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首页> 外文会议>International conference on remote sensing for marine and coastal environments >Close range, hyerspectral reflectance measurements of healthy indo-pacific and Caribbean corals
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Close range, hyerspectral reflectance measurements of healthy indo-pacific and Caribbean corals

机译：近距离，健康印度和加勒比珊瑚的Hyerspectral反射率测量

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Close range reflectance measurements were made with healthy coral specimens in the northern Red Sea at Eilat, Israel and in the western Caribbean Sea at Roatan and Barbareta Islands, Honduras. Measurements were made with an Ocean Optics SD 1000 spectroradiometer and 20 m fiber optics cables with the fiber tips held by SCUBA divers in a nadir view about 3-5 cm above the coral surface. We used healthy specimens, growing at depths between about 1 and 7 meters, with no obvious patterns of physical disturbance, bleaching, or disease. No attempts were made in this study to measure community structure at or above the water surface. We particularly focused on spectral absorption features related to the algal symbionts of corals. Absorption troughs related to specific pigments such as chlorophyll a and major carotenoids were evident in most spectra. Light reflectance by corals is largely explainable by the interaction of white mineral layer scattering and absorption patterns by endosymbiotic algae. A strong chlorophyll a absorption feature near 670 nm and a red edge effect with strongly higher NIR reflectance was consistently observed.
机译：近距离反射测量是在红海北部在以色列埃拉特健康的珊瑚标本和西部加勒比海在罗丹和Barbareta群岛，洪都拉斯提出了一些。测量与在大约3-5厘米的珊瑚表面上方的天底视图由潜水员保持的纤维尖端海洋光学SD 1000分光辐射且20μm光纤电缆制造。我们用健康的标本，在水深约1 7米之间越来越大，与物理干扰，漂白，或疾病没有明显的模式。没有试图在这项研究，以衡量社会结构上或在水面上制造。我们特别关注涉及到珊瑚藻共生光谱吸收特性。与特定颜料如叶绿素和类胡萝卜素主要吸收波谷最谱明显。由珊瑚光反射率是通过的白色矿物层的散射和吸收图案由内共生藻类的相互作用很大程度上解释的。一个强大的叶绿素近670nm的吸收特征，用强烈更高NIR反射红色边缘效应持续观察到。

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