METEOROLOGY 



47 



Land and Sea Breezes. Land during daytime is heated to a 

 higher temperature than the sea, consequently the hot air over the 

 land rises and the cooler air from the sea flows in to take its place 

 a sea breeze. During night-time the land cools more quickly than 

 the sea so that the above process again takes place but with the 

 direction of the breeze reversed, the hotter air rising from the sea 

 and the cooler air from the land flowing to take its place a land 

 breeze. 



Trade Winds. In the Atlantic Ocean we have the north-east 

 and south-east trades north and south of the equator respectively. 



The usual explanation given as to how they arise is due to 

 Halley, and consists in considering the effect of hot air rising in the 

 equatorial region and cold air from the north or south respectively 

 flowing in to take its place, while the directions of flow are modified 

 by the rotation of the earth as was first pointed out by Hadley. 

 From the general study of air currents made by the staff of the 

 Meteorological Office, it is concluded " that the great arterial 

 currents are really part of the general circulation of the atmosphere, 



