe, nudged at the edges of Europe uses the CWRR (a.k.a. 11-layer) hydrology and all the DOFOCO features. A set of coupled pre-industrial runs demonstrated that the net-radiation at the top of the atmosphere was close to zero (0.2 Wm2 over 15 years with a monthly std 5.4 Wm2 for a pmagic = 0.000). 
-
-Before setting up a present day simulation, a pre-industrial run will be required to check the radiation balance at the top of the atmosphere. You can find some extra information on the topic at http://forge.ipsl.jussieu.fr/orchidee/wiki/Documentation/VerifyClimate. The basic idea is that for a pre-industrial run the net radiation at the top of the atmosphere should be close to zero. If this is not the case then the albedo of the oceans can be adjusted to mimic several atmospheric processes which are not accounted for. The setting of the variable pmagic that was required to produce a pre-industrial run with zero net-radiation at the top of the atmosphere is also the value for pmagic that needs to used in the present day simulation. 
+ 
 
 == The boundary conditions ==