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Regional and general

机译:区域和一般

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The current study focuses on trends in hydrophysical and chemical parameters (e.g. temperature, salinity, dissolved oxygen, chlorophyll a (Chl a), pH and nutrients) in the Estonian coastal sea and offshore areas in relation to the biogeochemical processes and marine carbon dioxide system of the Baltic Sea. Analysis of 586 time series of these parameters, retrieved during national monitoring activities in 1993-2017, revealed a number of significant trends, which characterize the changes in the northeastern (NE) Baltic Sea. The number of significant trends in the surface layer was slightly higher in the coastal sea area than in the offshore area. No significant (e.g. climate changerelated) temperature trends were revealed in the surface layers of the Estonian offshore area. Over a longer time frame (since the 1970s-1980s), the trends in hydrochemical parameters have shown improved ecological conditions in the Estonian coastal waters, however, further improvement is not so obvious. In fact, most nutrient trends were positive over the last two decades. A positive Chl a trend was detected in the offshore area of the Baltic Proper. Dissolved oxygen trends in the bottom layers were all negative. So far, not enough parameters have been monitored for the evaluation of marine acidification processes. Several important recommendations for further improvement of monitoring programmes are suggested.
机译:目前的研究侧重于爱沙尼亚沿海海洋和海上地区的流动物理和化学参数(例如温度,盐度,溶解氧,叶绿素A(CHL A),pH和营养素的趋势,与生物地球化学过程和海洋二氧化碳系统相关波罗的海。在1993 - 2017年国家监测活动期间检索了586次这些参数的分析,揭示了许多重要趋势,其特征在于东北(NE)波罗的海的变化。沿海地区的表面层的显着趋势的数量略高于离岸区域。在爱沙尼亚海上地区的地表层中没有显着(例如气候调整)温度趋势。超过较长的时间框架(自20世纪70年代 - 1980年代以来),水化学参数的趋势表明了爱沙尼亚沿海水域中的生态条件改善,然而,进一步的改进并不明显。事实上,在过去的二十年中,大多数营养趋势都是积极的。在波罗的海的海上地区发现了一个趋势。底层溶解的氧趋势是阴性的。到目前为止,还没有得到足够的参数,用于评估海洋酸化过程。提出了有关进一步改善监测计划的一些重要建议。

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  • 来源
    《Oceanographic Literature Review》 |2020年第6期|1199-1200|共2页
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