Changes between Version 11 and Version 12 of DevelopmentActivities/CMIP6/LS3MIP

Timestamp:

2016-12-07T10:45:29+01:00 (7 years ago)

Author:

fcheruy

Comment:

--

DevelopmentActivities/CMIP6/LS3MIP

@@ -46 +46 @@
 Initiated by Olivier Boucher, and followed by Frédérique Cheruy
 
+
+https://docs.google.com/spreadsheets/d/1iZ7F_KBu0kbY1iZ53fMW_QObwQf141kPkxpf6Zj5OvA/edit?usp=sharing
+
+
+https://docs.google.com/spreadsheets/d/1P0D7CIf6782coBppnRCybwfjcg4bkjVmUuqd81gPtWU/edit?usp=sharing
+
+Message de Karl Taylor sur la normalisation des variabes:
+
+All variables are considered to be in a "Category A" except the following Category B variables, which are either:
+
+- intensive in area and quantify the area of a particular type (e.g., sea_ice_area_fraction), or
+- extensive in area (e.g., sea_ice_volume, sea_ice_mass)
+
+The time mean of category A variable is calculated as follows:
+
+Amean = sum_over_time (f_n * H_n) / sum_over_time (f_n)
+
+where n is a time sample and f is the fraction of the cell where H exists.  
+For category B:
+
+Bmean = sum_over_time H_n / N   
+
+where N is the number of time samples.
+
+Note that when H exists over the entire grid cell (i.e., isn't restricted to a portion of the cell), f_n = 1, and Amean = Bmean.
+
+For the cases you mentioned in your email:
+
+albedo over snow-covered surface: we will need to confirm, but this would be a category B variable defined only over the portion of the cell with snow.
+
+LAI: Since it is an index it might be defined even over the ocean, but we need to check.
+
+
+
 == Calendar ==