Geoscience Reference
In-Depth Information
Table 7.10 Database structure
Column name
Content
Data format
Id
Number of cells of coordinate grid
Number,
1
-
32,400
Land
Indicated that cell belonging to the land area or ocean
Land/ocean
Earthquake
The number of registered earthquakes for the period 1973
0
5310
-
-
2011
Earthquake_pt
Points
0/1/2
Volcanoes
The number of volcanoes
0
12
-
Volcanoes_pt
Points
0/1/2
Geo
Indicates the proximity of grid cell to the faults oceanic
crust
0/1/2
Geo_cont
Indicates the proximity of grid cell to the faults continental
crust
0/1/2
Streams
Indicates the absence/presence of convergence zones in
oceanic currents
0/1
Summa
Total points for columns: Earthquake_sc+Volcanoes_sc
+Geo+Geo_cont+Streams
0
6
-
In addition to these indicators of tectonic activity, data on the possible influence of
ocean currents have been included in the database too. The presence of ocean currents
is largely caused to constant winds. Effect of Inter-Tropical Convergence Zone
(ITCZ
a transition zone between trade winds of the northern and southern hemi-
spheres, or between trades and monsoons, or between trades and equatorial westerly
winds) on the formation of tropical cyclones is well known. It is characterized by the
convergence of velocity, i.e. the weakening of the wind speed and the convergence of
the streamlines, as well as intensive development of convective clouds. The database
included data on the presence of convergence zones of oceanic currents: 0
—
—
no zones
of convergence of oceanic currents, 1
there is such zone.
All data were entered into the database (1
—
grid). Further obtained points for
all indicators were summed up. Database is shown in the Table
7.10
.
°×
1
°
7.8 Concluding Remarks and Future Problems
An analysis of observational data characterizing the ocean-atmosphere system
dynamics in the tropical sector of the World
s oceans shows that differentiation of
the ocean-atmosphere system phases by means of transitions in the meteorological
percolation cluster allows the division of zones with different levels of the ocean-
atmosphere system instability. To achieve a more reliable agreement between the
ocean-atmosphere
'
system state
and parametrical
space of meteorological
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