Fertilization Potention of Volcanic Dust in the Low-Nutrient Low- Chlorophyll Western North Pacific Subtropical Gyre: Satellite Evidence and Laboratory Study

摘要

In the western North Pacific subtropical ocean, the Anatahan volcano of the Mariana Islands erupted on 10 May 2003 for the first time in recorded history. Based on nine different types of remote sensing data provided by NASA, laboratory experiment of the Anatahan samples, and a 3-D ocean circulation model developed by the U.S. Naval Research Laboratory, the postvolcanic ocean biogeochemical response to the Anatahan eruption was explored. It was observed that soon after the eruption, the aerosol optical depth abruptly increased from the pre-eruption loading of -0.1 to approximately 2. In the week following the eruption, a 'bloom-like' patch was observed by NASA's Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) ocean color sensor. Based on the chlorophyll a, fluorescence line height (FLH), at-sensor total radiance, and normalized water- leaving radiance data obtained by MODIS, the cause of the bloom-like patch was diagnosed.