Spatial and seasonal variations in attenuation of solar ultraviolet radiation in Lake Biwa, Japan.
Spatial and seasonal variations in attenuation of solar ultraviolet radiation in Lake Biwa, Japan.
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DOI：
10.1016/j.jphotobiol.2007.11.008
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发表时间：
2008-02
期刊：
影响因子：
--
通讯作者：
K. Hayakawa;Yuko Sugiyama
中科院分区：
文献类型：
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作者：
K. Hayakawa;Yuko Sugiyama
在琵琶湖的中上层和沿岸浅水区，监测了湖泊水体中漫射紫外线（UV）和可见光衰减的季节变化以及固有的光学特性。琵琶湖在一个大的水体中具有广泛的光学条件。我们考虑了影响紫外衰减的吸收因素，并通过对监测数据的多元回归分析，明确了悬浮颗粒和显色性溶解有机物（CDOM）的吸收贡献。湖内紫外线衰减的变化在上层和浅层之间表现出强烈的对比。后者以提供悬浮物和CDOM的混浊系统为特征，而前者与滨海带或湖底的混浊系统相去甚远。在该湖泊中，湖水对悬浮粒子和CDOM的吸收使紫外线和光衰减的调节具有竞争性，因此，紫外线穿透量具有基于湖泊物理和生物条件变化的时空变异性。
Seasonal changes in diffuse ultraviolet (UV) and visible light attenuations and inherent optical properties in the lake water were monitored at the pelagic and littoral shallow zones of Lake Biwa which features a broad range of optical conditions within a single large water body. We considered the absorption factors that affect UV attenuation, and clarified the contribution of the absorption of suspended particles and chromophoric dissolved organic matter (CDOM) by multiple regression analyses of the monitoring data. The variability of UV attenuations in the lake demonstrated a strong contrast between the pelagic and the shallow zones. The latter were characterized by turbid systems supplying suspended matter as well as CDOM, whereas the former was far from the turbid systems in the littoral zone or the lake bottom. In this lake, the regulation of UV and light attenuations is rendered competitive by the absorption of suspended particles and CDOM in the lake water, hence, the UV penetration has both spatial and temporal variability based on changes in the physical and biological condition of the lake.