The maps describing the surface for ORCHIDEE
Written by Administrator
Monday, 09 August 2004 08:30
Surface description maps for ORCHIDEE
In its most basic version (That is SECHIBA without STOMATE) the surface scheme only needs the vegetation map, the soil colors and very soon the soil types. We have made a number of choices for these maps. They are explained below and the the data sets can be accesses from this pages. The data is in the netCDF format and can be read ass is by the model.
The vegetation maps
The vegetation map which was chosen is 1km by 1km IGBP map with the Olson classification. I order to reduce noise and error it was chosen to reduce it to 5km by 5km by taking the dominant vegetation type. This also reduces the amount of data while ensuring that the resolution is sufficient for most if not all atmospheric applications of ORCHIDEE. A few new vegetation types were introduced ... Nicola Viovy has more information !
The LAI map
To compute the LAI, we can use this map which is an 1km by 1km one. You can ask Nicolas Viovy for more informations. The file with this data is available here.
The soil types and colors
The soil color classes for computing the bare soil albedo were taken from the 1deg x 1 deg data set of Wilson and Henderson Sellers. The soil types are by Zobler and were taken from the ISLSCP CD-rom. The resolution is not perfect but to our knowledge it is all which is available today. Both data sets are in the same file which is usual in netCDF and directly accessible by the model. The soil types are not yet in use as the new soil hydrology developed by Patricia De Rosnay is not yet implemented.
The map of the world's basins
This map of the world's basins was built by combining the map built at the University of New Hampshire by he team of Charles Vorosmarty and the one built by Taikan Oky for the TRIP scheme. The resolution is 0.5deg x 0.5deg and includes Greenland and Antartica. The file also includes other parameters needed by the routing scheme (More explantions will come later).
Long term temperature climatology
To start the model we need a long term averaged surface temperature in order to initialize the phenology of the model. Once the model is running it will build its own climatology. The file with this data is available here.
Last modified: Mon Jul 2 15:07:08 CEST 2001