see in the top picture, there is a very strong density current 
occurring over the shoal. There is, in this case, mid-level 
outflow similar to that occurring in Baltimore Harbor. 
I'll just say in closing that we are riding a new wave of 
understanding. One of the most important recent events in the 
studies of San Francisco Bay was when NOAA/National Ocean 
Service, with cooperation from USGS, did a sea level and current 
meter survey in 1980. We're at the point now where we're fully 
involved in the interpretation of this data set. For those 
people interested in further information, we have recently 
prepared an article summarizing the current state of under¬ 
standing of circulation and mixing in San Francisco Bay (Walters 
et. al. 1985). 
REFERENCES 
Cloern, J.E., 1979: Phytoplankton ecology of the San Francisco 
Bay system: The status of our current understanding, in 
T.J. Conomos (ed.), San Francisco Bay: The Urbanized 
Estuary . Pacific Division, American Association for the 
Advancement of Science, San Francisco, Ca. 64-72. 
Conomos, T.J., 1979: Properties and circulation of San Fran¬ 
cisco Bay waters, in T.J. Conomos (ed.), San Francisco Bay: 
The Urbanized Estuary . Pacific Division, American Associa¬ 
tion for the Advancement of Science, San Francisco, Ca. 
38-50. 
Walters, R.A., R.T. Cheng, and T.J. Conomos, 1985: Time scales 
of circulation and mixing processes of San Francisco Bay 
waters. Hvdrobioloaia 129:13-36. 
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