Summer surface salinity field constructed on a 167x63 grid.
Table of Contents
This page provides access to the Mediterranean seasonal climatology reconstructed from an historical hydrological data base. The resulting 3D fields (salinity, temperature and velocity) are stored as 3D matrices, with description of the grid location. Direct access to these fields and a description of the file format are also provided on this page.
If you prefer to load the files manually, please use the
ftp server instead.
If there is any problem with this data set (reading, importing, ...) please contact the MODB support (firstname.lastname@example.org).
2. Three successive releases
Three versions of this seasonal gridded data set have been released (MED2, MED4 and MED5). They differ in the data base and the methods that have been used to build them. These data sets are available on the last part of this page by clicking on the convenient (MED2, MED4 or MED5) button.
-A- THE MED2 DATA SET (RELEASED APRIL 01, 1994)
The MED2 Gridded Data Set is the result of the application of the VIM analysis method (1) to an historical data bank resulting from the merging of two main files:
A full description of this data set, the analysis technique and the results obtained at the seasonal time scale is available in (2). The printed version of an atlas (3) can be ordered by sending an e-mail to email@example.com.
-B- THE MED4 DATA SET (RELEASED APRIL 24, 1995)
The MED4 Gridded Data Set was computed using the first released MODB data base which differs from the previous one mainly in the addition of the bathythermographs from the U.S. NODC world ocean data bank.
This version of the climatology does not include the full MODB data base yet. Nevertheless, it has been used as a reference climatology in several scientific works (see examples below).
-C- THE MED5 DATA SET (RELEASED SEPTEMBER 24, 1996)
This may be considered as the final version of the Mediterranean climatology released by the MODB project. The final report include an atlas representing this climatology. We are preparing both paper and online versions of this document.
3. Analysed Data Fields
There are four seasons for the data set :
There are four files for each season :
Units are 'psu' for salinity, 'degree Celsius' for temperature and 'm/s' for velocity.
4. Matrix description
To understand the way the data is stored, please refer to the figure below. The files are stored in a 3D array (matrix) with 3 indexes I, J, K, going from 1 to IMAX, 1 to JMAX, 1 to KMAX. The origin is located at the 'bottom left deepest corner'.
There are KMAX horizontal slices from the bottom (K=1) to the surface (K=KMAX). Increasing I's go from W to E and increasing J's go from S to N.
Islands, coasts and places where there are no values are represented by an exclusion value.
6. Reading the data
The data sets are stored in compressed ASCII files. First you must 'uncompress' the files with the Unix command 'uncompress'. The size of your file will increase to about 4.3 MB.
The first line of the ASCII file contains the dimension of the array : IMAX, JMAX, KMAX. The integers are stored with the FORTRAN format I5.
The second line contains the exclusion value, the minimum and the maximum value of this file. These numbers are stored with the FORTRAN format E12.5.
The remaining lines contains the data of the array, with 5 numbers per line (except the last line for each I-line).
The array is stored in horizontal slices from sea surface to sea bottom and from north to south. So the indexes go from :
DO K = KMAX to 1 DO J = JMAX to 1 DO I = 1 to IMAX read OD OD OD
7. Access to the Data Fields
Here is the list of the available matrices :