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首页> 外文会议>OCEANS >Detection of Karenia brevis harmful algal blooms in the West Florida Shelf using red bands of MERIS imagery
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Detection of Karenia brevis harmful algal blooms in the West Florida Shelf using red bands of MERIS imagery

机译：在西佛罗里达州架子上使用红斑狼架的Karenia Brevis有害藻类盛开

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Karenia brevis (K. brevis) blooms regularly in the Gulf of Mexico. However, detection from space still remains a challenge using standard bio-optical retrieval algorithms because of the uncertainties of atmospheric correction and spectral interferences arising in optically complex coastal waters from high concentrations of organic and inorganic materials. We propose a simple red band difference (RBD) technique to detect blooms, coupled with a normalized difference technique to distinguish k. brevis blooms specifically, which we label as the K. brevis bloom index (KBBI). K. brevis blooms studied include those from the Medium Resolution Imaging Spectrometer (MERIS) ocean color measurements off the West Florida Shelf (WFS). As is known, K. brevis has low backscatter characteristics, and as a consequence, it is the chlorophyll fluorescence that dominates the red water-leaving radiance signals (over any elastic scatter). The proposed techniques take advantage of this dominance of the fluorescence signal. With the red water leaving reflectance dominated by fluorescence, which is the case for K. brevis, the reflectance spectra has a local minimum around 665 nm (band 7) and the signal at 681 nm (band 8), which falls in the shoulder of the reflectance peak, has higher values than the signal at band 7 due to the chlorophyll fluorescence emission centered around 685 nm.
机译：Karenia Brevis（K.Brevis）定期在墨西哥湾定期开花。然而，由于大气校正的不确定性和来自高浓度的有机和无机材料的光学复杂的沿海水域出现的气相校正和光谱干扰，因此仍然是使用标准生物光学检索算法的挑战。我们提出了一种简单的红频段差异（RBD）技术来检测盛开，与归一化差异技术耦合以区分k。 Brevis绽放，我们将其标记为K.Brevis Bloom Index（KBBI）。 k。学习的Brevis Blooms包括来自中佛罗里达州架子（WFS）的中分辨率成像光谱仪（Meris）海洋颜色测量的盛开。众所周知，K.Brevis具有低的反向散射特性，因此，叶绿素荧光是将红色水留辐射信号（在任何弹性散射）上占主导地位。所提出的技术利用荧光信号的这种优势。通过留下由荧光支配的反射率的红色水，这是K.Brevis的情况，反射光谱具有局部最小约665nm（带7），并且在681nm（带8）处的信号落入肩部由于叶绿素荧光发射为中心的叶绿素荧光发射，反射峰值具有比带7的信号更高的值。

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