Air-sea temperature difference (T^-Tg) °C 



(Resio & Vincent, 1977b) 



Figure 3-14. 



Amplification ratio, Rj. , accounting for effects of air-sea 

 temperature difference. 



0.5 



Use R,= 0.9 



for Ul > 18.5 m/s (41.5 mph) 



Windspeeds ore referenced 

 to 10-meter level 



10 



IS 



20 



25 



m/s 



5 10 15 20 25 30 35 40 45 50 55 60 mph 



10 15 



20 25 

 U, 



30 35 



40 



45 kn 



(after Resio & Vincent, 1977b) 



Figure 3-15. Ratio, R^ ,of windspeed over water, Ut^ , to windspeed over 

 land, Uy , as a function of windspeed over land, U, 



3-31 



