Branch ORCHIDEE-IPSLCM5A2.1

The coupled model IPSLCM5A2 is an update of the model IPSLCM5A used for CMIP5. One of the goal of this model is to have a model which runs fast. It therefore uses newer model versions to include hybrid parallelism and use of XIOS. It still uses the same model set up as for IPSLCM5A (at least for ORCHIDEE).

The branch ORCHIDEE-IPSLCM5A2.1 has been created to allow some technical changes related to the coupling to INCA whitout changing the model ORCHIDEE itself.

1. Cozic is in charge of this branch.

Version IPSLCM5A2.0

This version of the coupled model includes trunk/ORCHIDEE rev 3925.

Version IPSLCM5A2.1

This version of the coupled model uses branches/ORCHIDEE-IPSLCM5A2.1. This branch is based on a copy of the ORCHIDEE trunk revision 3930 and containing also an update of the interface towards INCA rev [4456].

Comparison of ORCHIDEE used in IPSLCM5A and IPSLCM5A2

Here below are listed developments and corrections done on the trunk between the tag ORCHIDEE_1_9_5 and revision 3930 that might impact the model IPSLCM5A2 according to the orchidee.def used.

Following technical developments have been added in the trunk:

• Interface to XIOS for output diagnostics
• Hybrid (MPI-OpenMP) parallelisation
• Correction to restart correctly 1+1=2
• Corrections of minor bugs

Following changes on the trunk might have an impact on the results, according to orchidee.def used in IPSLCM5A2:

• [3930] : Correction on vbeta in diffuco_comb for water conservation
• [2425] : Added beta factor, important for coupled simulations, see ticket #157
• [2360], [2361] : See ticket #136 : Limitation of snow mass. Might change results
• [2183] :
• [2093] : Bug correction in enerbil, see ticket #137
• [2031] : Merge the Photosynthesis branch primarily based on the work of Yin et al (2009). Some change in results.
• [1987] : Changed default value for DOWNREGULATAION_CO2 from TRUE to FALSE
• [1957] : Change formula for snow albedo, ticket #74 . Change in results are excpected. But also introduced a bug. This revision do not compile!! Use rev [1959].
• [1882] : Modification of parameters for tropical forests and activation of CO2 downregulation, more details here trunk/DownRegulation
• [1383] : Changed default values for vc_max_opt and vj_max_opt parameters. Results change.
• [1102] : Merged new phenology branch into the trunk. Use with caution. Some changes are expected in stomate outputs (tropics especially). Please, look at Branches/ORCHIDEE-NEWPHENO for more details.
• [864] : Specific leaf area (SLA) is prescribed => Change in results.
• [10] : This revision on the trunk corresponds to the tag orchidee_1_9_5 used in IPSLCM5A

orchidee.def used in both versions of IPSLCM5A2

#
#**************************************************************************
#                    Parameter file list for ORCHIDEE
#**************************************************************************

# Input and output
#**************************************************************************
# Restart the time from the GCM. 
# default = n
SECHIBA_reset_time = y

# Name of restart to read for initial conditions
# default = NONE
SECHIBA_restart_in = _AUTOBLOCKER_

# Name of restart to read for initial conditions of STOMATE
# default = NONE
STOMATE_RESTART_FILEIN = _AUTOBLOCKER_

# Use XIOS for writing diagnostics file
# defulat = n
XIOS_ORCHIDEE_OK = y

# Writefrequency in seconds in sechiba_history.nc
# default = 86400.0
WRITE_STEP = 0

# Hydrology parameters
#**************************************************************************
# Activate the multi-layer diffusion scheme adapted from CWRR
# by default the Choisnel hydrology is used.
# default = n
HYDROL_CWRR = n 

# Total depth of soil reservoir
# default = 2./4. depending on HYDROL_CWRR
HYDROL_SOIL_DEPTH = 4.

# Root profile
HYDROL_HUMCSTE = 5., .4, .4, 1., .8, .8, 1., 1., .8, 4., 1., 4., 1.

# Activate river routing
# default = n
RIVER_ROUTING = y

#**************************************************************************
# Activate Stomate component
# default = n
STOMATE_OK_STOMATE = _AUTOBLOCKER_ 

# Activate calculations of CO2 according to Farqhuar and Ball
# default = n
STOMATE_OK_CO2 = y

# Use cdrag coefficient from gcm
CDRAG_FROM_GCM = y

# Interception reservoir coefficient.
# default = 0.1
SECHIBA_QSINT = 0.02

# Parmeters related to vegetation map
#**************************************************************************
# Year of the land_use vegetation map readed
# year off the pft map
# default = 282
VEGET_YEAR = 1

# The parameter is used to bypass veget_year count 
# and reinitialize it with VEGET_YEAR parameter.
# Then it is possible to change LAND USE file.
# If LAND_USE
# default = y
VEGET_REINIT = n

# Update vegetation frequency (since 2.0 version)
# The veget datas will be update at this period if LAND_USE
# default = 1Y
VEGET_UPDATE = _AUTO_

# Do not use default fire module
FIRE_DISABLE = y

# Create river description file
RIVER_DESC = _AUTO_
RIVER_DESC_FILE =  river_desc.nc

# Parameter related to chemistry bvoc 
#************************************************************************
# CHEMISTRY_OK_BVOC ([FLAG]) :  Activate chemistry    {OK_SECHIBA}
# default =  n 
CHEMISTRY_BVOC =  n

# CO2 FOR BVOC - WILKINSON ([FLAG]) :  CO2 inhibition effect for isoprene based on Wilkinson approach?    {CHEMISTRY_OK_BVOC }
CO2_FOR_BVOC_WILKINSON=n

# CO2 FOR BVOC - POSSELL ([FLAG]) :  CO2 inhibition effect for isoprene based on Possell approach?    {CHEMISTRY_OK_BVOC }
CO2_FOR_BVOC_POSSELL=n