Data collected by the Maryland Department of Natural Resources (DNR) and Old Dominion University show that dissolved oxygen conditions in the Chesapeake Bay mainstem of Maryland and Virginia were better than average in June 2022. The hypoxic water volume — waters with less than 2 mg/l oxygen — was 0.51 and 0.98 cubic miles during early and late June monitoring cruises, compared to historical early and late June averages (1985-2021) of 0.87 and 1.31 cubic miles.
During their respective time periods, the early June volume ranks as the 8th best on record and late June was 12th best. Additionally, a small volume of less than 0.1 cubic miles of anoxia – waters with less than 0.2 mg/l oxygen – was observed during the late June cruise. Hypoxia was essentially zero (0.0002 cubic miles) in May.
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