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首页> 外文期刊>Marine Chemistry >Determination of water mass ages using radium isotopes as tracers: Implications for phytoplankton dynamics in estuaries
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Determination of water mass ages using radium isotopes as tracers: Implications for phytoplankton dynamics in estuaries

机译：使用镭同位素作为示踪剂确定水的质量年龄：对河口浮游植物动力学的影响

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Despite a relatively short residence time of water in many shallow, semi-enclosed estuaries, phytoplankton blooms in nutrient enriched systems are a common phenomenon. This poses the question how is it possible to have phytoplankton populations bloom in response to local conditions of shallow estuaries, if the water residence times are similar to cell division times? To address this paradox we used the radium quartet as a tool to measure water mass age in coastal systems (Waquoit Bay, MA, USA) subject to different degrees of land-derived nitrogen load and hence differences in phytoplankton biomass. Recently, the radium quartet has been used as geochemical tracers to determine age of water masses. Based on a number of samples collected over the course of one year, the average radium-derived age (± stdev) of water in three sub-estuaries of Waquoit Bay (Childs River, Quashnet River, and Sage Lot Pond) was -7 (±4.7), 11 (±6.2), and 17 (±7.5) days, respectively. These values are significantly longer than previous estimates based on more traditional hydrodynamic methods. Furthermore, peak chlorophyll concentrations were associated with older water masses in the heavily freshwater-influenced sub-estuaries (Childs and Quashnet). Our results suggest that water age, temperature, and nutrients all play a role in controlling phytoplankton biomass however, water age was more important at the time of the year when temperature limits phytoplankton growth (late spring, early summer). We conclude that radium-derived age models, which are similar to artificial tracer-based approaches, may be the most appropriate method for studying the role of hydrodynamics on estuarine ecology.
机译：尽管在许多浅的，半封闭的河口中水的停留时间相对较短，但在营养丰富的系统中浮游植物开花却是常见现象。这就提出了一个问题，如果水的停留时间与细胞分裂时间相似，浮游植物种群如何响应浅河口的当地条件而开花？为了解决这一矛盾，我们使用镭四重奏作为测量沿海系统（Waquoit湾，马萨诸塞州，美国）中水质年龄的工具，这些水质年龄受到不同程度的土地衍生氮负荷，从而导致浮游植物生物量的差异。最近，镭四重奏已用作地球化学示踪剂，以确定水团的年龄。根据一年中收集的大量样本，Waquoit湾三个子河口（Childs河，Quashnet河和Sage Lot池塘）的水平均镭衍生年龄（±stdev）为-7（ ±4.7），11（±6.2）和17（±7.5）天。这些值比以前基于更传统的流体动力学方法的估计值要长得多。此外，在受淡水影响严重的子河口（Childs和Quashnet）中，叶绿素峰值浓度与较老的水团有关。我们的结果表明，水龄，温度和养分都在控制浮游生物量中发挥作用，但是，在温度限制浮游植物生长的一年中的春季（春季，初夏），水龄更为重要。我们得出的结论是，与基于人工示踪剂的方法相似的镭衍生年龄模型可能是研究流体动力学在河口生态系统中作用的最合适方法。

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