2. Data on atmospheric pressure.
This description below is based on the original one from AARI (See Expl.doc).
The source tables referred to are included in the
\INSROP_GIS\Sourcedata\AARI-FNI 1996\AirPressure folder, while the zip files are included in the
\INSROP_GIS\Sourcedata\AARI-FNI 1996 folder.
A brief description of the initial data
As initial data, the data sets of surface atmospheric pressure observations at
synoptic times (00, 12 hours GMT) from the US National Center for Atmospheric
Research for the period 1964 to 1989 and from the Hydrometeorological Center of
Russia for the period 1989-1994 in the grid points with a spatial resolution
2°.5N x 5°E were employed. In total, there are 385 points in the prescribed area
(E40-E210/N60-85).
For estimating whether the data sets under consideration are adequate, a
comparison of statistical characteristics calculated on their basis for one and the
same year 1989 was performed. Also, mean monthly, maximum and minimum values of
atmospheric pressure for the period 1966 to 1994 for three grid points were
compared to the corresponding data of the meteorological stations located near
these points. The analysis of the comparison results has shown the data sets of
the US NCAR and the Hydrometcenter of Russia to be in good agreement: the
correlation coefficient between the maximum, minimum, mean and standard deviations
was 0.99. The correlation coefficient at the stations and at the grid points was
0.96 for mean monthly values, 0.95 for the maximums and 0.94 for the minimums.
A brief description of the processing method
The statistical characteristics were calculated by means of a conventional
method. Based on surface pressure values for each of the grid points, the pressure
minimums and maximums, mean monthly values and their standard deviations were
determined for each month.
A brief description of the data transferred
The co-ordinates of the grid points are presented in the form of the ASCII
file (tbl_03.txt) containing Table 3. The record of Table 3 includes the following
fields: No. of the square; latitude of the grid point (degrees); longitude of
the grid point (degrees). The results of statistical calculations are presented
in the form of 31 ASCII files (tbl_04.txt, tbl_05.txt, ...tbl_34.txt)
containing Table 4 . The record of Table 4 includes the following fields: No. of the
point; year; month; maximum; mean; minimum; standard deviation. The files
containing Table 4, are compressed using pkzip software and are presented in the form
of four files: p_st6473.zip (data for 1964-1973), p_st7483.zip (data for
1974-1983), p_st8493.zip (data for 1984-1993) and p_st94.zip (data for 1994).
Path: <NSR_DATA>\meteorol\pa_aari
GeoDataset type: Shapefile with Point features.
Coordinate system: Latitude/longitude in decimal degrees
* Air pressure
385 Points, 1 descriptive field.
Fields: [<Name>] -- <Alias> (type of field)
[Point__] -- "Point__" (Numeric, no decimals)
Air pressure locations