Finnish Environment Institute, Mechelininkatu 34 a, P.O. Box 140, 00251, Helsinki, Finland.
Environ Monit Assess. 2010 Feb;161(1-4):359-68. doi: 10.1007/s10661-009-0753-8. Epub 2009 Feb 19.
The water quality monitoring data of eight rivers situated in the Finnish Lapland above the Arctic Circle were investigated. These rivers are icebound annually for about 200 days. They belong to the International River Basin District founded according to the European Union Water Framework Directive and shared with Norway. They are part of the European river monitoring network that includes some 3,400 river sites. The water quality monitoring datasets available varied between the rivers, the longest comprising the period 1975-2003 and the shortest 1989-2003. For each river, annual medians of eight water quality variables were calculated. In addition, medians and fifth and 95th percentiles were calculated for the whole observation periods. The medians indicated good river water quality in comparison to other national or foreign rivers. However, the river water quality oscillated widely. Some rivers were in practice in pristine state, whereas some showed slight human impacts, e.g., occasional high values of hygienic indicator bacteria.
对位于北极圈以上的芬兰拉普兰的 8 条河流的水质监测数据进行了调查。这些河流每年有大约 200 天被冰封。它们属于根据欧盟水框架指令设立的国际河流流域区，并与挪威共享。它们是包括约 3400 个河流监测点的欧洲河流监测网络的一部分。可用的水质监测数据集在河流之间有所不同，最长的数据集包括 1975 年至 2003 年，最短的数据集包括 1989 年至 2003 年。为每条河流计算了 8 个水质变量的年度中位数。此外，还为整个观测期计算了中位数和第 5 百分位数和第 95 百分位数。与其他国家或外国河流相比，这些河流的水质中位数表明了良好的水质状况。然而，河流水质波动很大。有些河流实际上处于原始状态，而有些河流则显示出轻微的人为影响，例如卫生指示菌偶尔出现高值。
