The utilization of dissolved organic phosphorus (DOP) driven by alkaline phosphatase hydrolysis contributes significantly to mitigating coastal nitrogen pollution through alleviating phosphorus (P) limitation. However, the lack of a parameterization for this process limits the quantitative assessment of its impact on marine nutrient pollution and cycling. Our study addresses this issue using data from a series of on-board microcosm experiments conducted in the Yellow Sea, where P limitation prevails. In addition to incorporating the conventional temperature-dependent DOP decomposition, we improve this process by accounting for the effects of dissolved inorganic phosphorus (DIP) and dissolved inorganic nitrogen (DIN) on DOP utilization, based on well-established relationships among these variables. The improved model well reproduces nutrient dynamics observed during the incubations. Simulation results further indicate that DOP utilization can contribute up to 80% of bioavailable P in DIP-deficient environments. Without this process, DIP concentrations would decrease by over 50% within 2 - 5 days, leading to a 20% - 60% decrease in chlorophyll a concentration and an approximately 100% increase in P turnover time. Moreover, the DOP-to-DIP conversion efficiency (i.e., DOP utilization rate) exhibits substantial spatiotemporal variability in surface seawater, with rates as high as 0.1 day