Changes between Version 3 and Version 4 of DevelopmentActivities/CMIP6/DevelopmentsCMIP6/soil_physic

Timestamp:

2015-02-06T13:05:33+01:00 (9 years ago)

Author:

aducharne

Comment:

--

DevelopmentActivities/CMIP6/DevelopmentsCMIP6/soil_physic

@@ -18 +18 @@
 === Discussions ===
 
-'''Jan Polcher, 13/01/15'''
+'''Jan Polcher, 13/01/15 (mail)'''
 
 après notre discussion cet après-midi j'ai un peu réfléchi à comment "merger" les 4 points de Philippe dans le trunk, tout en permettant à tout le monde de suivre ce qui se passe et donc de construire une confiance commune dans ces changements.
@@ -35 +35 @@
 Pour réaliser ce plan je suis disposé à travailler avec Fuxing et Thao sur les étapes 1 et 2. Je ne peux pas quantifier le travail pour chaque étape, mais une semaine me semble un bon first-guess. Je pense que pour la neige ce sera un peu plus long. Mais comme cela vient en second on peut préparer les choses en amont. 
 
-'''Philipe Peylin, 17/01/15'''
+'''Philipe Peylin, 17/01/15 (mail)'''
 
 Concernant la proposition de Jan:
@@ -41 +41 @@
 - Ensuite pour le point 2 et 4, personnellement j'aurais traiter cela ensemble (mais je ne suis pas le plus compétent pour juger de l'intéret de séparer)
 
-'''Agnès Ducharne, 23/01/15'''
+'''Agnès Ducharne, 23/01/15 (mail)'''
 
 My opinion is that the main challenges are :[[BR]]
@@ -89 +89 @@
 (3) 1st layer depth It is 1cm for the 1st soil layer in ISBA. A. BOONE's opinion is that the 1mm soil depth is too thin, and A. BOONE's suggested it better to use at least 1 cm for the 1st layer.
 
-'''Jan Polcher, 26/01/15''' to Agnès 23/01/15
+'''Jan Polcher, 26/01/15 (mail)''' to Agnès 23/01/15
 
 thank you for this analysis ... which I totally share. I will give you my feeling on a few of the points you raise :
@@ -108 +108 @@
 For the snow, I am still waiting to see the equations to be used to coupled the bottom temperature of snow pack with the one of the soil. Once we have all the equations of the temperature diffusion (from the skin temperature to the bottom of the soil and through the snow pack) in implicit form, things should flow smoothly.
 
-'''Fuxing Wang, 26/01/15'''
+'''Fuxing Wang, 26/01/15 (mail)'''
 
 (1) The depth. This should be configurable by the user as different applications will have different needs. We should code things so that each one can test the configuration which suits him/her best.
@@ -124 +124 @@
 The bottom positions from top 4st to 6th layers are : 2.151cm, 4.497cm, 9.189cm.
 
-'''Frédérique Cheruy, 27/01/15'''
+'''Frédérique Cheruy, 27/01/15 (mail)'''
 
 ''About the optimal vertical discretization for W and T''[[BR]]
@@ -143 +143 @@
 Whoever will work on that subject,  it would be good to know if the bare soil albedo maps prepared by Sebastian and team can be directly pluged into Orchidee-trunk or if we need to see with ISBA people, or to redo the work ourselves.
 
-'''Jan Polcher, 27/01/15''' to F. Chéruy, 27/01/15
+'''Jan Polcher, 27/01/15 (mail)''' to F. Chéruy, 27/01/15
 
 Je suis d'accord avec toi qu'il faudra définir la "configurabilité" des niveaux verticaux en fonction des différentes contraintes. Le nombre de nivaux sera sans doute un résultat plutôt qu'un paramètre.
@@ -151 +151 @@
 C'est la même chose qui est fait dans LMDZ au pôle ! 
 
+'''Jan Polcher, 06/02/15 (mail)'''
 
+I have given it some thought on how to specify the parameter in order to choose the common levels between hydrol and thermosoil.
+
+In order to see what works best from a user point of view, I have written a simple python script to select the properties of the vertical discretisation and plot the result. The 4 parameters I propose for the moment are :[[BR]]
+Depth of top hydrology layer [9.77517107e-04 m] >[[BR]]
+Depth of hydrology [2.0m] >[[BR]]
+Depth at which linear hydrology layers start [0.75 m] >[[BR]]
+Depth of thermodynamics [8.0m] >[[BR]]
+in [] are the default values you can if you do not enter anything to the script and which produce a result very similar to what we have today.
+Attached is also the plot produced by the script.
+
+There is still the open question if we need a vertical filter for the top layer of thermosoil, and if so we need to specify the filtering depth.
+
+So please play with this and see if these are the parameters which are best suited for ORCHIDEE or if we should change some.
+
+The way I have coded the calculation of the vertical levels and number of layer in Python, are very FORTRAN like. So once we agree it should be easy to put that into a module of ORCHIDEE and test again if we need or not a numerical filter.
+
+So once we agree on the choice it can be implemented in the trunk. 
 === Agreed actions and Agenda ===