Phaeocystis globosa is the most common species making up harmful algal blooms. For better detect P. globosa bloom, a multispectral approach was developed based on extensive in-situ investigation and MODIS remote sensing reflectance (Rrs) dataset. A novel proxy RPG was created based on the feature of Rrs spectral shape and P. globosa bloom was identified when RPG was >1.6. Normalized Fluorescence Line Height (nFLH) was applied to discriminate the bloom events and nFLH of bloom waters was almost higher than 0.095 Wm−2μm−1sr−1. The RPG associated with nFLH exhibited the P. globosa bloom areas comparable to that in field investigation, which indicated this practical method was successful on the spatial and temporal distribution of P. globosa blooms. Several environmental factors derived from MODIS products and field survey were analyzed to characterize the bloom conditions. Redundancy analysis suggested that nutrients and temperature are vital for triggering P. globosa bloom.

中文翻译：

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使用 MODIS 测量检测 Phaeocystis globosa 水华并表征其在北部湾北部的水华状况


Phaeocystis globosa 是构成有害藻华的最常见物种。为了更好地检测球形藻水华，基于广泛的原位调查和 MODIS 遥感反射率 （Rrs） 数据集开发了一种多光谱方法。基于 Rrs 光谱形状的特征创建了一个新颖的代理 RPG，当 RPG 为 >1.6 时鉴定出 P. globosa 开花。应用归一化荧光线高 （nFLH） 来区分水华事件，水华水的 nFLH 几乎高于 0.095 Wm-2μm-1sr-1。与 nFLH 相关的 RPG 表现出与野外调查相当的 P. globosa 水华区域，这表明这种实用方法在 P. globosa 水华的时空分布上是成功的。分析了来自 MODIS 产品和现场调查的几个环境因素，以描述水华条件。冗余分析表明，养分和温度对于触发 P. globosa 开花至关重要。