Wang Lin, Zhao Dong-Zhi, Yang Jian-Hong, Liu Yong-Jian, Wang Xiang, Zou Xiao-Ge
National Marine Environmental Monitoring Center, Dalian 116023, China.
Huan Jing Ke Xue. 2011 Oct;32(10):2855-60.
Effects of harmful algal bloom (HAB) on bio-optical properties of coastal waters were studied. Bio-optical data were collected from 11 stations in the Dalian Bay, for an analysis of variable characteristics of biological factors, reflectance and absorption spectra as responses to HAB. The results indicated that, (1) the HAB which occurred in the Dalian Bay was caused by picophytoplankton. (2) Remote sensing reflectance showed an obvious difference with the normal waters: the strong absorption of the high concentration chlorophyll-a leaded to two reflection dips near 440 and 632 nm bands, a much larger fluorescence peak height around the red band accompanied by a "red shift", a sharp peak of oxygen response at 760 nm, and an enhanced reflection peak of suspended matter in the near-infrared band. (3) In addition, effects of HAB on absorption coefficient spectrum mainly reflected in the numerical size and much stronger absorption of ocean color constituents than the normal waters had been found, the a(ph) (440), a(ph) (675), a(d) (440) and a(g) (440) increased to 13.4, 14.5, 5.0 and 3.8 times of the values of normal waters, respectively. Variation features of bio-optical elements were examined and identified when HAB occurred in the Dalian Bay, which provides a way to monitor HAB by satellite remote sensing.
研究了有害藻华（HAB）对沿海水域生物光学特性的影响。从大连湾的11个站点收集了生物光学数据，用于分析生物因子、反射率和吸收光谱作为对有害藻华响应的变化特征。结果表明，（1）大连湾发生的有害藻华是由微微型浮游植物引起的。（2）遥感反射率与正常水域有明显差异：高浓度叶绿素-a的强烈吸收导致在440和632纳米波段附近出现两个反射低谷，在红波段附近有一个大得多的荧光峰高并伴有“红移”，在760纳米处有一个明显的氧响应峰，以及在近红外波段悬浮物反射峰增强。（3）此外，发现有害藻华对吸收系数光谱的影响主要体现在数值大小上，海洋颜色成分的吸收比正常水域强得多，a(ph)(440)、a(ph)(675)、a(d)(440)和a(g)(440)分别增加到正常水域值的13.4、14.5、5.0和3.8倍。研究了大连湾发生有害藻华时生物光学要素的变化特征，这为通过卫星遥感监测有害藻华提供了一种方法。
