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首页> 外文期刊>Lakes & Reservoirs >Optical and biological properties of Lake Ülemiste, a water reservoir of the city of Tallinn I: Water transparency and optically active substances in the water
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Optical and biological properties of Lake Ülemiste, a water reservoir of the city of Tallinn I: Water transparency and optically active substances in the water

机译：塔林市水库Ülemiste湖的光学和生物特性I：水中的水透明性和光学活性物质

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摘要

Optical and biological measurements were performed in Lake Ülemiste in the summer of 1997 (four measurement days), and from May to October in 1998 (12 measurement days). This kind of data, describing the type and amount of optically active substances in the water, phytoplankton characteristics, the underwater light field, and temperature–oxygen situation in the lake are necessary when estimating the ecological state of the lake. Lake Ülemiste is the main drinking water reservoir of Tallinn, the capital of Estonia. Phytoplankton abundance and biomass, chlorophyll a and suspended matter were determined from collected Lake Ülemiste water samples in the laboratory. Spectrophotometrical processing of the filtered and unfiltered water was carried out to describe the beam attenuation coefficient spectra and optical influence of yellow substance in the water. Vertical profiles of downwelling irradiance of the PAR (400–700 m) region of the spectrum (and from these data the averaged over depth diffuse attenuation coefficient) were determined. The relative transparency of the water was estimated by using a Secchi disk. Passive optical remote measurements were episodically made from aboard a boat. Results obtained confirmed that Lake Ülemiste is turbid (almost hypertrophic), comparable with most turbid lakes in Estonia (e.g. Lake VÕrtsjrv) and Finland (Lake Tuusulanjrvi). Its chlorophyll a content varied within the range 13–121 mg m–3, phytoplankton biomass 3–107 mg L–1, phytoplankton abundance 65 000–999 000 mL–1, suspended matter 8–34 mg L–1, effective concentration of the yellow substance 6–30 mg L–1, diffuse attenuation coefficient of light in the PAR region 1.0–3.3 m–1 and a Secchi disk depth of 0.5–1.75 m. The temporal variation of the spatial averages of these parameters during 1998 was analysed. Almost all characteristics showed an increase from May to midsummer with a maximum in late July or in August (correspondingly the Secchi depth values were minimal in late summer). The amount of yellow substance was an exception, which was nearly constant during the observation period. The maximum level of chlorophyll a content in July and August 1998 markedly exceeded that in 1997, despite the fact that the summer of 1997 was sunny, but the summer of 1998 was cold and rainy. The correlative relationships between the different parameters were investigated together with the respective data for other lakes. They show that the data of Lake Ülemiste supplemented the correlation graph in the region of turbid lakes, whereby in all cases the correlation coefficient increased following the addition of Lake Ülemiste data. The highest correlation coefficient was obtained when light attenuation coefficient values were correlated with a sum of weighted concentrations of chlorophyll a, yellow substance and suspended matter (multiple regression analysis).
机译：光学和生物测量分别于1997年夏天（四个测量天）和1998年5月至10月（12个测量天）在Ülemiste湖中进行。在估算湖泊的生态状态时，需要此类数据来描述水中光学活性物质的类型和数量，浮游植物的特征，水下光场以及湖泊中的温度-氧气状况。 Ülemiste湖是爱沙尼亚首都塔林的主要饮用水水库。在实验室中从收集的乌勒米斯湖水样中确定了浮游植物的丰度和生物量，叶绿素a和悬浮物。对已过滤和未过滤的水进行分光光度法处理，以描述光束衰减系数光谱和水中黄色物质的光学影响。确定了光谱的PAR（400-700 m）区域的下降流辐照度的垂直分布（并根据这些数据对深度扩散衰减系数进行了平均）。水的相对透明度通过使用Secchi圆盘估算。被动光学远程测量是从船上进行的。获得的结果证实，乌勒姆斯提湖是浑浊的（几乎肥大），可与爱沙尼亚（如伏尔茨杰夫湖）和芬兰（Tuusulanjrvi湖）的大多数浑浊的湖泊相媲美。其叶绿素a含量在13–121 mg m–3，浮游植物生物量3–107 mg L–1，浮游植物丰度65 000–999 000 mL-1，悬浮物8–34 mg L-1，有效浓度范围内变化。黄色物质6–30 mg L–1，在PAR区域的光的扩散衰减系数为1.0–3.3 m–1，塞奇圆盘深度为0.5–1.75 m。分析了1998年这些参数的空间平均值的时间变化。几乎所有特征都显示从5月到盛夏增加，在7月下旬或8月达到最大值（相应地，Secchi深度值在夏末最小）。黄色物质的数量是一个例外，在观察期内几乎恒定。尽管1997年夏天是晴天，但1998年夏天是阴雨多雨，1998年7月和1998年8月叶绿素a的最高含量明显超过了1997年。研究了不同参数之间的相关关系以及其他湖泊的相应数据。他们表明，乌勒迈斯提湖的数据补充了浑浊湖泊区域的相关图，从而在所有情况下，随着乌勒迈斯提湖数据的增加，相关系数都增加了。当光衰减系数值与叶绿素a，黄色物质和悬浮物的加权浓度之和相关时，获得最高的相关系数（多元回归分析）。

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  • 来源
    《Lakes & Reservoirs》 |2001年第1期|63-74|共12页
  • 作者

    A. Erm; H. Arst; T. Trei; A. Reinart; M. Hussainov;

  • 作者单位

    Estonian Marine Institute Viljandi Road 18b 11216 Tallinn Estonia and;

    Estonian Marine Institute Viljandi Road 18b 11216 Tallinn Estonia and Estonian Marine Institute Viljandi Road 18b 11216 Tallinn Estonia and;

    Tallinn Water Ltd Jrvevana Road 3 10132 Tallinn Estonia;

    Estonian Marine Institute Viljandi Road 18b 11216 Tallinn Estonia and;

    Estonian Marine Institute Viljandi Road 18b 11216 Tallinn Estonia and;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    lake optics; limnology; water constituents; water reservoirs;

    机译：湖泊光学;语言学;水成分;水库;

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