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Utility of an automatic water sampler to observe seasonal variability in nutrients and DIC in the Northwestern North Pacific

机译：实用的自动水采样器，用于观测西北太平洋西北部养分和DIC的季节性变化

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Concentrations of nutrients (NO3, NO2, Si(OH)4, PO4 and dissolved inorganic carbon (DIC) were measured in a series of seawater samples collected over approximately 15 months in 2005 and 2006 by an automatic water sampler (Remote Access Sampler, RAS) in the Northwestern North Pacific. Seasonal variability and concentrations of NO3 + NO2 (NOx and Si(OH)4 were comparable to previous shipboard observations, although there were small errors associated with measurements of PO4 and DIC. Concentrations of these nutrients began to decrease in late April. After the end of June, NOx and Si(OH)4 decreased rapidly, with large fluctuations. After October, these nutrients increased again until late spring 2006. The ratio of the decrease of Si(OH)4 to that of NOx suggests that numbers of biogenic opal-producing creatures, such as diatoms, increased after the end of June. This conclusion was supported by a rapid increase in biogenic opal flux recorded in a sediment trap at 150 m. The relationship between NOx concentrations at the RAS depth of 35 m and NOx integrated over the upper 100 m was determined using previous shipboard hydrocast data. This relationship was used to estimate integrated mixed layer NOx concentration from RAS data. Estimated new production based on seasonal drawdown of integrated NOx averaged approximately 156 mg-C m?2day?1 annually, which agrees with previous estimates. Thus, an automatic seawater sampler that documents annual maximum and minimum nutrient concentrations and episodic events such as storms and spring blooms, which might be missed by an ordinary research vessel, will contribute to time-series observations of nutrients and, by extension, biological pump activity.
机译：在2005年和2006年通过自动水采样器（Remote Access Sampler，RAS）在大约15个月内收集的一系列海水样本中测量了营养物（NO3，NO2，Si（OH）4，PO4和溶解的无机碳（DIC））的浓度在北太平洋西北部），NO3 + NO2（NOx和Si（OH）4）的季节变化和浓度与以前的船上观测值相当，尽管与PO4和DIC的测量存在微小误差，但这些营养物的浓度开始下降在4月下旬，6月底之后，NOx和Si（OH）4迅速减少，并有较大的波动;在10月之后，这些养分再次增加，直到2006年春末。 NOx表明，6月底以后硅藻等生物蛋白石生产生物的数量有所增加，这一结论得到了沉积物捕集器150 m处记录的生物蛋白石通量的快速增加的支持。使用先前的船上水铸数据确定在35 m RAS深度处的NOx浓度和在100 m上方累积的NOx。该关系用于根据RAS数据估算混合层的综合NOx浓度。根据季节性NOx排放量估算的新产量平均约为每年156 mg-C m？2day？1，与先前的估算相符。因此，一个普通的研究船可能会遗漏的，能记录年度最大和最小养分浓度以及诸如暴风雨和春花之类的突发事件的自动海水采样器，将有助于对养分进行时间序列观测，并扩展到生物泵。活动。

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