Dissolved oxygen concentration measurements have been determined for seawater samples collected from Station ALOHA during every HOT cruise. The HOT program has continued for 15 years, and dissolved oxygen concentration data have been collected from over 150 cruises. During this time, several significant changes in methodology have been implemented to improve the exactness and efficiency of the oxygen concentration measurements.

     The scope of this report is to assess the quality of the bottle dissolved oxygen data and, ultimately, to make recommendations regarding the relative reliability of individual data sets and about possible corrections. The major changes that have occurred in the measuring methods (Sect. 2) and their effects on data quality will be discussed (Sect. 3), and the quality of HOT cruise data will be determined based on comparisons of analytical precision and accuracy over time (Sect. 4).

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