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Decadal oscillations of the aquatic chemistry of river waters in Latvia

机译：拉脱维亚河水的水生化学的年代际振荡

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Water quality changes of surface waters can be used to assess human impact intensity, but of importance is to consider also impacts of climate change/variability and naturally occurring changes of environmental quality. In Latvia, during the recent decades a major reduction of anthropogenic pressure has happened due to restructuring of economy and industrial production, resulting in major decrease of loading of many groups of pollutants. However, trends and driving factors for other groups of substances have not been much studied. Long term (1980a??2012) results of hydrochemical monitoring, performed in rivers of Latvia, are analysed during this study in connection with long-term sets of hydrological and heliophysical data, using standard statistical approaches. Our results indicate that variation of some hydrochemical values, for example COD and total Fe, show clearly visible decadal oscillated character, while variation of some other values, for example phosphate P and total P, show some individual characteristics of decadal oscillations. These results indicate the presence of a large scale, geochemical and geophysical significant process multiannual pulse of catchment, driven by variation of solar irradiance through complex interactions between global atmospheric circulation, groundwater and surface waterbodies. The process described in our study is significant from a geochemical point of view and must be taken into account in prediction of water quality and quantity. Impacts of natural processes should be considered in the planning of environmental policy.
机译：地表水的水质变化可用于评估人类的影响强度，但重要的是还要考虑气候变化/可变性的影响以及自然发生的环境质量变化。在拉脱维亚，近几十年来，由于经济和工业生产的结构调整，人为压力已大大降低，导致许多污染物类别的负荷大大降低。但是，尚未对其他物质类别的趋势和驱动因素进行太多研究。在这项研究中，使用标准统计方法，结合长期的水文和日射物理数据，分析了拉脱维亚河流中进行的水化学监测的长期结果（1980a – 2012年）。我们的结果表明，某些水化学值的变化（例如COD和总Fe）显示出清晰可见的年代际振荡特征，而其他一些值的变化（例如磷酸盐P和总P）则表现出某些年代际振荡特征。这些结果表明，由于全球大气环流，地下水和地表水体之间复杂的相互作用，太阳辐照度发生变化，导致存在大规模，地球化学和地球物理重要过程的集水年度脉冲。从地球化学的角度来看，我们研究中描述的过程意义重大，在预测水质和水量时必须考虑到这一过程。在规划环境政策时应考虑自然过程的影响。

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