Using a multi-proxy approach, significant decoupling of export productivity and organic carbon burial since 45 ka was found to be constrained by ocean dynamics. During the cold glacial and deglacial stadial (i.e., Heinrich Stadial 1) periods, the enhanced North Pacific Intermediate Water (NPIW) prevented the nutrient-rich deep water from being upwelled to the euphotic zone, leading to low export productivity indicated by low contents of carbonate. Meanwhile, the declined sea level caused the weakening of the KC and the deoxygenation of the bottom water, so the organic carbon was effectively buried in anoxic sediments due to anaerobic respiration proved by high sulfur contents and degree of pyritization, which increased the oceanic CO₂ sequestration capacity. In contrast, during the warming Bølling-Allerød and Holocene periods, the export productivity increased due to the upwelling of deep nutrient-rich deep water induced by the weakened NIPW, which is indicated by high carbonate contents. However, the organic carbon was poorly preserved and returned to the ocean by aerobic respiration as reflected in a low degree of pyritization and sulfur contents, which is attributed to the oxygenation of the bottom water as a result of the highly dynamic KC. We propose that ocean dynamic, at least in the subtropical West Pacific, could affect the ability of deep waters and sediments to store carbon by modulating the surface export productivity and the oxygenation of the bottom water.