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A data fusion study on the impacts of the 2011 Japan tsunami on the marine environment of Sendai Bay

机译:2011年日本海啸对仙台湾海洋环境影响的数据融合研究

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Visible and thermal data retrieved by Moderate Resolution Imaging Spectroradiometer-Aqua (MODIS) were analysed using an image and data fusion approach to understand the marine environment changes associated with the 2011 Japan tsunami, with special emphasis on elucidating changes in the bio-optical and thermal variables. Two days after the tsunami, the MODIS visible sensor observed the increase in phytoplankton biomass (chlorophyll-a concentration [Ch1-a]) 10 times (3.3mg m~(-3)) pre-tsunami Chl-a. The large increases in the MODIS Chl-a in the coastal and offshore waters were likely to be, respectively, more associated with high suspended sediment and gelbstoff/detritus loaded from the land by backwash. An intense phytoplankton growth due to horizontal and vertical nutrient fluxes could not be the only mechanism underlying the Chl-a increase, as sea surface temperature was relatively low and stable during the period of study. Hence, using a data fusion approach, we found the two different mechanisms underlying Chl-a enhancements after the Japan tsunami. The image and data fusion techniques can provide valuable preliminary information for further studies dealing with environmental changes due to the tsunami.
机译:使用图像和数据融合方法分析了由中等分辨率成像光谱仪-Aqua(MODIS)检索到的可见和热数据,以了解与2011年日本海啸有关的海洋环境变化,特别着重于阐明生物光学和热学的变化变量。海啸发生两天后,MODIS可见传感器观测到海啸发生前Chl-a的浮游植物生物量(叶绿素a浓度[Ch1-a])增加了10倍(3.3mg m〜(-3))。沿海和近海水域MODIS Chl-a的大量增加可能分别与高悬浮物和通过反冲洗从土地上装载的gelbstoff /碎屑有关。由于水平和垂直养分通量引起的浮游植物的强烈生长可能不是Chl-a增加的唯一机制,因为在研究期间海表温度相对较低且稳定。因此,使用数据融合方法,我们发现了日本海啸后Chl-a增强的两种不同机制。图像和数据融合技术可以提供有价值的初步信息,以便进一步研究海啸造成的环境变化。

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