Abyssal Biogeochemical Gradient Collapse & Global Nutrient Upwelling Crisis

The Abyssal Biogeochemical Gradient Collapse, often abbreviated as ABGC, describes the projected macro-scale failure of major physical mechanisms responsible for transporting limiting nutrients (specifically nitrate, phosphate, and silicate) from deep ocean reservoirs to the sunlit photic zone. This process has historically been fundamental to sustaining global marine productivity, underpinning the planet's primary carbon sequestration capacity and supporting vast marine food webs. ABGC is not predicated on a single local event but rather represents a systemic weakening of oceanic circulation patterns—including major upwelling zones and deep-water mixing—driven by compounding effects of thermal stratification, increasing ocean heat content, and altered solubility gradients resulting from warming and acidification.