Cromwell, T. 1958. Thermocline topography, horizontal 

 currents and "ridging" in the eastern tropical 

 Pacific. Inter-Am. Trop. Tuna Comm. Bull. 

 3:135-164. 



Seasonal charts of thermocline depth in east- 

 ern tropical Pacific. Observed series of 

 east-to-west ridges and troughs. Discovered 

 Costa Rican thermal dome; related currents to 

 thermal structure; thermocline depth is re- 

 lated to enrichment of surface waters. 



KEY WORDS: oceanography, temperature, ther- 

 mocline, depth, season, currents, enrichment, 

 convergence/divergence, upwell ing . 



Cushing, D.H., and R.R. Dickson. 1976. The biological 

 response in the sea to climatic changes. Adv. 

 Mar. Biol. 14:1-122, 



KEY WORDS: climate, oceanography, environ- 

 ment, season, temperature, upwelling, winds. 



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