TABLE OF CONTENTS 



Page 



Introduction .. 1 



Basic data 2 



Sources and definitions 2 



System of indices 3 



Tabulation of indices 7 



Regional wind indices 7 



Representativeness of indices 9 



Decade means 10 



Time series 13 



Correlation of wind indices with oceanographic data 14 



Literature cited 17 



Tables 18 



No. 

 1. 



2. 



3. 

 4. 



FIGURES 



Location charts showing points, marked by open circles, 

 between which pressure differences tabulated in table 1 

 were read 



(a) Ocean circulation in winter. 



(b) Normal sea level pressure distribution for January 



(a) Ocean circulation in summer. 



(b) Normal sea level pressure distribution for July . . . 



Location of points, marked by open circles, used for 

 reading supplementary pressure differences given in 

 tables 3 and 4 



Grand monthly means of pressure differences for period 

 1926-57. (a) Kuroshio index, (b) Westerly index, (c) 

 Trade index, (d) California index, (e) Alternate Cali- 

 fornia index, (f ) Oyashio index, (g) Alaska index, (h) 

 Inland Alaska index 



Pressure differences representing "cross-current" wind 

 components at locations 3a-6a averaged by month for 

 period 1946-57 



Pressure differences representing "maximum westerly" wind 

 components (defined in text), plotted against values of 

 westerly index for (a) winter months and (b) summer 

 months 



4 

 5 



8-9 



10 



111 



