Changes between Version 32 and Version 33 of DevelopmentActivities/CMIP6/DevelopmentsCMIP6/soil_physic

Timestamp:

2015-02-27T15:43:15+01:00 (9 years ago)

Author:

peylin

Comment:

--

DevelopmentActivities/CMIP6/DevelopmentsCMIP6/soil_physic

@@ -347 +347 @@
  - the scheme of Isabelle Goutevin has been implemented in the TRUNC.
  - As for energy conservation the scheme buffers the energy released during freezing for all layers, then calculates the consumed energy during the next thawing period. If the the two energy do not match she distribute the excess/deficit of energy by re-adjusting the Temperatures of the whole soil profile. There is thus only energy conservation throughout the season (see email above by Isabelle). She could not do it per layers as with the old snow scheme the depth of the layers varies in time.
- - With the new snow scheme we can envisage a new scheme that could conserve the energy each day or time step and possibly for each layer. To be discussed.
-
-
-=== PROPOSED SCHEME ===
+ - With the new snow scheme we can envisage a new scheme that could conserve the energy each day or time step and possibly for each layer. To be discussed; but we will first use the scheme of IG as it is (for CMIP6).
+
+
+=== Proposed Scheme ===
 
 The objective is to propose a scheme flexible enough to allow users to test different configurations depending on their objectives and to be able to account for deep soil thermic representation in the case of permafrost.
 
-Scheme: [https://forge.ipsl.jussieu.fr/orchidee/attachment/wiki/Meetings/CMIP6/Physic/soil_discretization.pptx][[BR]]
+Scheme (to be improved by all...): [https://forge.ipsl.jussieu.fr/orchidee/attachment/wiki/Meetings/CMIP6/Physic/soil_discretization.pptx][[BR]]
 
 The main principles are:
- - The T scheme is always as depth or deeper than the W scheme
- - W and T share the same common discretization for the common part: the layers are the same; For the nodes:  W has the firt node at the surface while T has it at the middle of the first layer; Else they have the same node position
+ - The T scheme is always as depth or deeper than the W scheme.
+ - We plan already a scheme that can account for large depth needed for permafrost in particular (more than 50 m)
+ - W and T share the same common discretization for the common part: the layers are the same; For the nodes: W has the firt node at the surface while T has it at the middle of the first layer; Else they have the same node position; Exception may also concern the bottom of W scheme: should we use Ti at the same level (bottom of the layer) ?
  - The upper part of the scheme follow a geometric discretization of reason 2 (like the current W scheme)
  - Below a certain depth, depth_lin, we have for the W and T a linear discretization, with the depth of each layers equal to that of the lowest layer of the "geometrical part" of the scheme. Note that depth_lin may be equal to depth max with thus no linear discretization section.
  - Below another depth, depth_geom, we have again the geometrical discretization with a reason xx to be defined. This allows to model a deep soil for permafrost modelling. Note that Depth_geom may also be equal to depth_max with thus no bottom geometrical discretization.
+ - For the NUTRIENTS cycles, we will adopt a principle: always gather the existing layers to define a new vertical discretization adapted for C/N/P cycles.
 
 The list of parameters to define the scheme would be:
@@ -385 +387 @@
 == Snow coupling ==
 
-- Presentation by Fuxing of his work on the soil W and T discretization: [https://forge.ipsl.jussieu.fr/orchidee/attachment/wiki/Meetings/CMIP6/Physic/Orchidee_snow_CMIP6.pdf​​][[BR]]
-
+=== Presentation by Catherine and Tao (MICT version) === 
+
+We had time only for a short presentation of the new snow module implementation: [https://forge.ipsl.jussieu.fr/orchidee/attachment/wiki/Meetings/CMIP6/Physic/Orchidee_snow_CMIP6.pdf​​][[BR]]
+
+Some features :
+
+ - the number of layers of snow module (ES) is always 3
+ - when there is a snow fall the whole grid is covered by snow ; only the albedo is calculated with a fractional snow cover (standard linear fractional cover)
+ - 
+ - With the coupled simulation, Tao had to define a minimum snow depth (1 cm ?) to avoid "crashes"
+
+=== Discussion ===
  
 
-
-
+== PROPOSED ACTIONS ==
+
+ - Tao and
+ - 
+ - Snow Scheme
+  - Josefine with Tao implement  
+