GRIDDED DATA SETS
README_GRIDDED_DATA.asc for the
GRIDDED DATA SETS
from the NOWESP Research Data Base
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The GRIDDED DATA SETS from NOWESP consist of climatological monthly fields
for nine state variables: the climatological monthly maps for the surface layer (0 - 30 m)
are stored in the directory SURFACE;
all merged data sets provided by the NOWESP Research Data Base
were used to calculate these gridded data sets (see Radach et al., 1996).
The nine main parameters are
temperature, salinity,
phosphate, nitrate, nitrite, ammonia, silicate,
suspended particulate matter,
chlorophyll
For each of the nine state variables there exist three ascii files,
respectively, called
- statevariable_values.asc (earlier: grid_data.asc): this file contains the gridded data sets;
- statevariable_pos.asc (earlier: cross_in_plot): this file contains the geographic positions of the data that have been used in the gridding procedure;
- statevariable_numbers.asc (earlier: haeufigkeiten.asc): this file contains the number of data per grid point that have been used in the gridding procedure; where 'statevariable' has to be replaced by the name of the state variable.
Each file corresponds to all climatological monthly means, beginning with the field for January and ending with the field for December. Format Description
The data can be read by the following routine;
the variable names used are explained in the comments of the routine;
for reading of a special data set the names of the files have to be specified accordingly
in the open statements. The additional file nw_land_wasser. asc is provided
under this directory.
C monat: month
C cname: name and unit of the parameter
C depth interval from ot to ut. ot: upper depth, ut: lower depth
C min_wert, max_wert: minimum and maximum value of the gridded data.
C ndata: number of positions, nzeilen: number of data.
C kmax: maximum of index k in direction south
C lmax: maximum of index l in direction east
C k=1, l=1: first grid point at 63 deg. 53' N, 15 deg. 5' W
C grid resolution north-south: 12'
C grid resolution west-east : 20'
C missing value= -9999.: for land or no value available
C additional file nw_land_wasser.asc: 0: land, 1: water
parameter(kmax=102, lmax=88)
character cname*25
real min_wert, max_wert, ot, ut
open(12,file='grid_data.asc')
open(16,file='cross_in_plot')
open(18,file='haeufigkeiten.asc')
do 100 monat=1,12
...
...
C writing the gridded data in ascii
write(12,'(a,2f10.4)')cname, min_wert, max_wert
write(12,'(3i5)')nint(ot),nint(ut),monat
write(12,502)((grid(k,l),k=1,kmax),l=1,lmax)
C writing the number of data per grid point in ascii
write(18,'(a)')cname
write(18,'(3i5)')nint(ot),nint(ut),monat
write(18,502)((values(k,l),k=1,kmax),l=1,lmax)
502 format(8f10.4)
C writing the positions of the data.
write(16,'(2i6)')ndata, nzeilen
write(16,'(6f11.7)')(phi(k)*180./pi,rlam(k)*180./pi,
& data(k), k=1,nzeilen)
100 continue
close(12)
close(16)
close(18)
Format of the additional file nw_land_wasser.asc:
open(17,file='nw_land_wasser.asc')
do 730 k=1,kmax
read(17,'(200i1)')(land(k,l),l=1,lmax)
730 continue
close(17)
If the extension of one of the files is '.zip', unzip the file with the command 'unzip name.zip'.
When making use of the data, please, make reference to the relevant NOWESP publications.
The data sets have been presented in the following publications:
Radach, G., & J. Gekeler, 1997b.
Gridding of the NOWESP data sets: Annual cycles of distribution of concentrations
of temperature, salinity, nutrients, suspended matter, and chlorophyll on the
north-west European shelf. Berichte aus dem Zentrum für Meeres- und
Klimaforschung, B 27: 1-375.
Radach, G., J. Gekeler, J. 1996:
Annual cycles of horizontal distributions of temperature and salinity,
and of concentrations of nutrients, suspended matter, and chlorophyll
on the north-west European shelf.
Dtsch. Hydrogr. Zeitschrift 48 (3) (submitted)
Radach, G., J. Gekeler & O. Kleinow, 1997.
NOWESP Data Sets. Technical Report. Third edition. RWS, Den Haag.
Two volumes: Vol 1: 1-372, Vol.2: 373-665.
L. Foyn, J. Gamble, R. Laane, J.P. Mommaerts, D. Nehring, K. Pegler, W. van Raaphorst, J. Wilson, 1996.
The NOWESP Research Data Base. Dtsch. Hydrogr. Zeitschr. 48 (3) (submitted).