Color change of lake water at the active crater lake of Aso volcano, Yudamari, Japan: is it in response to change in water quality induced by volcanic activity?
Color change of lake water at the active crater lake of Aso volcano, Yudamari, Japan: is it in response to change in water quality induced by volcanic activity?
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DOI：
10.1007/s10201-009-0304-6
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发表时间：
2010-12-01
期刊：
影响因子：
1.6
通讯作者：
Kagiyama, Tsuneomi
中科院分区：
文献类型：
--
作者：
Ohsawa, Shinji;Saito, Takeshi;Kagiyama, Tsuneomi
火山湖的一个特点是受到湖底存在的水下火山口的影响（称为活动火山口湖），其沃茨的显着颜色：绿松石或翡翠绿色。活跃的火山口湖名为Yudamari山。日本阿索火山的中岳呈现出乳白色的浅蓝绿色。湖水颜色的特定蓝色成分是由非常细的含水胶体硫颗粒对阳光的瑞利散射造成的;绿色成分是由于溶解的亚铁离子对阳光的吸收。在2000-2007年期间进行的客观颜色观察显示，湖水颜色从蓝绿色变为纯绿色。从同时取样的湖沃茨的化学分析中，水颜色的蓝色成分的消失将导致水胶体硫的减少。含水硫是由二氧化硫和硫化氢反应产生的，所述硫化氢由水下的水蒸气提供。然而，其生产效率下降的二氧化硫占主导地位的水下烃硫气体物种随着水下烃温度的增加。蓝绿色湖水中蓝色成分的消失可能是由于水下胆甾醇活性的激活。
One feature of volcanic lakes influenced by subaqueous fumaroles existing at lake bottoms (called active crater lakes) is the remarkable color of their waters: turquoise or emerald green. The active crater lake named Yudamari at Mt. Nakadake of Aso volcano, Japan, takes on a milky pale blue-green. The particular blue component of the lake water color results from Rayleigh scattering of sunlight by very fine aqueous colloidal sulfur particles; the green component is attributable to absorption of sunlight by dissolved ferrous ions. An objective color observation conducted during 2000-2007 revealed that the lake water color changed from blue-green to solid green. The disappearance of the blue ingredient of the water color will result in diminution of aqueous colloidal sulfur from chemical analyses of lake waters sampled simultaneously. The aqueous sulfur is produced by the reaction of sulfur dioxide and hydrogen sulfide supplied from subaqueous fumaroles. However, its production efficiency decreases by domination of sulfur dioxide in the subaqueous fumarolic sulfur gas species with increasing subaqueous fumarolic temperature. The disappearance of blue ingredients from the blue-green color of the lake water may be attributed to activation of subaqueous fumarole activity.