NO A A PROFESSIONAL PAPER 11 



6.0 

 5.6 

 5.2 

 4.8 

 4.4 

 4.0 

 3.6 



i- 



o 



l/> 28 



< 



2.4 



2.0 



1.6 



1.2 



0.8 



0.4 



0.0 



OBSERVED VALUES 

 A 1975 

 • 1976 



STATION 69 



"T ; 1 1 



STATION 23 



Mar Apr May Jun Jul Aug Sep Od Nov Dec 



MONTH 

 STATION 88 



OBSERVED VALUES 

 ▲ 1975 

 • 1976 



o 



2.4 

 2.0 



1.2 

 0.8 



Jan Feb Mar Apr Mar Jun Jul Aug Sep Ocl Nov 



OBSERVED VALUES 

 ■ 1974 

 ▲ 1975 

 • 1976 



Jan Feb Mar Apr May Jun Jul Aug Sep Ocl Nov Dec 



MONTH 



FIGURE 5-2. — Sigma-/ differences between surface and 30 m vs. 

 time for stations 69, 88, and 23. 



MONTH 



128 



