KILOMETERS 



NNER BAY 



OUTER BAY 



Figure 13.— Bottom sediments and topography of area near constriction between Inner and Outer Bays, 



Traitors Cove, Alaska. 



Second, because seaward surface transport 

 was greater during the ebb than during flood 

 tides, a greater annount of vertical entrainment 

 or upwelling occurred at the head of Inner Bay 

 during the ebb. This upwelling resulted in a 

 greater transport of nutrients from the deep 

 water of Inner Bay to the head of the bay during 

 ebb tide than during flood tides and was prob- 

 ably the cause of two situations that we ob- 

 served: (1) higher concentrations in April of 

 phosphate and silicate at the head of the bay at 

 low tide than at high, and (2) higher concen- 

 trations in April of chlorophyll a near the head 

 of Inner Bay at low tide (range 1.10-11.47 

 Ag./l.) than at high (range 0.68-1.18 ng./l.)-- 

 possibly because of detritus or phytoplankton 

 in the upwelled water. 



The upwelling near the head of Inner Bay 

 may explain the general decrease in the trans- 

 parency of water in Traitors Cove proceeding 

 from Behm Canal toward the head of Inner 

 Bay. This decrease may have been caused by 

 increasing concentrations of phytoplankton pro- 

 ceeding landward. This possibility is supported 

 by the increasing concentrations of chlorophyll 

 a in August in samples from Behm Canal land- 

 ward. 



The seaward movement of fresh water at the 

 surface of Inner Bay allowed the formation of a 

 temperature maximum layer there in June 

 (fig. 3). As cool fresh water entered from 

 Traitors River, it overrode the denser, though 

 warmer, saline water of Inner Bay, which re- 

 sulted in a cold layer at the surface overlying 



13 



