Influences of Typhoon Size and Translation Speed on Chlorophyll <i>a</i> Response in the Oligotrophic Northwestern Pacific

Abstract Tropical cyclones drive episodic phytoplankton blooms in nutrient‐depleted oceans, but the roles of storm intensity, size, and translation speed remain unclear. Using satellite‐derived chlorophyll a (Chl a ) and typhoon data (2002–2023) from the oligotrophic Northwestern Pacific, we show that typhoon size (R34, radius of 34 kt winds) and translation speed, rather than intensity, dominate Chl a responses. Chl a bursts were concentrated within 2° of the typhoon center and peaked 1–6 days after passage. The strongest Chl a responses occurred with slow, large typhoons, while fast, small typhoons induced the weakest response. When translation speeds were below 4 m/s, both R34 and speed influenced the Chl a response; above 4 m/s, R34 was the primary driver. These results redefine the relative contributions of typhoon parameters to marine productivity, emphasizing size as a critical yet overlooked factor.