GEOLOGY

Detailed explanation-1: -Water temperture affects dissolved-oxygen concentrations in a river or water body. As the chart shows, the concentration of dissolved oxygen in surface water is affected by temperature and has both a seasonal and a daily cycle.

Detailed explanation-2: -Temperature and dissolved oxygen have an inverse relationship so, as temperature increases, dissolved oxygen decreases. This happens because an increase in temperature causes gas and water molecules to gain energy.

Detailed explanation-3: -Oxygen enters water by direct absorption from the atmosphere, which is enhanced by turbulence (see Figure 1). Water also absorbs oxygen released by aquatic plants during photosynthesis.

Detailed explanation-4: -Ocean warming-driven deoxygenation: Warmer ocean water holds less oxygen and is more buoyant than cooler water. This leads to reduced mixing of oxygenated water near the surface with deeper waters, which naturally contain less oxygen. Warmer water also raises oxygen demand from living organisms.

Detailed explanation-5: -How Dissolved Oxygen Affects Water Supplies. A high DO level in a community water supply is good because it makes drinking water taste better. However, high DO levels speed up corrosion in water pipes. For this reason, industries use water with the least possible amount of dissolved oxygen.