Changes between Version 1 and Version 2 of Branches/Driver_Improvements

Timestamp:

2012-09-13T09:24:55+02:00 (12 years ago)

Author:

nvuilsce

Comment:

--

Branches/Driver_Improvements

@@ -6 +6 @@
 == Reminder ==
 The driver of ORCHIDEE is expected to read forcing files with a very specific temporal structure.
-The fields read at a certain time step t in the NetCdf file correspond to:
+All time information are defined on UTC time.
+ The fields read at a certain time step t in the NetCdf file correspond to:
 the instantaneous value at t+1 for Temperature, Wind Speed, Air Pressure and Specific Humidity. 
 the mean value between t and t+1 for Long and Short Wave Incomming Radiation and the Precipitation. 
 
-Instantaneous fields and the LongWave Radiation are then linearly interpolated for each t:t+1 time period in order to calculate half-hourly value.
-The Precipitation field is downscaled to half-hourly resolution using a step distribution function with one parameter (spread_prec). 
+ * Interpolation
+  * Instantaneous fields and the Long-Wave Radiation are then linearly interpolated for each t:t+1 time period in order to calculate half-hourly value.
+  * The Precipitation field is downscaled to half-hourly resolution using a step distribution function with one parameter (nb_spread, that is the number of half-hourly time steps over which we spread the precipitation). nb_spread can vary from 1 (all precipitations over a forcing time period (3 ou 6 hours) are put on the first time step) to SPLIT_DT (number of integration time steps with a forcing time period, in that case, the precipitation are distributed uniformely). By default, nb_spread is set to 1. 
+  * The Short-Wave radiation is interpolated using a function distribution that corresponds to the solar angle distribution over a forcing time period.
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+== Add an explicit time information within the forcing files ==
+As described above, the driver of ORCHIDEE is relatively rigid because it only assumes one temporal specification for the forcing files. At first, we do not expect to develop a more flexible driver but we would like to add explicit time information in the driver in order to avoid misuse.
+We suggest to add time_bounds attributes to the variables stored in the NetCdf forcing files.
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