In our July 19 post, we were crossing our fingers that a weather front due on July 20 would indeed end the stifling heat wave and also stir up the waters of western Long Island Sound, which was starting to show signs of deadly low oxygen at its bottom depths.
The front came through too mildly, and dissolved oxygen (D.O.) readings remained at or below the levels for hypoxia over the weekend.
But storms overnight seem to have churned things up. Today’s midday bottom D.O. levels were 4.1 mg/L at Execution Rocks (near the Throgs Neck Bridge) and 3.7 mg/L off of Greenwich. That’s not great but better than the 2.7 and 3.1 readings four days ago.
Generally, a concentration below 3.0 to 3.5 mg/L is when animals can start suffocating.