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Computations of atmospheric energy and several of its tramformation terms from data extending back to October 1958 have been carried out using the National Meteorological Center's ADP analyses. From these calculations the annual variation of thc atmosphere's energy cycle has been estimated. In addition, some yearly differences for the colder half of the year arc described.

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Wind blowing across a water surface will transmit momentum to the water and cause a surface current. The ratio of water velocity to wind velocity is called the wind factor. This paper presents observed values of the wind factor obtained-as median values and by rcgression analysis of wind velocity OS. water velocity.The data show that the wind factor is a discontinuous function at a critical wind speed. Water velocity in the surface layers increases with wind velocity until a critical wind speed is reached, and then it dccrcases. This observation is in agreement with Mu&s ( 1946 ) theory of a critical wind speed for air-sea boundary processes, which yields air-sea boundary instability for winds cxcecding 6.5 m/see. The observations taken in Lake Mendota yield a critical wind speed of 5.7-6.1 m/see. The present results were arrived at after a study of 356 observations. BACKGROUND ON TIIE WIND FACTOR