wiki:Documentation/Forcings

Version 36 (modified by jpolcher, 7 years ago) (diff)

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DocumentationMain VersionTag VersionsOther VersionsScriptsForcingsSimulationsEvaluationToolsHow toMeetingsSeminarsUserListContact

Drivers of ORCHIDEE model

ORCHIDEE needs several forcing data in order to run correctly. The number of requested data is dependant of the configuration used.

In On-Line mode, the data needed are related to soil texture and color. If the vegetation is prescribed, ORCHIDEE needs in addition a vegetation information defining the fraction of each PFT per gridcell. Vegetation types gathered in these vegetation maps can be either PFT or Holson categories.

In Off-Line mode, ORCHIDEE is forced by weather data based on observations or climate model reanalysis. Last, depending of the options activated within a run of ORCHIDEE, additional maps might be used for irrigation, slope for routing scheme, ...

This document Description_Forcing_Files.pdf provides detail of how forcing files need to be prepared. It addresses in particular the issues one may face when the fluxes are averaged and scalar variables instantaneous. The driver needs to take this into account else the diurnal cycle needs to be misplaced. Some data providers have different convention for representing averaged fluxes and this type of details matter.

1. Weather data

These forcing fiels are stored into IGCM/BC/OOL/OL2 directory on CCRT, IDRIS at least.

1.1 CRU

Name Spatial information Temporal information Web documentation Size
Abbreviation Full name Coverage Resolution First year Last year Number of years Resolution Informations Data download References GB
forceYYYY.nc -180:180; -90:90 720x360 1901 2002 103 monthly oct 2004 10.7 GB
forceYYYY_YYYY.nc -180:180; -90:90 720x360 1901_1909 1994_2002 7 monthly oct 2004

1.2 CRU-NCEP

Name Spatial information Temporal information Web documentation Size
Abbreviation Full name Coverage Resolution First year Last year Number of years Resolution Informations Data download References GB
cruncep_halfdeg_????.nc -180:180; -90:90 720x360 1901 2010 110 6H 27 sept 2011 362 GB
cruncep_halfdeg_????_noleap.nc -180:180; -90:90 720x360 1904 2008 27 6H 27 sept 2011 89 GB

1.3 FLUXNET

Name Spatial information Temporal information Web documentation Size
Abbreviation Full name Coverage Resolution First year Last year Number of years Resolution Informations Data download References GB

BC : AB.def BR.def BVC.nc BX2.def BX.def Cabauw.def CP.def FL.def GU.nc HV.nc LW.nc MA.nc ME.nc NB.nc NO.nc PO.nc PU.nc SH.nc SO.nc UP.nc VI.nc WB.nc WE.nc AB.nc BR.nc BVS.nc BX2.nc BX.nc Cabauw.nc CP.nc FL.nc GU.def HV.def LW.def MA.def ME.def NB.def NO.def PO.def PU.def SH.def SO.def UP.def VI.def WB.def WE.def

BC/FORCAGE2 : BVC.def BVC.nc BV.def BV.nc BX.def FI.def HE.def HY.def LO.def SKo.def TH.def

1.4 ISLSCP

Name Spatial information Temporal information Web documentation Size
Abbreviation Full name Coverage Resolution First year Last year Number of years Resolution Informations Data download References GB
islscp_for_1987.nc -180:180; -90:90 360x179 1987 1987 1 6H 28 jun 2005 1.1 GB

1.5 ISLSCP2

Name Spatial information Temporal information Web documentation Size
Abbreviation Full name Coverage Resolution First year Last year Number of years Resolution Informations Data download References GB
islscp_for_????.nc -180:180; -90:90 360x179 1982 1995 14 3H (6H for 1982) 28 jun 2005 19 GB

1.6 NCC

Name Spatial information Temporal information Web documentation Size
Abbreviation Full name Coverage Resolution First year Last year Number of years Resolution Informations Data download References GB
ncc_for_????.nc -180:180; -90:90 360x180 1948 2000 52 6H info sept 2005 ref 37 GB

