The seasonal cycles of temperature, salinity, nutrients and suspended sediment in the southern North Sea in 1988 and 1989
The seasonal cycles of temperature, salinity, nutrients and suspended sediment in the southern North Sea in 1988 and 1989
复制标题
1988年和1989年北海南部温度、盐度、营养盐和悬浮沉积物的季节变化
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
J. McManus
中科院分区：
文献类型：
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作者：
D. Prandle;D. Hydes;J. Jarvis;J. McManus
摘要利用英国连续15次月度调查的大量数据，进行简单的统计分析。北海项目。温度、盐度、磷酸盐、硝酸盐、亚硝酸盐、硅酸盐、铵和悬浮颗粒物（SPM）的季节循环近似为平均值加一年的余弦波。在15个月期间，涵盖整个地区的每一项水质参数的平均浓度（括号内为标准差c）为：盐度34.26（± 0.74）μ M，氨氮1.3（± 1.0）μ M，硝酸盐4.9（± 6.0）μ M，亚硝酸盐0.4（± 0.5）μ M，磷酸盐0.5（± 0.3）μ M，硅酸盐2.5（± 2.5）μM，悬浮泥沙2.6（± 3.5）mg l −1。这种近似的季节循环解释了温度和营养物质的大部分变化。硝酸盐和硅酸盐的空间平均季节振幅约等于他们的平均值，这是一致的，这些限制营养素。盐度显示出很少的季节性。空间分布显示的平均值，季节幅度和百分比的变化占这些平均值和季节幅度的组合。测定之间的相关性进行计算，这些确认的营养物质，特别是硝酸盐，磷酸盐和硅酸盐之间的空间分布的相似性。最高浓度仅限于沿海地区，但铵和亚硝酸盐除外，它们发生在近海。空间分布的异常（非季节性）组件可以解释为特定的河流和海洋交换的影响。硝酸盐、亚硝酸盐和铵之间的相关性对应于这些化合物的相互转化。磷酸盐，硝酸盐和硅酸盐的海洋/河流流入率被证明是不足以支持其季节性变化，这表明内部循环是必要的，以维持季节性循环。
Abstract Simple statistical analyses are used to summarize the large data set available from the 15 consecutive monthly surveys of the U.K. North Sea Project (NSP). The seasonal cycles of temperature, salinity, phosphate, nitrate, nitrite, silicate, ammonium and suspended particulate matter (SPM) are approximated by a mean value plus a year-long cosine wave. The mean concentrations, with standard deviation c given in parentheses, for each of these water quality parameters covering the whole area throughout the 15-month period are: salinity 34·26 (±0·74), ammonia 1·3 (±1·0) μ M, nitrate 4·9 (±6·0) μ M, nitrite 0·4 (±0·5) μ M, phosphate 0·5 (0·3) μ M, silicate 2·5 (±2·5) μM and suspended sediment 2·6 (±3·5) mg l −1 . This approximate seasonal cycle accounts for most of the variance in temperature and nutrients. The spatially-averaged seasonal amplitudes for both nitrate and silicate are approximately equal to their mean values—this is consistent with these being limiting nutrients. Salinity shows little seasonality. Spatial distributions are shown of the mean values, the seasonal amplitudes and the percentage variances accounted for by a combination of these mean values and seasonal amplitudes. Correlations between the determinands are calculated; these confirm the similarity in the spatial distributions for the nutrients, especially between nitrate, phosphate and silicate. Maximum concentrations are confined to the coastal regions, except for ammonium and nitrite for which they occur offshore. Spatial distributions of the anomalous (non-seasonal) components can be interpreted to indicate the effect of specific riverine and oceanic exchanges. Correlations between nitrate, nitrite and ammonium correspond to the interconversion of these compounds. The oceanic/riverine inflow rates of phosphate, nitrate and silicate are shown to be insufficient to support their seasonal variability, suggesting that internal recycling is required to maintain the seasonal cycle.