CONTENTS 



Page 



Introduction 1 



Observations 3 



Track 3 



Salinity 6 



Temperature-salinity-thermosteric anomaly 6 



Currents 7 



Oxygen 7 



Inorganic radicals 7 



Chlorophyll a. 7 



Productivity 7 



Water transparency 7 



Zooplankton and micronekton standing crops 8 



Miscellaneous 8 



Results and discussion 8 



Kinds of water available to form the fronts 8 



Fronts 3 and 5 15 



Surface temperature distribution 15 



Surface currents 16 



Vertical temperature structure 17 



Vertical salinity structure 18 



Thermosteric anomaly, 8^ 19 



T-S-8 relationships 22 



T, S,8 m distribution at the surface on a BT pass 24 



Oxygen distribution 25 



Nitrogen as nitrite and nitrate 26 



Chlorophyll a distribution 28 



Productivity 28 



Zooplankton and micronekton distribution 28 



Miscellaneous observations 41 



Front 1 42 



Front 2 42 



Front 4 46 



Summary 50 



Recommendations 50 



Acknowledgments 50 



Literature cited 51 



FIGURES 



1. Map of (i) track of STOR cruise TO-60-1 (May 1960), showing hydrocasts, including 



10-m. bottle casts, ( — • — ), and between- station BT's ( — o — ); (ii) part of the track 

 of CalCOFI cruise 6004-B (April 1960), showing full hydrocast stations (--o--); and 

 (iii) areas in which fronts were studied, including front 5, cruise TO-61-1 (April 

 1961) 



2. Surface isotherm contours (interval 1° C.) from data of cruises TO-60-1 and 6004-B 



(CalCOFI). The approximate relation of the fronts to this distribution can be seen by 

 comparing this figure with figure 1 (-,.,. speculative contour) 



3. Temperature profile to 600 m. based on datafrom hydrocast stations 7 - 22, TO-60-1; 

 the dashed isotherms (19°, 20° C.) are from BT data and represent a feature not 

 detected by the sampling pattern of hydrocast stations (figs. 1 and 2). Contour 

 interval: 1° C. Note the boundaries (0.1 ml. 1 . - 1) of the oxygen minimum layer . . . 



