xii Contents 



Chapter Five 



THE HYDROGRAPHY OF THE GULF STREAM 44 



Atlantis Sections of the Gulf Stream, 1931-1939 — Bathy- 

 thermograph Sections — Meanders and Eddies — Velocity 

 Determinations Across the Stream — Velocity Sections 

 by Direct Measurement — Problems of Contouring — The 

 Strategy of Exploration — Transfer Processes Across the 

 Stream — Sources of the Gulf Stream Water Masses — The 

 Florida Current — The North Atlantic Cmrent 



Chapter Six 



THE WIND SYSTEM OVER THE NORTH 



ATLANTIC 75 



Normal Circulation — Interruptions in the Normal Circu- 

 lation—The Wind Stress on the Ocean 



Chapter Seven 



LINEAR THEORIES OF THE GULF STREAM 83 



The Theory of Wind-driven Ocean Currents — Westward 

 Intensification — Munk's Theory of the Wind-driven 

 Ocean Circulation 



Chapter Eight 



NONLINEAR THEORIES OF THE GULF STREAM 104 



Rossby's Wake-Stream Theory — Lateral IVIixing — The 

 Potential Vorticity of a Layer of Uniform Density — The 

 Potential Vorticity in an Isopycnal Layer — Model \\4th 

 Uniform Potential Vorticity — The Region of Decay of 

 the Gulf Stream — The Critical Internal Froude Number — 

 The Boundary-Layer Technique — The Inertial Theories of 

 Morgan and Charney 



Chapter Nine 



MEANDERS IN THE STREAM 126 



The AppUcation of the Perturbation Method — Gulf 

 Stream Meanders — A Simple Meander Theory for a Very 

 Wide Current in a Stratified Ocean — Stable Meanders in 

 a Stream of Uniform Potential Vorticity 



