Abstract
A threshold to judge partial pressure of CO2 (pCO2) in seawater anomalous is presented for detecting a signal of CO2 leak in the sea. Data observed in a semi-closed bay in Japan shows that variations of pCO2 are large spatiotemporally and that pCO2 is negatively correlated with dissolved oxygen. Because of these features, a constant pCO2 value is improper for the threshold. It would be liable to bring many false-positives in hypoxic water and false-negatives in oxygen-rich water. The threshold newly presented in this paper is the upper limit of a prediction interval of a linear regression on dissolved oxygen saturation versus pCO2 plane. Since this threshold is decreasing function of dissolved oxygen saturation, it overcomes the difficulties in the constant pCO2 threshold: many false-positives in oxygen-poor water and false-negatives in oxygen-rich water.
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