THE EFFECT OF A COLD-AIR OUTBREAK ON THE CONTINENTAL SHELF WATER OF THE NORTHWESTERN GULF OF MEXICO.
TEXAS A AND M UNIV COLLEGE STATION DEPT OF OCEANOGRAPHY
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Two physical oceanographic cruises with almost identical coverage were conducted over the Texas-Louisiana shelf in January 1966. During the fifteen-day period between cruises, a sustained cold-air outbreak occurred over the survey region. Quasi-synoptic measurements of temperature, salinity and sigma-t document a surface layer which is homogeneous to approximately 100 m or to the bottom for shallower depths during both cruise periods. The horizontal gradients in this layer are largest in the nearshore region less than 25 m depth where isovalues contours generally parallel shore. The maximum temperature gradients increased from .25 degrees Cnaut mi before the outbreak to .80 degrees Cnaut mi after. There is indication that the subsurface salinity maximum of the Gulf of Mexico intersects the homogeneous surface layer over the slope region. The distribution of sigma-t along a horizontal line normal to shore for the surface layer over the shelf resembles the vertical distribution of sigma-t with waters further offshore. Author
- Physical and Dynamic Oceanography