Abstract
An in situ dissolved oxygen sensor was used in conjunction with an STD system to map the oxygen distribution in the thermocline of a 40 km region of the mid-Atlantic Ocean. Features of the oxygen distribution were resolved to better than 0·07 ml 1.−1 and spatially to better than 10 m vertically and 2 km horizontally. An oxygen minimum region was observed at 350 m depth which contained 0·4 ml 1.−1 less oxygen than its surroundings. This layer was 80 m thick, 15 km in the east-west dimension and more than 37 km in its north-south extent. One of the dynamic characteristics of this oxygen minimum over a one-day period included a westward shift of about 4 km. This study demonstrates the small-scale variability which can exist in the oceanic oxygen distribution, and it illustrates the value of continuous in situ oxygen measurements in examining advective and mixing processes.
Published Version
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