of the internal friction will not essentially change the results. 



The opinions of different authors are most controversial in 

 discussion of the wind stress at the sea surface, especially at 

 wind velocities less than 10 m/sec. It is this critical range of 

 wind speeds which comes into consideration when dealing with clima- 

 tological wind data, over most parts of the sea surface. At present, 

 more and more evidence has been accumulated which shows that the 

 effective wind stress at low wind speeds is larger than it was 

 hitherto assumed by most of the workers on this subject. There- 

 fore, the stress formula as suggested by the author in 194-8 was 

 used to calculate the wind stress for given wind velocities. 



Some special cases of the wind driven circulation beneath the 

 layer of frictional influence are analyzed, such as the meridional 

 flow along the east coast of the United States, and the zonal flow 

 of the Antarctic Circum Polar Current. The outline of future 

 work briefly discusses the ideas which may lead to a better approach 

 of wind driven circulation in a real ocean, taking the true average 

 wind field and the boundaries into account. This approach is based 

 on a numerical integration of the differential equation for the 

 horizontal mass transport in an ocean where the wind induced cur- 

 rent systems have a variable depth. 



iv 



