UNIVERSITY OF CALITORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 15, No. 3, pp. 255-356, plates 1-38 December 6, 1916 



SUMMARY AND INTERPRETATION OF THE 

 HYBROGRAPHIC OBSERVATIONS 



MADE BY 



THE SCRIPPS INSTITUTION FOR BIOLOGICAL 

 RESEARCH 



OP THE 



UNIVERSITY OF CALIFORNIA 



1908 TO 1915 



GEORGE F. McEWEN 

 Hydrographer 



CONTENTS PAGE 



Introductiou 2.56 



A. Tlie region surveyed 257 



1. Number of observations in different portions of the region 2.57 



2. Topography of the ocean bottom 257 



B. Horizontal distribution of temperatures and salinities 258 



1. Surface isotherms and isohalines in several large areas 258 



((() Some general i)rinciples underlying oceanic circulation 258 



(6) Methods employed for determining isotherms and isohalines.... 259 



(c) Isotherms 259 



(d) Isohalines 261 



2. Surface and subsurface isotherms and isohalines west of the Coronado 



Islands 263 



( a) Isotherms 263 



(6) Isohalines 264 



C. Relation of temperature and salinity to distance from the coast 265 



1. Isotherms 265 



2. Isohalines 266 



D. Periodic variations in temperature and salinity 267 



1. Seasonal variations 267 



2. Mean annual values 270 



3. Diurnal variation 271 



E. The thermoeline and accompanying salinity distribution 272 



F. Certain theoretical implications of the observations 274 



G. Literature cited 280 



