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Abstract <p>Methods for determining the oxygen concentration in the Black Sea waters were compared. The data obtained using an optical oxygen sensor installed on Bio-Argo floats are in good agreement with the data obtained by the Winkler method on different isopycnal surfaces. The difference between the field and sensor data was ΔO<sub>2</sub> = 12 μmol/kg and 4% at σ<sub>t</sub> = 15.6; 9 μmol/kg and 3% at σ<sub>t</sub> = 15.8; 4.5 μmol/kg and 1.5% at σ<sub>t</sub>&#xa0;= 16.0; and 1.3 μmol/kg and 0.4% at σ<sub>t</sub> = 16.2. A comparison of the field data with the data obtained by the optical oxygen sensor of the <i>INDRONAUT</i> probe showed a significant discrepancy: ΔO<sub>2</sub> = –30 μmol/kg and –10% at σ<sub>t</sub> = 15.6; –13 μmol/kg and –5% at σ<sub>t</sub> = 15.8; –4 μmol/kg and –2% at σ<sub>t</sub> = 16.0; and 1.3&#xa0;μmol/kg and –0.5% at σ<sub>t</sub> = 16.2. This sensor requires calibration and subsequent evaluation of the measurement accuracy. In future, data from the oxygen sensor will allow more accurate determination of the fine structure of the vertical distribution of oxygen and more accurate location of the boundary of the suboxygen zone in the Black Sea.</p>

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Comparison of Methods for Measuring Dissolved Oxygen in the Black Sea Waters

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • A. V. Masevich,
  • I. N. Mukoseev

摘要

Abstract

Methods for determining the oxygen concentration in the Black Sea waters were compared. The data obtained using an optical oxygen sensor installed on Bio-Argo floats are in good agreement with the data obtained by the Winkler method on different isopycnal surfaces. The difference between the field and sensor data was ΔO2 = 12 μmol/kg and 4% at σt = 15.6; 9 μmol/kg and 3% at σt = 15.8; 4.5 μmol/kg and 1.5% at σt = 16.0; and 1.3 μmol/kg and 0.4% at σt = 16.2. A comparison of the field data with the data obtained by the optical oxygen sensor of the INDRONAUT probe showed a significant discrepancy: ΔO2 = –30 μmol/kg and –10% at σt = 15.6; –13 μmol/kg and –5% at σt = 15.8; –4 μmol/kg and –2% at σt = 16.0; and 1.3 μmol/kg and –0.5% at σt = 16.2. This sensor requires calibration and subsequent evaluation of the measurement accuracy. In future, data from the oxygen sensor will allow more accurate determination of the fine structure of the vertical distribution of oxygen and more accurate location of the boundary of the suboxygen zone in the Black Sea.