text: A warming climate increases surface temperatures of waters which affects multiple aspects of euxinic water formation. As waters warm, the solubility of oxygen decreases, allowing for deep anoxic waters to form more readily. Additionally, the warmer water causes increased respiration of organic matter leading to further oxygen depletion. Higher temperatures enhance the hydrologic cycle, increasing evaporation from bodies of water, resulting in increased precipitation. This causes higher rates of weathering of rocks and therefore higher nutrient concentrations in river outflows. The nutrients allow for more productivity resulting in more marine snow and subsequently lower oxygen in deep waters due to increased respiration.
  Volcanism has also been proposed as a factor in creating euxinic conditions. The carbon dioxide (CO) released during volcanic outgassing causes global warming which has cascading effects on the formation of euxinic conditions.