The dropsonde positions are shown in the figure below. The measurement locations are not uniformly distributed throughout the western Arctic Ocean and Beaufort Sea region. Rather, the soundings were made along flight paths, typically diamond-shaped patterns extending from central Alaska to the North Pole.
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Skony, S.M., J.D. Kahl and N.A. Zaitseva, 1994: Differences between radiosonde and dropsonde temperature profiles over the Arctic Ocean. J. Atmos. Ocean. Tech., 11, 1400-1408. View article (pdf)
Locations of 10,326 temperature profiles measured by dropsonde from U.S. Ptarmigan weather reconnaissance aircraft during 1950-1961. The aircraft typically flew diamond-shaped patterns extending from central Alaska to the North Pole. Portions of the flight paths are visible as "streaks" of dropsonde positions. Drops were often made at pre-determined locations, with as many as 500 soundings made at specific points. More than 100 soundings were made at the North Pole.
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