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STS062-86-196
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Spacecraft nadir point: 19.0° N, 67.6° E

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Spacecraft Altitude: 163 nautical miles (302km)
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Image Caption: STS062-87-153 Saint Lawrence River

The Saint Lawrence River can be seen just below the tail of the Space
Shuttle in this northwest looking panoramic view. From Lake Ontario to
the Atlantic Ocean, the Saint Lawrence River flows some 750 km. Just
above the Saint Lawrence and to the left of the shuttle tail is the
circular, 100 km wide Manicouagan impact crater. To the right center
of the view is the Gulf of Saint Lawrence. The view along the coast
includes Cape Cod on the lower left to the Bay of Fundy, and Nova
Scotia to the lower right. W147




The photo depicts many of the types of ocean features seen when illuminated by sunglint. These features include a shear line, bilge dump, currents, and ship wakes. Winds, currents and oils effect the smoothness of the surface of the water. The oils smooth the water which reflect the sun more than the rougher surrounding water. This is seen in the bright curved line which is a bilge dump of oily water from a ship. The oils then start to take the form of the currents and in this case are also being blown by the surface winds. The shear line is approximately 240 miles west of Bombay, India. This shear line appears to be a result of two water masses, moving at slightly different speeds, having converged. Ship wakes, such as those in the photo, which cross a shear line, often give us an indication of the relative strength of a shear.