Abstract

Ocean dead zones—regions with critically low oxygen levels—adversely affect marine life, global ecosystems, and fisheries. Ocean dead zones derive from hypoxia caused by nutrient pollution, primarily from agricultural runoff combined with poorly regulated wastewater and industrial effluent discharges. Pollution promotes excessive algal blooms, and when these blooms die, decomposition leads to hypoxia. The massive dead zone caused by pollution in the Mississippi River's moat is the paradigm case. This paper focuses on the main impacts of eutrophication and the consequences of climate change on ocean circulation, along with their socio-economic impacts. Other socio-economic drivers are examined as case studies to substantiate the need for policy change. This research utilizes remote sensing to model dead zones, integrate a suite of biological monitoring methods, and design control measures to eliminate dead zones and mitigate eutrophication. Promising outcomes anticipate policy harmonization and techno-economic reengineering to combat the extreme proliferation of zones killed on ocean health and the marine economy.

Keywords: Oceanic dead zones, Hypoxia, Eutrophication, Nutrient pollution, Marine ecosystems, Climate change, Mitigation strategies