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This eastward acceleration of the surface waters caused a large shear above the top of the thermocline ( shown as the blue line ) . An incidental advantage of the ` non-interpolating ' scheme over the ` fully interpolating ' scheme is that it resolves any ambiguities about the treatment of departure points above the top model level or below the bottom model level ; the modified departure points automatically lie on the top or bottom level . The red sun rose rapidly above the tops of the blazing pines , and its glow burst into the gulf , about the very doorstep on which Thea sat . It rises at times above the top branches of the highest of our forest trees , whilst in pursuit of large beetles , and at other times sails low and swiftly over the fields , or through the woods , in search of small birds , field-mice , moles or wood-rats , from which it chiefly derives its subsistence . Only limited dexterity is required to quickly obtain an exact volume ; as a safety lip is provided above the top surface of the fluent material which is limited by the weir height above a base of the container . Above the top of the thermocline , the surface layer currents are mainly wind driven .