BACKGROUND 
This flow is called the geostrophic current. It provides for the flow to follow the 
direction of the isobars ( lines of constant pressure). 
The ocean are located in an oblique field of gravitational forces.The solid earth's masses 
are distributed unevenly and perturbing potential of it gravity are external with respect 
to the world ocean . 
As a results the water medium are forced by the gravity field components,which are 
directed along a normal z,g , and a tangent s to the mean sea level ( reference ellipsoid) 
1.» directed toward a reduction in N,undulation of the geoid with respect of the 
reference ellipsoid: 
According so the acceleration of a fluid parcel 
is written as ? mb Oi 
rw | ; bs ; 2 
a ecd uere 
Sort arabs cot NÄCHTE 
QV 2-$ E -4MW-4. S£-9, C3) 
Qu Ll a 
ct 93 et 
North,east and vertical velocity components (u,v,w) are given in a Cartesian coordinate 
system with z vertical so that acceleration due to normal gravity,g,is in the negative z 
direction; 
8,7 g IN/x = Xg; 8,7 g0N0y = -b 8; 
t ^ deflections of vertical. 
At | arc sec magnitude of vertical deflection the magnitude of tangential gravity force 
is 57 5.10\-3 cm/sec/sec, or 5.10\-6 normal gravity g . 
We have collected different types of the water moving forces (Hasse,Dobson,1986) 
which are displayed in the Table 1,including accelerations due to gravity. This data 
indicate that the gravity information will be some time very useful for the good 
understanding of the moving forces in the ocean . 
THE VERIFICATION 
LARGE-SCALE 
We first examine the performance of gravity information's in a planetary scale by 
applying them to formation the trajectory of a Florida current,assuming that the 
results of the action of gs is analogous to the geostrophic flows : the direction of the 
geostrophic flows is normal to the common pressure gradient. 
The Coriolis acceleration vanishes at the equator, hence below equator the current 
caused by g , must be coincide the isolines of geoidal undulations N. 
Based on the Goddard Space Flight Center detailed gravimetric geoid from North 
America to Europe (Vincent,1972) ,the effect of gs were estimated and have been 
compared with the effect of Coriolis's acceleration at the region of the Gulf Streams 
Florida current trajectory with coordinates : north latitude from 30 to 37 degree,west 
longitude from 80 to 72 degrec. 
512 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B3. Vienna 1996 
  
  
  
  
   
  
   
   
  
   
  
   
  
  
  
  
  
  
  
   
   
  
  
  
   
    
     
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