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September 10, 2025OceansOpen Access

Dynamics of Oxygen and the Physicochemical Response in Two Comparative Hypoxia Regions

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Analysis reveals the physicochemical impact of hypoxia on dissolved oxygen dynamics in two distinct sites, highlighting contrasting effects.

Dissolved oxygen dynamics are linked to salinity, temperature, turbidity, and chlorophyll-a levels.
Average oxygen change rates were −0.016 to 0.014 mg L−1 d−1 in Baltic Proper and −0.022 to 0.018 mg L−1 d−1 in Shuikou Reservoir.
Persistent hypoxia (DO < 2 mg L−1) in Baltic Proper occurred below 63 m depth, while seasonal hypoxia in Shuikou Reservoir was below 11.5 m in September.
NO3− and NH4+ concentrations in both regions significantly depend on changes in dissolved oxygen levels.

Wei et al. (2025) studied this question.

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Analysis reveals the physicochemical impact of hypoxia on dissolved oxygen dynamics in two distinct sites, highlighting contrasting effects.