Oxygen exchange between a ‘model’ pond and the atmosphere

Oxygen exchange between a sheltered ‘model’ farm pond (6 m diameter and 2.5 m deep) and the atmosphere averaged 0.33 m/day for measurements made from April to December. This value was similar to those reported for isolated surfaces in sheltered waters and in laboratory tanks but below those of large, inland waters. Low average wind velocity (0.7 m/sec) probably caused the low O₂ exchange rate. Interactions between air and water temperatures and precipitation may be important factors governing short-term O₂ exchange in highly sheltered waters.