Ocean Temperatures along the West Coast of North America. 



265 



and the bottom temperature. It is the actual value usually found at 

 the depth of 500 meters. 



Using for (V w ) the average wind velocity for the month's time 

 just proceeding the middle of the month to which the mean tem- 

 peratures (t 2 ) and (T) correspond, the value of (t>) for the latitude, and 



a constant value of (x^-}- *^ determined by trial, the temperature 



difference (t) and the actual temperature (T) of the in- shore water were 

 calculated for each month of the year. And the results were compared 

 with the observed values. The values of (V w ) were calculated 1 ) from 

 the U. S. Coast Pilot Chart records, 2 ) and the temperatures were taken 

 from Thorado's maps, on which the surface isotherms for each month 

 of the year are plotted between the coast and longitude 140, and 

 between the latitudes 20 and 50. 



In the following tabulation of results San Diego is denoted by (1), 

 Point Conception by (2), San Francisco by (3) and Cape Mendocino by 

 (4). The same results are shown graphically by (Figs. 8, 9, 10 and 11). 



Station No. 1, Lat. 32 45', Long. 118, / sin = 0,736, t = 9, 

 (xi + YX 2 ) = 915 Kilometers, t = 0,017 V w (t a t 1 ) 



Average value of all of the observed values of t, 2,23 

 the three greatest t, 4,30. 



*) The frequency, or number of hours per hundred during which the average 

 wind velocity in each 5 degree square has the direction N, NNE, NE, etc. for each 

 month is denoted by the length of an arrow pointing in the direction of the wind. 

 The average force of the wind is expressed in Beaufort's scale. The velocity in 

 miles per hour is given by the formula V = (5 F) -j- 3, where F is the force in 

 Beaufort's scale. (See bulletin, Instructions to Marine Meteorological Observers of 

 the U. S. Weather Bureau, by James Page for a table showing the relation of (F) 



Revue d.ges. Hydrobiol. u.Hydrogr. Bd.V. H.2/3. Jg 



