Multi-satellite observations of chlorophyll-a blooms south of Japan triggered by Typhoon Namtheun(2004)

【摘要】：Chlorophyll-a(Chl-a) blooms caused by typhoon Namtheun(2004) were investigated by combining multi-satellite observations with Argo float profiles and ship-based data.The Namtheun-induced upwelling and vertical mixing caused extreme sea surface cooling(-4~5°C) and significant Chl-a blooms(0.1~0.3 mg/m3),while persistent high magnitude was co-located with the pre-existing cyclonic circulation(SSHA -100 cm).The results indicate that both the typhoon's translation speed and pre-existing cold eddy may play important roles in enhancing the Chl-a concentration.This study implies that to gain deeper insights into ocean surface responses to typhoons,their subsurface dynamics need to be analyzed through more in situ and satellite-based observations and physical and biological models.