1.7 NLDAS

Name Spatial information Temporal information Web documentation Size
Abbreviation Full name Coverage Resolution First year Last year Number of years Resolution Informations Data download References GB
orchidee_NLDAS_forcing_??????.nc -67:-24; 25:52 464x224 199701 200212 6 1H mai 2008 197 GB

1.8 WFD3/annual

Name Spatial information Temporal information Web documentation Size
Abbreviation Full name Coverage Resolution First year Last year Number of years Resolution Informations Data download References GB
WFD_????.nc -180:180; -90:90 720x360 1958 2001 44 3H april 2010 300 GB

1.9 WG

Name Spatial information Temporal information Web documentation Size
Abbreviation Full name Coverage Resolution First year Last year Number of years Resolution Informations Data download References GB
WG_??.nc -180:180; -90:90 320x160 79 93 15 1M may 2007 20 MB
WG_CRU.nc (noleap) -180:180; -90:90 720x360 1 1M may 2007 37 GB

1.10 Scripts examples

  • FORTRAN 90 script to create a land points only forcing file (use of the compress attribute) mk_grid.f90

2. Vegetation information

ORCHIDEE model can read vegetation map based on Olson categories or on PFT categories. When a PFT map is used as an input, the parameter land_use in the .def file should be set to TRUE, else to FALSE.

2.1 Olson map

A map at 5km resolution with the dominant Olson class has been generated by Nicolas Viovy based on a 1km IGBP map. The map is available on the common repository of ORCHIDEE forcing files on CCRT, IDRIS and other platforms. It is also available here. This map contains 94 land categories. The conversion from Olson to PFT categories is done within the code of ORCHIDEE. Up to the version 1.9.5.2, there was a bug when converting Olson category 79 (warm C4 woody savanna). It was distributed into tropical broad-leaved raingreen (40%) and C3 grass (40%) while it should have been tropical broad-leaved raingreen (40%) and C4 grass (40%). This bug has been fixed in the version 1.9.6.

2.2 PFT maps

2.2.1 Based on Olson

Static maps

A Python script have been developed by Martial Mancip in order to convert 'offline' Olson-based map to PFT-based map. For this purpose, an Olson map has been generated at a 0.5 deg resolution, in which fractions of Olson categories are defined for each cell (and not only the dominant category). The 0.5° Olson map is available here. The PFT map generated by this script is available ????.

Dynamic maps

The PFT map based on Olson categories has been combined with some historical trends and future projections datasets of Land-Use changes. This work has been carried out by Nathalie de Noblet within the frame of the AR5 IPCC exercise. The historical dataset is the HYDE 3.0 dataset (Klein Goldewijk) and the future projections are delivered by the four Integrated assessments models for the four Representative Concentration Pathways (RCP): MESSAGE (RCP 8.5), AIM (RCP 6), MiniCAM (RCP 4.5), IMAGE (RCP 3.0). A report and a presentation on the methodology developped have been written by Nathalie. Both documents are availabe [

2.2.2 Maps based on recent Satellite Land Cover products

In a recent paper (see reference below) B. Poulter has proposed a method to convert satellite land cover products (GLC2000, Globcover, MODIS) into PFT maps, using Köppen-Geiger bioclimatic zones.

  1. Macbean and B. Poulter have updated the cross-walking approach based on discussions with the Globcover team in July 2012 at UCL.

The new land cover CCI should be available at end of 2012 for use with ORCHIDEE.

  1. Poulter has developed tools to do conversions at any spatial resolution. N. Macbean has equivalent tools in python. Please contact them directly to know more about this. The objective is to have these tools available later for everybody under the TOOLS directory.

Poulter, B., Ciais, P., Hodson, E., Lischke, H., Maignan, F., Plummer, S. & Zimmerman, N. E. (2011). Plant functional type mapping for earth system models. Geoscientific Model Development, 4, 993–1010, doi:10.5194/gmd-4-993-2011

2.2.3 Global Land Use modeling data formatted for ORCHIDEE

2.2.4 Future projections based on RCP's

3. Soil texture and color data

4. Irrigation

5. Slope

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