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首页> 外文期刊>Journal of oceanography >Temporal Variations in the Dissolved Nutrient Stocks in the Surface Water of the Western North Atlantic Ocean
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Temporal Variations in the Dissolved Nutrient Stocks in the Surface Water of the Western North Atlantic Ocean

机译：北大西洋西部地表水溶解性养分库的时间变化

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摘要

Changes in patterns of undetectability and molar ratios of dissolved nutrients in the euphotic zone of the oligotrophic western North Atlantic Ocean were investigated utilizing the Bermuda Atlantic Time-series Study (BATS) data set of the US Joint Global Ocean Flux Study (JGOFS). Our aim was to examine the temporal dynamics of nutrient stocks over a decade (1989～1998) and to gain insight into the interactions between the different biotic and abiotic factors underlying BATS. Patterns of nutrient undetectability clearly revealed the depleted nature of the nutrients in surface water at the BATS location, particularly phosphorous. The N:P ratio was consistently far above the nominal Redfield ratio (mean, 38.5) but was significantly lower during the 1993～1994 period (22.1). Over the same period the proportion of samples depleted in N only increased while the proportion of samples depleted in P only decreased. This indicates an overall reduction of N relative to P in the surface water at BATS during the 1993～1994 period, the reasons for this anomaly, though, are not clear. The correlation analysis between the biotic and abiotic variables at BATS has indicated some interesting relationships that can help understand some of the parameters affecting nutrient stocks in the euphotic zone and their consequent impacts on marine biota. Although nutrient stocks in the oligotrophic environment are limited, they might be subject to interannual variation that may become anomalous in some cases. These variations might underlay significant feedback mechanisms by affecting marine productivity, the prime factor controlling the sequestration of atmospheric CO_2 by the oceans.
机译：利用美国联合全球海洋通量研究（JGOFS）的百慕大大西洋时间序列研究（BATS）数据集，研究了贫营养型北大西洋富营养化地区北大西洋富营养区的不可检测模式和溶解营养物摩尔比的变化。我们的目的是研究营养素库在过去十年（1989〜1998）中的时间动态，并深入了解BATS中不同的生物和非生物因素之间的相互作用。养分无法检测的模式清楚地表明，BATS位置的地表水中养分特别是磷的消耗性。 N：P比率始终远高于名义Redfield比率（平均值38.5），但在1993〜1994年期间则显着降低（22.1）。在同一时期，仅N的样品比例增加，而仅P的样品比例减少。这表明在1993〜1994年期间，BATS地表水中N相对于P的总体减少，但这种异常的原因尚不清楚。在BATS的生物和非生物变量之间的相关分析表明，一些有趣的关系可以帮助理解影响富营养区养分储量的某些参数及其对海洋生物区系的影响。尽管贫营养环境中的养分储备有限，但它们可能会发生年际变化，在某些情况下可能会变得异常。这些变化可能会通过影响海洋生产力而成为重要的反馈机制，海洋生产力是控制海洋隔离大气中CO_2的主要因素。

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