Spatial and temporal variability in nutrient concentrations in Liverpool Bay, a temperate latitude region of freshwater influence
Spatial and temporal variability in nutrient concentrations in Liverpool Bay, a temperate latitude region of freshwater influence
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受淡水影响的温带纬度地区利物浦湾养分浓度的时空变化
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
H. Lees
中科院分区：
文献类型：
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作者：
N. Greenwood;D. Hydes;C. Mahaffey;A. Wither;J. Barry;D. Sivyer;David J. Pearce;S. Hartman;O. Andres;H. Lees
本文介绍了2003 - 2009年利物浦湾营养物质的时空分布数据，并对主要河流的营养物质输入进行了分析。利物浦湾冬季营养物浓度的空间分布受河流淡水与爱尔兰海水混合的淡水影响区（ROFI）控制，12月至2月营养物浓度与盐度呈较强的线性关系。春季和夏季浮游植物生物量最高的位置反映了受ROFI控制的养分分布。对7年数据的分析表明，冬季营养物浓度最大值在2月，4 / 5月下降的季节循环是该地区的一个周期性特征，每年下降的时间变化数周。利物浦湾观测到的营养物浓度与从河流输入预测的营养物浓度进行了比较。流入利物浦湾的河流中的营养物质浓度变化很大，使用本研究数据预测的淡水营养物质浓度与基于河流流量加权的河流营养物质浓度之间存在合理的一致性，尽管无法确定河流之间混合的确切性质。预测爱尔兰海冬季的营养物质浓度低于北大西洋输入水域的报告，这支持了先前研究的发现，即爱尔兰海的氮通过反硝化而损失。
This paper presents data for the temporal and spatial distribution of nutrients in Liverpool Bay between 2003 and 2009 and an analysis of inputs of nutrients from the major rivers. The spatial distribution of winter nutrient concentrations are controlled by the region of freshwater influence (ROFI) in Liverpool Bay through the mixing of riverine freshwater and Irish Sea water, with strong linear relationships between nutrient concentration and salinity between December and February. The location of highest spring and summer phytoplankton biomass reflects the nutrient distributions as controlled by the ROFI. Analysis of 7 years of data showed that the seasonal cycle of winter maximum nutrient concentrations in February and drawdown in April/May is a recurrent feature of this location, with the timing of the drawdown varying by several weeks between years. A comparison of observed nutrient concentrations in Liverpool Bay with those predicted from inputs from rivers has been presented. Nutrient concentrations in the rivers flowing into Liverpool Bay were highly variable and there was reasonable agreement between predicted freshwater nutrient concentrations using data from this study and riverine nutrient concentrations weighted on the basis of river flow, although the exact nature of mixing between the rivers could not be determined. Predicted Irish Sea nutrient concentrations in the winter were lower than those reported for the input waters of the North Atlantic, supporting findings from previous work that nitrogen is lost through denitrification in the Irish Sea.